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[SOURCE: https://en.wikipedia.org/wiki/Black_hole#cite_note-PRL-20160211-59] | [TOKENS: 13839] |
Contents Black hole A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole. The boundary of no escape is called the event horizon. In general relativity, a black hole's event horizon seals an object's fate but produces no locally detectable change when crossed. General relativity also predicts that every black hole should have a central singularity, where the curvature of spacetime is infinite. In many ways, a black hole acts like an ideal black body, as it reflects no light. Quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly. Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. In 1916, Karl Schwarzschild found the first modern solution of general relativity that would characterise a black hole. Due to his influential research, the Schwarzschild metric is named after him. David Finkelstein, in 1958, first interpreted Schwarzschild's model as a region of space from which nothing can escape. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The first black hole known was Cygnus X-1, identified by several researchers independently in 1971. Black holes typically form when massive stars collapse at the end of their life cycle. After a black hole has formed, it can grow by absorbing mass from its surroundings. Supermassive black holes of millions of solar masses may form by absorbing other stars and merging with other black holes, or via direct collapse of gas clouds. There is consensus that supermassive black holes exist in the centres of most galaxies. The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter falling toward a black hole can form an accretion disk of infalling plasma, heated by friction and emitting light. In extreme cases, this creates a quasar, some of the brightest objects in the universe. Merging black holes can also be detected by observation of the gravitational waves they emit. If other stars are orbiting a black hole, their orbits can be used to determine the black hole's mass and location. Such observations can be used to exclude possible alternatives such as neutron stars. In this way, astronomers have identified numerous stellar black hole candidates in binary systems and established that the radio source known as Sagittarius A*, at the core of the Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses. History The idea of a body so massive that even light could not escape was first proposed in the late 18th century by English astronomer and clergyman John Michell and independently by French scientist Pierre-Simon Laplace. Both scholars proposed very large stars in contrast to the modern concept of an extremely dense object. Michell's idea, in a short part of a letter published in 1784, calculated that a star with the same density but 500 times the radius of the sun would not let any emitted light escape; the surface escape velocity would exceed the speed of light.: 122 Michell correctly hypothesized that such supermassive but non-radiating bodies might be detectable through their gravitational effects on nearby visible bodies. In 1796, Laplace mentioned that a star could be invisible if it were sufficiently large while speculating on the origin of the Solar System in his book Exposition du Système du Monde. Franz Xaver von Zach asked Laplace for a mathematical analysis, which Laplace provided and published in a journal edited by von Zach. In 1905, Albert Einstein showed that the laws of electromagnetism would be invariant under a Lorentz transformation: they would be identical for observers travelling at different velocities relative to each other. This discovery became known as the principle of special relativity. Although the laws of mechanics had already been shown to be invariant, gravity remained yet to be included.: 19 In 1907, Einstein published a paper proposing his equivalence principle, the hypothesis that inertial mass and gravitational mass have a common cause. Using the principle, Einstein predicted the redshift and half of the lensing effect of gravity on light; the full prediction of gravitational lensing required development of general relativity.: 19 By 1915, Einstein refined these ideas into his general theory of relativity, which explained how matter affects spacetime, which in turn affects the motion of other matter. This formed the basis for black hole physics. Only a few months after Einstein published the field equations describing general relativity, astrophysicist Karl Schwarzschild set out to apply the idea to stars. He assumed spherical symmetry with no spin and found a solution to Einstein's equations.: 124 A few months after Schwarzschild, Johannes Droste, a student of Hendrik Lorentz, independently gave the same solution. At a certain radius from the center of the mass, the Schwarzschild solution became singular, meaning that some of the terms in the Einstein equations became infinite. The nature of this radius, which later became known as the Schwarzschild radius, was not understood at the time. Many physicists of the early 20th century were skeptical of the existence of black holes. In a 1926 popular science book, Arthur Eddington critiqued the idea of a star with mass compressed to its Schwarzschild radius as a flaw in the then-poorly-understood theory of general relativity.: 134 In 1939, Einstein himself used his theory of general relativity in an attempt to prove that black holes were impossible. His work relied on increasing pressure or increasing centrifugal force balancing the force of gravity so that the object would not collapse beyond its Schwarzschild radius. He missed the possibility that implosion would drive the system below this critical value.: 135 By the 1920s, astronomers had classified a number of white dwarf stars as too cool and dense to be explained by the gradual cooling of ordinary stars. In 1926, Ralph Fowler showed that quantum-mechanical degeneracy pressure was larger than thermal pressure at these densities.: 145 In 1931, Subrahmanyan Chandrasekhar calculated that a non-rotating body of electron-degenerate matter below a certain limiting mass is stable, and by 1934 he showed that this explained the catalog of white dwarf stars.: 151 When Chandrasekhar announced his results, Eddington pointed out that stars above this limit would radiate until they were sufficiently dense to prevent light from exiting, a conclusion he considered absurd. Eddington and, later, Lev Landau argued that some yet unknown mechanism would stop the collapse. In the 1930s, Fritz Zwicky and Walter Baade studied stellar novae, focusing on exceptionally bright ones they called supernovae. Zwicky promoted the idea that supernovae produced stars with the density of atomic nuclei—neutron stars—but this idea was largely ignored.: 171 In 1939, based on Chandrasekhar's reasoning, J. Robert Oppenheimer and George Volkoff predicted that neutron stars below a certain mass limit, later called the Tolman–Oppenheimer–Volkoff limit, would be stable due to neutron degeneracy pressure. Above that limit, they reasoned that either their model would not apply or that gravitational contraction would not stop.: 380 John Archibald Wheeler and two of his students resolved questions about the model behind the Tolman–Oppenheimer–Volkoff (TOV) limit. Harrison and Wheeler developed the equations of state relating density to pressure for cold matter all the way through electron degeneracy and neutron degeneracy. Masami Wakano and Wheeler then used the equations to compute the equilibrium curve for stars, relating mass to circumference. They found no additional features that would invalidate the TOV limit. This meant that the only thing that could prevent black holes from forming was a dynamic process ejecting sufficient mass from a star as it cooled.: 205 The modern concept of black holes was formulated by Robert Oppenheimer and his student Hartland Snyder in 1939.: 80 In the paper, Oppenheimer and Snyder solved Einstein's equations of general relativity for an idealized imploding star, in a model later called the Oppenheimer–Snyder model, then described the results from far outside the star. The implosion starts as one might expect: the star material rapidly collapses inward. However, as the density of the star increases, gravitational time dilation increases and the collapse, viewed from afar, seems to slow down further and further until the star reaches its Schwarzschild radius, where it appears frozen in time.: 217 In 1958, David Finkelstein identified the Schwarzschild surface as an event horizon, calling it "a perfect unidirectional membrane: causal influences can cross it in only one direction". In this sense, events that occur inside of the black hole cannot affect events that occur outside of the black hole. Finkelstein created a new reference frame to include the point of view of infalling observers.: 103 Finkelstein's new frame of reference allowed events at the surface of an imploding star to be related to events far away. By 1962 the two points of view were reconciled, convincing many skeptics that implosion into a black hole made physical sense.: 226 The era from the mid-1960s to the mid-1970s was the "golden age of black hole research", when general relativity and black holes became mainstream subjects of research.: 258 In this period, more general black hole solutions were found. In 1963, Roy Kerr found the exact solution for a rotating black hole. Two years later, Ezra Newman found the cylindrically symmetric solution for a black hole that is both rotating and electrically charged. In 1967, Werner Israel found that the Schwarzschild solution was the only possible solution for a nonspinning, uncharged black hole, meaning that a Schwarzschild black hole would be defined by its mass alone. Similar identities were later found for Reissner-Nordstrom and Kerr black holes, defined only by their mass and their charge or spin respectively. Together, these findings became known as the no-hair theorem, which states that a stationary black hole is completely described by the three parameters of the Kerr–Newman metric: mass, angular momentum, and electric charge. At first, it was suspected that the strange mathematical singularities found in each of the black hole solutions only appeared due to the assumption that a black hole would be perfectly spherically symmetric, and therefore the singularities would not appear in generic situations where black holes would not necessarily be symmetric. This view was held in particular by Vladimir Belinski, Isaak Khalatnikov, and Evgeny Lifshitz, who tried to prove that no singularities appear in generic solutions, although they would later reverse their positions. However, in 1965, Roger Penrose proved that general relativity without quantum mechanics requires that singularities appear in all black holes. Astronomical observations also made great strides during this era. In 1967, Antony Hewish and Jocelyn Bell Burnell discovered pulsars and by 1969, these were shown to be rapidly rotating neutron stars. Until that time, neutron stars, like black holes, were regarded as just theoretical curiosities, but the discovery of pulsars showed their physical relevance and spurred a further interest in all types of compact objects that might be formed by gravitational collapse. Based on observations in Greenwich and Toronto in the early 1970s, Cygnus X-1, a galactic X-ray source discovered in 1964, became the first astronomical object commonly accepted to be a black hole. Work by James Bardeen, Jacob Bekenstein, Carter, and Hawking in the early 1970s led to the formulation of black hole thermodynamics. These laws describe the behaviour of a black hole in close analogy to the laws of thermodynamics by relating mass to energy, area to entropy, and surface gravity to temperature. The analogy was completed: 442 when Hawking, in 1974, showed that quantum field theory implies that black holes should radiate like a black body with a temperature proportional to the surface gravity of the black hole, predicting the effect now known as Hawking radiation. While Cygnus X-1, a stellar-mass black hole, was generally accepted by the scientific community as a black hole by the end of 1973, it would be decades before a supermassive black hole would gain the same broad recognition. Although, as early as the 1960s, physicists such as Donald Lynden-Bell and Martin Rees had suggested that powerful quasars in the center of galaxies were powered by accreting supermassive black holes, little observational proof existed at the time. However, the Hubble Space Telescope, launched decades later, found that supermassive black holes were not only present in these active galactic nuclei, but that supermassive black holes in the center of galaxies were ubiquitous: Almost every galaxy had a supermassive black hole at its center, many of which were quiescent. In 1999, David Merritt proposed the M–sigma relation, which related the dispersion of the velocity of matter in the center bulge of a galaxy to the mass of the supermassive black hole at its core. Subsequent studies confirmed this correlation. Around the same time, based on telescope observations of the velocities of stars at the center of the Milky Way galaxy, independent work groups led by Andrea Ghez and Reinhard Genzel concluded that the compact radio source in the center of the galaxy, Sagittarius A*, was likely a supermassive black hole. On 11 February 2016, the LIGO Scientific Collaboration and Virgo Collaboration announced the first direct detection of gravitational waves, named GW150914, representing the first observation of a black hole merger. At the time of the merger, the black holes were approximately 1.4 billion light-years away from Earth and had masses of 30 and 35 solar masses.: 6 In 2017, Rainer Weiss, Kip Thorne, and Barry Barish, who had spearheaded the project, were awarded the Nobel Prize in Physics for their work. Since the initial discovery in 2015, hundreds more gravitational waves have been observed by LIGO and another interferometer, Virgo. On 10 April 2019, the first direct image of a black hole and its vicinity was published, following observations made by the Event Horizon Telescope (EHT) in 2017 of the supermassive black hole in Messier 87's galactic centre. In 2022, the Event Horizon Telescope collaboration released an image of the black hole in the center of the Milky Way galaxy, Sagittarius A*; The data had been collected in 2017. In 2020, the Nobel Prize in Physics was awarded for work on black holes. Andrea Ghez and Reinhard Genzel shared one-half for their discovery that Sagittarius A* is a supermassive black hole. Penrose received the other half for his work showing that the mathematics of general relativity requires the formation of black holes. Cosmologists lamented that Hawking's extensive theoretical work on black holes would not be honored since he died in 2018. In December 1967, a student reportedly suggested the phrase black hole at a lecture by John Wheeler; Wheeler adopted the term for its brevity and "advertising value", and Wheeler's stature in the field ensured it quickly caught on, leading some to credit Wheeler with coining the phrase. However, the term was used by others around that time. Science writer Marcia Bartusiak traces the term black hole to physicist Robert H. Dicke, who in the early 1960s reportedly compared the phenomenon to the Black Hole of Calcutta, notorious as a prison where people entered but never left alive. The term was used in print by Life and Science News magazines in 1963, and by science journalist Ann Ewing in her article "'Black Holes' in Space", dated 18 January 1964, which was a report on a meeting of the American Association for the Advancement of Science held in Cleveland, Ohio. Definition A black hole is generally defined as a region of spacetime from which no information-carrying signals or objects can escape. However, verifying an object as a black hole by this definition would require waiting for an infinite time and at an infinite distance from the black hole to verify that indeed, nothing has escaped, and thus cannot be used to identify a physical black hole. Broadly, physicists do not have a precisely-agreed-upon definition of a black hole. Among astrophysicists, a black hole is a compact object with a mass larger than four solar masses. A black hole may also be defined as a reservoir of information: 142 or a region where space is falling inwards faster than the speed of light. Properties The no-hair theorem postulates that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, electric charge, and angular momentum; the black hole is otherwise featureless. If the conjecture is true, any two black holes that share the same values for these properties, or parameters, are indistinguishable from one another. The degree to which the conjecture is true for real black holes is currently an unsolved problem. The simplest static black holes have mass but neither electric charge nor angular momentum. According to Birkhoff's theorem, these Schwarzschild black holes are the only vacuum solution that is spherically symmetric. Solutions describing more general black holes also exist. Non-rotating charged black holes are described by the Reissner–Nordström metric, while the Kerr metric describes a non-charged rotating black hole. The most general stationary black hole solution known is the Kerr–Newman metric, which describes a black hole with both charge and angular momentum. The simplest static black holes have mass but neither electric charge nor angular momentum. Contrary to the popular notion of a black hole "sucking in everything" in its surroundings, from far away, the external gravitational field of a black hole is identical to that of any other body of the same mass. While a black hole can theoretically have any positive mass, the charge and angular momentum are constrained by the mass. The total electric charge Q and the total angular momentum J are expected to satisfy the inequality Q 2 4 π ϵ 0 + c 2 J 2 G M 2 ≤ G M 2 {\displaystyle {\frac {Q^{2}}{4\pi \epsilon _{0}}}+{\frac {c^{2}J^{2}}{GM^{2}}}\leq GM^{2}} for a black hole of mass M. Black holes with the maximum possible charge or spin satisfying this inequality are called extremal black holes. Solutions of Einstein's equations that violate this inequality exist, but they do not possess an event horizon. These are so-called naked singularities that can be observed from the outside. Because these singularities make the universe inherently unpredictable, many physicists believe they could not exist. The weak cosmic censorship hypothesis, proposed by Sir Roger Penrose, rules out the formation of such singularities, when they are created through the gravitational collapse of realistic matter. However, this theory has not yet been proven, and some physicists believe that naked singularities could exist. It is also unknown whether black holes could even become extremal, forming naked singularities, since natural processes counteract increasing spin and charge when a black hole becomes near-extremal. The total mass of a black hole can be estimated by analyzing the motion of objects near the black hole, such as stars or gas. All black holes spin, often fast—One supermassive black hole, GRS 1915+105 has been estimated to spin at over 1,000 revolutions per second. The Milky Way's central black hole Sagittarius A* rotates at about 90% of the maximum rate. The spin rate can be inferred from measurements of atomic spectral lines in the X-ray range. As gas near the black hole plunges inward, high energy X-ray emission from electron-positron pairs illuminates the gas further out, appearing red-shifted due to relativistic effects. Depending on the spin of the black hole, this plunge happens at different radii from the hole, with different degrees of redshift. Astronomers can use the gap between the x-ray emission of the outer disk and the redshifted emission from plunging material to determine the spin of the black hole. A newer way to estimate spin is based on the temperature of gasses accreting onto the black hole. The method requires an independent measurement of the black hole mass and inclination angle of the accretion disk followed by computer modeling. Gravitational waves from coalescing binary black holes can also provide the spin of both progenitor black holes and the merged hole, but such events are rare. A spinning black hole has angular momentum. The supermassive black hole in the center of the Messier 87 (M87) galaxy appears to have an angular momentum very close to the maximum theoretical value. That uncharged limit is J ≤ G M 2 c , {\displaystyle J\leq {\frac {GM^{2}}{c}},} allowing definition of a dimensionless spin magnitude such that 0 ≤ c J G M 2 ≤ 1. {\displaystyle 0\leq {\frac {cJ}{GM^{2}}}\leq 1.} Most black holes are believed to have an approximately neutral charge. For example, Michal Zajaček, Arman Tursunov, Andreas Eckart, and Silke Britzen found the electric charge of Sagittarius A* to be at least ten orders of magnitude below the theoretical maximum. A charged black hole repels other like charges just like any other charged object. If a black hole were to become charged, particles with an opposite sign of charge would be pulled in by the extra electromagnetic force, while particles with the same sign of charge would be repelled, neutralizing the black hole. This effect may not be as strong if the black hole is also spinning. The presence of charge can reduce the diameter of the black hole by up to 38%. The charge Q for a nonspinning black hole is bounded by Q ≤ G M , {\displaystyle Q\leq {\sqrt {G}}M,} where G is the gravitational constant and M is the black hole's mass. Classification Black holes can have a wide range of masses. The minimum mass of a black hole formed by stellar gravitational collapse is governed by the maximum mass of a neutron star and is believed to be approximately two-to-four solar masses. However, theoretical primordial black holes, believed to have formed soon after the Big Bang, could be far smaller, with masses as little as 10−5 grams at formation. These very small black holes are sometimes called micro black holes. Black holes formed by stellar collapse are called stellar black holes. Estimates of their maximum mass at formation vary, but generally range from 10 to 100 solar masses, with higher estimates for black holes progenated by low-metallicity stars. The mass of a black hole formed via a supernova has a lower bound: If the progenitor star is too small, the collapse may be stopped by the degeneracy pressure of the star's constituents, allowing the condensation of matter into an exotic denser state. Degeneracy pressure occurs from the Pauli exclusion principle—Particles will resist being in the same place as each other. Smaller progenitor stars, with masses less than about 8 M☉, will be held together by the degeneracy pressure of electrons and will become a white dwarf. For more massive progenitor stars, electron degeneracy pressure is no longer strong enough to resist the force of gravity and the star will be held together by neutron degeneracy pressure, which can occur at much higher densities, forming a neutron star. If the star is still too massive, even neutron degeneracy pressure will not be able to resist the force of gravity and the star will collapse into a black hole.: 5.8 Stellar black holes can also gain mass via accretion of nearby matter, often from a companion object such as a star. Black holes that are larger than stellar black holes but smaller than supermassive black holes are called intermediate-mass black holes, with masses of approximately 102 to 105 solar masses. These black holes seem to be rarer than their stellar and supermassive counterparts, with relatively few candidates having been observed. Physicists have speculated that such black holes may form from collisions in globular and star clusters or at the center of low-mass galaxies. They may also form as the result of mergers of smaller black holes, with several LIGO observations finding merged black holes within the 110-350 solar mass range. The black holes with the largest masses are called supermassive black holes, with masses more than 106 times that of the Sun. These black holes are believed to exist at the centers of almost every large galaxy, including the Milky Way. Some scientists have proposed a subcategory of even larger black holes, called ultramassive black holes, with masses greater than 109-1010 solar masses. Theoretical models predict that the accretion disc that feeds black holes will be unstable once a black hole reaches 50-100 billion times the mass of the Sun, setting a rough upper limit to black hole mass. Structure While black holes are conceptually invisible sinks of all matter and light, in astronomical settings, their enormous gravity alters the motion of surrounding objects and pulls nearby gas inwards at near-light speed, making the area around black holes the brightest objects in the universe. Some black holes have relativistic jets—thin streams of plasma travelling away from the black hole at more than one-tenth of the speed of light. A small faction of the matter falling towards the black hole gets accelerated away along the hole rotation axis. These jets can extend as far as millions of parsecs from the black hole itself. Black holes of any mass can have jets. However, they are typically observed around spinning black holes with strongly-magnetized accretion disks. Relativistic jets were more common in the early universe, when galaxies and their corresponding supermassive black holes were rapidly gaining mass. All black holes with jets also have an accretion disk, but the jets are usually brighter than the disk. Quasars, typically found in other galaxies, are believed to be supermassive black holes with jets; microquasars are believed to be stellar-mass objects with jets, typically observed in the Milky Way. The mechanism of formation of jets is not yet known, but several options have been proposed. One method proposed to fuel these jets is the Blandford-Znajek process, which suggests that the dragging of magnetic field lines by a black hole's rotation could launch jets of matter into space. The Penrose process, which involves extraction of a black hole's rotational energy, has also been proposed as a potential mechanism of jet propulsion. Due to conservation of angular momentum, gas falling into the gravitational well created by a massive object will typically form a disk-like structure around the object.: 242 As the disk's angular momentum is transferred outward due to internal processes, its matter falls farther inward, converting its gravitational energy into heat and releasing a large flux of x-rays. The temperature of these disks can range from thousands to millions of Kelvin, and temperatures can differ throughout a single accretion disk. Accretion disks can also emit in other parts of the electromagnetic spectrum, depending on the disk's turbulence and magnetization and the black hole's mass and angular momentum. Accretion disks can be defined as geometrically thin or geometrically thick. Geometrically thin disks are mostly confined to the black hole's equatorial plane and have a well-defined edge at the innermost stable circular orbit (ISCO), while geometrically thick disks are supported by internal pressure and temperature and can extend inside the ISCO. Disks with high rates of electron scattering and absorption, appearing bright and opaque, are called optically thick; optically thin disks are more translucent and produce fainter images when viewed from afar. Accretion disks of black holes accreting beyond the Eddington limit are often referred to as polish donuts due to their thick, toroidal shape that resembles that of a donut. Quasar accretion disks are expected to usually appear blue in color. The disk for a stellar black hole, on the other hand, would likely look orange, yellow, or red, with its inner regions being the brightest. Theoretical research suggests that the hotter a disk is, the bluer it should be, although this is not always supported by observations of real astronomical objects. Accretion disk colors may also be altered by the Doppler effect, with the part of the disk travelling towards an observer appearing bluer and brighter and the part of the disk travelling away from the observer appearing redder and dimmer. In Newtonian gravity, test particles can stably orbit at arbitrary distances from a central object. In general relativity, however, there exists a smallest possible radius for which a massive particle can orbit stably. Any infinitesimal inward perturbations to this orbit will lead to the particle spiraling into the black hole, and any outward perturbations will, depending on the energy, cause the particle to spiral in, move to a stable orbit further from the black hole, or escape to infinity. This orbit is called the innermost stable circular orbit, or ISCO. The location of the ISCO depends on the spin of the black hole and the spin of the particle itself. In the case of a Schwarzschild black hole (spin zero) and a particle without spin, the location of the ISCO is: r I S C O = 3 r s = 6 G M c 2 , {\displaystyle r_{\rm {ISCO}}=3\,r_{\text{s}}={\frac {6\,GM}{c^{2}}},} where r I S C O {\displaystyle r_{\rm {_{ISCO}}}} is the radius of the ISCO, r s {\displaystyle r_{\text{s}}} is the Schwarzschild radius of the black hole, G {\displaystyle G} is the gravitational constant, and c {\displaystyle c} is the speed of light. The radius of this orbit changes slightly based on particle spin. For charged black holes, the ISCO moves inwards. For spinning black holes, the ISCO is moved inwards for particles orbiting in the same direction that the black hole is spinning (prograde) and outwards for particles orbiting in the opposite direction (retrograde). For example, the ISCO for a particle orbiting retrograde can be as far out as about 9 r s {\displaystyle 9r_{\text{s}}} , while the ISCO for a particle orbiting prograde can be as close as at the event horizon itself. The photon sphere is a spherical boundary for which photons moving on tangents to that sphere are bent completely around the black hole, possibly orbiting multiple times. Light rays with impact parameters less than the radius of the photon sphere enter the black hole. For Schwarzschild black holes, the photon sphere has a radius 1.5 times the Schwarzschild radius; the radius for non-Schwarzschild black holes is at least 1.5 times the radius of the event horizon. When viewed from a great distance, the photon sphere creates an observable black hole shadow. Since no light emerges from within the black hole, this shadow is the limit for possible observations.: 152 The shadow of colliding black holes should have characteristic warped shapes, allowing scientists to detect black holes that are about to merge. While light can still escape from the photon sphere, any light that crosses the photon sphere on an inbound trajectory will be captured by the black hole. Therefore, any light that reaches an outside observer from the photon sphere must have been emitted by objects between the photon sphere and the event horizon. Light emitted towards the photon sphere may also curve around the black hole and return to the emitter. For a rotating, uncharged black hole, the radius of the photon sphere depends on the spin parameter and whether the photon is orbiting prograde or retrograde. For a photon orbiting prograde, the photon sphere will be 1-3 Schwarzschild radii from the center of the black hole, while for a photon orbiting retrograde, the photon sphere will be between 3-5 Schwarzschild radii from the center of the black hole. The exact location of the photon sphere depends on the magnitude of the black hole's rotation. For a charged, nonrotating black hole, there will only be one photon sphere, and the radius of the photon sphere will decrease for increasing black hole charge. For non-extremal, charged, rotating black holes, there will always be two photon spheres, with the exact radii depending on the parameters of the black hole. Near a rotating black hole, spacetime rotates similar to a vortex. The rotating spacetime will drag any matter and light into rotation around the spinning black hole. This effect of general relativity, called frame dragging, gets stronger closer to the spinning mass. The region of spacetime in which it is impossible to stay still is called the ergosphere. The ergosphere of a black hole is a volume bounded by the black hole's event horizon and the ergosurface, which coincides with the event horizon at the poles but bulges out from it around the equator. Matter and radiation can escape from the ergosphere. Through the Penrose process, objects can emerge from the ergosphere with more energy than they entered with. The extra energy is taken from the rotational energy of the black hole, slowing down the rotation of the black hole.: 268 A variation of the Penrose process in the presence of strong magnetic fields, the Blandford–Znajek process, is considered a likely mechanism for the enormous luminosity and relativistic jets of quasars and other active galactic nuclei. The observable region of spacetime around a black hole closest to its event horizon is called the plunging region. In this area it is no longer possible for free falling matter to follow circular orbits or stop a final descent into the black hole. Instead, it will rapidly plunge toward the black hole at close to the speed of light, growing increasingly hot and producing a characteristic, detectable thermal emission. However, light and radiation emitted from this region can still escape from the black hole's gravitational pull. For a nonspinning, uncharged black hole, the radius of the event horizon, or Schwarzschild radius, is proportional to the mass, M, through r s = 2 G M c 2 ≈ 2.95 M M ⊙ k m , {\displaystyle r_{\mathrm {s} }={\frac {2GM}{c^{2}}}\approx 2.95\,{\frac {M}{M_{\odot }}}~\mathrm {km,} } where rs is the Schwarzschild radius and M☉ is the mass of the Sun.: 124 For a black hole with nonzero spin or electric charge, the radius is smaller,[Note 1] until an extremal black hole could have an event horizon close to r + = G M c 2 , {\displaystyle r_{\mathrm {+} }={\frac {GM}{c^{2}}},} half the radius of a nonspinning, uncharged black hole of the same mass. Since the volume within the Schwarzschild radius increase with the cube of the radius, average density of a black hole inside its Schwarzschild radius is inversely proportional to the square of its mass: supermassive black holes are much less dense than stellar black holes. The average density of a 108 M☉ black hole is comparable to that of water. The defining feature of a black hole is the existence of an event horizon, a boundary in spacetime through which matter and light can pass only inward towards the center of the black hole. Nothing, not even light, can escape from inside the event horizon. The event horizon is referred to as such because if an event occurs within the boundary, information from that event cannot reach or affect an outside observer, making it impossible to determine whether such an event occurred.: 179 For non-rotating black holes, the geometry of the event horizon is precisely spherical, while for rotating black holes, the event horizon is oblate. To a distant observer, a clock near a black hole would appear to tick more slowly than one further from the black hole.: 217 This effect, known as gravitational time dilation, would also cause an object falling into a black hole to appear to slow as it approached the event horizon, never quite reaching the horizon from the perspective of an outside observer.: 218 All processes on this object would appear to slow down, and any light emitted by the object to appear redder and dimmer, an effect known as gravitational redshift. An object falling from half of a Schwarzschild radius above the event horizon would fade away until it could no longer be seen, disappearing from view within one hundredth of a second. It would also appear to flatten onto the black hole, joining all other material that had ever fallen into the hole. On the other hand, an observer falling into a black hole would not notice any of these effects as they cross the event horizon. Their own clocks appear to them to tick normally, and they cross the event horizon after a finite time without noting any singular behaviour. In general relativity, it is impossible to determine the location of the event horizon from local observations, due to Einstein's equivalence principle.: 222 Black holes that are rotating and/or charged have an inner horizon, often called the Cauchy horizon, inside of the black hole. The inner horizon is divided up into two segments: an ingoing section and an outgoing section. At the ingoing section of the Cauchy horizon, radiation and matter that fall into the black hole would build up at the horizon, causing the curvature of spacetime to go to infinity. This would cause an observer falling in to experience tidal forces. This phenomenon is often called mass inflation, since it is associated with a parameter dictating the black hole's internal mass growing exponentially, and the buildup of tidal forces is called the mass-inflation singularity or Cauchy horizon singularity. Some physicists have argued that in realistic black holes, accretion and Hawking radiation would stop mass inflation from occurring. At the outgoing section of the inner horizon, infalling radiation would backscatter off of the black hole's spacetime curvature and travel outward, building up at the outgoing Cauchy horizon. This would cause an infalling observer to experience a gravitational shock wave and tidal forces as the spacetime curvature at the horizon grew to infinity. This buildup of tidal forces is called the shock singularity. Both of these singularities are weak, meaning that an object crossing them would only be deformed a finite amount by tidal forces, even though the spacetime curvature would still be infinite at the singularity. This is as opposed to a strong singularity, where an object hitting the singularity would be stretched and squeezed by an infinite amount. They are also null singularities, meaning that a photon could travel parallel to the them without ever being intercepted. Ignoring quantum effects, every black hole has a singularity inside, points where the curvature of spacetime becomes infinite, and geodesics terminate within a finite proper time.: 205 For a non-rotating black hole, this region takes the shape of a single point; for a rotating black hole it is smeared out to form a ring singularity that lies in the plane of rotation.: 264 In both cases, the singular region has zero volume. All of the mass of the black hole ends up in the singularity.: 252 Since the singularity has nonzero mass in an infinitely small space, it can be thought of as having infinite density. Observers falling into a Schwarzschild black hole (i.e., non-rotating and not charged) cannot avoid being carried into the singularity once they cross the event horizon. As they fall further into the black hole, they will be torn apart by the growing tidal forces in a process sometimes referred to as spaghettification or the noodle effect. Eventually, they will reach the singularity and be crushed into an infinitely small point.: 182 However any perturbations, such as those caused by matter or radiation falling in, would cause space to oscillate chaotically near the singularity. Any matter falling in would experience intense tidal forces rapidly changing in direction, all while being compressed into an increasingly small volume. Alternative forms of general relativity, including addition of some quatum effects, can lead to regular, or nonsingular, black holes without singularities. For example, the fuzzball model, based on string theory, states that black holes are actually made up of quantum microstates and need not have a singularity or an event horizon. The theory of loop quantum gravity proposes that the curvature and density at the center of a black hole is large, but not infinite. Formation Black holes are formed by gravitational collapse of massive stars, either by direct collapse or during a supernova explosion in a process called fallback. Black holes can result from the merger of two neutron stars or a neutron star and a black hole. Other more speculative mechanisms include primordial black holes created from density fluctuations in the early universe, the collapse of dark stars, a hypothetical object powered by annihilation of dark matter, or from hypothetical self-interacting dark matter. Gravitational collapse occurs when an object's internal pressure is insufficient to resist the object's own gravity. At the end of a star's life, it will run out of hydrogen to fuse, and will start fusing more and more massive elements, until it gets to iron. Since the fusion of elements heavier than iron would require more energy than it would release, nuclear fusion ceases. If the iron core of the star is too massive, the star will no longer be able to support itself and will undergo gravitational collapse. While most of the energy released during gravitational collapse is emitted very quickly, an outside observer does not actually see the end of this process. Even though the collapse takes a finite amount of time from the reference frame of infalling matter, a distant observer would see the infalling material slow and halt just above the event horizon, due to gravitational time dilation. Light from the collapsing material takes longer and longer to reach the observer, with the delay growing to infinity as the emitting material reaches the event horizon. Thus the external observer never sees the formation of the event horizon; instead, the collapsing material seems to become dimmer and increasingly red-shifted, eventually fading away. Observations of quasars at redshift z ∼ 7 {\displaystyle z\sim 7} , less than a billion years after the Big Bang, has led to investigations of other ways to form black holes. The accretion process to build supermassive black holes has a limiting rate of mass accumulation and a billion years is not enough time to reach quasar status. One suggestion is direct collapse of nearly pure hydrogen gas (low metalicity) clouds characteristic of the young universe, forming a supermassive star which collapses into a black hole. It has been suggested that seed black holes with typical masses of ~105 M☉ could have formed in this way which then could grow to ~109 M☉. However, the very large amount of gas required for direct collapse is not typically stable to fragmentation to form multiple stars. Thus another approach suggests massive star formation followed by collisions that seed massive black holes which ultimately merge to create a quasar.: 85 A neutron star in a common envelope with a regular star can accrete sufficient material to collapse to a black hole or two neutron stars can merge. These avenues for the formation of black holes are considered relatively rare. In the current epoch of the universe, conditions needed to form black holes are rare and are mostly only found in stars. However, in the early universe, conditions may have allowed for black hole formations via other means. Fluctuations of spacetime soon after the Big Bang may have formed areas that were denser then their surroundings. Initially, these regions would not have been compact enough to form a black hole, but eventually, the curvature of spacetime in the regions become large enough to cause them to collapse into a black hole. Different models for the early universe vary widely in their predictions of the scale of these fluctuations. Various models predict the creation of primordial black holes ranging from a Planck mass (~2.2×10−8 kg) to hundreds of thousands of solar masses. Primordial black holes with masses less than 1015 g would have evaporated by now due to Hawking radiation. Despite the early universe being extremely dense, it did not re-collapse into a black hole during the Big Bang, since the universe was expanding rapidly and did not have the gravitational differential necessary for black hole formation. Models for the gravitational collapse of objects of relatively constant size, such as stars, do not necessarily apply in the same way to rapidly expanding space such as the Big Bang. In principle, black holes could be formed in high-energy particle collisions that achieve sufficient density, although no such events have been detected. These hypothetical micro black holes, which could form from the collision of cosmic rays and Earth's atmosphere or in particle accelerators like the Large Hadron Collider, would not be able to aggregate additional mass. Instead, they would evaporate in about 10−25 seconds, posing no threat to the Earth. Evolution Black holes can also merge with other objects such as stars or even other black holes. This is thought to have been important, especially in the early growth of supermassive black holes, which could have formed from the aggregation of many smaller objects. The process has also been proposed as the origin of some intermediate-mass black holes. Mergers of supermassive black holes may take a long time: As a binary of supermassive black holes approach each other, most nearby stars are ejected, leaving little for the remaining black holes to gravitationally interact with that would allow them to get closer to each other. This phenomenon has been called the final parsec problem, as the distance at which this happens is usually around one parsec. When a black hole accretes matter, the gas in the inner accretion disk orbits at very high speeds because of its proximity to the black hole. The resulting friction heats the inner disk to temperatures at which it emits vast amounts of electromagnetic radiation (mainly X-rays) detectable by telescopes. By the time the matter of the disk reaches the ISCO, between 5.7% and 42% of its mass will have been converted to energy, depending on the black hole's spin. About 90% of this energy is released within about 20 black hole radii. In many cases, accretion disks are accompanied by relativistic jets that are emitted along the black hole's poles, which carry away much of the energy. The mechanism for the creation of these jets is currently not well understood, in part due to insufficient data. Many of the universe's most energetic phenomena have been attributed to the accretion of matter on black holes. Active galactic nuclei and quasars are believed to be the accretion disks of supermassive black holes. X-ray binaries are generally accepted to be binary systems in which one of the two objects is a compact object accreting matter from its companion. Ultraluminous X-ray sources may be the accretion disks of intermediate-mass black holes. At a certain rate of accretion, the outward radiation pressure will become as strong as the inward gravitational force, and the black hole should unable to accrete any faster. This limit is called the Eddington limit. However, many black holes accrete beyond this rate due to their non-spherical geometry or instabilities in the accretion disk. Accretion beyond the limit is called Super-Eddington accretion and may have been commonplace in the early universe. Stars have been observed to get torn apart by tidal forces in the immediate vicinity of supermassive black holes in galaxy nuclei, in what is known as a tidal disruption event (TDE). Some of the material from the disrupted star forms an accretion disk around the black hole, which emits observable electromagnetic radiation. The correlation between the masses of supermassive black holes in the centres of galaxies with the velocity dispersion and mass of stars in their host bulges suggests that the formation of galaxies and the formation of their central black holes are related. Black hole winds from rapid accretion, particularly when the galaxy itself is still accreting matter, can compress gas nearby, accelerating star formation. However, if the winds become too strong, the black hole may blow nearly all of the gas out of the galaxy, quenching star formation. Black hole jets may also energize nearby cavities of plasma and eject low-entropy gas from out of the galactic core, causing gas in galactic centers to be hotter than expected. If Hawking's theory of black hole radiation is correct, then black holes are expected to shrink and evaporate over time as they lose mass by the emission of photons and other particles. The temperature of this thermal spectrum (Hawking temperature) is proportional to the surface gravity of the black hole, which is inversely proportional to the mass. Hence, large black holes emit less radiation than small black holes.: Ch. 9.6 A stellar black hole of 1 M☉ has a Hawking temperature of 62 nanokelvins. This is far less than the 2.7 K temperature of the cosmic microwave background radiation. Stellar-mass or larger black holes receive more mass from the cosmic microwave background than they emit through Hawking radiation and thus will grow instead of shrinking. To have a Hawking temperature larger than 2.7 K (and be able to evaporate), a black hole would need a mass less than the Moon. Such a black hole would have a diameter of less than a tenth of a millimetre. The Hawking radiation for an astrophysical black hole is predicted to be very weak and would thus be exceedingly difficult to detect from Earth. A possible exception is the burst of gamma rays emitted in the last stage of the evaporation of primordial black holes. Searches for such flashes have proven unsuccessful and provide stringent limits on the possibility of existence of low mass primordial black holes, with modern research predicting that primordial black holes must make up less than a fraction of 10−7 of the universe's total mass. NASA's Fermi Gamma-ray Space Telescope, launched in 2008, has searched for these flashes, but has not yet found any. The properties of a black hole are constrained and interrelated by the theories that predict these properties. When based on general relativity, these relationships are called the laws of black hole mechanics. For a black hole that is not still forming or accreting matter, the zeroth law of black hole mechanics states the black hole's surface gravity is constant across the event horizon. The first law relates changes in the black hole's surface area, angular momentum, and charge to changes in its energy. The second law says the surface area of a black hole never decreases on its own. Finally, the third law says that the surface gravity of a black hole is never zero. These laws are mathematical analogs of the laws of thermodynamics. They are not equivalent, however, because, according to general relativity without quantum mechanics, a black hole can never emit radiation, and thus its temperature must always be zero.: 11 Quantum mechanics predicts that a black hole will continuously emit thermal Hawking radiation, and therefore must always have a nonzero temperature. It also predicts that all black holes have entropy which scales with their surface area. When quantum mechanics is accounted for, the laws of black hole mechanics become equivalent to the classical laws of thermodynamics. However, these conclusions are derived without a complete theory of quantum gravity, although many potential theories do predict black holes having entropy and temperature. Thus, the true quantum nature of black hole thermodynamics continues to be debated.: 29 Observational evidence Millions of black holes with around 30 solar masses derived from stellar collapse are expected to exist in the Milky Way. Even a dwarf galaxy like Draco should have hundreds. Only a few of these have been detected. By nature, black holes do not themselves emit any electromagnetic radiation other than the hypothetical Hawking radiation, so astrophysicists searching for black holes must generally rely on indirect observations. The defining characteristic of a black hole is its event horizon. The horizon itself cannot be imaged, so all other possible explanations for these indirect observations must be considered and eliminated before concluding that a black hole has been observed.: 11 The Event Horizon Telescope (EHT) is a global system of radio telescopes capable of directly observing a black hole shadow. The angular resolution of a telescope is based on its aperture and the wavelengths it is observing. Because the angular diameters of Sagittarius A* and Messier 87* in the sky are very small, a single telescope would need to be about the size of the Earth to clearly distinguish their horizons using radio wavelengths. By combining data from several different radio telescopes around the world, the Event Horizon Telescope creates an effective aperture the diameter size of the Earth. The EHT team used imaging algorithms to compute the most probable image from the data in its observations of Sagittarius A* and M87*. Gravitational-wave interferometry can be used to detect merging black holes and other compact objects. In this method, a laser beam is split down two long arms of a tunnel. The laser beams reflect off of mirrors in the tunnels and converge at the intersection of the arms, cancelling each other out. However, when a gravitational wave passes, it warps spacetime, changing the lengths of the arms themselves. Since each laser beam is now travelling a slightly different distance, they do not cancel out and produce a recognizable signal. Analysis of the signal can give scientists information about what caused the gravitational waves. Since gravitational waves are very weak, gravitational-wave observatories such as LIGO must have arms several kilometers long and carefully control for noise from Earth to be able to detect these gravitational waves. Since the first measurements in 2016, multiple gravitational waves from black holes have been detected and analyzed. The proper motions of stars near the centre of the Milky Way provide strong observational evidence that these stars are orbiting a supermassive black hole. Since 1995, astronomers have tracked the motions of 90 stars orbiting an invisible object coincident with the radio source Sagittarius A*. In 1998, by fitting the motions of the stars to Keplerian orbits, the astronomers were able to infer that Sagittarius A* must be a 2.6×106 M☉ object must be contained within a radius of 0.02 light-years. Since then, one of the stars—called S2—has completed a full orbit. From the orbital data, astronomers were able to refine the calculations of the mass of Sagittarius A* to 4.3×106 M☉, with a radius of less than 0.002 light-years. This upper limit radius is larger than the Schwarzschild radius for the estimated mass, so the combination does not prove Sagittarius A* is a black hole. Nevertheless, these observations strongly suggest that the central object is a supermassive black hole as there are no other plausible scenarios for confining so much invisible mass into such a small volume. Additionally, there is some observational evidence that this object might possess an event horizon, a feature unique to black holes. The Event Horizon Telescope image of Sagittarius A*, released in 2022, provided further confirmation that it is indeed a black hole. X-ray binaries are binary systems that emit a majority of their radiation in the X-ray part of the electromagnetic spectrum. These X-ray emissions result when a compact object accretes matter from an ordinary star. The presence of an ordinary star in such a system provides an opportunity for studying the central object and to determine if it might be a black hole. By measuring the orbital period of the binary, the distance to the binary from Earth, and the mass of the companion star, scientists can estimate the mass of the compact object. The Tolman-Oppenheimer-Volkoff limit (TOV limit) dictates the largest mass a nonrotating neutron star can be, and is estimated to be about two solar masses. While a rotating neutron star can be slightly more massive, if the compact object is much more massive than the TOV limit, it cannot be a neutron star and is generally expected to be a black hole. The first strong candidate for a black hole, Cygnus X-1, was discovered in this way by Charles Thomas Bolton, Louise Webster, and Paul Murdin in 1972. Observations of rotation broadening of the optical star reported in 1986 lead to a compact object mass estimate of 16 solar masses, with 7 solar masses as the lower bound. In 2011, this estimate was updated to 14.1±1.0 M☉ for the black hole and 19.2±1.9 M☉ for the optical stellar companion. X-ray binaries can be categorized as either low-mass or high-mass; This classification is based on the mass of the companion star, not the compact object itself. In a class of X-ray binaries called soft X-ray transients, the companion star is of relatively low mass, allowing for more accurate estimates of the black hole mass. These systems actively emit X-rays for only several months once every 10–50 years. During the period of low X-ray emission, called quiescence, the accretion disk is extremely faint, allowing detailed observation of the companion star. Numerous black hole candidates have been measured by this method. Black holes are also sometimes found in binaries with other compact objects, such as white dwarfs, neutron stars, and other black holes. The centre of nearly every galaxy contains a supermassive black hole. The close observational correlation between the mass of this hole and the velocity dispersion of the host galaxy's bulge, known as the M–sigma relation, strongly suggests a connection between the formation of the black hole and that of the galaxy itself. Astronomers use the term active galaxy to describe galaxies with unusual characteristics, such as unusual spectral line emission and very strong radio emission. Theoretical and observational studies have shown that the high levels of activity in the centers of these galaxies, regions called active galactic nuclei (AGN), may be explained by accretion onto supermassive black holes. These AGN consist of a central black hole that may be millions or billions of times more massive than the Sun, a disk of interstellar gas and dust called an accretion disk, and two jets perpendicular to the accretion disk. Although supermassive black holes are expected to be found in most AGN, only some galaxies' nuclei have been more carefully studied in attempts to both identify and measure the actual masses of the central supermassive black hole candidates. Some of the most notable galaxies with supermassive black hole candidates include the Andromeda Galaxy, Messier 32, Messier 87, the Sombrero Galaxy, and the Milky Way itself. Another way black holes can be detected is through observation of effects caused by their strong gravitational field. One such effect is gravitational lensing: The deformation of spacetime around a massive object causes light rays to be deflected, making objects behind them appear distorted. When the lensing object is a black hole, this effect can be strong enough to create multiple images of a star or other luminous source. However, the distance between the lensed images may be too small for contemporary telescopes to resolve—this phenomenon is called microlensing. Instead of seeing two images of a lensed star, astronomers see the star brighten slightly as the black hole moves towards the line of sight between the star and Earth and then return to its normal luminosity as the black hole moves away. The turn of the millennium saw the first 3 candidate detections of black holes in this way, and in January 2022, astronomers reported the first confirmed detection of a microlensing event from an isolated black hole. This was also the first determination of an isolated black hole mass, 7.1±1.3 M☉. Alternatives While there is a strong case for supermassive black holes, the model for stellar-mass black holes assumes of an upper limit for the mass of a neutron star: objects observed to have more mass are assumed to be black holes. However, the properties of extremely dense matter are poorly understood. New exotic phases of matter could allow other kinds of massive objects. Quark stars would be made up of quark matter and supported by quark degeneracy pressure, a form of degeneracy pressure even stronger than neutron degeneracy pressure. This would halt gravitational collapse at a higher mass than for a neutron star. Even stronger stars called electroweak stars would convert quarks in their cores into leptons, providing additional pressure to stop the star from collapsing. If, as some extensions of the Standard Model posit, quarks and leptons are made up of the even-smaller fundamental particles called preons, a very compact star could be supported by preon degeneracy pressure. While none of these hypothetical models can explain all of the observations of stellar black hole candidates, a Q star is the only alternative which could significantly exceed the mass limit for neutron stars and thus provide an alternative for supermassive black holes.: 12 A few theoretical objects have been conjectured to match observations of astronomical black hole candidates identically or near-identically, but which function via a different mechanism. A dark energy star would convert infalling matter into vacuum energy; This vacuum energy would be much larger than the vacuum energy of outside space, exerting outwards pressure and preventing a singularity from forming. A black star would be gravitationally collapsing slowly enough that quantum effects would keep it just on the cusp of fully collapsing into a black hole. A gravastar would consist of a very thin shell and a dark-energy interior providing outward pressure to stop the collapse into a black hole or formation of a singularity; It could even have another gravastar inside, called a 'nestar'. Open questions According to the no-hair theorem, a black hole is defined by only three parameters: its mass, charge, and angular momentum. This seems to mean that all other information about the matter that went into forming the black hole is lost, as there is no way to determine anything about the black hole from outside other than those three parameters. When black holes were thought to persist forever, this information loss was not problematic, as the information can be thought of as existing inside the black hole. However, black holes slowly evaporate by emitting Hawking radiation. This radiation does not appear to carry any additional information about the matter that formed the black hole, meaning that this information is seemingly gone forever. This is called the black hole information paradox. Theoretical studies analyzing the paradox have led to both further paradoxes and new ideas about the intersection of quantum mechanics and general relativity. While there is no consensus on the resolution of the paradox, work on the problem is expected to be important for a theory of quantum gravity.: 126 Observations of faraway galaxies have found that ultraluminous quasars, powered by supermassive black holes, existed in the early universe as far as redshift z ≥ 7 {\displaystyle z\geq 7} . These black holes have been assumed to be the products of the gravitational collapse of large population III stars. However, these stellar remnants were not massive enough to produce the quasars observed at early times without accreting beyond the Eddington limit, the theoretical maximum rate of black hole accretion. Physicists have suggested a variety of different mechanisms by which these supermassive black holes may have formed. It has been proposed that smaller black holes may have also undergone mergers to produce the observed supermassive black holes. It is also possible that they were seeded by direct-collapse black holes, in which a large cloud of hot gas avoids fragmentation that would lead to multiple stars, due to low angular momentum or heating from a nearby galaxy. Given the right circumstances, a single supermassive star forms and collapses directly into a black hole without undergoing typical stellar evolution. Additionally, these supermassive black holes in the early universe may be high-mass primordial black holes, which could have accreted further matter in the centers of galaxies. Finally, certain mechanisms allow black holes to grow faster than the theoretical Eddington limit, such as dense gas in the accretion disk limiting outward radiation pressure that prevents the black hole from accreting. However, the formation of bipolar jets prevent super-Eddington rates. In fiction Black holes have been portrayed in science fiction in a variety of ways. Even before the advent of the term itself, objects with characteristics of black holes appeared in stories such as the 1928 novel The Skylark of Space with its "black Sun" and the "hole in space" in the 1935 short story Starship Invincible. As black holes grew to public recognition in the 1960s and 1970s, they began to be featured in films as well as novels, such as Disney's The Black Hole. Black holes have also been used in works of the 21st century, such as Christopher Nolan's science fiction epic Interstellar. Authors and screenwriters have exploited the relativistic effects of black holes, particularly gravitational time dilation. For example, Interstellar features a black hole planet with a time dilation factor of over 60,000:1, while the 1977 novel Gateway depicts a spaceship approaching but never crossing the event horizon of a black hole from the perspective of an outside observer due to time dilation effects. Black holes have also been appropriated as wormholes or other methods of faster-than-light travel, such as in the 1974 novel The Forever War, where a network of black holes is used for interstellar travel. Additionally, black holes can feature as hazards to spacefarers and planets: A black hole threatens a deep-space outpost in 1978 short story The Black Hole Passes, and a binary black hole dangerously alters the orbit of a planet in the 2018 Netflix reboot of Lost in Space. Notes References Further reading External links |
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Contents One Big Beautiful Bill Act The One Big Beautiful Bill Act (OBBBA) or the Big Beautiful Bill (P.L. 119-21), is a U.S. federal statute passed by the 119th United States Congress containing tax and spending policies that form the core of President Donald Trump's second-term agenda. The bill was signed into law by Trump on July 4, 2025. Although the law is popularly referred to as the One Big Beautiful Bill Act, this official short title was removed from the bill during the Senate amendment process. Therefore, the law officially has no short title. The OBBBA contains hundreds of provisions. It permanently extends the individual tax rates Trump signed into law in 2017, which were set to expire at the end of 2025. It raises the cap on the state and local tax deduction to $40,000 for taxpayers making less than $500,000, with the cap reverting to $10,000 after five years. The OBBBA includes several tax deductions for tips, overtime pay, auto loans, and creates Trump accounts, allowing parents to create tax-deferred accounts for the benefit of their children, all set to expire in 2028. It includes a permanent $200 increase in the child tax credit, a 1% tax on remittances, and a tax hike on investment income from college endowments. It phases out some clean energy tax credits that were included in the Biden-era Inflation Reduction Act, and promotes fossil fuels over renewable energy. It increases a tax credit for advanced semiconductor manufacturing and repeals a tax on silencers. It raises the debt ceiling by $5 trillion while making a significant 12% cut to Medicaid spending. The OBBBA expands work requirements for SNAP benefits (formerly called "food stamps") recipients and makes states responsible for some costs relating to the food assistance program. The OBBBA includes $150 billion in new defense spending and another $150 billion for border enforcement and deportations. The law increases the funding for Immigration and Customs Enforcement (ICE) from $10 billion to more than $100 billion by 2029, making it the single most funded federal law enforcement agency. The Congressional Budget Office (CBO) estimates the law will increase the budget deficit by $2.8 trillion by 2034 and cause 10.9 million Americans to lose health insurance coverage. Further CBO analysis estimated the highest 10% of earners would see incomes rise by 2.7% by 2034 mainly due to tax cuts, while the lowest 10% would see incomes fall by 3.1% mainly due to cuts to programs such as Medicaid and food aid. Several think tanks, experts, and opponents criticized the bill over its regressive tax structure, described many of its policies as gimmicks, and argued the bill would create the largest upward transfer of wealth from the poor to the rich in American history, exacerbating inequality among the American population. It has also drawn controversy for rolling back clean energy incentives and increasing funding for immigration enforcement and deportations. According to multiple polls, a majority of Americans oppose the law. Democratic opposition to the health spending cuts included in the OBBBA contributed to the 2025 United States federal government shutdown. Background Following the 2024 United States elections, in which the Republican Party retained the House of Representatives and won the Senate, Republicans began negotiations on passing then-president-elect Donald Trump's domestic policies. In a meeting with Senate Republicans in December 2024, Senate majority leader John Thune outlined an approach involving initial legislation on border security, energy production, and the military while reserving tax policy. Trump, in contrast, advocated for a singular bill to resolve an impending lapse in tax cuts implemented in the Tax Cuts and Jobs Act in 2017. However, this strategy faced risks from defecting members. In January 2025, Republicans met in Fort Lesley J. McNair. At the meeting, Speaker of the House Mike Johnson stated that Trump sought "one big, beautiful bill" to enact his policies. To more easily pass the bill, Republicans chose to use the budget reconciliation process, which allowed them to avoid the 60-vote Senate filibuster, which carried importance as they hold 53 seats out of 100 in the Senate. This requires the House and the Senate to pass identical instructions before passing the actual reconciliation bill. Before being signed into law, the Senate approved the bill 51–50 on July 1, 2025, with Vice President JD Vance casting a tiebreaking vote in support. It passed the House of Representatives, 218–214, on July 3, 2025. It passed over universal Democratic opposition in both houses. Provisions The One Big Beautiful Bill Act includes hundreds of provisions, and over a ten-year period is estimated to add roughly $3 trillion to the national debt and to cut approximately $4.46 trillion in tax revenue. The law permanently extends the individual tax rates Trump signed into law in 2017, which were set to expire at the end of 2025. The law creates a new tax deduction of up to $12,500 ($25,000 if married filing jointly) of qualified overtime pay, effective January 1, 2025. Qualified overtime pay is compensation that an employer is required to pay an employee under the Fair Labor Standards Act, Section 7 because the employee worked more than 40 hours during the same workweek. The employee may take a tax deduction only for the extra half-time pay above their usual hourly rate they are paid for working more than 40 hours during the same workweek, not all the pay they receive for working those hours. Overtime paid that is either paid voluntarily by an employer, is paid based on contractual agreements, or is only required by state or local laws is not eligible for the tax deduction. Overtime pay continues to be subject to Social Security tax and Medicare tax. The deduction begins to phase out for individuals whose modified adjusted gross income is more than $150,000 (or $300,000 if married filing jointly), and is eliminated at $400,000 (or $550,000 if married filing jointly).[a] Individuals may take a tax deduction for the amount of qualified overtime compensation that appears on their Form W-2, which employers will be required to include on it. Employers may use a reasonable method to approximate the amount to put on a Form W-2 for 2025, or via an alternate method. The Internal Revenue Service will release new procedures for federal tax withholding effective 2026. The law creates new tax deductions for tips of up to $25,000 per year received by workers earning less than $150,000, with the tax deduction set to expire in 2028. In order to be eligible, a tip must be paid voluntarily by the payor, and the payor must determine the amount of the tip. The payor must not be subject to a penalty if they do not pay a tip, and the tips must not be subject to any negotiation. The tip must be given to a workers working one of 68 different job types.[b] The recipient of the tip must put their social security number on their income tax return to be eligible. The law allows individuals to deduct up to $10,000 per year in auto loan interest for new cars that had their final assembly in the United States and were purchased between January 1, 2025, and December 31, 2028. The vehicle must be for personal use, rather than business use. It must be a car, minivan, van, sport utility vehicle, pickup truck, or motorcycle with a gross vehicle weight rating of less than 14,000 pounds. All-terrain vehicles, trailers, campers, used vehicles, and leased vehicles are not eligible. The vehicle's Automobile Information Disclosure label must show that the place of its final assembly was the United States. The maximum tax deduction is reduced out for individuals whose modified adjusted gross income is greater than $100,000 (or $200,000 for married couples filing jointly), and it is eliminated for individuals whose modified adjusted gross income is greater than $150,000 (or $250,000 if married filing jointly). A taxpayer is not required to itemize their tax deductions in order to take the tax deduction. From 2025 to 2028, auto loan lenders are required to report loan details to the Internal Revenue Service if they receive at least $600 of interest on qualifying vehicle loans. From January 1, 2025, to December 31, 2029, individuals may take a tax deduction for up to $40,000 of state and local taxes ($20,000 if married filing separately), which is an increase from $10,000 previously. There is a reduction to the limit for the tax deduction for individuals whose modified adjusted gross income is over $500,000 ($250,000 for married filing separately) but it never goes below $10,000. This provision has an estimated cost of $142 billion. Republican representatives Elise Stefanik, Mike Lawler, Nick LaLota, and Andrew Garbarino of New York, Representative Young Kim of California, and Representative Tom Kean Jr. of New Jersey cut this deal with House speaker Mike Johnson in exchange for their votes.[citation needed] The law permanently eliminates the personal exemption, which had been temporarily eliminated by the Tax Cuts and Jobs Act of 2017. It offers a temporary tax deduction, set to expire in 2028, of up to $6,000 for seniors. The deduction phases out for individuals with modified adjusted gross income (MAGI) exceeding $75,000 (or $150,000 for married couples). According to the Council of Economic Advisors, this would result in 88% of seniors being able to claim enough deductions to clear their Social Security tax burden, up from 64% under prior law. A taxpayer is not required to itemize their tax deductions in order to take the tax deduction. The law increases the maximum amount of the child tax credit from $2,000 to $2,200 per child, and indexes the amount of the credit to inflation and only applies to U.S citizens or qualifying noncitizens.[c] The refundable portion of the credit is also indexed to inflation, but is not increased, meaning that tax credit beneficiaries would not see a net increase in the credit, when adjusted for inflation. The law changes the existing nonrefundable tax credit for up to $17,280 of qualified adoption expenses. As of January 1, 2025, up to $5,000 of the adoption tax credit is a refundable tax credit. Effective January 1, 2026, the law allows a tax deduction for charitable contributions made in cash by an individual who does not itemize their tax deductions. The deduction is limited to $1,000 (or $2,000 if married filing jointly). The deduction is not allowed for contributions to donor-advised funds or private non-operating foundations. Carrying over excess charitable contributions to other years is not allowed if the person does not itemize their tax deductions. Effective January 1, 2026, for individuals who itemize their charitable contributions, a tax deduction is allowed only for the amount that exceeds 0.5 percent of their adjusted gross income.[d] The law makes permanent a temporary limit on cash tax deductions for charitable contributions of up to 60 percent of their adjusted gross income to 501(c)(3) public charities. This only applies if the individual itemizes their tax deductions. Effective January 1, 2026, the tax benefit for charitable contributions made by an individual that itemizes their tax deductions is limited to 35% of the amount contributed, even if they are in a marginal tax bracket higher than 35%. Previously, educators could take a tax deduction for unreimbursed education costs of up to $300 per year (or $600 if married filing jointly) without itemizing their tax deductions. Effective January 1, 2026, eligible educators may also take an itemized tax deduction for unreimbursed education costs in excess of $300 per year (or $600 if married filing jointly). In order to qualify, the individual must work at any K–12 school for least 900 hours during the school year as a teacher, instructor, counselor, principal, aide, interscholastic sports coach, or sports administrator. The unreimbursed education costs must be directly related to the individual's work as an educator. Eligible unreimbursed education costs include books, supplies, other classroom materials, equipment, professional development courses or training that is related to the curriculum or student instruction. The tax credit for buying a new qualified electric vehicle or fuel cell electric vehicle is no longer available for purchases made after September 30, 2025. The tax credit for buying a used qualified electric vehicle or fuel cell vehicle from a licensed dealer is no longer available for purchases made after September 30, 2025. The tax credit for installing property to either recharge electric vehicles or to store or dispense clean-burning fuel will no longer be available after June 30, 2026. The tax credit for making qualified energy-efficient improvements to one's home will no longer be available for improvements put into service after December 31, 2025. The tax credit for installing solar electric panels, solar water heaters, wind turbines, geothermal heat pumps, fuel cells, or battery storage technology in one's home will no longer be available for improvements made after December 31, 2025. Itemized deductions are reduced by 2/37 of the lesser of the amount of the itemized tax deductions or the taxable income that is within the 37%-rate marginal tax bracket.[e] As an exception, the qualified business income deduction under 26 U.S.C. § 199A is not subject to the limitation. Effective January 1, 2026, the law establishes a 1% excise tax on certain electronic transfers of funds from the United States to a foreign country.[f] The tax is on the electronic transfer of funds from an individual located in any U.S. state, U.S. territory, or the District of Columbia to a recipient in a foreign country for personal, family, or household purposes. The excise tax is assessed on electronic transfers sent using cash, money orders, cashier's checks, prepaid card reloads, wire transfers, online bill payments, and similar methods. The excise tax is assessed on the amount transferred and not on any fees that the sending institution charges the sender to complete the transfer. The excise tax is supposed to be paid by the sender of the remittance; the transfer provider must pay the excise tax if the sender does not. A transfer to a U.S. military base located in a foreign country are considered to ne received in the United States and is not subject to the remittance tax. Additionally, transfers of $15 or less are not subject to the remittance tax. Certain transfers are exempt, such as those from financial accounts held at institutions subject to the Bank Secrecy Act, such as U.S. banks, U.S. credit unions, U.S. investment companies, and certain U.S. branches of foreign banks; transfers paid with a U.S.-issued debit or credit card; and transfers of cryptocurrency. The estate, gift, and generation-skipping transfer tax exemption will increase from $13.99 million in 2025 to $15 million in 2026. The exemption amounts for subsequent years will be indexed for inflation. Public companies are not allowed to take a tax deduction for compensation paid to certain executives that exceeds $1 million per year. Effective tax years beginning after December 31, 2026, the compensation paid to the five most highly compensated executives is expanded to all members of a covered corporation's controlled group and affiliated service group. The tax deductible portion of compensation is allocated to each control group member based on the pro-rata portion of the compensation paid by that member. For qualified production property of a taxpayer, the law makes permanent a 100% Section 179 depreciation deduction for the adjusted basis for the property acquired after January 19, 2025. Businesses are allowed to take a section 179 tax deduction for the cost of certain business property, software, leasehold improvements, and water utility property rather than deduct only the amount depreciated each year. Under the law, the maximum tax deduction is permanently increased from $1 million to $2.5 million and then phased out to $4 million, all of which will be indexed for inflation in future years. These changes are effective for tax years beginning after December 31, 2024. The law also created a new depreciation allowance for nonresidential real property that is used as an essential part of an activity that includes the manufacturing, production, or refining of certain tangible products that significantly transforms the product. Types of property that do not qualify include nonresidential real property used for offices, administrative services, lodging, parking, sales activities, software development, and software engineering. The property's construction must begin between January 20, 2025, and December 31, 2028, and it must be placed in service in the U.S. or U.S. possessions on or before December 31, 2030. The law allows full expensing of domestic research and experimentation expenditures for tax years beginning on or after January 1, 2025. The law allows businesses to hold an election to amortize domestic research and experimentation expenditures that are otherwise capitalized (other than property that would be depreciated or depleted) over a five-year period. The law allows certain businesses to elect to claim a tax deduction for unamortized domestic research and experimentation costs in the first tax year beginning after 2024 or ratably over a two-year period. The law allows certain small businesses[g] to retroactively expense its domestic research and experimentation costs for tax years that began on or after January 1, 2022. The law changes the calculation of the limit on interest expense tax deductions such that deductions for depreciation, amortization, or depletion are excluded when calculating adjusted taxable income. The 20% deduction for qualified business income for owners of pass-through entities was made permanent. The law increases the CHIPS and Science Act's tax credit for advanced semiconductor manufacturing from 25% to 35%. The tax credit for energy efficient commercial buildings is no longer available for any property if the construction begins after June 30, 2026. The law expands the Low-Income Housing Tax Credit with a housing credit allocation increase and a bond threshold test reduction, projected to add up to 1.22 million additional affordable rental homes from 2026 to 2035. To incentivize business investments in poorer neighborhoods, the law makes the LIHTC permanent, along with the New Markets Tax Credit Program and Opportunity Zones, restructuring the latter with tighter accountability standards, although the law does not create any new legal incentives for affordable housing or industrial lands cleanup. The law allows a tax deduction for restaurants and caterers for the cost of providing a free meal to workers while on shift. Companies can also take a tax deduction for the cost of free meals provided to workers on offshore oil rigs and gas platform workers. Companies that are required to provide meals to maritime crew under federal law may also take a tax deduction for the cost of those meals. Beauty service businesses are now allowed a tax credit for the FICA taxes they pay on their employees' tips that bring them up to the federal minimum wage. Prior to this, only food or beverage businesses were eligible for this tax credit. The change is effective for tax years beginning after December 31, 2024. The law establishes a new 2.5% tax credit for metallurgical coal.[h] As of 2026, corporations may take a tax deduction for charitable contributions for the amount that exceeds 1 percent of its taxable income and does not exceed 10 percent of its taxable income. Charitable contributions that do not qualify for a tax deduction because of this change may be carried forward for five years. The law reduced the tax rate on foreign-derived intangible income to 14 percent. The law increases the tax deduction for whaling boat captains increasing maximum deduction from $10,000 of whale hunting expenses up to $50,000. Effective in 2026, certain tax-exempt organizations[i] must pay an excise tax on compensation exceeding $1 million paid to any current and former employee, rather than only to its top five most highly compensated employees for current and prior years. The law changes the excise tax on the investment income of tax-exempt educational institutions. There are three different excise tax rates, and the highest excess tax rate is 8 percent. The excise tax rate depends on the institution's ratio of its investment assets to its eligible students. Institutions with higher ratios are subject to higher excise tax rates. The law increases taxes on investment income from college endowments, estimated to raise $761 million over 10 years. Colleges with more than 3,000 students and an endowment per student ratio of $500,000 would be taxed starting at 1.4%, with the tax rate increasing to 8% for the wealthiest colleges. The original House bill proposed a tax of up to 21% with no exemptions based on size. An exemption for religious colleges was removed for violating the Byrd Rule. The law reverses aspects of Medicare's price negotiation program, allowing more drugs to be purchased without negotiation and increasing costs for consumers. The Congressional Budget Office estimated $5 billion in lost savings for the government over ten years. The law establishes a $50 billion Rural Hospital Fund, up from $25 billion, to support health care providers in rural areas, providing a safety net against Medicaid cuts; The law cuts over $1.2 trillion in federal spending, primarily from the low-income health insurance program Medicaid and the nutrition funding program SNAP. The law: The law: The law creates Trump accounts, a type of tax-advantaged savings investment account. Any individual is allowed to contribute to a child's account, up to $5,000 per year per child. Employers are allowed to contribute to their employees' accounts and their employees' children's accounts, up to $2,500 per year. Contributions by an employer count against the $5,000 annual limit per child, but contributions by the federal government do not. As an exception to the annual limit, tax-exempt organizations are allowed to contribute an unlimited amount into a child's account. Contributions into a child's account are allowed until the end of the end of the year in which the child turns 18. The federal government will contribute $1,000 into a Trump account for each U.S. citizen child with a social security number who was born between January 1, 2025, and December 31, 2028. Funds in the account must be invested in mutual funds or exchange-traded funds that mirror the S&P 500 or another U.S. stock index. Investment earnings are tax-deferred. A child with a qualified disability[j] is allowed to rollover the funds into an ABLE account when they reach age 17. For other children, rollovers and withdrawals from the account are allowed starting on the January 1 of the year in which the child turns age 18. When the child reaches age 18, the funds will be rolled into a traditional IRA. Contributions by the federal government or an employer are tax-exempt (i.e., they are not taxed as income of the child when they are deposited), while contributions by the child or their parents are neither tax-exempt nor tax-deductible (i.e., they are taxed as income of the child or a gift to the child and they come from after-tax funds of the giver). Withdrawals are subject to taxation in the same way as traditional IRAs are.[k] Trump accounts will be available for initial deposits on July 4, 2026. The law phases out tax credits passed in the Biden-era Inflation Reduction Act. Credits will continue for wind and solar projects which either start construction by June 2026 or which go online by December 2027, under "safe harbor" and expanded "foreign entity of concern" provisions.[l][m] The OBBBA directed the Treasury Department to issue more stringent standards for documenting supply chains and construction of solar and wind facilities in August 2025. The OBBBA also severely limits the credits' transferability in dedicated markets. Electric vehicle tax credits would be phased out by September 2025, and EV charging tax credits would be phased out by June 2026. Green hydrogen production credits are terminated by December 2027, rather than 2033. Home electrification credits are terminated by December 2025. Advanced manufacturing, carbon sequestration, biofuel, and nuclear power credits remain largely intact (nuclear power even gets a new 10% bonus credit), subject to the aforementioned foreign entity of concern rules. Fees on methane emissions that polluters have to pay the government would be postponed for 10 years, while tax credits for biofuels would be extended an additional four years to 2031. The law also rescinds various funds, appropriated in the IRA. These include: The law rescinds unobligated IRA funding for the Conservation Stewardship Program, Environmental Quality Incentives Program, Agricultural Conservation Easements Program, and Regional Conservation Partnership Program, and adds it to the USDA budget baseline. The OBBBA outlaws climate action-related goals for agriculture. The law also lifts income caps on households that rely on agriculture for more than 75% of their income, potentially empowering corporate farming. The law raises reference prices under the Price Loss Coverage and Agricultural Risk Coverage programs, resulting in $54 billion in additional spending over 10 years. The law increases spending on crop insurance programs by $6.3 billion over 10 years and disaster relief programs at USDA by $2.9 billion in the same timeframe. The law requires the leasing of at least 50% of public lands that private companies desire to lease for drilling, mining or logging. It cuts the royalties (the share of revenue) that the petroleum industry has had to pay for oil and gas extracted from public lands—costing taxpayers around $6 billion over a decade. It cuts the fee per acre that oil and gas companies have had to pay for initiating leasing of public lands. The law reinstates "noncompetitive leasing" of public lands for drilling, mining or logging that allows companies to purchase at a cheap price public lands that were not sold at auction. Over the next decade, the law requires four lease sales to oil and gas companies of lands inside Arctic National Wildlife Refuge, and six lease sales in the National Petroleum Reserve-Alaska along Alaska's northern coast. The law requires the Bureau of Land Management to hold quarterly onshore oil and gas lease sales. The law raises the United States debt ceiling by $5 trillion. The defense portion of the law allocates an additional $150 billion in defense spending. This figure includes: The law includes $170 billion for spending on border security, creating the capacity to deport up to one million people each year. The law increases the funding for Immigration and Customs Enforcement from $10 billion to more than $100 billion by 2029, making it the single most heavily funded law enforcement agency in the federal government. These funds include: The law establishes a $100 annual fee to apply for asylum, down from $1,000 in the House bill, a $550 fee to apply for employment authorization for asylum seekers and migrants on humanitarian parole or temporary protected status, and a $500 fee to apply for temporary protected status. It also increases the fees for non-immigrant visas to $250. The law: A 529 plan will be allowed to distribute funds for the cost to attend an elementary or secondary school, including a public, private, or religious school, after July 4, 2025. Eligible costs include tuition, curriculum and curricular materials, books, instructional materials, online educational materials, and tuition for certain tutoring or educational classes outside one's home. A 529 plan will be allowed to distribute funds for eligible costs of a state and federal licensing program, an industry certification program, or a registered apprenticeship program after July 4, 2025. Eligible costs include tuition, fees, books, supplies, required testing, and continuing education needed to maintain the credential. As of January 1, 2026, the employer-provided childcare credit (26 U.S.C. § 45F) is increased from 25% to 40% (or 50% for eligible small businesses[n]) of qualified childcare expenses. The maximum employer-provided childcare tax credit is increased from $150,000 to $500,000 per year (or $600,000 for eligible small businesses[n]). The act also expands qualified childcare expenses to include contracted third parties that provide childcare to the employees. The annual limit for a dependent care flexible spending account is increased from $5,000 per year (or $2,500 if married filing separately) to $7,500 (or $3,750 if married filing separately). The temporary tax credit for employers who give paid leave to an employee while they are on Family and Medical Leave Act leave has been made permanent. In order to qualify for the tax credit, the employer must pay the employee at least 50% of the employee's usual wages. The amount of the tax credit used to be equal to 12.5% of eligible wages paid to an eligible employee, but it now increases by 0.25% for each percentage point paid above the 50% threshold, up to a maximum credit of 25%. In order to be eligible for the tax credit, the employee must have worked at least six months for the employer, which is up from 12 months previously. Paid family and medical leave that is required under state or local law is now eligible for the tax credit, as are employer-paid amounts for qualifying paid leave insurance policies. Food or beverage provided to employees on certain fishing vessels or certain fish processing facilities for the employer's convenience is 100% tax deductible to the employer, up from 50% previously. Employer-paid moving expense benefits were temporarily considered taxable income to the employee, but they are now permanently taxable income. Moving expense benefits for employees who are active-duty members of the U.S. Armed Forces or members of the U.S. Intelligence Community continue to be tax-free to the employee. For employer-reimbursed bicycle commuting benefits, these payments are considered taxable income to the employee. Student loan repayments made by employers to their employees were temporarily tax-free to the employees but they are now permanently tax-free. The tax-free limit per year will be indexed for inflation starting in 2026. Individuals covered by a bronze-level or a catastrophic health plan offered in the individual market on a state insurance exchange are now allowed to make and receive health savings account contributions. The law made permanent a temporary rule that allowed health plans to cover telehealth services without a deductible and still be compatible with a health savings account. The law allows a high-deductible health plan to provide benefits for direct primary care to enrollees who have not yet met the deductible and still be eligible for a Health Savings Account. In order to qualify, the direct primary care services needs to be for a flat fee of up to $150 per month for a single individual (or $300 per month for multiple individuals). These services are also added to the definition of medical expenses for a health savings account. A payor must report payments for goods or services via payment apps, online marketplaces, and payments from credit, debit, or gift cards to the Internal Revenue Service and the payee on Form 1099-K. The law changes the threshold for reporting; now reporting on Form 1099-K is required if a person received at least 200 transactions and received at least $20,000. The law increases the reporting threshold for Form 1099-MISC and Form 1099-NEC from $600 to $2,000 in 2026. The threshold will be adjusted for inflation for future years. The law contains the following additional provisions: Legislative history Initially, on February 21, 2025, the Senate approved S. Con. Res. 7 by 52–48, intended to be the first of two reconciliation instruction bills. The resolution allowed for a future reconciliation bill containing $175 billion for immigration and border enforcement, $150 billion for the military and would not extend the 2017 Trump tax cuts. Senator Rand Paul of Kentucky was the only Republican to oppose the resolution. The Senate intended to allow the House to pass reconciliation instructions first. At the time of the bill's passage, the House faced opposition to its one-bill approach from fiscally conservative members. On February 25, 2025, the House of Representatives approved H. Con. Res. 14 by a 217–215 vote. The resolution would allow Republicans to pass a budget containing tax cuts while reducing federal spending. The resolution would also allow Congress to raise the debt limit by $4 trillion. The resolution was briefly pulled due to opposition from fiscally conservative Republicans Thomas Massie of Kentucky, Tim Burchett of Tennessee, Warren Davidson of Ohio, and Victoria Spartz of Indiana. Leadership convinced all but Massie to support the resolution, and the vote happened as scheduled. Initially, some moderate Republicans also expressed opposition over the possibility that the resolution would necessitate cuts to Medicare and Medicaid. In the end, Massie was the only House Republican to vote against the resolution. In the early hours of April 5, 2025, the Senate approved an amended version of H. Con. Res. 14 by a 51–48 vote. The Senate budget resolution calls for $4 billion in spending cuts, significantly lower than the $1.5 trillion in cuts called for by the House. The Senate resolution also calls for a $5 trillion raise in the debt limit, $1 trillion more than the House resolution. The House and the Senate resolutions would each extend Trump's 2017 tax cuts. Republican senators Susan Collins of Maine and Rand Paul of Kentucky joined all Democratic senators in opposing the resolution. After the vote, Reuters reported that non-partisan analysts believe that the resolution, if enacted as currently written, would add $5.7 trillion to the national debt of the United States over the next 10 years. Republicans argue that the extension of the 2017 tax cuts, which expire at the year's end, should not be counted as new debt, which means that only $1.5 trillion would be added to the national debt over the next 10 years. The House had to pass the Senate's amended resolution to continue the reconciliation process. House Republican leadership intended to vote on the resolution on April 9. The resolution was pulled due to opposition from 12 fiscally conservative Republicans. The resolution passed the following morning in a 215–214 vote after the Senate pledged also to seek at least $1.5 trillion in cuts. Fiscally conservative Republicans Thomas Massie and Victoria Spartz were the only members of their party to vote against the resolution. Following markups by various House committees on their relevant portions of the bill, the House Budget Committee met on May 16, 2025, to combine the various markups into a single reconciliation bill. Some fiscally conservative Republicans opposed the bill over a desire for greater spending cuts, and the bill was rejected in a 21–16 vote, with representatives Chip Roy of Texas, Ralph Norman of South Carolina, Andrew Clyde of Georgia, and Josh Brecheen of Oklahoma joining all Democratic committee members to vote against it. Republican Lloyd Smucker of Pennsylvania changed his vote from yes to no so that he would be allowed to bring a motion to reconsider the bill at a later time. On May 18, the Budget Committee voted to advance the bill in a 17–16 vote. Roy, Norman, Clyde, and Brecheen changed their votes to present after House Republican leadership agreed to make Medicaid work requirements—previously scheduled to begin in 2029—kick in sooner and decrease future subsidies for clean energy. Despite this, the four Republicans said they would not support the bill's final passage unless more changes were made. Republicans did not secure these votes until May 21, when the bill was amended. On the morning of May 22, the United States House of Representatives passed OBBBA by a vote of 215–214–1, mostly along party lines. Fiscally conservative Republicans Thomas Massie and Warren Davidson broke from their party to vote against the bill. Freedom Caucus chair Andy Harris of Maryland voted present. Republicans David Schweikert of Arizona and Andrew Garbarino of New York did not vote on the measure. House Democrats unanimously opposed OBBBA. On June 10, Republicans announced that they would amend OBBBA through a procedural rule. By using a procedural rule to amend the bill, Republicans voting against amendments would also be voting against consideration of other, unrelated bills. The rule passed, 213–207, with Massie the only present Republican to vote against the rule. The narrow passage of OBBBA led to internal backlash and division in the Democratic Party. Three elderly Democratic representatives (Raúl Grijalva of Arizona, age 77; Sylvester Turner of Texas, age 70; and Gerry Connolly of Virginia, age 75) died in the first five months of 2025. If any of the three had been alive when the vote was taken, the result of the vote could have been different. The vote "quickly reignited an intraparty debate about gerontocracy and aging politicians clinging to power". Following the House passage of OBBBA, the bill moved to the Senate for consideration. The Republican-led Senate amended the bill. Fiscally conservative Republican Senators (nicknamed "deficit hawks") such as Ron Johnson of Wisconsin, Rick Scott of Florida, Mike Lee of Utah, and Rand Paul of Kentucky, pushed for deeper spending cuts. Moderate Republicans such as Susan Collins of Maine, Lisa Murkowski of Alaska, and Jerry Moran of Kansas, along with populist Josh Hawley of Missouri, expressed concerns about Medicaid cuts. Other moderates such as John Curtis of Utah and Thom Tillis of North Carolina, along with Murkowski and Moran, expressed concerns over the end of green energy tax credits. Defense hawks such as Mike Rounds of South Dakota were opposed to spectrum auction provisions in the bill. Democrats in the Senate sought to use the Byrd Rule, which prevents reconciliation from being used to pass "extraneous" measures in bills which increase federal spending in the Senate, in order to strip certain provisions from the bill. Democrats argued that the extension of Trump's 2017 tax cuts, a proposed 10-year ban on state level AI regulations, language that limits the power of federal court to enforce contempt of court citations, a provision to end a tax on the manufacturing of gun silencers, a provision to defund Planned Parenthood, a provision banning Medicaid from funding gender-affirming care for people of all ages and a provision to streamline permits for fossil fuel projects, violated the Byrd Rule. Senate majority leader John Thune set a goal of passing the Senate's version of OBBBA by July 4, 2025. On June 20, 2025, the Senate parliamentarian, Elizabeth MacDonough, ruled that several provisions from the Senate committees on Banking, Environment and Public Works, and Armed Services violated the Byrd Rule and could not be included in a 50-vote reconciliation bill. The bill will no longer be able to include a funding cap on the Consumer Financial Protection Bureau, $1.4 billion in pay cuts to Federal Reserve staff, a $293 million cut in funding for the Office of Financial Research, the elimination of the Public Company Accounting Oversight Board, a repeal of portions of the Inflation Reduction Act, a repeal of the Environmental Protection Agency's "multipollutant emissions standards" for certain vehicles built after the 2026 model year, and a provision to cut funding for the Department of Defense if spending requests are not made on time. By June 24, the parliamentarian also ruled against a provision that would make it harder for a plaintiff to sue in order to impose injunctions or restraining orders against the federal government, a provision allowing states to conduct enforcement at the United States border, a provision forcing the United States Postal Service to sell electric vehicles, the REINS Act, a provision to allow developers to bypass environmental review by paying a fee, and a provision forcing states to pay at least 5% of SNAP costs. By June 27, the Parliamentarian had ruled against a provision to remove taxes on gun silencers and against a provision to expand Pell grants for short term training programs for workforces. On June 28, the Senate voted on a procedural motion to begin debate on the bill. Initially, fiscal conservatives Ron Johnson and Rand Paul, along with moderate Thom Tillis, voted against the motion, while fiscal conservatives Rick Scott, Mike Lee, and Cynthia Lummis, as well as moderate Lisa Murkowski, withheld their votes. After hours of negotiations, which resulted in Alaska specific provisions for Murkowski and Republican leadership support for an amendment vote that would result in increased Medicaid cuts targeted at the fiscal conservatives, Johnson, Scott, Lee, Lummis and Murkowski voted for the motion. The passage of the motion to proceed began the "vote-a-rama" process, in which senators can propose an unlimited number of amendments to the bill. Before it could begin, Democrats required the clerks of the Senate to read the entire 940 page bill in order to highlight Medicaid cuts. The vote-a-rama began two days later, on June 30, in the early morning. One of the few successful amendment votes, passing 99–1, removed the proposed AI law moratorium. The vote-a-rama set a record for the most amendment votes in Senate history. After an over 24-hour vote-a-rama, the bill passed the Senate on July 1, 2025, in a mostly party-line 51–50 vote. All Senate Democrats voted against the bill, and Republicans Rand Paul, Thom Tillis, and Susan Collins of Maine broke from their party to vote against the bill as well. Faced with a tie vote, Republican vice president JD Vance cast a tie-breaking vote in favor of the bill. The House of Representatives needed to pass the Senate version of the OBBBA for the bill to reach the President's desk. On July 1, 2025, President Trump and Senate majority leader Thune expressed confidence that the bill would pass in the House. House Republican moderates such as David Valadao and Young Kim of California, and Jeff Van Drew of New Jersey, who are against Medicaid cuts, Nick LaLota of New York, who is against SALT changes, and fiscal conservatives such as Chip Roy and Keith Self of Texas, who oppose federal deficit increases, had expressed opposition by June 30 to the bill in its then-current form. The House Rules Committee voted 7–6 on July 1, 2025, to advance the bill to the floor. Fiscal conservative Republicans Chip Roy and Ralph Norman voted against advancing the bill. Usually, the members of the majority party on the Rules Committee always vote to advance the bill to the floor. A procedural vote on July 2, 2025, while negotiations were ongoing off the House floor, was the longest vote in House history. In the early morning of July 3, 2025, the House approved the final procedural rule vote 219–213. The vote, which began on the evening of July 2, was initially opposed by five Republicans: moderate Brian Fitzpatrick of Pennsylvania and fiscal conservatives Victoria Spartz of Indiana, Andrew Clyde of Georgia, Keith Self of Texas, and Thomas Massie of Kentucky. Eight other fiscal conservative Republicans, including Tim Burchett of Tennessee and Chip Roy of Texas, withheld their votes. After hours of negotiations with President Trump and Speaker Johnson, all but Fitzpatrick flipped their votes to advance the rule. Starting at 4:52 a.m., House minority leader Hakeem Jeffries delivered a lengthy speech using the "magic minute" to delay the passage of the bill, eventually breaking the 8 hour and 32 minute record set by Kevin McCarthy in 2021. On July 3, the House of Representatives passed the Senate version of the OBBBA in a final mostly party-line vote of 218–214. Republican moderate Brian Fitzpatrick and fiscal conservative Thomas Massie, along with all Democrats, voted against the bill. On July 4, President Trump signed the bill into law at a ceremony at the White House. Removed provisions The following provisions were at one point included in the bill, but were removed: Additionally, many provisions in the House bill were removed to comply with the Byrd rule in the Senate. These included: Impact The Congressional Budget Office (CBO) initially estimated that the OBBBA would add $2.4 trillion to the national debt of the United States by 2034.[o] The CBO later raised the estimated increase in the budget deficit to $2.8 trillion. CBO estimates OBBBA would cause 10.9 million Americans to lose health insurance coverage.[p] The bill's cuts to Medicaid were the largest in the program's history and put rural hospitals at risk of closure with one clinic attributing their announced closure to the bill. The loss of coverage for millions of Americans is expected to strain the finances of hospitals, nursing homes, and community health centers, which will be left to absorb more of the cost of treating the uninsured. Further CBO analysis released August 11, 2025, estimated that the highest 10% of earners would see incomes rise by 2.7% by 2034 mainly due to tax cuts, while the lowest 10% would see incomes fall by 3.1% mainly due to cuts to programs such as Medicaid and food aid. Analysis of the bill by the CBO and multiple think tanks found it to be one of the most regressive bills in decades. The Center for a Responsible Federal Budget estimates that the bill will accelerate the estimated insolvency of Social Security and Medicare by one year. Experts have argued that the bill would create the largest upward transfer of wealth from the poor to the rich in American history due to large-scale benefit cuts paired with tax breaks for high-income earners and corporations. The bill was described by The New York Times as derailing renewable energy production and research in the United States, and possibly ceding the clean energy race to China. Its policies favor fossil fuel companies over renewable energy such as solar, wind, and EV manufacturing, and are expected to lead to large clean energy job losses, factory closures, and deter investment in clean technologies. Specifically, the law phases out most clean-energy tax incentives introduced under the Biden-area Inflation Reduction Act such as credits for low-carbon electricity (wind, solar), electric vehicle rebates, home electrification, clean hydrogen, and domestic manufacturing of batteries and solar panels. The law rescinds various IRA funds for grants related to freeway removal improving biking and walking in poorer neighborhoods, electric truck and bus manufacturing, faster state and local environmental reviews and place-based green industrial policy and home electrification. The U.S. government has allocated unprecedented funding to ICE for detention facilities, deportation operations, and additional funds to hire new agents. The law allocates ICE with more funding than any federal law enforcement agency in U.S. history, and more than the federal prison system. The expanded ICE funding is expected to lead to mass detentions and deportations, restricted access to asylum, and anticipated economic and humanitarian consequences. The law adds new accountability rules for colleges and expanded grant eligibility to short-term training programs, eliminates subsidized graduate loans, sets an annual limit on unsubsidized graduate loan amounts, and restructures income-driven repayment plans that could raise monthly payments and delay loan forgiveness. In K–12 education, it established the Federal Education Freedom Tax Credit Program, a federal tax credit for donations to private school scholarship funds. Critics warned the law could reduce college access for low-income and working students, divert public funds to private schools, and increase pressure on under-resourced school systems. Proponents characterized it as an important victory for school choice at the national level. Reception Multiple polls were conducted in June 2025 with general skepticism and disapproval from Americans. NPR noted that the bill's passage fulfilled several of Trump's campaign promises, but also violated his promise not to touch Medicaid benefits. CNN described its passage as made possible despite intraparty opposition as an example of "Trump's iron grip on his own party" and an "omnipresent" effort to get Republicans on board despite its unpopularity with the American public. According to the White House's website, whitehouse.gov, more than 200 organizations have stated their support for the OBBBA, including AT&T, Comcast, American Airlines, Delta Air Lines, the National Retail Federation, and the National Taxpayers Union. Trump has claimed that the bill is the "single most popular bill ever signed", a claim that CNN disputed, saying "That is an up-is-down reversal of reality. ... While polls can be off, this bill wouldn't be popular – let alone the most popular US bill ever signed – even with a massive and widespread polling error." The Atlantic, CNBC, The New York Times, and Vox argued that the bill would create the largest upward transfer of wealth from the poor to the rich in American history, with Fortune and CNN nicknaming it the "Reverse Robin Hood Bill", Senate Minority Leader Chuck Schumer (D-NY) mockingly called the bill the "We're All Going to Die Act", alluding to comments made by Republican Senator Joni Ernst (R-IA) at a town hall. Public health and policy researchers at Yale University and the University of Pennsylvania sent a letter to Senate leaders warning that cuts to health programs in the bill would lead to over 51,000 preventable deaths annually. Many Democratic and legal organizations have shared warnings about the expansion of immigration enforcement. Rep. Alexandria Ocasio-Cortez shared, "I don't think anyone is prepared for what they just did with ICE. This is not a simple budget increase. It is an explosion—making ICE bigger than the FBI, US Bureau of Prisons, DEA, and others combined. It is setting up to make what's happening now look like child's play. And people are disappearing." The nonpartisan think tank Energy Innovation found that the bill's efforts to dismantle clean energy incentives would cost more than 830,000 jobs across the country. Cutting clean energy incentives would also raise energy costs for households, with wholesale power prices rising by roughly fifty percent by 2035 due to the loss of new generation capacity. The tax cuts included in the bill are predicted to greatly increase the federal debt in proportion to the GDP of the U.S. economy. Among other destabilizing effects, this may increase the cost of government borrowing as bond buyers demand a higher interest rate on new debt. Moody's, which rates bonds, was the final of the three credit rating agencies to downgrade U.S. debt from AAA, citing efforts to pass the bill. On June 28, the Committee for a Responsible Federal Budget (CRFB) said of the Senate version of the bill: Although we have not produced a full estimate of the bill, it appears to add roughly $4 trillion to the debt through 2034, including interest – which is roughly $1 trillion higher than the House-passed version of the bill. That cost could rise above $5 trillion if temporary provisions were made permanent. Polling indicates that a majority of Americans opposed its previous provisions to ban state regulation of artificial intelligence. The provision was seen as irresponsible by researchers who believe that artificial superintelligence is imminent. Others feared that it would have prevented regulation of AI-generated child pornography and deepfakes, made certain privacy laws obsolete, and further centralized power in the federal government. Representative Marjorie Taylor Greene (R-GA) stated that she would have voted against the bill if it had returned to the House with the restrictions on AI legislation. Former close ally Elon Musk, then-de facto head of the Department of Government Efficiency (DOGE), denounced the bill as a massive spending bill; he later called it a "disgusting abomination". Some Republican senators have come out in support of Musk's opinion. Republican opposition to the bill has been associated with the libertarian faction of the party. As Rand Paul backed Musk's criticism of the bill, others have criticized Paul's Senate Homeland Security and Governmental Affairs Committee proposals for requiring new federal employees to be required to pay a higher FERS contribution rate if they opt for Title 5 benefits while "at will" employees would pay a lower FERS contribution rate. The concern is that the increase in the number of at-will federal employees could allow the president to eliminate a large number of employees for any reason. The bill is credited with starting a public feud between Musk and Trump. John Hatton, staff vice president for policy and programs at National Active and Retired Federal Employees Association (NARFE), warned about the following: It would tax retirement benefits, creating a 5% pay cut for somebody under the system, while also undermining the merit-based civil service by having an additional 5% cut if you decide to retain those merit-based civil service protections. Those protections don't exist for the purpose of the employee – they exist to protect against politically based firings of federal employees. American Federation of Government Employees (AFGE) national president Everett Kelley stated that: This so-called reconciliation bill is in fact a big retaliation bill—retaliation against AFGE and other unions for successfully standing up for our members and fighting this administration's illegal attempts to obliterate our federal agencies and the patriotic civil servants who run our federal programs. These provisions represent a direct assault on federal employees and their labor unions and will make it that much harder for federal agencies to recruit and retain the qualified employees they desperately need to serve the American public. The 2001 recipient of the Nobel Memorial Prize in Economic Sciences, Joseph Stiglitz, was asked about the OBBBA in an interview with Swiss Radio and Television (SRF) as to how he would describe the legislation, to which he had replied: Outrageous. It exacerbates inequality and social division—one of the main problems of the USA. It deprives vulnerable groups of access to health care. Life expectancy is already declining, and the health differences between rich and poor are enormous. This law exacerbates this. The nonpartisan Tax Foundation had mixed opinions of the bill, saying it made "some smart cuts", in particular praising the extension of the Tax Cuts and Jobs Act of 2017 which it argued would provide stability for households. It also expressed support for its impacts on counting international business income. It criticized the political nature of the bill, calling it filled with carve-outs and political gimmicks that increased the complexity of the tax code. It also criticized the bill's non-equal application of taxation on citizens. The Economist described the bill's policies and passage as an example of "America's creeping dysfunction", criticizing its impact on increasing the deficit and describing its tax cuts as "gimmicks". It also criticized Trump's handling of the economy more broadly, saying the bill "illustrates the long-term damage Mr Trump is doing to the foundations of America's economy" and describing its passage as exacerbating the effects of Trump's attacks on the Federal Reserve, defunding of scientific research, high tariff policy, and erosion to the rule of law. It described these cumulative effects as threatening America's economic stability and making it a riskier place to invest. The New York Times criticized Trump and his Republican allies' promotion of the bill, finding they made multiple false and misleading statements about the bill's impacts with inaccurate claims. It also described it as filled with "a series of novel, populist and temporary cuts that Mr. Trump cooked up during the 2024 campaign to try to win the support of key constituencies" and that it was ultimately an "apotheosis of a traditionally conservative, supply-side philosophy". It described it as "generating little additional economic growth and still returning the largest savings to the rich". It interviewed several conservative tax experts and former Republican aides who described it as "incoherent" and clinging to a traditional Republican economic agenda, only partially offering more temporary benefits to the working class paid for by cutting Medicaid and federal food assistance and refusing to raise taxes on the rich. Common misconceptions On July 3, Social Security Administration sent an email suggesting that federal income taxes on Social Security benefits would be eliminated under the bill, but tax experts stated the message was misleading. The law introduces a temporary $6,000 tax deduction for persons aged 65 and older with a certain income, which can reduce federal tax liability from that otherwise owed, but the law does not directly eliminate the taxes on Social Security benefits, which remain in effect under 26 U.S.C. § 86. All revenue from the taxation of Social Security benefits is earmarked for reinvestment into the Social Security Trust Fund, so the deduction would accelerate the insolvency of the Social Security benefits system by limiting this revenue stream. The No Tax on Tips provisions only reduce federal income tax liability and do not affect tax liability for purposes of the Federal Insurance Contributions Act, which funds Social Security and Medicare, or any other federal, state, or local tax law. The new provision is expected to benefit roughly two thirds of tipped workers. Workers would still need to report tips as taxable income, but the deduction can reduce the federal tax liability otherwise owed. The bill prompted claims that illegal immigrants receive Medicaid. Illegal immigrants are already ineligible for full Medicaid benefits under the Personal Responsibility and Work Opportunity Act, so many illegal immigrants access state-funded health programs instead. According to a CBO analysis, the bill's provisions could lead some states to cut back those state-funded health programs, potentially causing an estimated 1.4 million people to lose state-level health coverage, including illegal immigrants. When commenting on the bill's impact on the economy, U.S. secretary of agriculture Brooke Rollins stated that 34 million able-bodied adults on Medicaid should be able to replace the of farm workers who have been deported. According to the U.S. Government Accountability Office, roughly 70% of adults enrolled in Medicaid and Supplemental Nutrition Assistance Program work at least 35 hours per week; they qualify for assistance because they have low income rather than no income. Overall, it is estimated by The New York Times that only around 3% of Medicaid recipients are both able to work and long-term unemployed. Government shutdown After passing the OBBBA, Congress needed to approve a new spending bill to fund the federal government beyond October 1, 2025, when the previous budget expired. The 53 Republican senators had to either eliminate the filibuster or convince at least seven Democrats to join them in order to reach the 60-vote supermajority required to advance their proposal. Most Democrats opposed the Republican plan and requested a compromise that would extend the healthcare subsidies cut by the OBBBA. The resulting stalemate triggered the 2025 United States federal government shutdown, which became the longest government shutdown in U.S. history. See also Notes References External links |
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[SOURCE: https://en.wikipedia.org/wiki/American_Century] | [TOKENS: 2214] |
Contents American Century The American Century is a characterization of the period since the middle of the 20th century as being largely dominated by the United States in political, economic, technological, and cultural terms. It is comparable to the description of the period 1815–1914 as Britain's Imperial Century. The United States' influence grew throughout the 20th century, but became especially dominant after the end of World War II, when only two superpowers remained; the United States and the Soviet Union. After the dissolution of the Soviet Union in 1991, the United States remained the world's only superpower, and became the hegemon, or what some have termed a hyperpower. Origin of the phrase The term was coined by Time publisher Henry Luce to describe what he thought the role of the United States would be and should be during the 20th century. Luce, the son of a missionary, in a February 17, 1941, Life magazine editorial urged the United States to forsake isolationism for a missionary's role, acting as the world's Good Samaritan and spreading democracy. He called upon the US to enter World War II to defend democratic values: Throughout the 17th century and the 18th century and the 19th century, this continent teemed with manifold projects and magnificent purposes. Above them all and weaving them all together into the most exciting flag of all the world and of all history was the triumphal purpose of freedom. It is in this spirit that all of us are called, each to his own measure of capacity, and each in the widest horizon of his vision, to create the first great American Century. Democracy and other American ideals would "do their mysterious work of lifting the life of mankind from the level of the beasts to what the Psalmist called a little lower than the angels". Only under the American Century can the world "come to life in any nobility of health and vigor". According to David Harvey, Luce believed "the power conferred was global and universal rather than territorially specific, so Luce preferred to talk of an American century rather than an empire". In the same article he called upon United States "to exert upon the world the full impact of our influence, for such purposes as we see fit and by such means as we see fit". Early characteristics Beginning at the end of the 19th century, with the Spanish–American War in 1898 and the Boxer Rebellion, the United States began to play a more prominent role in the world beyond the North American continent. The government adopted protectionism after the Spanish–American War to develop its native industry and built up the navy, the "Great White Fleet". When Theodore Roosevelt became president in 1901, he accelerated a foreign policy shift away from isolationism and towards foreign involvement, a process which had begun under his predecessor William McKinley. For instance, the United States fought the Philippine–American War against the First Philippine Republic to solidify its control over the newly acquired Philippines. In 1904, Roosevelt committed the United States to building the Panama Canal, creating the Panama Canal Zone. Interventionism found its formal articulation in the 1904 Roosevelt Corollary to the Monroe Doctrine, proclaiming a right for the United States to intervene anywhere in the Americas, a moment that underlined the emergent US regional hegemony. After the outbreak of World War I in 1914, the United States pursued a policy of non-intervention, avoiding conflict while trying to broker a peace. President Woodrow Wilson later argued that the war was so important that the US had to have a voice in the peace conference. The United States was never formally a member of the Allies but entered the war in 1917 as a self-styled "Associated Power". Initially the United States had a small army, but, after the passage of the Selective Service Act, it drafted 2.8 million men, and, by summer 1918, was sending 10,000 fresh soldiers to France every day. The war ended in 1919 with the Treaty of Versailles. The United States then adopted a policy of isolationism, having refused to endorse the 1919 Versailles Treaty or formally enter the League of Nations. In 1916, the U.S. economy overtook that of the British Empire, becoming the world's largest economy. During the interwar period, economic protectionism took hold in the United States, particularly as a result of the Smoot–Hawley Tariff Act which is credited by economists with the prolonging and worldwide propagation of the Great Depression.: 33 From 1934, trade liberalization began to take place through the Reciprocal Trade Agreements Act. With the onset of World War II in 1939, Congress loosened the Neutrality Acts of 1930s but remained opposed to entering the European war. In 1940, the United States ranked 18th in terms of military power. The Neutrality Patrol had US destroyers fighting at sea, but no state of war had been declared by Congress. American public opinion remained isolationist. The 800,000-member America First Committee vehemently opposed any American intervention in the European conflict, even as the US sold military aid to the United Kingdom and the Soviet Union through the Lend-Lease program. In the 1941 State of the Union Address, known as the Four Freedoms speech, President Franklin D. Roosevelt made a break with the tradition of non-interventionism. He outlined the US role in helping allies already engaged in warfare. By August, President Roosevelt and British Prime Minister Winston Churchill had drafted the Atlantic Charter to define goals for the post-war world. In December 1941, Japan attacked American and British territories with near-simultaneous offensives against Southeast Asia and the Central Pacific including an attack on the US fleet at Pearl Harbor.. These attacks led the United States and United Kingdom to declare war on Japan. Three days later, Germany and Italy declared war on the United States, which the United States reciprocated. During the War, the Big Four powers (the United States, United Kingdom, the Soviet Union, and China) met to plan the post-war world. In an effort to maintain peace, the Allies formed the United Nations, which came into existence on October 24, 1945, and adopted the Universal Declaration of Human Rights in 1948, as a common standard for all member states. The United States worked closely with the United Kingdom to establish the IMF, World Bank and NATO. Pax Americana Pax Americana represents the relative peace in the Western world, resulting in part from the preponderance of power enjoyed by the United States of America starting around the middle of the 20th century. Although the term finds its primary utility in the late 20th century, it has been used in other times in the 20th century. Its modern connotations concern the peace established after the end of World War II in 1945. Post-1945 characteristics The American Century existed through the Cold War and demonstrated the status of the United States as the foremost of the world's two superpowers. After the Cold War, the most common belief held that only the United States fulfilled the criteria to be considered a superpower. Its geographic area composed the fourth-largest state in the world, with an area of approximately 9.37 million km2. The population of the US was 248.7 million in 1990, at that time the fourth-largest nation. In the mid-to-late 20th century, the political status of the US was defined as a strongly capitalist federation and constitutional republic. It had a permanent seat on the United Nations Security Council plus two allies with permanent seats, the United Kingdom and France. The US had strong ties with capitalist Western Europe, Latin America, British Commonwealth, and several East Asian countries (Korea, Taiwan, Japan). It allied itself with both right-wing dictatorships and capitalist democracies. The American Century includes the political influence of the United States but also its economic influence. Many states around the world would, over the course of the 20th century, adopt the economic policies of the Washington Consensus, sometimes against the wishes of their populations. The economic force of the US was powerful at the end of the century due to it being by far the largest economy in the world. The US had large resources of minerals, energy resources, metals, and timber, a large and modernized farming industry and large industrial base. The United States dollar is the dominant world reserve currency under the Bretton Woods system. US systems were rooted in capitalist economic theory based on supply and demand, that is, production determined by customers' demands. The US was allied with the G7 major economies. US economic policy prescriptions were the "standard" reform packages promoted for crisis-wracked developing countries by Washington, DC–based international institutions such as the International Monetary Fund (IMF), World Bank, as well as the US Treasury Department. The military of the United States was a naval-based advanced military with by far the highest military expenditure in the world. The United States Navy is the world's largest navy, with the largest number of aircraft carriers, bases all over the world (particularly in an incomplete "ring" bordering the Warsaw Pact states to the west, south and east). The US had the largest nuclear arsenal in the world during the first half of the Cold War, one of the largest armies in the world and one of the two largest air forces in the world. Its powerful military allies in Western Europe (the North Atlantic Treaty Organization states) had their own nuclear capabilities. The US also possessed a powerful global intelligence network in the Central Intelligence Agency. The cultural effect of the US, often known as Americanization, is seen in the influence on other countries of US music, TV, films, art, and fashion, as well as the desire for freedom of speech and other guaranteed rights its residents enjoy. US pop stars such as Elvis Presley, Michael Jackson, and Madonna have become global celebrities. Criticism and usage Critics have condemned Luce's "jingoistic missionary zeal". Others have noted the end of the 20th century and the American Century, most famously the late gonzo journalist Hunter S. Thompson who titled his 2003 autobiography Kingdom of Fear: Loathsome Secrets of a Star Crossed Child in the Last Days of the American Century. With the advent of the new millennium, critics from the University of Illinois stated that it was a matter of debate whether the US was losing its superpower status, especially in relation to China's rise. Other analysts have made the case for the "American Century" fitting neatly between the US's late entry into World War I in 1917 and the inauguration of the isolationist presidency of Donald Trump in 2017. See also References Bibliography Further reading External links |
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[SOURCE: https://en.wikipedia.org/wiki/Wireless_community_network] | [TOKENS: 3105] |
Contents Wireless community network Wireless community networks or wireless community projects or simply community networks, are decentralized, self-managed and collaborative computer networks organized in a grassroots fashion by communities, non-governmental organizations and cooperatives in order to provide a viable alternative to municipal wireless networks for consumers. Many of these organizations set up wireless mesh networks which rely primarily on sharing of unmetered residential and business DSL and cable Internet. This sort of usage might be non-compliant with the terms of service of local internet service provider (ISPs) that deliver their service via the consumer phone and cable duopoly. Wireless community networks sometimes advocate complete freedom from censorship, and this position may be at odds with the acceptable use policies of some commercial services used. Some ISPs do allow sharing or reselling of bandwidth. The First Latin American Summit of Community Networks, held in Argentina in 2018, presented the following definition for the term "community network": "Community networks are networks collectively owned and managed by the community for non-profit and community purposes. They are constituted by collectives, indigenous communities or non-profit civil society organizations that exercise their right to communicate, under the principles of democratic participation of their members, fairness, gender equality, diversity and plurality". According to the Declaration on Community Connectivity, elaborated through a multistakeholder process organized by the Internet Governance Forum's Dynamic Coalition on Community Connectivity, community networks are recognised by a list of characteristics: Collective ownership; Social management; Open design; Open participation; Promotion of peering and transit; Promotion of the consideration of security and privacy concerns while designing and operating the network; and promotion of the development and circulation of local content in local languages. History Wireless community networks started as projects that evolved from amateur radio using packet radio, and from the free software community which substantially overlapped with the amateur radio community.[citation needed] Wireless neighborhood networks were established by technology enthusiasts in the early 2000s. The Redbricks Intranet Collective (RIC) started 1999 in Manchester, UK, to allow about 30 flats in the Bentley House Estate to share the subscription cost of one leased line from British Telecom (BT). Wi-Fi was quickly adopted by technology enthusiasts and hobbyists, because it was an open standard and consumer Wi-Fi hardware was comparatively cheap. Wireless community networks started out by turning wireless access points designed for short-range use in homes into multi-kilometre long-range Wi-Fi by building high-gain directional antennas. Rather than buying commercially available units, some of the early groups advocated home-built antennas. Examples include the cantenna and RONJA, an optical link that can be made from a smoke flue and LEDs. The circuitry and instructions for such DIY networking antennas were released under the GNU Free Documentation License (GFDL). Municipal wireless networks, funded by local governments, started being deployed from 2003 onward. Regarding the international policy scenario, discussions on Community Networks have gained prominence over the last few years, especially since the creation of the Internet Governance Forum's Dynamic Coalition on Community Connectivity in 2016, providing "a much needed platform through which various individuals and entities interested in the advancement of CNs have the possibility to associate, organise and develop, in a bottom-up participatory fashion collective 'principles, rules, decision-making procedures and shared programs that give shape to the evolution and use of the Internet.'". By 2003, a number of wireless community projects had established themselves in urban areas across North America, Europe and Australia. In June 2000, Melbourne Wireless Inc. was established in Melbourne Australia as a not-for-profit project to establish a metropolitan area wireless network using off-the-shelf 802.11 wireless equipment. By 2003, it had 1,200 hotspots. In 2000 Seattle Wireless was founded with the stated aim of providing free WiFi access and share the cost of Internet connectivity in Seattle, USA. By April 2011, it had 80 free wireless access points all over Seattle and was steadily growing. In August 2000, Consume was founded in London England as "collaborative strategy for the self provisioning of a broadband telecommunications infrastructure". Founded by Ben Laurie and others, Consume aimed to build a wireless infrastructure as alternative to the monopoly-held wired metropolitan area network. Besides providing Wi-Fi access in East London, Consume installed a large antenna on the roof of the former Greenwich Town Hall and documented the states of wireless connections in London. Consume created political pressure on municipal authorities, by staging public events, exhibitions, encouraging consumers to set up wireless equipment and setting up temporary Wi-Fi hotspots at events in East London. While Consume generated sustained media attention, it did not establish a lasting wireless community network. The Wireless Leiden hobbyist project was established in September 2001 and constituted as non-profit foundation in 2003 with more than 300 active users. The Wireless Leiden foundation aimed to facilitate the cooperation of local government, businesses and residents to provide wireless networking in Leiden Netherlands. The first wireless community network in Spain was RedLibre, founded in September 2001 in Madrid. By 2002 RedLibre coordinated the efforts of 15 local wireless groups and maintained free RedLibre Wi-Fi hotspots in five cities. RedLibre has been credited for facilitating the widespread availability of WLAN in the urban areas of Spain. In Italy, Ninux.org was founded by students and hackers in 2001 to create a grassroots wireless network in Rome, similar to Seattle Wireless. A turning point for Ninux was the lowering of prices in 2008 for consumer wireless equipment, such as antennas and routers. Ninux volunteers installed an increasing number of antennas on the roofs of Rome. The network served as example for other urban community wireless networks in Italy. By 2016, similar wireless networks had been installed in Florence, Bolongna, Pisa and Cosenza. While they share common technical and organizational frameworks, the working groups supporting these urban wireless community networks are driven by the different needs of the city in which they operate. Houston Wireless was founded in summer 2001 as the Houston Wireless Users Group. The telecommunications providers were slow to roll out third-generation wireless (3G), so Houston Wireless was established to promote high-speed wireless access across Houston and its suburbs. Houston Wireless experimented with network protocols such as IPsec, mobile IP and IPv6, as well as wireless technologies, including 802.11a, 802.11g and ultra-wideband (UWB). By 2003, it had 30 WLAN hotspots, 100 people on their mailing lists and their monthly meetings were attended by about 25 people. NYCwireless was established in New York City in May 2001 to provide public hotspots and promote the use of consumer owned unlicensed low-cost wireless networking equipment. In order to get more public Wi-Fi hotspots installed, NYCwirelsss contracted with the for-profit company Cloud Networks, which was staffed by some of the founding members of the NYCwireless community project. In the aftermath of the September 11 attacks in 2001 NYCwirelsss helped to provide emergency communication by quickly assembling and deploying free Wi-Fi hotspots in areas of New York City that had no other telecommunications. In summer 2002, the Bryant Park wireless network became the flagship project of NYCwireless, with about 50 users every day. By 2003 NYCwireless had more than 100 active hotspots throughout New York City. In 2000, guifi.net was founded because commercial internet service providers did not build a broadband Internet infrastructure in rural Catalonia. Guifi.net was conceived as a wireless mesh network, where households can become a node in the network by operating a radio transmitter. Not every node needs to be a wireless router, but the network relies on some volunteers being connected to the Internet and sharing that access with others. In 2017 guifi.net had 23,000 nodes and was described as the biggest mesh network in the world. In 2001, BCWireless founded to help communities in British Columbia, Canada, set up local Wi-Fi networks. BCWireless hobbyists experimented with IEEE 802.11b wireless networks and antennas to extend the range and power of signal, allow bandwidth sharing among local group members and establish wireless mesh networks. The Lac Seul First Nation communities set up their Wi-Fi network and constituted the non-profit K-Net to manage a wireless network based on IEEE 802.11g to provide the entire reserve with Wi-Fi using the unlicensed spectrum in combination with licensed spectrum at 3.5 GHz. For the most, early wireless community projects had a local scope, but many still had a global awareness. In 2003, wireless community networks initiated the Pico Peering Agreement (PPA) and the Wireless Commons Manifesto. The two initiatives defined attempts to build an infrastructure, so that local wireless mesh networks could become extensive wireless ad hoc networks across local and national boundaries. In 2004, Freifunk released the OpenWrt-based firmware FFF for Wi-Fi devices that participate in a community network, which included a PPA, so that the owner of the node agrees to provide free transit across the network. Technical approach There are at least three technical approaches to building a wireless community network: Wireless equipment, like many other consumer electronics, comes with hard-to-alter firmware that is preinstalled by the manufacturer. When the Linksys WRT54G series was launched in 2003 with an open source Linux kernel as firmware, it immediately became the subject of hacks and became the most popular hardware among community wireless volunteers. In 2005, Linksys released the WRT54GL version of its firmware, to make it even easier for customers to modify it. Community network hackers experimented with increasing the transmission power of the Linksys WRT54G or increasing the clock speed of the CPU to speed up data transmission. Hobbyists got another boost when in 2004 the OpenWrt firmware was released as open source alternative to proprietary firmware. The Linux-based embedded operating system could be used on embedded devices to route network traffic. Through successive versions, OpenWrt eventually could work on several hundred types of wireless devices and Wi-Fi routers. OpenWrt was named in honor of the WRT54G. The OpenWrt developers provided extensive documentation and the ability to include one's own code in the OpenWrt source code and compile the firmware. In 2004, Freifunk released the FFF firmware for wireless community projects, which modified OpenWrt so that the node could be configured via a web interface and added features to better support a wireless ad hoc network with traffic shaping, statistics, Internet gateway support and an implementation of the Optimized Link State Routing Protocol (OLSR). A Wi-Fi access point that booting the FFF firmware joined the network by automatically announcing its Internet gateway capabilities to other nodes using OLSR HNA4. When a node disappeared, the other nodes registered the change in the network topology through the discontinuation of HNA4 announcements. At the time, Freifunk in Berlin had 500 Wi-Fi access points and about 2,200 Berlin residents used the network free of charge. The Freifunk FFF firmware is among the oldest approaches to establishing a wireless mesh network at significant scale. Other early attempts at developing an operating system for wireless devices that supported large scale wireless community projects were Open-Mesh and Netsukuku. In 2006, Meraki Networks Inc was founded. The Meraki hardware and firmware had been developed as part of a PhD research project at the Massachusetts Institute of Technology to provide wireless access to graduate students. For years, the low-cost Meraki products fueled the growth of wireless mesh networks in 25 countries. Early Meraki-based wireless community networks included the Free-the-Net Meraki mesh in Vancouver, Canada. Constituted in 2006 as legal co-operative, members of the Vancouver Open Network Initiatives Cooperative paid five Canadian dollars per month to access the community wireless network provided by individuals who attached Meraki nodes to their home wireless connection, sharing bandwidth with any cooperative members nearby and participating in a meshed wireless network. By 2003, the Sidney Wireless community project had launched the NodeDB software, to facilitate the work of community networks by mapping the nodes participating in a wireless mesh network. Nodes needed to be registered in the database, but the software generated a list of adjacent nodes. When registering a node that participated in a community network, the maintainer of the node could leave a note on the hardware, antenna reach and firmware in operation and so find other network community members who were willing to participate in a mesh. Organization Organizationally, a wireless community network requires either a set of affordable commercial technical solutions or a critical mass of hobbyists willing to tinker to maintain operations. Mesh networks require that a high level of community participation and commitment be maintained for the network to be viable. The mesh approach currently requires uniform equipment. One market-driven aspect of the mesh approach is that users who receive a weak mesh signal can often convert it to a strong signal by obtaining and operating a repeater node, thus extending the network. [citation needed] Such volunteer organizations focusing on technology that is rapidly advancing sometimes have schisms and mergers.[citation needed] The Wi-Fi service provided by such groups is usually free and without the stigma of piggybacking. An alternative to the voluntary model is to use a co-operative structure. Wireless community projects made volunteer bandwidth-sharing technically feasible and have been credited with contributing to the emergence of alternative business models in the consumer Wi-Fi market. The commercial Wi-Fi provider Fon was established in 2006 in Spain. Fon customers were equipped with a Linksys Wi-Fi access point that runs a modified OpenWrt firmware so that Fon customers shared Wi-Fi access among each other. Public Wi-Fi provisioning through FON customers was broadened when FON entered a 50% revenue-sharing agreement with customers who made their entire unused bandwidth available for resale. In 2009, this business model gained broader acceptance when British Telecom allowed its own home customers to sell unused bandwidth to BT and FON roamers. Wireless community projects for the most provide best-effort Wi-Fi coverage. However, since the mid-2000s local authorities started to contract with wireless community networks to provide municipal wireless networks or stable Wi-Fi access in a defined urban area, such as a park. Wireless community networks started to participate in a variety of public-private partnerships. The non-profit community network ZAP Sherbrooke has partnered with public and private entities to provide Wi-Fi access and received financial support from the University of Sherbrooke and Bishop's University to extend the coverage of its wireless mesh throughout the city of Sherbrooke, Canada. Regulation Certain countries regulate the selling of internet access, requiring a license to sell internet access over a wireless network. In South Africa it is regulated by the Independent Communications Authority of South Africa (ICASA). They require that WISP's apply for a VANS or ECNS/ECS license before being allowed to resell internet access over a wireless link. The Internet Society's publication "Community Networks in Latin America: Challenges, Regulations and Solutions" brings a summary of regulations regarding Community Networks among Latin American countries, the United States and Canada. See also References |
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[SOURCE: https://en.wikipedia.org/wiki/OpenAI#cite_ref-17] | [TOKENS: 8773] |
Contents OpenAI OpenAI is an American artificial intelligence research organization comprising both a non-profit foundation and a controlled for-profit public benefit corporation (PBC), headquartered in San Francisco. It aims to develop "safe and beneficial" artificial general intelligence (AGI), which it defines as "highly autonomous systems that outperform humans at most economically valuable work". OpenAI is widely recognized for its development of the GPT family of large language models, the DALL-E series of text-to-image models, and the Sora series of text-to-video models, which have influenced industry research and commercial applications. Its release of ChatGPT in November 2022 has been credited with catalyzing widespread interest in generative AI. The organization was founded in 2015 in Delaware but evolved a complex corporate structure. As of October 2025, following restructuring approved by California and Delaware regulators, the non-profit OpenAI Foundation holds 26% of the for-profit OpenAI Group PBC, with Microsoft holding 27% and employees/other investors holding 47%. Under its governance arrangements, the OpenAI Foundation holds the authority to appoint the board of the for-profit OpenAI Group PBC, a mechanism designed to align the entity’s strategic direction with the Foundation’s charter. Microsoft previously invested over $13 billion into OpenAI, and provides Azure cloud computing resources. In October 2025, OpenAI conducted a $6.6 billion share sale that valued the company at $500 billion. In 2023 and 2024, OpenAI faced multiple lawsuits for alleged copyright infringement against authors and media companies whose work was used to train some of OpenAI's products. In November 2023, OpenAI's board removed Sam Altman as CEO, citing a lack of confidence in him, but reinstated him five days later following a reconstruction of the board. Throughout 2024, roughly half of then-employed AI safety researchers left OpenAI, citing the company's prominent role in an industry-wide problem. Founding In December 2015, OpenAI was founded as a not for profit organization by Sam Altman, Elon Musk, Ilya Sutskever, Greg Brockman, Trevor Blackwell, Vicki Cheung, Andrej Karpathy, Durk Kingma, John Schulman, Pamela Vagata, and Wojciech Zaremba, with Sam Altman and Elon Musk as the co-chairs. A total of $1 billion in capital was pledged by Sam Altman, Greg Brockman, Elon Musk, Reid Hoffman, Jessica Livingston, Peter Thiel, Amazon Web Services (AWS), and Infosys. However, the actual capital collected significantly lagged pledges. According to company disclosures, only $130 million had been received by 2019. In its founding charter, OpenAI stated an intention to collaborate openly with other institutions by making certain patents and research publicly available, but later restricted access to its most capable models, citing competitive and safety concerns. OpenAI was initially run from Brockman's living room. It was later headquartered at the Pioneer Building in the Mission District, San Francisco. According to OpenAI's charter, its founding mission is "to ensure that artificial general intelligence (AGI)—by which we mean highly autonomous systems that outperform humans at most economically valuable work—benefits all of humanity." Musk and Altman stated in 2015 that they were partly motivated by concerns about AI safety and existential risk from artificial general intelligence. OpenAI stated that "it's hard to fathom how much human-level AI could benefit society", and that it is equally difficult to comprehend "how much it could damage society if built or used incorrectly". The startup also wrote that AI "should be an extension of individual human wills and, in the spirit of liberty, as broadly and evenly distributed as possible", and that "because of AI's surprising history, it's hard to predict when human-level AI might come within reach. When it does, it'll be important to have a leading research institution which can prioritize a good outcome for all over its own self-interest." Co-chair Sam Altman expected a decades-long project that eventually surpasses human intelligence. Brockman met with Yoshua Bengio, one of the "founding fathers" of deep learning, and drew up a list of great AI researchers. Brockman was able to hire nine of them as the first employees in December 2015. OpenAI did not pay AI researchers salaries comparable to those of Facebook or Google. It also did not pay stock options which AI researchers typically get. Nevertheless, OpenAI spent $7 million on its first 52 employees in 2016. OpenAI's potential and mission drew these researchers to the firm; a Google employee said he was willing to leave Google for OpenAI "partly because of the very strong group of people and, to a very large extent, because of its mission." OpenAI co-founder Wojciech Zaremba stated that he turned down "borderline crazy" offers of two to three times his market value to join OpenAI instead. In April 2016, OpenAI released a public beta of "OpenAI Gym", its platform for reinforcement learning research. Nvidia gifted its first DGX-1 supercomputer to OpenAI in August 2016 to help it train larger and more complex AI models with the capability of reducing processing time from six days to two hours. In December 2016, OpenAI released "Universe", a software platform for measuring and training an AI's general intelligence across the world's supply of games, websites, and other applications. Corporate structure In 2019, OpenAI transitioned from non-profit to "capped" for-profit, with the profit being capped at 100 times any investment. According to OpenAI, the capped-profit model allows OpenAI Global, LLC to legally attract investment from venture funds and, in addition, to grant employees stakes in the company. Many top researchers work for Google Brain, DeepMind, or Facebook, which offer equity that a nonprofit would be unable to match. Before the transition, OpenAI was legally required to publicly disclose the compensation of its top employees. The company then distributed equity to its employees and partnered with Microsoft, announcing an investment package of $1 billion into the company. Since then, OpenAI systems have run on an Azure-based supercomputing platform from Microsoft. OpenAI Global, LLC then announced its intention to commercially license its technologies. It planned to spend $1 billion "within five years, and possibly much faster". Altman stated that even a billion dollars may turn out to be insufficient, and that the lab may ultimately need "more capital than any non-profit has ever raised" to achieve artificial general intelligence. The nonprofit, OpenAI, Inc., is the sole controlling shareholder of OpenAI Global, LLC, which, despite being a for-profit company, retains a formal fiduciary responsibility to OpenAI, Inc.'s nonprofit charter. A majority of OpenAI, Inc.'s board is barred from having financial stakes in OpenAI Global, LLC. In addition, minority members with a stake in OpenAI Global, LLC are barred from certain votes due to conflict of interest. Some researchers have argued that OpenAI Global, LLC's switch to for-profit status is inconsistent with OpenAI's claims to be "democratizing" AI. On February 29, 2024, Elon Musk filed a lawsuit against OpenAI and CEO Sam Altman, accusing them of shifting focus from public benefit to profit maximization—a case OpenAI dismissed as "incoherent" and "frivolous," though Musk later revived legal action against Altman and others in August. On April 9, 2024, OpenAI countersued Musk in federal court, alleging that he had engaged in "bad-faith tactics" to slow the company's progress and seize its innovations for his personal benefit. OpenAI also argued that Musk had previously supported the creation of a for-profit structure and had expressed interest in controlling OpenAI himself. The countersuit seeks damages and legal measures to prevent further alleged interference. On February 10, 2025, a consortium of investors led by Elon Musk submitted a $97.4 billion unsolicited bid to buy the nonprofit that controls OpenAI, declaring willingness to match or exceed any better offer. The offer was rejected on 14 February 2025, with OpenAI stating that it was not for sale, but the offer complicated Altman's restructuring plan by suggesting a lower bar for how much the nonprofit should be valued. OpenAI, Inc. was originally designed as a nonprofit in order to ensure that AGI "benefits all of humanity" rather than "the private gain of any person". In 2019, it created OpenAI Global, LLC, a capped-profit subsidiary controlled by the nonprofit. In December 2024, OpenAI proposed a restructuring plan to convert the capped-profit into a Delaware-based public benefit corporation (PBC), and to release it from the control of the nonprofit. The nonprofit would sell its control and other assets, getting equity in return, and would use it to fund and pursue separate charitable projects, including in science and education. OpenAI's leadership described the change as necessary to secure additional investments, and claimed that the nonprofit's founding mission to ensure AGI "benefits all of humanity" would be better fulfilled. The plan has been criticized by former employees. A legal letter named "Not For Private Gain" asked the attorneys general of California and Delaware to intervene, stating that the restructuring is illegal and would remove governance safeguards from the nonprofit and the attorneys general. The letter argues that OpenAI's complex structure was deliberately designed to remain accountable to its mission, without the conflicting pressure of maximizing profits. It contends that the nonprofit is best positioned to advance its mission of ensuring AGI benefits all of humanity by continuing to control OpenAI Global, LLC, whatever the amount of equity that it could get in exchange. PBCs can choose how they balance their mission with profit-making. Controlling shareholders have a large influence on how closely a PBC sticks to its mission. On October 28, 2025, OpenAI announced that it had adopted the new PBC corporate structure after receiving approval from the attorneys general of California and Delaware. Under the new structure, OpenAI's for-profit branch became a public benefit corporation known as OpenAI Group PBC, while the non-profit was renamed to the OpenAI Foundation. The OpenAI Foundation holds a 26% stake in the PBC, while Microsoft holds a 27% stake and the remaining 47% is owned by employees and other investors. All members of the OpenAI Group PBC board of directors will be appointed by the OpenAI Foundation, which can remove them at any time. Members of the Foundation's board will also serve on the for-profit board. The new structure allows the for-profit PBC to raise investor funds like most traditional tech companies, including through an initial public offering, which Altman claimed was the most likely path forward. In January 2023, OpenAI Global, LLC was in talks for funding that would value the company at $29 billion, double its 2021 value. On January 23, 2023, Microsoft announced a new US$10 billion investment in OpenAI Global, LLC over multiple years, partially needed to use Microsoft's cloud-computing service Azure. From September to December, 2023, Microsoft rebranded all variants of its Copilot to Microsoft Copilot, and they added MS-Copilot to many installations of Windows and released Microsoft Copilot mobile apps. Following OpenAI's 2025 restructuring, Microsoft owns a 27% stake in the for-profit OpenAI Group PBC, valued at $135 billion. In a deal announced the same day, OpenAI agreed to purchase $250 billion of Azure services, with Microsoft ceding their right of first refusal over OpenAI's future cloud computing purchases. As part of the deal, OpenAI will continue to share 20% of its revenue with Microsoft until it achieves AGI, which must now be verified by an independent panel of experts. The deal also loosened restrictions on both companies working with third parties, allowing Microsoft to pursue AGI independently and allowing OpenAI to develop products with other companies. In 2017, OpenAI spent $7.9 million, a quarter of its functional expenses, on cloud computing alone. In comparison, DeepMind's total expenses in 2017 were $442 million. In the summer of 2018, training OpenAI's Dota 2 bots required renting 128,000 CPUs and 256 GPUs from Google for multiple weeks. In October 2024, OpenAI completed a $6.6 billion capital raise with a $157 billion valuation including investments from Microsoft, Nvidia, and SoftBank. On January 21, 2025, Donald Trump announced The Stargate Project, a joint venture between OpenAI, Oracle, SoftBank and MGX to build an AI infrastructure system in conjunction with the US government. The project takes its name from OpenAI's existing "Stargate" supercomputer project and is estimated to cost $500 billion. The partners planned to fund the project over the next four years. In July, the United States Department of Defense announced that OpenAI had received a $200 million contract for AI in the military, along with Anthropic, Google, and xAI. In the same month, the company made a deal with the UK Government to use ChatGPT and other AI tools in public services. OpenAI subsequently began a $50 million fund to support nonprofit and community organizations. In April 2025, OpenAI raised $40 billion at a $300 billion post-money valuation, which was the highest-value private technology deal in history. The financing round was led by SoftBank, with other participants including Microsoft, Coatue, Altimeter and Thrive. In July 2025, the company reported annualized revenue of $12 billion. This was an increase from $3.7 billion in 2024, which was driven by ChatGPT subscriptions, which reached 20 million paid subscribers by April 2025, up from 15.5 million at the end of 2024, alongside a rapidly expanding enterprise customer base that grew to five million business users. The company’s cash burn remains high because of the intensive computational costs required to train and operate large language models. It projects an $8 billion operating loss in 2025. OpenAI reports revised long-term spending projections totaling approximately $115 billion through 2029, with annual expenditures projected to escalate significantly, reaching $17 billion in 2026, $35 billion in 2027, and $45 billion in 2028. These expenditures are primarily allocated toward expanding compute infrastructure, developing proprietary AI chips, constructing data centers, and funding intensive model training programs, with more than half of the spending through the end of the decade expected to support research-intensive compute for model training and development. The company's financial strategy prioritizes market expansion and technological advancement over near-term profitability, with OpenAI targeting cash-flow-positive operations by 2029 and projecting revenue of approximately $200 billion by 2030. This aggressive spending trajectory underscores both the enormous capital requirements of scaling cutting-edge AI technology and OpenAI's commitment to maintaining its position as a leader in the artificial intelligence industry. In October 2025, OpenAI completed an employee share sale of up to $10 billion to existing investors which valued the company at $500 billion. The deal values OpenAI as the most valuable privately owned company in the world—surpassing SpaceX as the world's most valuable private company. On November 17, 2023, Sam Altman was removed as CEO when its board of directors (composed of Helen Toner, Ilya Sutskever, Adam D'Angelo and Tasha McCauley) cited a lack of confidence in him. Chief Technology Officer Mira Murati took over as interim CEO. Greg Brockman, the president of OpenAI, was also removed as chairman of the board and resigned from the company's presidency shortly thereafter. Three senior OpenAI researchers subsequently resigned: director of research and GPT-4 lead Jakub Pachocki, head of AI risk Aleksander Mądry, and researcher Szymon Sidor. On November 18, 2023, there were reportedly talks of Altman returning as CEO amid pressure placed upon the board by investors such as Microsoft and Thrive Capital, who objected to Altman's departure. Although Altman himself spoke in favor of returning to OpenAI, he has since stated that he considered starting a new company and bringing former OpenAI employees with him if talks to reinstate him didn't work out. The board members agreed "in principle" to resign if Altman returned. On November 19, 2023, negotiations with Altman to return failed and Murati was replaced by Emmett Shear as interim CEO. The board initially contacted Anthropic CEO Dario Amodei (a former OpenAI executive) about replacing Altman, and proposed a merger of the two companies, but both offers were declined. On November 20, 2023, Microsoft CEO Satya Nadella announced Altman and Brockman would be joining Microsoft to lead a new advanced AI research team, but added that they were still committed to OpenAI despite recent events. Before the partnership with Microsoft was finalized, Altman gave the board another opportunity to negotiate with him. About 738 of OpenAI's 770 employees, including Murati and Sutskever, signed an open letter stating they would quit their jobs and join Microsoft if the board did not rehire Altman and then resign. This prompted OpenAI investors to consider legal action against the board as well. In response, OpenAI management sent an internal memo to employees stating that negotiations with Altman and the board had resumed and would take some time. On November 21, 2023, after continued negotiations, Altman and Brockman returned to the company in their prior roles along with a reconstructed board made up of new members Bret Taylor (as chairman) and Lawrence Summers, with D'Angelo remaining. According to subsequent reporting, shortly before Altman’s firing, some employees raised concerns to the board about how he had handled the safety implications of a recent internal AI capability discovery. On November 29, 2023, OpenAI announced that an anonymous Microsoft employee had joined the board as a non-voting member to observe the company's operations; Microsoft resigned from the board in July 2024. In February 2024, the Securities and Exchange Commission subpoenaed OpenAI's internal communication to determine if Altman's alleged lack of candor misled investors. In 2024, following the temporary removal of Sam Altman and his return, many employees gradually left OpenAI, including most of the original leadership team and a significant number of AI safety researchers. In August 2023, it was announced that OpenAI had acquired the New York-based start-up Global Illumination, a company that deploys AI to develop digital infrastructure and creative tools. In June 2024, OpenAI acquired Multi, a startup focused on remote collaboration. In March 2025, OpenAI reached a deal with CoreWeave to acquire $350 million worth of CoreWeave shares and access to AI infrastructure, in return for $11.9 billion paid over five years. Microsoft was already CoreWeave's biggest customer in 2024. Alongside their other business dealings, OpenAI and Microsoft were renegotiating the terms of their partnership to facilitate a potential future initial public offering by OpenAI, while ensuring Microsoft's continued access to advanced AI models. On May 21, OpenAI announced the $6.5 billion acquisition of io, an AI hardware start-up founded by former Apple designer Jony Ive in 2024. In September 2025, OpenAI agreed to acquire the product testing startup Statsig for $1.1 billion in an all-stock deal and appointed Statsig's founding CEO Vijaye Raji as OpenAI's chief technology officer of applications. The company also announced development of an AI-driven hiring service designed to rival LinkedIn. OpenAI acquired personal finance app Roi in October 2025. In October 2025, OpenAI acquired Software Applications Incorporated, the developer of Sky, a macOS-based natural language interface designed to operate across desktop applications. The Sky team joined OpenAI, and the company announced plans to integrate Sky’s capabilities into ChatGPT. In December 2025, it was announced OpenAI had agreed to acquire Neptune, an AI tooling startup that helps companies track and manage model training, for an undisclosed amount. In January 2026, it was announced OpenAI had acquired healthcare technology startup Torch for approximately $60 million. The acquisition followed the launch of OpenAI’s ChatGPT Health product and was intended to strengthen the company’s medical data and healthcare artificial intelligence capabilities. OpenAI has been criticized for outsourcing the annotation of data sets to Sama, a company based in San Francisco that employed workers in Kenya. These annotations were used to train an AI model to detect toxicity, which could then be used to moderate toxic content, notably from ChatGPT's training data and outputs. However, these pieces of text usually contained detailed descriptions of various types of violence, including sexual violence. The investigation uncovered that OpenAI began sending snippets of data to Sama as early as November 2021. The four Sama employees interviewed by Time described themselves as mentally scarred. OpenAI paid Sama $12.50 per hour of work, and Sama was redistributing the equivalent of between $1.32 and $2.00 per hour post-tax to its annotators. Sama's spokesperson said that the $12.50 was also covering other implicit costs, among which were infrastructure expenses, quality assurance and management. In 2024, OpenAI began collaborating with Broadcom to design a custom AI chip capable of both training and inference, targeted for mass production in 2026 and to be manufactured by TSMC on a 3 nm process node. This initiative intended to reduce OpenAI's dependence on Nvidia GPUs, which are costly and face high demand in the market. In January 2024, Arizona State University purchased ChatGPT Enterprise in OpenAI's first deal with a university. In June 2024, Apple Inc. signed a contract with OpenAI to integrate ChatGPT features into its products as part of its new Apple Intelligence initiative. In June 2025, OpenAI began renting Google Cloud's Tensor Processing Units (TPUs) to support ChatGPT and related services, marking its first meaningful use of non‑Nvidia AI chips. In September 2025, it was revealed that OpenAI signed a contract with Oracle to purchase $300 billion in computing power over the next five years. In September 2025, OpenAI and NVIDIA announced a memorandum of understanding that included a potential deployment of at least 10 gigawatts of NVIDIA systems and a $100 billion investment from NVIDIA in OpenAI. OpenAI expected the negotiations to be completed within weeks. As of January 2026, this has not been realized, and the two sides are rethinking the future of their partnership. In October 2025, OpenAI announced a multi-billion dollar deal with AMD. OpenAI committed to purchasing six gigawatts worth of AMD chips, starting with the MI450. OpenAI will have the option to buy up to 160 million shares of AMD, about 10% of the company, depending on development, performance and share price targets. In December 2025, Disney said it would make a $1 billion investment in OpenAI, and signed a three-year licensing deal that will let users generate videos using Sora—OpenAI's short-form AI video platform. More than 200 Disney, Marvel, Star Wars and Pixar characters will be available to OpenAI users. In early 2026, Amazon entered advanced discussions to invest up to $50 billion in OpenAI as part of a potential artificial intelligence partnership. Under the proposed agreement, OpenAI’s models could be integrated into Amazon’s digital assistant Alexa and other internal projects. OpenAI provides LLMs to the Artificial Intelligence Cyber Challenge and to the Advanced Research Projects Agency for Health. In October 2024, The Intercept revealed that OpenAI's tools are considered "essential" for AFRICOM's mission and included in an "Exception to Fair Opportunity" contractual agreement between the United States Department of Defense and Microsoft. In December 2024, OpenAI said it would partner with defense-tech company Anduril to build drone defense technologies for the United States and its allies. In 2025, OpenAI's Chief Product Officer, Kevin Weil, was commissioned lieutenant colonel in the U.S. Army to join Detachment 201 as senior advisor. In June 2025, the U.S. Department of Defense awarded OpenAI a $200 million one-year contract to develop AI tools for military and national security applications. OpenAI announced a new program, OpenAI for Government, to give federal, state, and local governments access to its models, including ChatGPT. Services In February 2019, GPT-2 was announced, which gained attention for its ability to generate human-like text. In 2020, OpenAI announced GPT-3, a language model trained on large internet datasets. GPT-3 is aimed at natural language answering questions, but it can also translate between languages and coherently generate improvised text. It also announced that an associated API, named the API, would form the heart of its first commercial product. Eleven employees left OpenAI, mostly between December 2020 and January 2021, in order to establish Anthropic. In 2021, OpenAI introduced DALL-E, a specialized deep learning model adept at generating complex digital images from textual descriptions, utilizing a variant of the GPT-3 architecture. In December 2022, OpenAI received widespread media coverage after launching a free preview of ChatGPT, its new AI chatbot based on GPT-3.5. According to OpenAI, the preview received over a million signups within the first five days. According to anonymous sources cited by Reuters in December 2022, OpenAI Global, LLC was projecting $200 million of revenue in 2023 and $1 billion in revenue in 2024. After ChatGPT was launched, Google announced a similar chatbot, Bard, amid internal concerns that ChatGPT could threaten Google’s position as a primary source of online information. On February 7, 2023, Microsoft announced that it was building AI technology based on the same foundation as ChatGPT into Microsoft Bing, Edge, Microsoft 365 and other products. On March 14, 2023, OpenAI released GPT-4, both as an API (with a waitlist) and as a feature of ChatGPT Plus. On November 6, 2023, OpenAI launched GPTs, allowing individuals to create customized versions of ChatGPT for specific purposes, further expanding the possibilities of AI applications across various industries. On November 14, 2023, OpenAI announced they temporarily suspended new sign-ups for ChatGPT Plus due to high demand. Access for newer subscribers re-opened a month later on December 13. In December 2024, the company launched the Sora model. It also launched OpenAI o1, an early reasoning model that was internally codenamed strawberry. Additionally, ChatGPT Pro—a $200/month subscription service offering unlimited o1 access and enhanced voice features—was introduced, and preliminary benchmark results for the upcoming OpenAI o3 models were shared. On January 23, 2025, OpenAI released Operator, an AI agent and web automation tool for accessing websites to execute goals defined by users. The feature was only available to Pro users in the United States. OpenAI released deep research agent, nine days later. It scored a 27% accuracy on the benchmark Humanity's Last Exam (HLE). Altman later stated GPT-4.5 would be the last model without full chain-of-thought reasoning. In July 2025, reports indicated that AI models by both OpenAI and Google DeepMind solved mathematics problems at the level of top-performing students in the International Mathematical Olympiad. OpenAI's large language model was able to achieve gold medal-level performance, reflecting significant progress in AI's reasoning abilities. On October 6, 2025, OpenAI unveiled its Agent Builder platform during the company's DevDay event. The platform includes a visual drag-and-drop interface that lets developers and businesses design, test, and deploy agentic workflows with limited coding. On October 21, 2025, OpenAI introduced ChatGPT Atlas, a browser integrating the ChatGPT assistant directly into web navigation, to compete with existing browsers such as Google Chrome and Apple Safari. On December 11, 2025, OpenAI announced GPT-5.2. This model will be better at creating spreadsheets, building presentations, perceiving images, writing code and understanding long context. On January 27, 2026, OpenAI introduced Prism, a LaTeX-native workspace meant to assist scientists to help with research and writing. The platform utilizes GPT-5.2 as a backend to automate the process of drafting for scientific papers, including features for managing citations, complex equation formatting, and real-time collaborative editing. In March 2023, the company was criticized for disclosing particularly few technical details about products like GPT-4, contradicting its initial commitment to openness and making it harder for independent researchers to replicate its work and develop safeguards. OpenAI cited competitiveness and safety concerns to justify this repudiation. OpenAI's former chief scientist Ilya Sutskever argued in 2023 that open-sourcing increasingly capable models was increasingly risky, and that the safety reasons for not open-sourcing the most potent AI models would become "obvious" in a few years. In September 2025, OpenAI published a study on how people use ChatGPT for everyday tasks. The study found that "non-work tasks" (according to an LLM-based classifier) account for more than 72 percent of all ChatGPT usage, with a minority of overall usage related to business productivity. In July 2023, OpenAI launched the superalignment project, aiming within four years to determine how to align future superintelligent systems. OpenAI promised to dedicate 20% of its computing resources to the project, although the team denied receiving anything close to 20%. OpenAI ended the project in May 2024 after its co-leaders Ilya Sutskever and Jan Leike left the company. In August 2025, OpenAI was criticized after thousands of private ChatGPT conversations were inadvertently exposed to public search engines like Google due to an experimental "share with search engines" feature. The opt-in toggle, intended to allow users to make specific chats discoverable, resulted in some discussions including personal details such as names, locations, and intimate topics appearing in search results when users accidentally enabled it while sharing links. OpenAI announced the feature's permanent removal on August 1, 2025, and the company began coordinating with search providers to remove the exposed content, emphasizing that it was not a security breach but a design flaw that heightened privacy risks. CEO Sam Altman acknowledged the issue in a podcast, noting users often treat ChatGPT as a confidant for deeply personal matters, which amplified concerns about AI handling sensitive data. Management In 2018, Musk resigned from his Board of Directors seat, citing "a potential future conflict [of interest]" with his role as CEO of Tesla due to Tesla's AI development for self-driving cars. OpenAI stated that Musk's financial contributions were below $45 million. On March 3, 2023, Reid Hoffman resigned from his board seat, citing a desire to avoid conflicts of interest with his investments in AI companies via Greylock Partners, and his co-founding of the AI startup Inflection AI. Hoffman remained on the board of Microsoft, a major investor in OpenAI. In May 2024, Chief Scientist Ilya Sutskever resigned and was succeeded by Jakub Pachocki. Co-leader Jan Leike also departed amid concerns over safety and trust. OpenAI then signed deals with Reddit, News Corp, Axios, and Vox Media. Paul Nakasone then joined the board of OpenAI. In August 2024, cofounder John Schulman left OpenAI to join Anthropic, and OpenAI's president Greg Brockman took extended leave until November. In September 2024, CTO Mira Murati left the company. In November 2025, Lawrence Summers resigned from the board of directors. Governance and legal issues In May 2023, Sam Altman, Greg Brockman and Ilya Sutskever posted recommendations for the governance of superintelligence. They stated that superintelligence could happen within the next 10 years, allowing a "dramatically more prosperous future" and that "given the possibility of existential risk, we can't just be reactive". They proposed creating an international watchdog organization similar to IAEA to oversee AI systems above a certain capability threshold, suggesting that relatively weak AI systems on the other side should not be overly regulated. They also called for more technical safety research for superintelligences, and asked for more coordination, for example through governments launching a joint project which "many current efforts become part of". In July 2023, the FTC issued a civil investigative demand to OpenAI to investigate whether the company's data security and privacy practices to develop ChatGPT were unfair or harmed consumers (including by reputational harm) in violation of Section 5 of the Federal Trade Commission Act of 1914. These are typically preliminary investigative matters and are nonpublic, but the FTC's document was leaked. In July 2023, the FTC launched an investigation into OpenAI over allegations that the company scraped public data and published false and defamatory information. They asked OpenAI for comprehensive information about its technology and privacy safeguards, as well as any steps taken to prevent the recurrence of situations in which its chatbot generated false and derogatory content about people. The agency also raised concerns about ‘circular’ spending arrangements—for example, Microsoft extending Azure credits to OpenAI while both companies shared engineering talent—and warned that such structures could negatively affect the public. In September 2024, OpenAI's global affairs chief endorsed the UK's "smart" AI regulation during testimony to a House of Lords committee. In February 2025, OpenAI CEO Sam Altman stated that the company is interested in collaborating with the People's Republic of China, despite regulatory restrictions imposed by the U.S. government. This shift comes in response to the growing influence of the Chinese artificial intelligence company DeepSeek, which has disrupted the AI market with open models, including DeepSeek V3 and DeepSeek R1. Following DeepSeek's market emergence, OpenAI enhanced security protocols to protect proprietary development techniques from industrial espionage. Some industry observers noted similarities between DeepSeek's model distillation approach and OpenAI's methodology, though no formal intellectual property claim was filed. According to Oliver Roberts, in March 2025, the United States had 781 state AI bills or laws. OpenAI advocated for preempting state AI laws with federal laws. According to Scott Kohler, OpenAI has opposed California's AI legislation and suggested that the state bill encroaches on a more competent federal government. Public Citizen opposed a federal preemption on AI and pointed to OpenAI's growth and valuation as evidence that existing state laws have not hampered innovation. Before May 2024, OpenAI required departing employees to sign a lifelong non-disparagement agreement forbidding them from criticizing OpenAI and acknowledging the existence of the agreement. Daniel Kokotajlo, a former employee, publicly stated that he forfeited his vested equity in OpenAI in order to leave without signing the agreement. Sam Altman stated that he was unaware of the equity cancellation provision, and that OpenAI never enforced it to cancel any employee's vested equity. However, leaked documents and emails refute this claim. On May 23, 2024, OpenAI sent a memo releasing former employees from the agreement. OpenAI was sued for copyright infringement by authors Sarah Silverman, Matthew Butterick, Paul Tremblay and Mona Awad in July 2023. In September 2023, 17 authors, including George R. R. Martin, John Grisham, Jodi Picoult and Jonathan Franzen, joined the Authors Guild in filing a class action lawsuit against OpenAI, alleging that the company's technology was illegally using their copyrighted work. The New York Times also sued the company in late December 2023. In May 2024 it was revealed that OpenAI had destroyed its Books1 and Books2 training datasets, which were used in the training of GPT-3, and which the Authors Guild believed to have contained over 100,000 copyrighted books. In 2021, OpenAI developed a speech recognition tool called Whisper. OpenAI used it to transcribe more than one million hours of YouTube videos into text for training GPT-4. The automated transcription of YouTube videos raised concerns within OpenAI employees regarding potential violations of YouTube's terms of service, which prohibit the use of videos for applications independent of the platform, as well as any type of automated access to its videos. Despite these concerns, the project proceeded with notable involvement from OpenAI's president, Greg Brockman. The resulting dataset proved instrumental in training GPT-4. In February 2024, The Intercept as well as Raw Story and Alternate Media Inc. filed lawsuit against OpenAI on copyright litigation ground. The lawsuit is said to have charted a new legal strategy for digital-only publishers to sue OpenAI. On April 30, 2024, eight newspapers filed a lawsuit in the Southern District of New York against OpenAI and Microsoft, claiming illegal harvesting of their copyrighted articles. The suing publications included The Mercury News, The Denver Post, The Orange County Register, St. Paul Pioneer Press, Chicago Tribune, Orlando Sentinel, Sun Sentinel, and New York Daily News. In June 2023, a lawsuit claimed that OpenAI scraped 300 billion words online without consent and without registering as a data broker. It was filed in San Francisco, California, by sixteen anonymous plaintiffs. They also claimed that OpenAI and its partner as well as customer Microsoft continued to unlawfully collect and use personal data from millions of consumers worldwide to train artificial intelligence models. On May 22, 2024, OpenAI entered into an agreement with News Corp to integrate news content from The Wall Street Journal, the New York Post, The Times, and The Sunday Times into its AI platform. Meanwhile, other publications like The New York Times chose to sue OpenAI and Microsoft for copyright infringement over the use of their content to train AI models. In November 2024, a coalition of Canadian news outlets, including the Toronto Star, Metroland Media, Postmedia, The Globe and Mail, The Canadian Press and CBC, sued OpenAI for using their news articles to train its software without permission. In October 2024 during a New York Times interview, Suchir Balaji accused OpenAI of violating copyright law in developing its commercial LLMs which he had helped engineer. He was a likely witness in a major copyright trial against the AI company, and was one of several of its current or former employees named in court filings as potentially having documents relevant to the case. On November 26, 2024, Balaji died by suicide. His death prompted the circulation of conspiracy theories alleging that he had been deliberately silenced. California Congressman Ro Khanna endorsed calls for an investigation. On April 24, 2025, Ziff Davis sued OpenAI in Delaware federal court for copyright infringement. Ziff Davis is known for publications such as ZDNet, PCMag, CNET, IGN and Lifehacker. In April 2023, the EU's European Data Protection Board (EDPB) formed a dedicated task force on ChatGPT "to foster cooperation and to exchange information on possible enforcement actions conducted by data protection authorities" based on the "enforcement action undertaken by the Italian data protection authority against OpenAI about the ChatGPT service". In late April 2024 NOYB filed a complaint with the Austrian Datenschutzbehörde against OpenAI for violating the European General Data Protection Regulation. A text created with ChatGPT gave a false date of birth for a living person without giving the individual the option to see the personal data used in the process. A request to correct the mistake was denied. Additionally, neither the recipients of ChatGPT's work nor the sources used, could be made available, OpenAI claimed. OpenAI was criticized for lifting its ban on using ChatGPT for "military and warfare". Up until January 10, 2024, its "usage policies" included a ban on "activity that has high risk of physical harm, including", specifically, "weapons development" and "military and warfare". Its new policies prohibit "[using] our service to harm yourself or others" and to "develop or use weapons". In August 2025, the parents of a 16-year-old boy who died by suicide filed a wrongful death lawsuit against OpenAI (and CEO Sam Altman), alleging that months of conversations with ChatGPT about mental health and methods of self-harm contributed to their son's death and that safeguards were inadequate for minors. OpenAI expressed condolences and said it was strengthening protections (including updated crisis response behavior and parental controls). Coverage described it as a first-of-its-kind wrongful death case targeting the company's chatbot. The complaint was filed in California state court in San Francisco. In November 2025, the Social Media Victims Law Center and Tech Justice Law Project filed seven lawsuits against OpenAI, of which four lawsuits alleged wrongful death. The suits were filed on behalf of Zane Shamblin, 23, of Texas; Amaurie Lacey, 17, of Georgia; Joshua Enneking, 26, of Florida; and Joe Ceccanti, 48, of Oregon, who each committed suicide after prolonged ChatGPT usage. In December 2025, Stein-Erik Soelberg, who was 56 years old at the time, allegedly murdered his mother Suzanne Adams. In the months prior the paranoid, delusional man often discussed his ideas with ChatGPT. Adam's estate then sued OpenAI claiming that the company shared responsibility due to the risk of chatbot psychosis despite the fact that chatbot psychosis is not a real medical diagnosis. OpenAI responded saying they will make ChatGPT safer for users disconnected from reality. See also References Further reading External links |
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Contents Morgan le Fay Morgan le Fay (/ˈmɔːrɡən lə ˈfeɪ/; Welsh and Cornish: Morgen; Modern French: Fée Morgane), alternatively known as Morgan[n]a, Morgain[a/e], Morgant[e], Morg[a]ne, Morgayn[e], Morgein[e], and Morgue[in] among other names and spellings, is a powerful and ambiguous enchantress from the legend of King Arthur, in which most often she and he are siblings. According to the different authors, she is a fairy or a human; beneficial or harmful; either a sister, half-sister, or unrelated to Arthur. A significant aspect in many of Morgan's medieval and later iterations is the unpredictable duality of her nature, with potential for both good and evil. Her character may have originated from Welsh mythology as well as from other ancient and medieval myths and historical figures. Early appearances of Morgan in Arthurian literature do not elaborate her character beyond her role as a goddess, a fay, a witch, or a sorceress, generally benevolent and connected to Arthur as his magical saviour and protector. The earliest documented account, by Geoffrey of Monmouth in Vita Merlini (written c. 1150) refers to Morgan in association with the Isle of Apples (Avalon), to which Arthur was carried after having been fatally wounded at the Battle of Camlann, as the leader of the nine magical sisters unrelated to Arthur. Therein, and in the early chivalric romances by Chrétien de Troyes and others, Morgan's chief role is that of a great healer. Romance authors of the late 12th century established Morgan as Arthur's supernatural elder sister. Her prominence increased as the legend of Arthur developed over time, as did her moral ambivalence, eventually resulting in a mostly villainous portrayal in the cyclical prose such as the Lancelot-Grail and the Post-Vulgate Cycle. In the 13th-century prose cycles – and the later works based on them, including the influential Le Morte d'Arthur – she is usually described as the youngest daughter of Arthur's mother Igraine and her first husband. Arthur, son of Igraine and Uther Pendragon, is thus Morgan's half-brother, and her full sisters include Mordred's mother, the Queen of Orkney. The young Morgan unhappily marries Urien, with whom she has a son, Yvain. She becomes an apprentice of Merlin, and a capricious and vindictive adversary of some knights of the Round Table, all the while harbouring a special hatred for Arthur's wife Guinevere. In this tradition, she is also sexually active and even predatory, taking numerous lovers that may include Merlin and Accolon, with an unrequited love for Lancelot. In some variants, including in the popular retelling by Malory, Morgan is the greatest enemy of Arthur, scheming to usurp his throne and indirectly becoming an instrument of his death. However, she eventually reconciles with Arthur, retaining her original role of taking him on his final journey to Avalon. Several of numerous and often unnamed fairy-mistress and maiden-temptress type characters found through the Arthurian romance genre may also be considered as appearances of Morgan in her different aspects. Medieval and Renaissance tales feature continuations from the aftermath of Camlann where Morgan appears as the immortal queen of Avalon in both Arthurian and non-Arthurian stories, sometimes alongside Arthur. After a period of being largely absent from contemporary culture, Morgan's character again rose to prominence in the 20th and 21st centuries, appearing in a wide variety of roles and portrayals. Notably, her modern character is frequently being conflated with that of her sister, the Queen of Orkney, thus making Morgan the mother of Arthur's son and nemesis Mordred. Etymology and origins The earliest spelling of the name (found in Geoffrey of Monmouth's Vita Merlini, written c. 1150) is Morgen, which is likely derived from Old Welsh or Old Breton Morgen, meaning 'sea-born' (from Common Brittonic *Mori-genā, the masculine form of which, *Mori-genos, survived in Middle Welsh as Moryen or Morien; a cognate form in Old Irish is Muirgen, the name of a Celtic Christian shapeshifting female saint who was associated with the sea). The name is not to be confused with the unrelated Modern Welsh masculine name Morgan (spelled Morcant in the Old Welsh period). As her epithet "le Fay" (a pseudo-French phrase coined up in the 15th century by Thomas Malory, who derived it from the original French descriptive form la fée 'the fairy'; Malory would also use the form "le Fey" alternatively with "le Fay") and some traits indicate, the figure of Morgan appears to have been a remnant of supernatural females from Celtic mythology, and her main name could be connected to the myths of Morgens (also known as Mari-Morgans or just Morgans), the Welsh and Breton fairy water spirits related to the legend of Princess Dahut (Ahes). Speculatively, beginning with Lucy Allen Paton in 1904, Morgan has been connected with the shapeshifting and multifaced Irish goddess of strife known as the Morrígan ('Great Queen'). Proponents of this theory have included Roger Sherman Loomis, who doubted the Muirgen connection. Further early inspiration for her figure likely came from other Welsh folklore, as well as possibly other works of medieval Irish literature and hagiography, and perhaps historical figures such as Empress Matilda. One of the proposed candidates for the historical Arthur, Artuir mac Áedán, was recorded as having a sister named Maithgen (daughter of king Áedán mac Gabráin, a 6th-century king of Dál Riata), whose name also appears as that of a prophetic druid in the Irish legend of Saint Brigid of Kildare. Geoffrey's description of Morgen and her sisters in the Vita Merlini closely resembles the story of the nine Gaulish priestesses of the isle of Sena (now Île de Sein) called Gallisenae (or Gallizenae), as described by the 1st-century Roman geographer Pomponius Mela, strongly suggesting that Pomponius' Description of the World (De situ orbis) was one of Geoffrey's prime sources for at least his own, unique version. Also suggested have been possible influence by other magical women from the Irish mythology such as the mother of hero Fráech, and elements of the classical Greek mythology sorceresses or goddesses such as Circe and especially Medea — who, similar to Morgan, are often alternately benevolent and malicious.[a] Other possibly related Greco-Roman goddesses include the water deities Sequana, Sirona, and Sulis, the last one in particular having been worshipped as healer but also negatively associated with poisonings in a Morgan-like dual nature. Morgan has also been often linked with the supernatural mother Modron, derived from the continental mother goddess figure of Dea Matrona and featured in medieval Welsh literature. Modron appears in Welsh Triad 70 ("Three Blessed Womb-Burdens of the Island of Britain") – in which her children by Urien are named Owain mab Urien (son) and Morfydd (daughter) – and a later folktale have recorded more fully in the manuscript Peniarth 147. A fictionalised version of the historical king Urien is usually Morgan le Fay's husband in the variations of Arthurian legend informed by continental romances, wherein their son is named Yvain. Furthermore, the historical Urien had a treacherous ally named Morcant Bulc who plotted to assassinate him, much as Morgan attempts to kill Urien. Additionally, Modron is called "daughter of Afallach", a Welsh ancestor figure also known as Avallach or Avalloc, whose name can also be interpreted as a noun meaning 'a place of apples'; in the tale of Owain and Morfydd's conception in Peniarth 147, Modron is called the "daughter of the King of Annwn", a Celtic Otherworld. This evokes Avalon, the marvelous "Isle of Apples" with which Morgan has been associated since her earliest appearances, and the Irish legend of the otherworldly woman Niamh including the motif of apple in connection to Avalon-like Otherworld isle of Tír na nÓg ("Land of Youth"). As summarised by Will Hasty, "while this is difficult to establish with certainty the relationship between female figures such as these in the Arthurian tradition and the otherworldly goddesses, sprites, and nymphs of Irish and Welsh myths (a relationship is assumed especially in the case of Morgan le Fay), both groups demonstrate similar ambivalent characteristics: they are by turns dangerous and desirable, implicated alternately in fighting, death, sexuality, and fertility." While many works make Morgan specifically human, she almost always keeps her magical powers and often also her otherworldly if not divine attributes and qualities. Some medieval authors refer to her as a fairy queen or even outright a goddess (dea, déesse, gotinne). According to Gerald of Wales in his 12th-century De instructione principis, a noblewoman and close relative of King Arthur named Morganis carried the dead Arthur to her island of Avalon (identified by him as Glastonbury), where he was buried. Writing in the early 13th century in Speculum ecclesiae, Gerald also wrote that "as a result, the fanciful Britons and their bards invented the legend that some kind of a fantastic goddess (dea quaedam phantastica) had removed Arthur's body to the Isle of Avalon, so that she might cure his wounds there," for the purpose of enabling the possibility of King Arthur's messianic return. In his encyclopaedic work, Otia Imperialia, written around the same time and with similar derision for this belief, Gervase of Tilbury calls her Morganda Fatata (Morganda the Fairy). Morgan retains her early role as Arthur's legendary healer throughout later Arthurian tradition. Medieval and Renaissance literature Morgan first appears by name in Vita Merlini, written by Norman-Welsh cleric Geoffrey of Monmouth. Purportedly an account of the life of Merlin, it elaborates some episodes from Geoffrey's more famous earlier work, Historia Regum Britanniae (1136). In Historia, Geoffrey relates how King Arthur, gravely wounded by Mordred at the Battle of Camlann, is taken off to the blessed Isle of Apple Trees (Latin Insula Pomorum), Avalon, to be healed; Avalon (Ynys Afallach in the Welsh versions of Historia) is also mentioned as the place where Arthur's sword Excalibur was forged. (Geoffrey's Arthur does have a sister, whose name is Anna, but the possibility of her being a predecessor to Morgan is unknown.) In Vita Merlini, Geoffrey describes this island in more detail and names Morgen as the chief of the nine magical queen sisters who dwell there, ruling in their own right. Morgen agrees to take Arthur, delivered to her by Taliesin to have him revived. She and her sisters are capable of shapeshifting and flying, and (at least seemingly) use their powers only for good. Morgen is also said to be a learned mathematician and to have taught it and astronomy to her fellow nymph (nymphae) sisters, whose names are listed as Moronoe, Mazoe, Gliten, Glitonea, Gliton, Tyronoe, Thiten (Thitis), and Thiton (Thetis). She who is first among them is more skilled in the healing art, and also surpasses her sisters in beauty. Morgen is her name, and she has learned what useful properties all the herbs contain, so that she can cure the body ills. She knows, too, the art by which to change her shape, and to fly through the air, like Daedalus, on strange wings. When she wishes, she is now at Brest (Brisiti), now at Chartres (Carnoti), now at Pavia (Papie); and at will she glides down from the sky onto your shores. (...) Morgen received us with due honor. She put the king in her chamber on a golden bed, uncovered his wound with her noble hand and looked long at it. At length she said he could be cured if only he stayed with her a long while and accepted her treatment. We therefore happily committed the king to her care, and spred our sails to favourable winds on return journey. In the making of this arguably Virgin Mary-type character and her sisters, Geoffrey might have been influenced by the first-century Roman cartographer Pomponius Mela, who has described an oracle at the Île de Sein off the coast of Brittany and its nine virgin priestesses believed by the continental Celtic Gauls to have the power to cure disease and perform various other awesome magic, such as controlling the sea through incantations, foretelling the future, and changing themselves into any animal. In addition, according to a theory postulated by R. S. Loomis, it is possible that Geoffrey has not been the original inventor of Morgan, as the character may have had already existed in Breton folklore in the hypothetical unrecorded oral stories that featured her as Arthur's fairy saviour, or even also his fairy godmother (her earliest shared supernatural ability being able to traverse on or under water). Such stories being told by wandering storytellers (as credited by Gerald of Wales) would then influence multiple authors writing independently from each other, especially since Vita Merlini was a relatively little-known text. Geoffrey's description of Morgan is notably very similar to that in Benoît de Sainte-Maure's epic poem Roman de Troie (c. 1155–1160), a story of the ancient Trojan War in which Morgan herself makes an unexplained appearance in this second known text featuring her. As Orvan the Fairy (Orva la fée, likely a corruption of a spelling such as *Morgua[b] in the original-text), there she first lustfully loves the Trojan hero Hector and gifts him a wonderful horse, but then pursues him with hate after he rejects her. The abrupt way in which she is used suggests Benoît did expect his aristocratic audience to have been already familiar with her character. Another such ancient-times appearance of a Morgan character can be found in the much later Perceforest (1330s), within the fourth book which is set in Britain during Julius Caesar's invasions, where the fairy Morgane lives in the isle of Zeeland and has learned her magic from Zephir. Here, she has a daughter named Morganette and an adoptive son named Passelion, who in turn have a son named Morgan, described as an ancestor of the Lady of the Lake. In Jaufre, an early Occitan language Arthurian romance dated c. 1180, Morgan seems to appear, without being named other than introducing herself as the "Fairy of Gibel" (fada de Gibel; Gibel was the Arabic name of Sicily's Mount Etna that is also occurring in an Italian version of the Avalon motif in some later works). Here, she is the ruler of an underground kingdom who takes the protagonist knight Jaufre (Griflet) through a fountain to gift him her magic ring of protection. In the romance poem Lanzelet, translated by the end of the 12th century by Ulrich von Zatzikhoven from a now-lost French text, the infant Lancelot is spirited away by a water fairy (merfeine in Old High German) and raised in her paradise island country of Meidelant ('Land of Maidens'). Ulrich's unnamed fairy queen character might be also related to Geoffrey's Morgen, as well as to the early Breton oral tradition of Morgan's figure, especially as her son there is named Mabuz, similar to the name of Modron's son Mabon ap Modron. In Layamon's Middle English poem The Chronicle of Britain (c. 1215), Arthur was taken to Avalon by two women to be healed there by its most beautiful elfen (aluen) queen named Argante or Argane; it is possible her name had been originally Margan(te) before it was changed in manuscript transmission. The 12th-century French poet Chrétien de Troyes already mentions her in his first romance, Erec and Enide, completed around 1170. In it, a love of Morgan (Morgue) is Guigomar (Guingomar, Guinguemar), the Lord of the Isle of Avalon and a nephew of King Arthur, a character derivative of Guigemar from the Breton lai Guigemar by Marie de France. Guingamor's own lai links him to the beautiful magical entity known only as the "fairy mistress", who was later identified by Thomas Chestre's Sir Launfal as Dame Tryamour, the daughter of the King of the Celtic Otherworld who shares many characteristics with Chrétien's Morgan. It was noted that even Chrétien' earliest mention of Morgan already shows an enmity between her and Queen Guinevere, and although Morgan is represented only in a benign role by Chrétien, she resides in a mysterious place known as the Vale Perilous (which some later authors would say she has created as a place of punishment for unfaithful knights). She is later mentioned in the same poem when Arthur provides the wounded hero Erec with a healing balm made by his sister Morgan. This episode affirms her early role as a healer, in addition to being one of the first instances of Morgan presented as Arthur's sister. Healing remains Morgan's chief ability, but Chrétien also hints at her potential to harm. Chrétien again refers to Morgan as a great healer in his later romance Yvain, the Knight of the Lion, in an episode in which the Lady of Norison restores the maddened hero Yvain to his senses with a magical potion provided by Morgan the Wise (Morgue la sage). Morgan the Wise is female in Chrétien's original, as well as in the Norse version Ivens saga, but male in the English Ywain and Gawain. While the fairy Modron is mother of Owain mab Urien in the Welsh myth, and Morgan would be assigned this role in the later literature, this first continental association between Yvain (the romances' version of Owain) and Morgan does not imply they are son and mother. The earliest mention of Morgan as Yvain's mother is found in Tyolet, an early 13th-century Breton lai. The Middle Welsh Arthurian tale Geraint son of Erbin, either based on Chrétien's Erec and Enide or derived from a common source, mentions King Arthur's chief physician named Morgan Tud. It is believed that this character, though considered a male in Gereint, may be derived from Morgan le Fay, though this has been a matter of debate among Arthurian scholars since the 19th century (the epithet Tud may be a Welsh or Breton cognate or borrowing of Old Irish tuath, 'north, left', 'sinister, wicked', also 'fairy (fay), elf'). There, Morgan is called to treat Edern ap Nudd, Knight of the Sparrowhawk, following the latter's defeat at the hands of his adversary Geraint, and is later called on by Arthur to treat Geraint himself. In the German version of Erec, the 12th-century knight and poet Hartmann von Aue has Erec healed by Guinevere with a special plaster that was given to Arthur by the king's sister, the goddess (gotinne) Feimurgân (Fâmurgân, Fairy Murgan): When she began to demonstrate her magic powers, she had very soon circumnavigated the world and come back again. (...) Both in the air and on the earth she could hover at her ease, on the waves and beneath them. She was totally indifferent as to whether she lived in the fire or, just as much at her ease, in the dew. (...) And when it took her fancy she could change a man into a bird or an animal. (...) Mighty was she in magic and her life was greatly in defiance of God, for at her command were the birds in the wild, in the woods and fields, and what seems to me greatest, those evil spirits, that are called devils – they were all at her command. She was well capable of marvels for dragons had to bring from the air support in her affairs, as well as the fish in the sea. Moreover, she had kin deep in Hell: the Devil was her companion. He sent her aid, even from the fire, as much as she wanted. And whatever she would have from this earth, she took, without peril, in ample measure, all for herself. The earth bore no root, the power of which was not as familiar to her as the back of my hand is to me. (...) This earth never acquired a better mistress of magic arts than Feimurgân. In writing that, Hartmann might have not been influenced by Chrétien, but rather by an earlier oral tradition from the stories of Breton bards. Hartmann also separated Arthur's sister (that is Feimurgân) from the fairy mistress of the lord of Avalon (Chrétien's Guigomar), who in his version is named Marguel. In the anonymous First Continuation of Chrétien's Perceval, the Story of the Grail, the fairy lover of its variant of Guigomar (here as Guingamuer) is named Brangepart, and the two have a son Brangemuer who became the king of an otherworldly isle "where no mortal lived". In the 13th-century romance Parzival, another German knight-poet Wolfram von Eschenbach inverted Hartmann's Fâmurgân's name to create that of Arthur's fairy ancestor named Terdelaschoye de Feimurgân, the wife of Mazadân, where the part "Terdelaschoye" comes from Terre de la Joie, or Land of Joy; the text also mentions the mountain of Fâmorgân. Jean Markale further identified a Morganian figure in Wolfram's ambiguous character of Cundrie the Sorceress (later better known as Kundry) through her plot function as mistress of illusions in an enchanted fairy garden. Speculatively, Loomis and John Matthews further identified other perceived avatars of Morgan as the "Besieged Lady" archetype in various early works associated with the Castle of Maidens motif, often appearing as (usually unnamed) wife of King Lot and mother of Gawain. These characters include the Queen of Meidenlant in Diu Crône, the lady of Castellum Puellarum in De Ortu Waluuanii, and the nameless heroine of the Breton lai Doon, among others, including some in later works (such as with Lady Lufamore of Maydenlande in Sir Perceval of Galles). Loomis also linked her to the eponymous seductress evil queen from The Queen of Scotland, a 19th-century ballad "containing Arthurian material dating back to the year 1200." A recently discovered moralistic manuscript written in Anglo-Norman French is the only known instance of medieval Arthurian literature presented as being composed by Morgan herself. This late 12th-century text is purportedly addressed to her court official and tells of the story of a knight called Piers the Fierce; it is likely that the author's motive was to draw a satirical moral from the downfall of the English knight Piers Gaveston, 1st Earl of Cornwall. Morgayne is titled in it as "empress of the wilderness, queen of the damsels, lady of the isles, and governor of the waves of the great sea." Morgan (Morganis) is also mentioned in the Draco Normannicus, a 12th-century (c. 1167–1169) Latin chronicle by Étienne de Rouen, which contains a fictitious letter addressed by King Arthur to Henry II of England, written for political propaganda purpose of having 'Arthur' criticise King Henry for invading the Duchy of Brittany. Notably, it is one of the first known texts that made her a sister to Arthur, as she is in the works of Chrétien and many others after him. As described by Étienne, Arthur, gravely wounded, sought the help of his sister, who held the holy Isle of Avalon. Morgan, the everlasting nymph (Morganis nympha perennis), received her brother here, cured him, nourished him, revived him, and made him immortal. He was presented the Antipodes as his kingdom. The faerie folk being unarmed, the great war leader comes to their aid: he fears no battle. Morgan's role was greatly expanded by the unknown authors of the early-13th-century Old French prose romances of the Vulgate Cycle, also known as the Lancelot-Grail cycle, and its subsequent rewrite, the Prose Tristan-influenced Post-Vulgate Cycle. (Both of these cycles are believed to be at least influenced by the Cistercian religious order,[c] although some of these attitudes may be arguably shared with the pre-Christian source material.[d]) Integrating her figure fully into the Arthurian world, they also portray Morgan's ways and deeds as being much more sinister and aggressive than they are in Geoffrey or Chrétien, showing her undergoing a series of transformations in the process of becoming a much more chaotic and unpredictable character. Beginning as an erratic ally of Arthur and a notorious temptress opposed to his wife and some of his knights (especially Lancelot, doubling as her unrequited love interest) in the original stories of the Vulgate Cycle, Morgan's figure eventually often turns into an ambitious and depraved nemesis of King Arthur himself in the Post-Vulgate stories. A common image of Morgan becomes a malicious, jealous and cruel sorceress, the source of many intrigues at the royal court of Arthur and elsewhere. In some of the later works, she is also subversively working to take over Arthur's throne through her mostly harmful magic and scheming, including manipulating men. Most of the time, Morgan's magic arts correspond with these of Merlin's and the Lady of the Lake's, featuring shapeshifting, illusion, and sleeping spells.[e] Some scholars even see the figure of the Lady (or Ladies) of the Lake as Morgan's split-off literary double serving as a "benevolent anti-Morgan", especially in the Post-Vulgate tradition: a largely (but not entirely) opposite character created using Morgan's copied traits. Although Morgan is usually depicted in medieval romances as beautiful and seductive, the medieval archetype of the loathly lady is used frequently, as Morgan can be in a contradictory fashion described as both beautiful and ugly even within the same narration. This version of Morgan (usually named Morgane, Morgain or Morgue) first appears in the few surviving verses of the Old French poem Merlin, which later served as the original source for the Vulgate Cycle and consequently also the Post-Vulgate Cycle. It was written c. 1200 by the French knight-poet Robert de Boron, who described her as an illegitimate daughter of Lady Igraine with an initially unnamed Duke of Tintagel, after whose death she is adopted by King Neutres of Garlot. Merlin is the first known work linking Morgan to Igraine and mentioning her learning sorcery after having been sent away for an education. The reader is informed that Morgan was given her moniker 'la fée' ("the fairy") due to her great knowledge. A 14th-century massive prequel to the Arthurian legend, Perceforest, also implies that Arthur's sister was later named after its fée character Morgane from several centuries earlier. In the Huth-Merlin version of Merlin, Morgain and Morgue la fee are introduced as two different half-sisters of Arthur who then become merged into one character later in the text. In a popular tradition, Morgan is the youngest of the daughters of Igraine and her husband, a Duke of Cornwall (or Tintagel) who today is best known as Gorlois. Her father dies in battle with the army of the British high king Uther Pendragon in a war over his wife (Morgan's mother) at the same moment as when Arthur is conceived by Uther, who infiltrates Tintagel Castle with the half-demon Merlin's magic aid. In the poem's prose version and its continuations, she has at least two elder sisters. Various manuscripts list up to five sisters or half-sisters of Arthur, sometimes from different fathers, and some do not mention Morgan being a bastard (step)child. In the best-known version, her sisters are Elaine (Blasine) and the Queen of Orkney sometimes known as Morgause, the latter of whom is the mother of Arthur's knights Gawain, Agravain, Gaheris and Gareth by King Lot, and the traitor Mordred by Arthur (in some romances the wife of King Lot is called Morcades, a name that R. S. Loomis argued was another name of Morgan). At a young age, Morgan is sent to a convent after Arthur's father Uther marries her mother, who later gives him a son, Arthur (which makes him Morgan's younger half-brother). There, Morgan masters the seven arts and begins her study of magic, going on to specialise in astronomie (astronomy and astrology) and healing; the Prose Merlin describes her as "wonderfully adept" and "working hard all the time." The Vulgate Suite du Merlin narration describes Morgan's unmatched beauty and her various skills and qualities of character: She was comely in body and features, she stood straight and was wonderfully pleasant and a good singer. She was the best worker with her hands that anyone knew about in any land, and she was the cleverest of all. And she had the fairest head of any suited for a woman, and the most beautiful hands, and her skin was softer than millet. But she was the most lustful woman in all Great Britain and the lewdest. And as long as she was in her right mind, she was more courteous than any, but when she was angry with anyone, there was no need in trying to reconcile them. Uther (or Arthur himself in the Post-Vulgate) betroths her to his ally, King Urien of Gorre (Gore), the realm described as an Otherworldly northern British kingdom, possibly the historical Rheged (early versions have alternatively named Morgan's husband as Nentres of Garlot, who later was recast as the husband of her sister Elaine). Now a queen but unhappy with her husband, Morgan serves as a lady-in-waiting for the high queen, Arthur's newly married young wife Guinevere. At first, Morgan and the also young Guinevere are close friends, even wearing shared near-identical rings. However, everything changes when Morgan is caught in an affair with her lover Guiomar (derived from Chrétien's Guigomar) by Guinevere. Usually, Guiomar is depicted as Guinevere's cousin (alternatively, appearing there as Gaimar, he is Guinevere's early lover instead of her relative in the German version Lancelot und Ginevra). The high queen intervenes to break their relationship to prevent the loss of honor (according to some scholarship, possibly also because of Guinevere's perception of Morgan, with her kinship and close relationship with Arthur, as a rival in political power). This incident, introduced in the Prose Merlin and expanded in the Vulgate Lancelot and the Post-Vulgate Suite du Merlin (the Huth Merlin), begins a lifelong feud between Guinevere and Morgan, who leaves the court of Camelot with all her wealth to seek out Merlin and greater powers. The pregnant Morgan later gives birth to Guiomar's son, who is not named in the story but is said to grow up to become a great knight. Morgan then either undertakes or continues her studies of dark magic under Merlin, enamored for her, the details of which vary widely depending on the telling. In the Prose Merlin, for instance, it is Morgan who finds Merlin, whom she "loves passionately". In the Livre d'Artus, where Morgan's first lover is a knight named Bertolais, it is rather Merlin who goes to live with Morgan and her two ladies for a long time following the betrayal of him by Niniane (the Lady of the Lake) with her other lover, just as Morgan wished for him to do. In the Post-Vulgate Suite, Morgan had been tutored by Merlin even before her relationship with Guiomar, and later she returns to learn more. They meet at Lot's funeral, during the time when Morgan is pregnant with Yvain. After Merlin teaches her so much she becomes "the wisest woman in the world", Morgan scorns and drives Merlin away by threatening to torture and kill him if he would not leave her alone, which causes him great sorrow out of his "foolish love" (fol amor) for her. In the Vulgate Lancelot, Morgan learns all her magic only from Merlin (and not in the nunnery). In any case, having finished her studies under Merlin, Morgan begins scheming her vengeance as she tries to undermine virtue and achieve Guinevere's downfall whenever she can. While Morgan's antagonistic actions in the Vulgate Cycle have been motivated by her "great hatred" (grant hayne) toward Guinevere, in the Post-Vulgate Cycle, where Morgan's explicitly evil nature is directly stated and accented, she also works to destroy Arthur's rule and end his life. The most famous and important of these machinations is introduced in the Post-Vulgate Suite, where she arranges for her devoted lover Accolon to obtain the enchanted sword Excalibur as well as its protective scabbard, which has been previously confided to Morgan by Arthur himself as he had trusted her even more than his wife, replacing the real ones with fakes. In a conspiracy with the villainous lord Damas, Morgan plans for Accolon to use Arthur's own magic items against him in single combat, so she and her beloved Accolon would become the rulers. As part of her convoluted plan, both Arthur and Accolon are spirited away from their hunt with Urien by a magical boat of twelve damsels. Confident of her coming victory, Morgan also attempts to murder her sleeping husband Urien with his own sword, but in this act she is stopped by their son Yvain (Uwayne), who pardons her when she protests she has been under the devil's power and promises to abandon her wicked ways. After Arthur nevertheless mortally defeats Accolon in a duel arranged by Morgan, her former mentor Merlin, still having feelings for her, saves her from Arthur's wrath by enabling her to escape. To avenge Accolon's death, which caused her great sorrow, Morgan again steals the scabbard from the sleeping king. Pursued by Arthur for her betrayal, Morgan throws the scabbard into a lake, before temporarily turning herself and her entourage to stone, the sight of which makes Arthur think they have been already punished by God. That action of Morgan ultimately causes the death of Arthur, who would otherwise be protected by the scabbard's magic in his final battle. On her way out, Morgan saves Arthur's knight named Manassen (Manessen) from certain death when she learns Accolon was Manessen's cousin and enables him to kill his captor. In the same narrative, having been banished from Camelot, Morgan then retires to her lands in the magical kingdom of Gorre and then to her castle near the stronghold of Tauroc (possibly in North Wales). However, her treacherous attempts to bring about Arthur's demise in the Suite are repeatedly frustrated by the king's new sorceress advisor Ninianne (the Lady of the Lake). An iconic case of Morgan's such further and very underhanded plots to kill Arthur in the Post-Vulgate occurs when Morgan sends him a supposed offering of peace in the form of a rich mantle cloak, but Morgan's messenger maiden is made put on the gift first by Ninianne'a advice to Arthur, for "if she dies of it, Morgan will be angrier than at anything else that could happen to her, for she loves her with a very great love." The girl indeed falls dead, and Arthur has her body burned. It is possible that this motif was inspired by classical stories like that how Medea killed her rival for Jason's affection or how Deianira sent a poisoned tunic to Hercules. The reasons for Morgan's hatred of her brother in the Post-Vulgate narrative are never fully explained, other than by just a "natural" extreme antipathy against goodness by the evil that she is an embodiment of. Morgan is often emphasised as promiscuous, even more than her sister Morgause, as she is "so lustful and wanton that a looser [noble]woman could not have been found." In some versions, she also associates with two other lascivious enchantresses, Queen Sebile (Sedile) and the unnamed Queen of Sorestan. Together, the three "knew so much about magic, they enjoyed one another's company and always rode together and ate and drank together." Sebile and Morgan are particularly close companions, working their magic together, but they tend to fall into petty squabbles due to their rivalries and bad tempers, including a conflict between them when they both seduce Hector de Maris in the late 13th-century Prophéties de Merlin. Their friendship is further tested when a quarrel over a handsome widower named Berengier (captured by Sebile after Morgan kidnapped his child) ends in a violent attack by Sebile that leaves Morgan half-dead; Morgan swears revenge, but their relationship is later restored. After Merlin's entombment by the Lady of the Lake, Morgan and her three enchantresses also try to find and rescue him but they fail in that task. Morgan's other allies in the Prophéties include the opponents of chivalry such as Mark and Claudas, and she enlists the help of the latter in her failed attempt to eliminate the Lady of the Lake. Morgan uses her skills in her dealings, amorous or otherwise, with several of Arthur's Knights of the Round Table. It applies in particular to the greatest of them all, Lancelot, whom she alternately tries to seduce and to expose as Guinevere's adulterous lover. Her magic aside, Lancelot is always disempowered in his dealings with Morgan as he could never hurt a woman, which, coupled with her being his king's kin, made the Vulgate's Morgan a perfect foil for Lancelot as "the woman he most feared in the world." As told in the Prose Lancelot, they first meet in her magical domain known as the Val sans Retour (the Vale of No Return), serving as an enchanted prison for false lovers since she took an unnamed knight as her lover but then discovered his affair with another woman. There, Lancelot frees the 250 unfaithful knights entrapped by Morgan, including her former lover Guiomar whom she has turned to stone for his infidelity, but Morgan then captures Lancelot himself under her spell, using a magic ring and keeps him prisoner in the hope Guinevere would then go mad or die of sorrow. She also otherwise torments Guinevere, causing her great distress and making her miserable until the Lady of the Lake gives her a ring that protects her from Morgan's power. Since then, Lancelot becomes Morgan's prime object of sexual desire but he consistently refuses her obsessive advances due to his great love of Guinevere, even as Morgan repeatedly courts, drugs, enchants or imprisons the knight. Their one-sided relationship (as well as interactions between her and Arthur) may evoke that of the goddess Morrígan and the Celtic hero Cú Chulainn. One time, she lets the captive Lancelot go to rescue Gawain when he promises to come back (but also keeping him the company of the most beautiful of her maidens to do "whatever she could to entice him"), and he keeps his word and does return; she eventually releases him altogether after over a year, when his health falters and he is near death. On another occasion, Lancelot captured in Cart Castle (Charyot) by Morgan and her fellow magical queens, each of whom tries to make Lancelot her lover; he refuses to choose either of them and escapes with the help of one of their maidservants, Rocedon. Another of Morgan's illicit love subjects is the rescued-but-abducted young Cornish knight Alexander the Orphan (Alisaunder le Orphelin), a cousin of Tristan and Mark's enemy from a later addition in the Prose Tristan as well as the Prophéties de Merlin, whom she promises to heal but he vows to castrate himself rather than to pleasure her. Nevertheless, Alexander promises to defend her castle of Fair Guard (Belle Garde), where he has been held, for a year and a day, and then dutifully continues to guard it even after the castle gets burned down; this eventually leads to his death. Morgan's other fancied good knights include Alexander's relative Tristan, but her interest in him turns into burning hatred of him and his true love Isolde after he kills her lover as introduced in the Prose Tristan. In this story, Morgan's paramours include Huneson the Bald (Hemison in Malory's version) who is mortally wounded when he attacks the great Cornish knight out of his jealously for her attention; the knight soon dies after returning to her, and the anguished Morgan buries him in a grand tomb. In one variation, Morgan then takes revenge as she takes possession of the lance that was used to kill Huneson, enchants it, and sends it to King Mark of Cornwall, her possible lover, who years later uses it to slay Tristan. In the Prose Tristan, wherein Morgan presents herself as Arthur's full sister, she delivers by Lamorak to Arthur's court a magical drinking horn from which no unfaithful lady can drink without spilling, hoping to disgrace Guinevere by revealing her infidelity, but it is Isolde whose adultery is disclosed instead. With same intent, when Tristan was to be Morgan's champion at a jousting tournament, she also gives him an enchanted shield depicting Arthur, Guinevere and Lancelot to deliver to Camelot in the Prose Tristan. In the Vulgate Queste, after Morgan hosts her nephews Gawain, Mordred and Gaheriet to heal them, Mordred spots the images of Lancelot's passionate love for Guinevere that Lancelot painted on her castle's walls while he was imprisoned there. Morgan shows it to Gawain and his brothers, encouraging them to take action in the name of loyalty to their king, but they decide not to do this. It is said that Morgan concentrates on witchcraft to such degree that she goes to live in seclusion in the exile of far-away forests. She learns more spells than any other woman, gains an ability to transform herself into any animal, and people begin to call her Morgan the Goddess (Morgain-la-déesse, Morgue la dieuesse). In the Post-Vulgate version of Queste del Saint Graal, Lancelot has a vision of Hell where Morgan still will be able to control demons even in afterlife as they torture Guinevere. In one of her castles, Tugan in Garlot, Morgan has hidden a magic book given to her by Merlin, which actually prophesied the deaths of Arthur and Gawain and who would kill them, but no one can read this passage without dying instantly. In the Vulgate La Mort le Roi Artu (The Death of King Arthur, also known as just the Mort Artu), Morgan ceases troubling Arthur and vanishes for a long time, and the king assumes her to be dead. One day, he and Sagramor wander into Morgan's incredibly beautiful castle while lost in a forest, where Arthur is received extremely well and instantly reconciles with his sister. Overjoyed with their reunion, the king allows Morgan to return to Camelot, but she refuses and declares her plan to move to the Isle of Avalon, "where the women live who know all the world's magic," so she can dwell there with these (unspecified) other sorceresses. However, disaster strikes Arthur when the sight of Lancelot's frescoes and Morgan's confession finally convinces him about the truth to the rumours of the two's secret love affair (about which he has been already warned by his nephew Agravain). This leads to a great conflict between Arthur and Lancelot, which brings down the fellowship of the Round Table. At the end of the Vulgate Mort Artu, Morgan is the only one who is recognised among the black-hooded ladies who take the dying Arthur to his final rest and possible revival in Avalon. Depending on the manuscript, she is either the leading lady (usually, being recognised by Griflet as the one holding Arthur's hand as he enters the boat), a subordinate to another who is unnamed, or neither of them are superior. The latter part of the Post-Vulgate versions of Queste and Mort both seem to revert to Morgan's friendly attitude toward Arthur from the end of the Vulgate Cycle, despite the Post-Vulgate' own characterisation of Morgan as thoroughly evil and the earlier fierce hostility between them. As Arthur steps into her boat after Camlann but assures he is not going to return, she makes no mention of Avalon or her intentions when taking him away. His supposed grave is later said to be found mysteriously empty but for his helmet. (Spanish poem La Faula has Morgan explain that by saying the tomb's purpose was to prevent knights from searching for Arthur.) Middle English writer Thomas Malory follows Morgan's portrayals from the Old French prose cycles in his late-15th-century seminal work of the selective compilation book Le Morte d'Arthur (The Death of Arthur), though he reduces her in role and detail of characterisation, in particular either removing or limiting her traditions of healing and prophecy, and making her more consistently and inherently evil than she is in most of his sources, just as he makes Merlin more good. He also diminishes Morgan's conflict with Guinevere, since there is no mention of Guiomar and instead Accolon ("of Gaul") is her first named lover in a much abbreviated version of his story, but does not clarify Morgan's motivations for her very antagonistic behaviour against Arthur. Overall, up until the war between Arthur and Lancelot and the rebellion of Mordred, it is the evil and chaotic Morgan who remains the main and constant source of direct and indirect threat to the realm.[f] In Malory's backstory, Morgan has studied astrology as well as nigremancie (which might actually mean black magic in general rather than "necromancy") in the nunnery where she was raised, before being married to Urien (Uriens) as a young teenager; in this narrative she did not study with Merlin. Unlike Malory's good sorceress Nimue, Morgan deals mostly in "black" rather than "white" magic, employed usually through enchantments and potions. Her powers, however, seem to be inspired by fairy magic of Celtic folklore rather than by medieval Christian demonology. Morgan is widely feared and hated, so much that "many knights wished her burnt." She is now the leader of the four (not three) witch queens who capture Lancelot (the others being the Queen of the Northgales, the Queen of Eastland, and the Queen of the Outer Isles). In an episode that had been first introduced by the anonymous writer of the earlier Prose Lancelot, Lancelot rescues Elaine of Corbenic from being trapped in an enchanted boiling bath by Morgan and the Queen of the Northgales, both envious of Elaine's great beauty (echoing Circe's treatment of Scylla). Malory also reused the magic mantle assassination plot from the Huth Merlin in a slightly modified form, resulting in Morgan's damsel instantly burnt to cinders by its curse when she is forced to take it on. In one of later episodes, Morgan plots an elaborate ambush in "The Book of Sir Tristram de Lyons", after learning of the death of one of her favourites in a tournament, but Tristan ends up killing or routing thirty of her knights. Malory mentions Arthur's attempts to conquer at least one of her castles, which originally had been his own gift to her, and which he could not retake (apparently due to magical defences). Nevertheless, despite all of their prior hostility towards each other and her numerous designs directed against Arthur personally (and his own promise to get a terrible revenge on her as long as he lives), she is still redeemed and is one of the four grieving enchantress queens (the others being Nimue, marking the end of conflict between her and Morgan, and two of Morgan's allies, the Queen of the Northgales and the Queen of the Wasteland) who arrive in a black boat to transport the wounded king to Avalon in the end. Unlike in the French and earlier stories on which Le Morte d'Arthur is based, and where Morgan and Arthur usually would either have first made peace or have just never fought to begin with, here her change of attitude towards him is sudden and unexplained (similar to the Post-Vulgate). Arthur is last seen in Morgan's lap, with her lament of sorrow referring to him as her "dear brother" (dere brothir), as they disappear from the work's narrative together. In the c. 1400 English poem Alliterative Morte Arthure, Morgan appears in Arthur's dream as Lady Fortune (that is, the goddess Fortuna) with the Wheel of Fortune to warn Arthur prior to his fatal final battle, foretelling his death. She also appears in some other English texts, such as the early-13th-century Anglo-Norman Roman de Waldef where she is only "name-dropped" as a minor character. Middle English romance Arthour and Merlin, written around 1270, casts a villainous Morgan in the role of the Lady of the Lake and gives her a brother named Morganor as an illegitimate son of King Urien; her wondrous castle Palaus is built mostly of crystal and glass. Conversely, a 14th-century Middle English version of the Vulgate Mort Artu known as the Stanzaic Morte Arthur makes Morgan an unquestionably good sister of Arthur, concerned only about his honour in regard to the affair of Lancelot and Guinevere. Entering her boat (she is not named in the scene, but addresses him as her brother), Arthur believes he is going to be healed, yet his tomb is later discovered by Bedivere. At the end of the 14th-century Middle English romance Sir Gawain and the Green Knight, one of the best-known Arthurian tales, it is revealed that the entire Green Knight plot has been instigated by Gawain's aunt, the goddess Morgan le Fay (Morgue la Faye, Morgne þe goddes), whose prior mentorship by Merlin is mentioned. Here, she is an ambiguous trickster who takes an appearance of an elderly woman (contrasting from the beautiful Lady Bertilak in a role evoking the loathly lady tradition), as a test for Arthur and his knights and to frighten Guinevere to death. Morgan's importance to this particular narrative has been disputed and called a deus ex machina and simply an artistic device to further connect Gawain's episode to the Arthurian legend, but some regard her as a central character and the driving force of the plot. Opinions are also divided regarding Morgan's intentions and whether she succeeds or fails, and how the story's shapeshifting and enigmatic Morgan might be, or might be not, also Lady Bertilak herself.[g] Morgan further turns up frequently throughout the Western European literature of the High and Late Middle Ages, as well as of the Renaissance. She appears in a variety of roles, generally appearing in works related to the literary cycles of Arthur (the Matter of Britain) or Charlemagne (the Matter of France) and written mostly in various Romance languages and dialects, especially still in France but also in Italy, Spain and elsewhere. In the case of Spain, even public edicts dating from the end of the 14th and the beginning of the 15th century tell of the belief in Morgan continuing to enchant and imprison people at Tintagel and in "the Valley of False Trickery". Later standalone romances often feature Morgan as a lover and benefactor of various heroes, and yet she can also be their opponent, especially when abducting those who turned down her amorous offers or working to separate true lovers. Such texts may also introduce her additional offspring or alternate siblings, or connect her closer with the figure of the Lady of the Lake. For instance, the fairy queen Lady Morgan (Dame Morgue, Morgue li fee) shows up in Adam de la Halle's late-13th-century French farce Jeu de la feuillée, in which she visits a contemporary Arras. She arrives accompanied by two of her fay sisters named Arsile and Maglore to dispense enchantment gifts to and curses upon several characters including the author himself, and in the course of the story reverts her love interest in the local mortal (and unfaithful) knight Robert to her previous lover Hellequin (Hellekin), a demonic prince of Faerie who has been trying to woo her back. Hellequin's character in this case may be connected in some way to Arthur, who like him sometimes also figures as the leader of the Wild Hunt. In Thomas III of Saluzzo's Le Chevalier Errant, the fairy Morgan (la fée Morgane) holds the eponymous Wandering Knight captive inside a magnificent castle in her forest realm Païenie ('Pagania'), until messengers from her brother Arthur arrive with a request to lift her enchantment and let him go, to which she agrees. Loosely drawing from the Vulgate Cycle, the Old French anonymous Li Romans de Claris et Laris better known as just Claris and Laris (c. 1270), has its Morgan (Morgane la Faye) as a fairy sister of Arthur as well as a former pupil of the Lady of Lake, Viviane. Ever lascivious and sexual, Morgan lives in a splendid enchanted castle in the wilderness (identified as Brocéliande in a later manuscript) with twelve other beautiful fairy ladies including the sorceress Madoine. There, they lure and ensnare many hundreds of young and attractive knights, who then spend the rest of their lives in the palace: Morgana made several conquests, and of course, many enemies amongst the damsels who found themselves forsaken by their disloyal Knights. The fairy gave proofs of her partial preference to the great Lancelot of the Lake, which Genievre, Arthur's beauteous consort, bore very impatiently. At last, whether she took a dislike to the court, or the court to her, she thought proper to retire to the forest we speak of; where, at her command, her invisible agents erected an enchanted palace. She was followed in her delicious retreats by young and beautiful Varlets, Esquires, and as many Knights as preferred the inglorious, but delightful pleasures that awaited them with Morgana, to the honourable toils of knight-errantry. The fairy was also constantly attended by spirits, and other familiars, who gave her an exact account of what passed within a certain distance from her palace, and assisted her in inveigling every traveller whom she best thought worth her notice. A human Morgan is named Dioneta in the 14th-century Welsh fragment known as The Birth of Arthur, where she is a sister of both Gwyar (Morgause) and Gwalchmei (Gawain), as well as of the other sisters Gracia and Graeria, and is sent off by Uther to Avallach (Avalon). The island of Avalon is often described as an otherworldly place ruled by Morgan in other later texts from all over Western Europe, especially these written in Iberia. In the 14th-century French Crusadic fantasy Le Bâtard de Bouillon, the island kingdom of Arthur and his fairy sister Morgan the Beautiful is hidden by a cloud in the Red Sea, where it is visited by King Bauduins (Baldwin II of Jerusalem). In his 14th-century Catalan poem La faula, Guillem de Torroella writes about having visited the Enchanted Isle and met Arthur who has been brought back to life by the fay Morgan (Morgan la feya, Morguan la fea) and they both are now forever young due to the power of the Holy Grail. In the 15th-century Valencian romance Tirant lo Blanc, the noble Queen Morgan searches the world for her missing brother. Finally finding him entranced in Constantinople, Morgan brings Arthur back to his senses by removing Excalibur from his hands, after which they celebrate and leave to Avalon. The Castilian Arderique begins where the Mort Artu ends, that is with the departure and disappearance of Arthur and his sister Morgaina, described there as a fairy necromancer, after the battle with Mordred. Another Spanish work, Francisco de Enciso Zárate's Florambel de Lucea (1532), features a later appearance of Arthur together with his sister Morgaina, "better known as Morgana the fairy" (fada Morgana), who explains how she saved her brother and gifts Excalibur to the eponymous hero Florambel. In Tristán de Leonis, Morgana offers her love to Tristan. In the rondalla ('folk tale' in Catalan) La fada Morgana, the protagonist Joana ends up marrying the fairy queen Morgana's son named Beuteusell after passing his mother's test with his help. In the legend of the Paladins of Charlemagne, she is most associated with one of the Paladins, the Danish folklore hero Ogier the Dane: following his initial epics, when he is 100 years old, the fairy queen Morgan restores him to his youthful form but removes his memory, then takes him to her mystical island palace in Avalon (where Arthur and Gawain are also still alive) to be her lover for 200 years. She later protects him during his adventures in the mortal world as he defends France from Muslim invasion, before his eventual return to Avalon. In some accounts, Ogier begets her two sons, including Marlyn (Meurvin). In the 14th-century pseudo-chronicle Ly Myreur des Histors written by the French-Belgian author Jean d'Outremeuse, one of their sons is a giant and they live in a palace made of jewels. In the 13th-century chanson de geste story of another Paladin, Huon of Bordeaux, Morgan is a protector of the eponymous hero and the mother of the fairy king Oberon by none other than Julius Caesar. In the 14th-century Ogier le Danois, a prose redaction of the epic poem Roman d'Ogier, Morgue la Fée lives in her palace in Avalon together with Arthur and Oberon, who both seem to be her brothers. Variants of Ogier's and Huon's stories typically involve Morgan, Arthur, and Oberon (Auberon) all living in a fairyland where time passes much slower than in human world. Such works include the 14th century's French Tristan de Nanteuil and the Chanson de Lion de Bourges, the 15th-century French Mabrien, and John Bourchier's 16th-century English The Boke of Duke Huon of Burdeux in which Arthur's sister Morgan is mother of not Oberon but Merlin. In another French chanson de geste, the early-13th-century La Bataille Loquifer, the fays Morgan (Morgue) and her sister Marsion (Marrion) bring the Saracen hero Renoart (Renouart, Rainouart) to Avalon, where Arthur is the king. Renoart falls in love with Morgan and impregnates her with his illegitimate son named Corbon (Corbans), "a live devil who did nothing but evil." When Renoart jilts her and escapes to rescue his other son Maileffer, Morgan sends her demonic monster servant Kapalu (character derived from the Welsh legends' Cath Palug) after him; the shipwrecked Renoart ends up luckily rescued by a mermaid. The 14th-century Italian romance titled La Pulzella Gaia (The Merry Maiden) features the titular beautiful young fairy daughter of Morgana (Italian version of Morgan's name, here too also a sister of the Lady of the Lake) with Hemison. In her own tale, Morgana's daughter defeats Gawain (Galvano) in her giant serpent form before becoming his lover; she and her fairy army then save Gawain from the jealous Guinevere, who wants Gawain dead after having been spurned by him. She then herself is imprisoned in a magical torment in her mother's glass-and-diamond magical castle Pela-Orso, because of how Morgana wanted to force her to marry Tristan. Eventually, Gawain storms the castle after three years of siege and frees her from a cursed dungeon, also capturing her tyrannical mother for the same punishment. The 15th-century Italian compilation of Arthur and Tristan legends, La Tavola Ritonda (The Round Table), too makes Morgan a sister to the Lady of the Lake as well as to Arthur (about the fate of whom it says Morgan "brought him away to a little island in the sea; and there he died of his wounds, and the fairy buried him on that island"). It is based on the French prose romances, but here Morgan is a prophetic figure whose main role is to ensure the fulfilment of fate. Her daughter also appears, as Gaia Donzella, in the Tavola Ritonda, where she is kidnapped by the knight Burletta of the Desert (Burletta della Diserta) who wants to rape her but she is rescued by Lancelot. The Italian Morgana appears in a number of cantari poems of the 14th to 15th century. Some of these are original new episodes, such as the Cantari di Tristano group's Cantare di Astore e Morgana, in which Morgana heals the wounded Hector de Maris (Astore) but turns him evil, and gives him an armour made in Hell as well as a magical ship in her revenge plot against Gawain as well as Arthur himself, and the Cantari del Falso Scudo that features her evil fairy son, the Knight of the False Shield, who ends up slain by Galahad. Other include Lasencis, a standalone version of the Tavola Ritonda story of the eponymous Corsican knight armed by Morgan with enchanted weapons to avenge his brother killed by Lancelot, and a yet another telling of the familiar story of Morgana's good fairy daughter titled the Ponzela Gaia. Evangelista Fossa combined and retold some of those in his Innamoramento di Galvano (Gawain Falling in Love, c. 1494). Morgan le Fay, or Fata Morgana in Italian, has been in particular associated with Sicily as a location of her enchanted realm in the mythological landscape of medieval Europe (at least since the Norman conquest of southern Italy), and local folklore describes her as living in a magical castle located at or floating over Mount Etna. As such she gave her name to the form of mirage common off the shores of Sicily, the Fata Morgana, since the 14th century. According to a local legend, Fata Morgana wondrously appeared to the Norman leader Roger of Hauteville to offer him her help in freeing Sicily from Muslim domination, before he (historically) did so in 1060. Other references linking Avalon to Sicily can be found in Otia Imperialia (c. 1211) and La faula, as well as in Breton and Provençal literature, for example in the aforementioned Jaufre and La Bataille Loquifer. The 13th-century Chrétien-inspired romance Floriant et Florete places Morgan's secret mountain castle of Mongibel (also Montgibel or Montegibel, derived from the Arabic name for Etna), where, in the role of a fairy godmother, Morgane and two other fays spirit away and raises Floriant, a son of a murdered Sicilian king and the hero of the story. Floriant, with the help of her magic ship, eventually reunites with Morgane at her castle when he returns there with his wife Florete. The 15th-century French romance La Chevalier du Papegau (The Knight of the Parrot) gives Morgaine the Fairy of Montgibel (Morgaine, la fée de Montgibel, as she is also known in Floriant et Florete) a sister known as the Lady Without Pride (la Dame sans Orgueil), whom Arthur saves from the evil Knight of the Wasteland (similar to the story in the Tavola Ritonda). Meanwhile, the Fastnachtspiel (Ain Hupsches Vasnacht Spill von Künig Artus), a German retelling of the enchanted horn episode, moved Morgan's Mediterranean Sea island domain to the east of Sicily, referring to her only as the Queen of Cyprus. During the Italian Renaissance, Morgan has been primarily featured in relation to the cycle of epic poems of Orlando (based on Roland of the historical Charlemagne). In Matteo Maria Boiardo's late-15th-century Orlando Innamorato, fata Morgana (initially as lady Fortune) is beautiful but wicked fairy enchantress, a sister of King Arthur and a pupil of Merlin. Morgana lives in her paradise-like garden in a crystal cavern under a lake, plotting to eventually destroy the entire world. There, she abducts her favourites until she is thwarted by Orlando who defeats, chases and captures Morgana, destroying her underwater prison and letting her keep only one of her forced lovers, a knight named Ziliante. In Ludovico Ariosto's continuation of this tale, Orlando Furioso (1532), Morgana is revealed as a twin sister of two other sorceresses, the good Logistilla and the evil Alcina; Orlando again defeats Morgana, rescuing Ziliante who has been turned into a dragon, and forces Morgana to swear by her lord Demogorgon to abandon her plots. The story also features the medieval motif where uses a magic horn to convince Arthur of the infidelity of his queen (Geneura), here successfully. Bernardo Tasso's L'Amadigi (1560) further introduces Morgana's three daughters: Carvilia, Morganetta, and Nivetta, themselves temptresses of knights. Morgan's other 16th-century appearances include these of Morgue la fée in François Rabelais' French satirical fantasy novel Les grandes chroniques du grand et énorme géant Gargantua et il publie Pantagruel (1532) and of the good Morgana in Erasmo di Valvasone's Italian didactic poem La caccia (1591). In Edmund Spenser's English epic poem The Faerie Queene (1590), Argante (Layamon's name for Morgan) is lustful giantess queen of the "secret Ile", evoking the Post-Vulgate story of Morgan's kidnapping of Sir Alexander. It also features three other counterpart characters: Acrasia, Duessa, and Malecasta, all representing different themes from Malory's description of Morgan. Morgan might have also inspired the characters of the healer Loosepaine and the fay Oriande in the Scots language poem Greysteil, possibly originally written in 15th-century England. Modern culture The character of Morgan has become ubiquitous in works of the modern era, spanning fantasy, historical fiction and other genres across various mediums, especially since the mid-20th century. See also Notes References External links |
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[SOURCE: https://en.wikipedia.org/wiki/Shabak_people#Religious_beliefs] | [TOKENS: 1737] |
Contents Shabaks Shabaks (Arabic: الشبك, Kurdish: شەبەک, romanized: Şebek) are a group native to the Nineveh Plains in Iraq. They speak Shabaki, a branch of the Zaza–Gorani languages, and largely follow Shia Islam. Their ethnic origin is uncertain and disputed, although they were largely considered Kurds by scholars. Origins The origins of the word Shabak are not clear. One theory is that Shabak is an Arabic word شبك that means intertwine, indicating that the Shabak people originated as a confederation of many tribes of different ethnicities. Others claim that the word Shabak came from the Persian "shah" and Turkish "bek", meaning "master of kings", eventually being Arabized to "Shabak". Austin Henry Layard considered Shabaks to be descendants of Kurds who originated in Iran, and believed that they possibly had affinities with the Ali-Ilahis. Anastase-Marie al-Karmali also argued that Shabaks were ethnic Kurds. Another theory claimed that Shabaks were local ethnic Kurds who were influenced by many cultures due to the ethnic and religious diversity of the Nineveh Plains, which was historically one of the most diverse regions in Iraq. In 2019, Hussein al-Shabaki, a Shabak politician, claimed that the Shabaks were simply Kurds of various Kurdish tribes, and that the term "Shabak" in reality was the historical name of the region they lived in. Another theory suggests that the Shabaks originated from Anatolian Qizilbash Turkomans, who were forced to settle in the Mosul area after the defeat of Ismail I by the Ottomans at the Battle of Chaldiran. Other theories supported the Qizilbash theory, although claimed that the Shabaks specifically descended from Qizilbash Kurds, as the Qizilbash confederation did include Kurds and other Non-Turkic minorities. Historians also stated that it was possible that the Shabaks descended from an ancient Kurdish tribe known as "Shanbakiyya", and also added that it was possible that the Shabaks had affinities with Shabankara. In the 1990s, Turkish sources began denying the existence of the Shabaks, claiming they were simply part of the Iraqi Turkmen. Stephen Hemsley Longrigg, the historian of the British mandate of Iraq, described the language of the Shabaks as "a Kurdish dialect" and their religion as "a heretical type of Shi'ism". Most Shabaks belonged to the Kurdish tribes of Zangana, Bajalan, Rojbayani, Dawudi, Lak, Omerbal, Shekak, and Zirari, among others. Some individual Shabak families were of Arab or Turkmen origin who assimilated due to living in close proximity. The Shabaks speak Shabaki, a branch of the Gorani languages. However, some Shabaks claimed to be Kurds who spoke Hawrami, implying that Shabaki was a regional identity rather than ethnic or linguistic. A significant amount of Shabaks also spoke Kurmanji as a first language, likely due to living amongst Yazidis. Many Shabaks also learned and spoke Sorani. Turkish was spoken by religious elders in Shabakism, but none of the ordinary Shabaks themselves. Shabakism later declined as a religion. Shabaks also spoke Arabic due to its official status in Iraq, and some lost their language completely to Arabization. There was the Babawat community in Sinjar, sometimes considered Shabak, other times considered a Yazidi group, Other times, the Babawat were described as not being any different from the Shabak. Deportation and forced assimilation After the 1987 census, the Iraqi regime declared Shabaks to be Arabs. Many Shabak community leaders protested, insisting that they were Kurds, after which the Iraqi regime began a campaign against Shabaks. Many Shabaks chose to abandon their traditions, stop identifying with Kurds, and assimilate into the Arab identity to avoid being targeted. The Iraqi government fabricated lineage documents to portray the Shabaks as Arabs. The campaign included both deportation and forced assimilation, and many Shabaks were relocated to concentration camps near the Harir area located to the north of Erbil. An estimated 1,160 Shabaks were killed during this period. In addition, increasing efforts have been made to force the Shabaks to suppress their own identity in favour of being Arab. The Iraqi government's efforts of forced assimilation, Arabization, and religious persecution put the Shabaks under increasing threat. A researcher interviewed a Shabak survivor, who stated that "the government said we are Arabs, not Kurds; but if we are, why did they deport us from our homes?" Shabak politician Salim al-Shabaki, a Shabak representative in the Iraqi parliament, openly declared that "the Shabaks are part of the Kurdish nation." Furthermore, he claimed that Shabaks were direct descendants of the original Kurds. After the end of Baathist Iraq, the newer Shia-dominated Iraqi government maintained the practice of attempting to distance Shabaks from Kurds. Politically, the Shabaks who identified as Kurds supported the Kurdistan Region and mostly supported the KDP, while the Shabaks who identified as a distinct group supported the central Iraqi government and mostly supported Iran-backed militias. Hunain al-Qaddo, a Shabak politician who advocated that Shabaks were a distinct ethnic group, claimed that "the Peshmerga have no genuine interest in protecting his community, and that Kurdish security forces are more interested in controlling Shabaks and their leaders than protecting them." Meanwhile, Salim al-Shabaki claimed that it was actually the Iraqi Shia militias who had no interest in protecting the Shabaks and only wanted to distance Shabaks from other Kurds. He also accused the Shia militias of committing atrocities against Shabaks who did not benefit their agenda. After the decline of Shabakism during the Iraqi civil war, most Shabaks were Muslims, with a significant Yarsani minority and a small Christian minority. Shabak Muslims were around 70% Shia and 30% Sunni. Religion was a factor in the identification of Shabaks. The Shia Shabaks were divided between those who identified as Kurds and those who identified as a separate group, while the Sunni and Yarsani Shabaks identified as Kurds. Some of them migrated to the KRG and integrated well. The Shabaks who identified as Kurds sided with the KRG and mostly supported the KDP. The Shabaks who identified as a distinct ethnic group supported the Iran-backed militias. In the 1990s and 2000s, Shabaks were also targets of Turkification by Turkish groups and their Iraqi Turkmen allies. The Iraqi Turkmen National Party (ITMP) actively ran a campaign aimed at convincing Shabaks that they were Turks. In addition to Shabaks, the ITMP claimed that all Yarsanis were Turks, and that Yarsanism was a Turkic religion. After the Anfal campaign, the ITMP received aid consisting of food packages from Turkey. The ITMP caused controversy as they did not give any aid to the Shabak victims unless they signed documents agreeing that they were Turks. By 2003, the Turkification attempts had stopped, as they never had a lasting effect on the Shabaks. Shabaks had tensions with Sunni Arabs, which was worsened by Saddam Hussein, and further worsened by the rise of the Islamic State in 2014. The situation of Shabaks and Feyli Kurds in Iraq was identical, and both groups complained about being alienated from Sunni Kurds who saw them as Shia, and from Shia Arabs who saw them as Kurds. During the 2017 Kurdistan independence referendum, there were Shabaks who supported independence and called for their native region in the Nineveh Plains to be included. Settlements List of Shabak–majority settlements in the Nineveh Plains: List of mixed settlements in the Nineveh Plains: As of March 2019, all of the above settlements are under federal control and are disputed territories of Northern Iraq. References Further reading |
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[SOURCE: https://en.wikipedia.org/wiki/Animal#cite_note-174] | [TOKENS: 6011] |
Contents Animal Animals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia (/ˌænɪˈmeɪliə/). With few exceptions, animals consume organic material, breathe oxygen, have myocytes and are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Animals form a clade, meaning that they arose from a single common ancestor. Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology, and the study of animal behaviour is known as ethology. The animal kingdom is divided into five major clades, namely Porifera, Ctenophora, Placozoa, Cnidaria and Bilateria. Most living animal species belong to the clade Bilateria, a highly proliferative clade whose members have a bilaterally symmetric and significantly cephalised body plan, and the vast majority of bilaterians belong to two large clades: the protostomes, which includes organisms such as arthropods, molluscs, flatworms, annelids and nematodes; and the deuterostomes, which include echinoderms, hemichordates and chordates, the latter of which contains the vertebrates. The much smaller basal phylum Xenacoelomorpha have an uncertain position within Bilateria. Animals first appeared in the fossil record in the late Cryogenian period and diversified in the subsequent Ediacaran period in what is known as the Avalon explosion. Nearly all modern animal phyla first appeared in the fossil record as marine species during the Cambrian explosion, which began around 539 million years ago (Mya), and most classes during the Ordovician radiation 485.4 Mya. Common to all living animals, 6,331 groups of genes have been identified that may have arisen from a single common ancestor that lived about 650 Mya during the Cryogenian period. Historically, Aristotle divided animals into those with blood and those without. Carl Linnaeus created the first hierarchical biological classification for animals in 1758 with his Systema Naturae, which Jean-Baptiste Lamarck expanded into 14 phyla by 1809. In 1874, Ernst Haeckel divided the animal kingdom into the multicellular Metazoa (now synonymous with Animalia) and the Protozoa, single-celled organisms no longer considered animals. In modern times, the biological classification of animals relies on advanced techniques, such as molecular phylogenetics, which are effective at demonstrating the evolutionary relationships between taxa. Humans make use of many other animal species for food (including meat, eggs, and dairy products), for materials (such as leather, fur, and wool), as pets and as working animals for transportation, and services. Dogs, the first domesticated animal, have been used in hunting, in security and in warfare, as have horses, pigeons and birds of prey; while other terrestrial and aquatic animals are hunted for sports, trophies or profits. Non-human animals are also an important cultural element of human evolution, having appeared in cave arts and totems since the earliest times, and are frequently featured in mythology, religion, arts, literature, heraldry, politics, and sports. Etymology The word animal comes from the Latin noun animal of the same meaning, which is itself derived from Latin animalis 'having breath or soul'. The biological definition includes all members of the kingdom Animalia. In colloquial usage, the term animal is often used to refer only to nonhuman animals. The term metazoa is derived from Ancient Greek μετα meta 'after' (in biology, the prefix meta- stands for 'later') and ζῷᾰ zōia 'animals', plural of ζῷον zōion 'animal'. A metazoan is any member of the group Metazoa. Characteristics Animals have several characteristics that they share with other living things. Animals are eukaryotic, multicellular, and aerobic, as are plants and fungi. Unlike plants and algae, which produce their own food, animals cannot produce their own food, a feature they share with fungi. Animals ingest organic material and digest it internally. Animals have structural characteristics that set them apart from all other living things: Typically, there is an internal digestive chamber with either one opening (in Ctenophora, Cnidaria, and flatworms) or two openings (in most bilaterians). Animal development is controlled by Hox genes, which signal the times and places to develop structures such as body segments and limbs. During development, the animal extracellular matrix forms a relatively flexible framework upon which cells can move about and be reorganised into specialised tissues and organs, making the formation of complex structures possible, and allowing cells to be differentiated. The extracellular matrix may be calcified, forming structures such as shells, bones, and spicules. In contrast, the cells of other multicellular organisms (primarily algae, plants, and fungi) are held in place by cell walls, and so develop by progressive growth. Nearly all animals make use of some form of sexual reproduction. They produce haploid gametes by meiosis; the smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova. These fuse to form zygotes, which develop via mitosis into a hollow sphere, called a blastula. In sponges, blastula larvae swim to a new location, attach to the seabed, and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber and two separate germ layers, an external ectoderm and an internal endoderm. In most cases, a third germ layer, the mesoderm, also develops between them. These germ layers then differentiate to form tissues and organs. Repeated instances of mating with a close relative during sexual reproduction generally leads to inbreeding depression within a population due to the increased prevalence of harmful recessive traits. Animals have evolved numerous mechanisms for avoiding close inbreeding. Some animals are capable of asexual reproduction, which often results in a genetic clone of the parent. This may take place through fragmentation; budding, such as in Hydra and other cnidarians; or parthenogenesis, where fertile eggs are produced without mating, such as in aphids. Ecology Animals are categorised into ecological groups depending on their trophic levels and how they consume organic material. Such groupings include carnivores (further divided into subcategories such as piscivores, insectivores, ovivores, etc.), herbivores (subcategorised into folivores, graminivores, frugivores, granivores, nectarivores, algivores, etc.), omnivores, fungivores, scavengers/detritivores, and parasites. Interactions between animals of each biome form complex food webs within that ecosystem. In carnivorous or omnivorous species, predation is a consumer–resource interaction where the predator feeds on another organism, its prey, who often evolves anti-predator adaptations to avoid being fed upon. Selective pressures imposed on one another lead to an evolutionary arms race between predator and prey, resulting in various antagonistic/competitive coevolutions. Almost all multicellular predators are animals. Some consumers use multiple methods; for example, in parasitoid wasps, the larvae feed on the hosts' living tissues, killing them in the process, but the adults primarily consume nectar from flowers. Other animals may have very specific feeding behaviours, such as hawksbill sea turtles which mainly eat sponges. Most animals rely on biomass and bioenergy produced by plants and phytoplanktons (collectively called producers) through photosynthesis. Herbivores, as primary consumers, eat the plant material directly to digest and absorb the nutrients, while carnivores and other animals on higher trophic levels indirectly acquire the nutrients by eating the herbivores or other animals that have eaten the herbivores. Animals oxidise carbohydrates, lipids, proteins and other biomolecules in cellular respiration, which allows the animal to grow and to sustain basal metabolism and fuel other biological processes such as locomotion. Some benthic animals living close to hydrothermal vents and cold seeps on the dark sea floor consume organic matter produced through chemosynthesis (via oxidising inorganic compounds such as hydrogen sulfide) by archaea and bacteria. Animals originated in the ocean; all extant animal phyla, except for Micrognathozoa and Onychophora, feature at least some marine species. However, several lineages of arthropods begun to colonise land around the same time as land plants, probably between 510 and 471 million years ago, during the Late Cambrian or Early Ordovician. Vertebrates such as the lobe-finned fish Tiktaalik started to move on to land in the late Devonian, about 375 million years ago. Other notable animal groups that colonized land environments are Mollusca, Platyhelmintha, Annelida, Tardigrada, Onychophora, Rotifera, Nematoda. Animals occupy virtually all of earth's habitats and microhabitats, with faunas adapted to salt water, hydrothermal vents, fresh water, hot springs, swamps, forests, pastures, deserts, air, and the interiors of other organisms. Animals are however not particularly heat tolerant; very few of them can survive at constant temperatures above 50 °C (122 °F) or in the most extreme cold deserts of continental Antarctica. The collective global geomorphic influence of animals on the processes shaping the Earth's surface remains largely understudied, with most studies limited to individual species and well-known exemplars. Diversity The blue whale (Balaenoptera musculus) is the largest animal that has ever lived, weighing up to 190 tonnes and measuring up to 33.6 metres (110 ft) long. The largest extant terrestrial animal is the African bush elephant (Loxodonta africana), weighing up to 12.25 tonnes and measuring up to 10.67 metres (35.0 ft) long. The largest terrestrial animals that ever lived were titanosaur sauropod dinosaurs such as Argentinosaurus, which may have weighed as much as 73 tonnes, and Supersaurus which may have reached 39 metres. Several animals are microscopic; some Myxozoa (obligate parasites within the Cnidaria) never grow larger than 20 μm, and one of the smallest species (Myxobolus shekel) is no more than 8.5 μm when fully grown. The following table lists estimated numbers of described extant species for the major animal phyla, along with their principal habitats (terrestrial, fresh water, and marine), and free-living or parasitic ways of life. Species estimates shown here are based on numbers described scientifically; much larger estimates have been calculated based on various means of prediction, and these can vary wildly. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000–20,000; 500,000; 10 million; and 100 million. Using patterns within the taxonomic hierarchy, the total number of animal species—including those not yet described—was calculated to be about 7.77 million in 2011.[a] 3,000–6,500 4,000–25,000 Evolutionary origin Evidence of animals is found as long ago as the Cryogenian period. 24-Isopropylcholestane (24-ipc) has been found in rocks from roughly 650 million years ago; it is only produced by sponges and pelagophyte algae. Its likely origin is from sponges based on molecular clock estimates for the origin of 24-ipc production in both groups. Analyses of pelagophyte algae consistently recover a Phanerozoic origin, while analyses of sponges recover a Neoproterozoic origin, consistent with the appearance of 24-ipc in the fossil record. The first body fossils of animals appear in the Ediacaran, represented by forms such as Charnia and Spriggina. It had long been doubted whether these fossils truly represented animals, but the discovery of the animal lipid cholesterol in fossils of Dickinsonia establishes their nature. Animals are thought to have originated under low-oxygen conditions, suggesting that they were capable of living entirely by anaerobic respiration, but as they became specialised for aerobic metabolism they became fully dependent on oxygen in their environments. Many animal phyla first appear in the fossil record during the Cambrian explosion, starting about 539 million years ago, in beds such as the Burgess Shale. Extant phyla in these rocks include molluscs, brachiopods, onychophorans, tardigrades, arthropods, echinoderms and hemichordates, along with numerous now-extinct forms such as the predatory Anomalocaris. The apparent suddenness of the event may however be an artefact of the fossil record, rather than showing that all these animals appeared simultaneously. That view is supported by the discovery of Auroralumina attenboroughii, the earliest known Ediacaran crown-group cnidarian (557–562 mya, some 20 million years before the Cambrian explosion) from Charnwood Forest, England. It is thought to be one of the earliest predators, catching small prey with its nematocysts as modern cnidarians do. Some palaeontologists have suggested that animals appeared much earlier than the Cambrian explosion, possibly as early as 1 billion years ago. Early fossils that might represent animals appear for example in the 665-million-year-old rocks of the Trezona Formation of South Australia. These fossils are interpreted as most probably being early sponges. Trace fossils such as tracks and burrows found in the Tonian period (from 1 gya) may indicate the presence of triploblastic worm-like animals, roughly as large (about 5 mm wide) and complex as earthworms. However, similar tracks are produced by the giant single-celled protist Gromia sphaerica, so the Tonian trace fossils may not indicate early animal evolution. Around the same time, the layered mats of microorganisms called stromatolites decreased in diversity, perhaps due to grazing by newly evolved animals. Objects such as sediment-filled tubes that resemble trace fossils of the burrows of wormlike animals have been found in 1.2 gya rocks in North America, in 1.5 gya rocks in Australia and North America, and in 1.7 gya rocks in Australia. Their interpretation as having an animal origin is disputed, as they might be water-escape or other structures. Phylogeny Animals are monophyletic, meaning they are derived from a common ancestor. Animals are the sister group to the choanoflagellates, with which they form the Choanozoa. Ros-Rocher and colleagues (2021) trace the origins of animals to unicellular ancestors, providing the external phylogeny shown in the cladogram. Uncertainty of relationships is indicated with dashed lines. The animal clade had certainly originated by 650 mya, and may have come into being as much as 800 mya, based on molecular clock evidence for different phyla. Holomycota (inc. fungi) Ichthyosporea Pluriformea Filasterea The relationships at the base of the animal tree have been debated. Other than Ctenophora, the Bilateria and Cnidaria are the only groups with symmetry, and other evidence shows they are closely related. In addition to sponges, Placozoa has no symmetry and was often considered a "missing link" between protists and multicellular animals. The presence of hox genes in Placozoa shows that they were once more complex. The Porifera (sponges) have long been assumed to be sister to the rest of the animals, but there is evidence that the Ctenophora may be in that position. Molecular phylogenetics has supported both the sponge-sister and ctenophore-sister hypotheses. In 2017, Roberto Feuda and colleagues, using amino acid differences, presented both, with the following cladogram for the sponge-sister view that they supported (their ctenophore-sister tree simply interchanging the places of ctenophores and sponges): Porifera Ctenophora Placozoa Cnidaria Bilateria Conversely, a 2023 study by Darrin Schultz and colleagues uses ancient gene linkages to construct the following ctenophore-sister phylogeny: Ctenophora Porifera Placozoa Cnidaria Bilateria Sponges are physically very distinct from other animals, and were long thought to have diverged first, representing the oldest animal phylum and forming a sister clade to all other animals. Despite their morphological dissimilarity with all other animals, genetic evidence suggests sponges may be more closely related to other animals than the comb jellies are. Sponges lack the complex organisation found in most other animal phyla; their cells are differentiated, but in most cases not organised into distinct tissues, unlike all other animals. They typically feed by drawing in water through pores, filtering out small particles of food. The Ctenophora and Cnidaria are radially symmetric and have digestive chambers with a single opening, which serves as both mouth and anus. Animals in both phyla have distinct tissues, but these are not organised into discrete organs. They are diploblastic, having only two main germ layers, ectoderm and endoderm. The tiny placozoans have no permanent digestive chamber and no symmetry; they superficially resemble amoebae. Their phylogeny is poorly defined, and under active research. The remaining animals, the great majority—comprising some 29 phyla and over a million species—form the Bilateria clade, which have a bilaterally symmetric body plan. The Bilateria are triploblastic, with three well-developed germ layers, and their tissues form distinct organs. The digestive chamber has two openings, a mouth and an anus, and in the Nephrozoa there is an internal body cavity, a coelom or pseudocoelom. These animals have a head end (anterior) and a tail end (posterior), a back (dorsal) surface and a belly (ventral) surface, and a left and a right side. A modern consensus phylogenetic tree for the Bilateria is shown below. Xenacoelomorpha Ambulacraria Chordata Ecdysozoa Spiralia Having a front end means that this part of the body encounters stimuli, such as food, favouring cephalisation, the development of a head with sense organs and a mouth. Many bilaterians have a combination of circular muscles that constrict the body, making it longer, and an opposing set of longitudinal muscles, that shorten the body; these enable soft-bodied animals with a hydrostatic skeleton to move by peristalsis. They also have a gut that extends through the basically cylindrical body from mouth to anus. Many bilaterian phyla have primary larvae which swim with cilia and have an apical organ containing sensory cells. However, over evolutionary time, descendant spaces have evolved which have lost one or more of each of these characteristics. For example, adult echinoderms are radially symmetric (unlike their larvae), while some parasitic worms have extremely simplified body structures. Genetic studies have considerably changed zoologists' understanding of the relationships within the Bilateria. Most appear to belong to two major lineages, the protostomes and the deuterostomes. It is often suggested that the basalmost bilaterians are the Xenacoelomorpha, with all other bilaterians belonging to the subclade Nephrozoa. However, this suggestion has been contested, with other studies finding that xenacoelomorphs are more closely related to Ambulacraria than to other bilaterians. Protostomes and deuterostomes differ in several ways. Early in development, deuterostome embryos undergo radial cleavage during cell division, while many protostomes (the Spiralia) undergo spiral cleavage. Animals from both groups possess a complete digestive tract, but in protostomes the first opening of the embryonic gut develops into the mouth, and the anus forms secondarily. In deuterostomes, the anus forms first while the mouth develops secondarily. Most protostomes have schizocoelous development, where cells simply fill in the interior of the gastrula to form the mesoderm. In deuterostomes, the mesoderm forms by enterocoelic pouching, through invagination of the endoderm. The main deuterostome taxa are the Ambulacraria and the Chordata. Ambulacraria are exclusively marine and include acorn worms, starfish, sea urchins, and sea cucumbers. The chordates are dominated by the vertebrates (animals with backbones), which consist of fishes, amphibians, reptiles, birds, and mammals. The protostomes include the Ecdysozoa, named after their shared trait of ecdysis, growth by moulting, Among the largest ecdysozoan phyla are the arthropods and the nematodes. The rest of the protostomes are in the Spiralia, named for their pattern of developing by spiral cleavage in the early embryo. Major spiralian phyla include the annelids and molluscs. History of classification In the classical era, Aristotle divided animals,[d] based on his own observations, into those with blood (roughly, the vertebrates) and those without. The animals were then arranged on a scale from man (with blood, two legs, rational soul) down through the live-bearing tetrapods (with blood, four legs, sensitive soul) and other groups such as crustaceans (no blood, many legs, sensitive soul) down to spontaneously generating creatures like sponges (no blood, no legs, vegetable soul). Aristotle was uncertain whether sponges were animals, which in his system ought to have sensation, appetite, and locomotion, or plants, which did not: he knew that sponges could sense touch and would contract if about to be pulled off their rocks, but that they were rooted like plants and never moved about. In 1758, Carl Linnaeus created the first hierarchical classification in his Systema Naturae. In his original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then, the last four have all been subsumed into a single phylum, the Chordata, while his Insecta (which included the crustaceans and arachnids) and Vermes have been renamed or broken up. The process was begun in 1793 by Jean-Baptiste de Lamarck, who called the Vermes une espèce de chaos ('a chaotic mess')[e] and split the group into three new phyla: worms, echinoderms, and polyps (which contained corals and jellyfish). By 1809, in his Philosophie Zoologique, Lamarck had created nine phyla apart from vertebrates (where he still had four phyla: mammals, birds, reptiles, and fish) and molluscs, namely cirripedes, annelids, crustaceans, arachnids, insects, worms, radiates, polyps, and infusorians. In his 1817 Le Règne Animal, Georges Cuvier used comparative anatomy to group the animals into four embranchements ('branches' with different body plans, roughly corresponding to phyla), namely vertebrates, molluscs, articulated animals (arthropods and annelids), and zoophytes (radiata) (echinoderms, cnidaria and other forms). This division into four was followed by the embryologist Karl Ernst von Baer in 1828, the zoologist Louis Agassiz in 1857, and the comparative anatomist Richard Owen in 1860. In 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms: Metazoa (multicellular animals, with five phyla: coelenterates, echinoderms, articulates, molluscs, and vertebrates) and Protozoa (single-celled animals), including a sixth animal phylum, sponges. The protozoa were later moved to the former kingdom Protista, leaving only the Metazoa as a synonym of Animalia. In human culture The human population exploits a large number of other animal species for food, both of domesticated livestock species in animal husbandry and, mainly at sea, by hunting wild species. Marine fish of many species are caught commercially for food. A smaller number of species are farmed commercially. Humans and their livestock make up more than 90% of the biomass of all terrestrial vertebrates, and almost as much as all insects combined. Invertebrates including cephalopods, crustaceans, insects—principally bees and silkworms—and bivalve or gastropod molluscs are hunted or farmed for food, fibres. Chickens, cattle, sheep, pigs, and other animals are raised as livestock for meat across the world. Animal fibres such as wool and silk are used to make textiles, while animal sinews have been used as lashings and bindings, and leather is widely used to make shoes and other items. Animals have been hunted and farmed for their fur to make items such as coats and hats. Dyestuffs including carmine (cochineal), shellac, and kermes have been made from the bodies of insects. Working animals including cattle and horses have been used for work and transport from the first days of agriculture. Animals such as the fruit fly Drosophila melanogaster serve a major role in science as experimental models. Animals have been used to create vaccines since their discovery in the 18th century. Some medicines such as the cancer drug trabectedin are based on toxins or other molecules of animal origin. People have used hunting dogs to help chase down and retrieve animals, and birds of prey to catch birds and mammals, while tethered cormorants have been used to catch fish. Poison dart frogs have been used to poison the tips of blowpipe darts. A wide variety of animals are kept as pets, from invertebrates such as tarantulas, octopuses, and praying mantises, reptiles such as snakes and chameleons, and birds including canaries, parakeets, and parrots all finding a place. However, the most kept pet species are mammals, namely dogs, cats, and rabbits. There is a tension between the role of animals as companions to humans, and their existence as individuals with rights of their own. A wide variety of terrestrial and aquatic animals are hunted for sport. The signs of the Western and Chinese zodiacs are based on animals. In China and Japan, the butterfly has been seen as the personification of a person's soul, and in classical representation the butterfly is also the symbol of the soul. Animals have been the subjects of art from the earliest times, both historical, as in ancient Egypt, and prehistoric, as in the cave paintings at Lascaux. Major animal paintings include Albrecht Dürer's 1515 The Rhinoceros, and George Stubbs's c. 1762 horse portrait Whistlejacket. Insects, birds and mammals play roles in literature and film, such as in giant bug movies. Animals including insects and mammals feature in mythology and religion. The scarab beetle was sacred in ancient Egypt, and the cow is sacred in Hinduism. Among other mammals, deer, horses, lions, bats, bears, and wolves are the subjects of myths and worship. See also Notes References External links |
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Contents Light-year A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9460730472580.8 km, which is approximately 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Despite its inclusion of the word "year", the term is not a unit of time. The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. The unit most commonly used in professional astronomy is the parsec (pc), approximately 3.26 light-years. Definitions As defined by the International Astronomical Union (IAU), the light-year is the product of the Julian year[note 1] (365.25 days, as opposed to the 365.2425-day Gregorian year or the 365.24219-day Tropical year that both approximate) and the speed of light (299792458 m/s).[note 2] Both of these values are included in the IAU (1976) System of Astronomical Constants, used since 1984. From this, the following conversions can be derived: The abbreviation used by the IAU for light-year is "ly", International standards like ISO 80000:2006 (now superseded) have used "l.y." and localized abbreviations are frequent, such as "al" in French, Spanish, and Italian (from année-lumière, año luz and anno luce, respectively), "Lj" in German (from Lichtjahr), etc. Before 1984, the tropical year (not the Julian year) and a measured (not defined) speed of light were included in the IAU (1964) System of Astronomical Constants, used from 1968 to 1983. The product of Simon Newcomb's J1900.0 mean tropical year of 31556925.9747 ephemeris seconds and a speed of light of 299792.5 km/s produced a light-year of 9.460530×1015 m (rounded to the seven significant digits in the speed of light) found in several modern sources was probably derived from an old source such as C. W. Allen's 1973 Astrophysical Quantities reference work, which was updated in 2000, including the IAU (1976) value cited above (truncated to 10 significant digits). Other high-precision values are not derived from a coherent IAU system. A value of 9.460536207×1015 m found in some modern sources is the product of a mean Gregorian year (365.2425 days or 31556952 s) and the defined speed of light (299792458 m/s). Another value, 9.460528405×1015 m, is the product of the J1900.0 mean tropical year and the defined speed of light. Abbreviations used for light-years and multiples of light-years are: History The light-year unit appeared a few years after the first successful measurement of the distance to a star other than the Sun, by Friedrich Bessel in 1838. The star was 61 Cygni, and he used a 160-millimetre (6.2 in) heliometre designed by Joseph von Fraunhofer. The largest unit for expressing distances across space at that time was the astronomical unit, equal to the radius of the Earth's orbit at 150 million kilometres (93 million miles). In those terms, trigonometric calculations based on 61 Cygni's parallax of 0.314 arcseconds, showed the distance to the star to be 660000 astronomical units (9.9×1013 km; 6.1×1013 mi). Bessel added that light takes 10.3 years to traverse this distance. He recognized that his readers would enjoy the mental picture of the approximate transit time for light, but he refrained from using the light-year as a unit. He may have resisted expressing distances in light-years because it would reduce the accuracy of his parallax data due to multiplying with the uncertain parameter of the speed of light. The speed of light was not yet precisely known in 1838; the estimate of its value changed in 1849 (Fizeau) and 1862 (Foucault). It was not yet considered to be a fundamental constant of nature, and the propagation of light through the aether or space was still enigmatic. The light-year unit appeared in 1851 in a German popular astronomical article by Otto Ule. Ule explained the oddity of a distance unit name ending in "year" by comparing it to a walking hour (Wegstunde). A contemporary German popular astronomical book also noticed that light-year is an odd name. In 1868 an English journal labelled the light-year as a unit used by the Germans. Eddington called the light-year an inconvenient and irrelevant unit, which had sometimes crept from popular use into technical investigations. Although modern astronomers often prefer to use the parsec, light-years are also popularly used to gauge the expanses of interstellar and intergalactic space. Usage of term Distances expressed in light-years include those between stars in the same general area, such as those belonging to the same spiral arm or globular cluster. Galaxies themselves span from a few thousand to a few hundred thousand light-years in diameter, and are separated from neighbouring galaxies and galaxy clusters by millions of light-years. Distances to objects such as quasars and the Sloan Great Wall run into the billions of light-years. Related units Distances between objects within a star system tend to be small fractions of a light-year, and are usually expressed in astronomical units. However, smaller units of length can similarly be formed usefully by multiplying units of time by the speed of light. For example, the light-second, useful in astronomy, telecommunications and relativistic physics, is exactly 299792458 metres or 1/31557600 of a light-year. Units such as the light-minute, light-hour and light-day are sometimes used in popular science publications. The light-month, roughly one-twelfth of a light-year, is also used occasionally for approximate measures. The Hayden Planetarium specifies the light month more precisely as 30 days of light travel time. Light travels approximately one foot in a nanosecond; the term "light-foot" is sometimes used as an informal measure of time. See also Notes References External links |
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Contents Thirty-seventh government of Israel The thirty-seventh government of Israel is the current cabinet of Israel, formed on 29 December 2022, following the Knesset election the previous month. The coalition government currently consists of five parties — Likud, Shas, Otzma Yehudit, Religious Zionist Party and New Hope — and is led by Benjamin Netanyahu, who took office as the prime minister of Israel for the sixth time. The government is widely regarded as the most right-wing government in the country's history, and includes far-right politicians. Several of the government's policy proposals have led to controversies, both within Israel and abroad, with the government's attempts at reforming the judiciary leading to a wave of demonstrations across the country. Following the outbreak of the Gaza war, opposition leader Yair Lapid initiated discussions with Netanyahu on the formation of an emergency government. On 11 October 2023, National Unity MKs Benny Gantz, Gadi Eisenkot, Gideon Sa'ar, Hili Tropper, and Yifat Shasha-Biton joined the Security Cabinet of Israel to form an emergency national unity government. Their accession to the Security Cabinet and to the government (as ministers without portfolio) was approved by the Knesset the following day. Gantz, Netanyahu, and Defense Minister Yoav Gallant became part of the newly formed Israeli war cabinet, with Eisenkot and Ron Dermer serving as observers. National Unity left the government in June 2024. New Hope rejoined the government in September. Otzma Yehudit announced on 19 January 2025 that it had withdrawn from the government, which took effect on 21 January, following the cabinet's acceptance of the three-phase Gaza war ceasefire proposal, though it rejoined two months later. United Torah Judaism left the government in July 2025 over dissatisfaction with the government's draft conscription law. Shas left the government several days later, though it remains part of the coalition. Background The right-wing bloc of parties, led by Benjamin Netanyahu, known in Israel as the national camp, won 64 of the 120 seats in the elections for the Knesset, while the coalition led by the incumbent prime minister Yair Lapid won 51 seats. The new majority has been variously described as the most right-wing government in Israeli history, as well as Israel's most religious government. Shortly after the elections, Lapid conceded to Netanyahu, and congratulated him, wishing him luck "for the sake of the Israeli people". On 15 November, the swearing-in ceremony for the newly elected members of the 25th Knesset was held during the opening session. The vote to appoint a new Speaker of the Knesset, which is usually conducted at the opening session, as well as the swearing in of cabinet members were postponed since ongoing coalition negotiations had not yet resulted in agreement on these positions. Government formation Yair Lapid Yesh Atid Benjamin Netanyahu Likud On 3 November 2022, Netanyahu told his aide Yariv Levin to begin informal coalition talks with allied parties, after 97% of the vote was counted. The leader of the Shas party Aryeh Deri met with Yitzhak Goldknopf, the leader of United Torah Judaism and its Agudat Yisrael faction, on 4 November. The two parties agreed to cooperate as members of the next government. The Degel HaTorah faction of United Torah Judaism stated on 5 November that it will maintain its ideological stance about not seeking any ministerial posts, as per the instruction of its spiritual leader Rabbi Gershon Edelstein, but will seek other senior posts like Knesset committee chairmen and deputy ministers. Netanyahu himself started holding talks on 6 November. He first met with Moshe Gafni, the leader of Degel HaTorah, and then with Goldknopf. Meanwhile, the Religious Zionist Party leader Bezalel Smotrich and the leader of its Otzma Yehudit faction Itamar Ben-Gvir pledged that they would not enter the coalition without the other faction. Gafni later met with Smotrich for coalition talks. Smotrich then met with Netanyahu. On 7 November, Netanyahu met with Ben-Gvir who demanded the Ministry of Public Security with expanded powers for himself and the Ministry of Education or Transport and Road Safety for Yitzhak Wasserlauf. A major demand among all of Netanyahu's allies was that the Knesset be allowed to ignore the rulings of the Supreme Court. Netanyahu met with the Noam faction leader and its sole MK Avi Maoz on 8 November after he threatened to boycott the coalition. He demanded complete control of the Western Wall by the Haredi rabbinate and removal of what he considered as anti-Zionist and anti-Jewish content in schoolbooks. President Isaac Herzog began consultations with heads of all the political parties on 9 November after the election results were certified. During the consultations, he expressed his reservations about Ben-Gvir becoming a member in the next government. Shas met with Likud for coalition talks on 10 November. By 11 November, Netanyahu had secured recommendations from 64 MKs, which constituted a majority. He was given the mandate to form the thirty-seventh government of Israel by President Herzog on 13 November. Otzma Yehudit and Noam officially split from Religious Zionism on 20 November as per a pre-election agreement. On 25 November, Otzma Yehudit and Likud signed a coalition agreement, under which Ben-Gvir will assume the newly created position of National Security Minister, whose powers would be more expansive than that of the Minister of Public Security, including overseeing the Israel Police and the Israel Border Police in the West Bank, as well as giving powers to authorities to shoot thieves stealing from military bases. Yitzhak Wasserlauf was given the Ministry for the Development of the Negev and the Galilee with expanded powers to regulate new West Bank settlements, while separating it from the "Periphery" portfolio, which will be given to Shas. The deal also includes giving the Ministry of Heritage to Amihai Eliyahu, separating it from the "Jerusalem Affairs" portfolio, the chairmanship of the Knesset's Public Security Committee to Zvika Fogel and that of the Special Committee for the Israeli Citizens' Fund to Limor Son Har-Melech, the post of Deputy Economic Minister to Almog Cohen, establishment of a national guard, and expansion of mobilization of reservists in the Border Police. Netanyahu and Maoz signed a coalition agreement on 27 November, under which the latter would become a deputy minister, would head an agency on Jewish identity in the Prime Minister's Office, and would also head Nativ, which processes the aliyah from the former Soviet Union. The agency for Jewish identity would have authority over educational content taught outside the regular curriculum in schools, in addition to the department of the Ministry of Education overseeing external teaching and partnerships, which would bring nonofficial organisations permitted to teach and lecture at schools under its purview. Likud signed a coalition agreement with the Religious Zionist Party on 1 December. Under the deal, Smotrich would serve as the Minister of Finance in rotation with Aryeh Deri, and the party will receive the post of a minister within the Ministry of Defense with control over the departments administering settlement and open lands under the Coordinator of Government Activities in the Territories, in addition to another post of a deputy minister. The deal also includes giving the post of Minister of Aliyah and Integration to Ofir Sofer, the newly created National Missions Ministry to Orit Strook, and the chairmanship of the Knesset's Constitution, Law and Justice Committee to Simcha Rothman. Likud and United Torah Judaism signed a coalition agreement on 6 December, to allow request for an extension to the deadline. Under it, the party would receive the Ministry of Construction and Housing, the chairmanship of the Knesset Finance Committee which will be given to Moshe Gafni, the Ministry of Jerusalem and Tradition (which would replace the Ministry of Jerusalem Affairs and Heritage), in addition to several posts of deputy ministers and chairmanships of Knesset committees. Likud also signed a deal with Shas by 8 December, securing interim coalition agreements with all of their allies. Under the deal, Deri will first serve as the Minister of Interior and Health, before rotating posts with Smotrich after two years. The party will also receive the Ministry of Religious Services and Welfare Ministries, as well as posts of deputy ministers in the Ministry of Education and Interior. The vote to replace then-incumbent Knesset speaker Mickey Levy was scheduled for 13 December, after Likud and its allies secured the necessary number of signatures for it. Yariv Levin of Likud was elected as an interim speaker by 64 votes, while his opponents Merav Ben-Ari of Yesh Atid and Ayman Odeh of Hadash received 45 and five votes respectively. Netanyahu asked Herzog for a 14-day extension after the agreement with Shas to finalise the roles his allied parties would play. Herzog on 9 December extended the deadline to 21 December. On that date, Netanyahu informed Herzog that he had succeeded in forming a coalition, with the new government expected to be sworn in by 2 January 2023. The government was sworn in on 29 December 2022. Timeline Israeli law stated that people convicted of crimes cannot serve in the government. An amendment to that law was made in late 2022, known colloquially as the Deri Law, to allow those who had been convicted without prison time to serve. This allowed Deri to be appointed to the cabinet. Shas leader Aryeh Deri was appointed to be Minister of Health, Minister of the Interior, and Vice Prime Minister in December 2022. He was fired in January 2023, following a Supreme Court decision that his appointment was unreasonable, since he had been convicted of fraud, and had promised not to seek government roles through a plea deal. In March 2023, Defence Minister Yoav Gallant called on the government to delay legislation related to the judicial reform. Prime Minister Netanyahu announced that he had been dismissed from his position, leading to the continuation of mass protests across the country (which had started in January in Tel Aviv). Gallant continued to serve as a minister as he had not received formal notice of dismissal, and two weeks later it was announced that Netanyahu had reversed his decision. Public Safety Minister Itamar Ben-Gvir (Otzma Yehudit leader) and Minister of Justice Yariv Levin (Likud) both threatened to resign if the judicial reform was delayed.[better source needed] After the outbreak of the Gaza war, five members of the National Unity party joined the government as ministers without portfolio, with leader Benny Gantz being made a member of the new Israeli war cabinet (along with Netanyahu and Gallant). As the war progressed, minister of national security Itamar Ben-Gvir threatened to leave the government if the war was ended. A month later in mid December, he again threatened to leave if the war did not maintain "full strength". Gideon Sa'ar stated on 16 March that his New Hope party would resign from the government and join the opposition if Prime Minister Benjamin Netanyahu did not appoint him to the Israeli war cabinet. Netanyahu did not do so, resulting in Sa'ar's New Hope party leaving the government nine days later, reducing the size of the coalition from 76 MKs to 72. Ben-Gvir and Bezalel Smotrich, of the National Religious Party–Religious Zionism party, have indicated that they will withdraw their parties from the government if the January 2025 Gaza war ceasefire is adopted, which would bring down the government. Ben-Gvir announced on 5 June that the members of his party would be allowed to vote as they wish, though his party resumed support on 9 June. On 18 May, Gantz set an 8 June deadline for withdrawal from the coalition, which was delayed by a day following the 2024 Nuseirat rescue operation. Gantz and his party left the government on 9 June, giving the government 64 seats in the Knesset. Sa'ar and his New Hope party rejoined the Netanyahu government on 30 September, increasing the number of seats held by the government to 68. The High Court of Justice ruled on 28 March 2024 that yeshiva funds would no longer be available for students who are "eligible for enlistment", effectively allowing ultra-Orthodox Jews to be drafted into the IDF. Attorney general Gali Baharav-Miara indicated on 31 March that the conscription process must begin on 1 April. The court ruled on 25 June that the IDF must begin to draft yeshiva students. Likud announced on 7 July that it would not put forward any legislation after Shas and United Torah Judaism said that they would boycott the plenary session over the lack of legislation dealing with the Haredi draft. The Ultra-Orthodox boycott continued for a second day, with UTJ briefly ending its boycott on 9 July to unsuccessfully vote in favor of a bill which would have weakened the Law of Return. Yuli Edelstein, who was replaced by Boaz Bismuth on the Foreign Affairs and Defense Committee in early August, published a draft version of the conscription law shortly before his ouster. Bismuth cancelled the work on the draft law in September 2025, which Edelstein called "a shame." Bismuth released the official version of the draft law in late November 2025. It weakened penalties for draft evaders, with Edelstein saying it was "the exact opposite" of the bill which he attempted to pass. Members of Otzma Yehudit resigned from the government on 19 January 2025 over the January 2025 Gaza war ceasefire, which took effect on 21 January. The members rejoined in March, following the "resumption" of the war in Gaza. Avi Maoz of the Noam party left the government in March 2025. On 4 June 2025, senior rabbis for United Torah Judaism Dov Lando and Moshe Hillel Hirsch instructed the party's MKs to pass a bill which would dissolve the Knesset. Yesh Atid, Yisrael Beytenu and The Democrats announced that they will "submit a bill" for dissolution on 11 June, with Yesh Atid tabling the bill on 4 June. There were also reports that Shas would vote in favor of Knesset dissolution amidst division within the governing coalition on Haredi conscription. This jeopardized the coalition's majority and would have triggered new elections if the bill passed. The following day, Agudat Yisrael, one of the United Torah Judaism factions, confirmed that it would submit a bill to dissolve the Knesset. Asher Medina, a Shas spokesman, indicated on 9 June that the party would vote in favor of a preliminary bill to dissolve the Knesset. The rabbis of Degel HaTorah instructed the parties' MKs on 12 June 2025 to oppose the dissolution of the Knesset, which was followed by Yuli Edelstein and the Shas and Degel HaTorah parties announcing that a deal had been reached, with "rabbinical leaders" telling their parties to delay the dissolution vote by a week. Shas and Degel HaTorah voted against the dissolution bill, which led to the bill failing its preliminary reading in a vote of 61 against and 53 in favor. MKs Ya'akov Tessler and Moshe Roth of Agudat Yisrael voted in favor of dissolution. Another dissolution bill will be unable to be brought forward for six months. If the bill had passed its preliminary reading, in addition to three more readings, an election would have been held in approximately three months; The Jerusalem Post posited it would have been held in October. Degel HaTorah announced on 14 July 2025 that it would leave the government because members of the party were dissatisfied after viewing the proposed draft bill by Yuli Edelstein regarding Haredi exemptions from the Israeli draft. Several hours later, Agudat Yisrael announced that it would also leave the government. Deputy Transportation Minister Uri Maklev, Moshe Gafni, the head of the Knesset Finance Committee, Ya'akov Asher, the head of the Knesset Interior and Environment Protection Committee and Jerusalem Affairs minister Meir Porush all submitted their resignations, with their resignations taking effect in 48 hours. Sports Minister Ya'akov Tessler and "Special Committee for Public Petitions Chair" Yitzhak Pindrus also submitted resignations. Yisrael Eichler submitted his resignation as the "head of the Knesset Labor and Welfare Committee" the same day. The resignations will leave Netanyahu's government with a 60-seat majority in the Knesset, as Avi Maoz, of the Noam party, left the government in March 2025. Despite Edelstein's ouster in August, a spokesman for UTJ head Yitzhak Goldknopf remarked that it would not change the faction's withdrawal from the government. The religious council for Shas, called the Moetzet Chachmei HaTorah, instructed the party on 16 July to leave the government, but stay in the coalition. The following day, various cabinet ministers submitted their resignations, including "Interior Minister Moshe Arbel, Social Affairs Minister Ya'akov Margi and Religious Services Minister Michael Malchieli." Malchieli reportedly has postponed his resignation so he could attend a 20 July meeting of the panel investigating whether attorney general Gali Baharav-Miara should be dismissed. Deputy Minister of Agriculture Moshe Abutbul, Minister of Health Uriel Buso and Haim Biton, a minister in the Education Ministry, also submitted their resignation letters, while Arbel retracted his resignation letter. The last cabinet member from the party to submit it was Labor Minister Yoav Ben-Tzur. The ministers who resigned will return to the Knesset, replacing MKs Moshe Roth, Yitzhak Pindrus and Eliyahu Baruchi. Members of government Listed below are the current ministers in the government: Principles and priorities According to the agreements signed between Likud and each of its coalition partners, and the incoming government's published guideline principles, its stated priorities are to combat the cost of living, further centralize Orthodox control over the state religious services, pass judicial reforms which include legislation to reduce judicial controls on executive and legislative power, expand settlements in the West Bank, and consider an annexation of the West Bank. Before the vote of confidence in his new government in the Knesset, Netanyahu presented three top priorities for the new government: internal security and governance, halting the nuclear program of Iran, and the development of infrastructure, with a focus on further connecting the center of the country with its periphery. Policies The government's flagship program, centered around reforms in the judicial branch, drew widespread criticism. Critics said it would have negative effects on the separation of powers, the office of the Attorney General, the economy, public health, women and minorities, workers' rights, scientific research, the overall strength of Israel's democracy and its foreign relations. After weeks of public protests on Israel's streets, joined by a growing number of military reservists, Minister of Defense Yoav Gallant spoke against the reform on 25 March, calling for a halt of the legislative process "for the sake of Israel's security". The next day, Netanyahu announced that he would be removed from his post, sparking another wave of protest across Israel and ultimately leading to Netanyahu agreeing to pause the legislation. On 10 April, Netanyahu announced that Gallant would keep his post. On 27 March 2023, after the public protests and general strikes, Netanyahu announced a pause in the reform process to allow for dialogue with opposition parties. However, negotiations aimed at reaching a compromise collapsed in June, and the government resumed its plans to unilaterally pass parts of the legislation. On 24 July 2023, the Knesset passed a bill that curbs the power of the Supreme Court to declare government decisions unreasonable; on 1 January 2024, the Supreme Court struck the bill down. The Knesset passed a "watered-down" version of the judicial reform package in late March 2025 which "changes the composition" of the judicial selection committee. In December 2022 Minister of National Security Itamar Ben-Gvir sought to amend the law that regulates the operations of the Israel Police, such that the ministry will have more direct control of its forces and policies, including its investigative priorities. Attorney General Gali Baharav-Miara objected to the draft proposal, raising concerns that the law would enable the politicization of police work, and the draft was amended to partially address those concerns. Nevertheless, in March 2023 Deputy Attorney General Gil Limon stated that the Attorney General's fears had been realized, referring to several instances of ministerial involvement in the day-to-day work of the otherwise independent police force – statements that were repeated by the Attorney General herself two days later. Separately, Police Commissioner Kobi Shabtai instructed Deputy Commissioners to avoid direct communication with the minister, later stating that "the Israel Police will remain apolitical, and act only according to law". Following appeals by the Association for Civil Rights in Israel and the Movement for Quality Government in Israel, the High Court of Justice instructed Ben-Gvir "to refrain from giving operational directions to the police... [especially] as regards to protests and demonstrations against the government." As talks of halting the judicial reform gained wind during March 2023, Minister of National Security Itamar Ben-Gvir threatened to resign if the legislation implementing the changes was suspended. To appease Ben-Gvir, Prime Minister Netanyahu announced that the government would promote the creation of a new National Guard, to be headed by Ben-Gvir. On 29 March, thousands of Israelis demonstrated in Tel Aviv, Haifa and Jerusalem against this decision. On 1 April, the New York Times quoted Gadeer Nicola, head of the Arab department at the Association for Civil Rights in Israel, as saying "If this thing passes, it will be an imminent danger to the rights of Arab citizens in this country. This will create two separate systems of applying the law. The regular police which will operate against Jewish citizens — and a militarized militia to deal only with Arab citizens." The same day, while speaking on Israel's Channel 13 about those whom he'd like to see enlist in the National Guard, Ben-Gvir specifically mentioned La Familia, the far-right fan club of the Beitar Jerusalem soccer team. On 2 April, Israel's cabinet approved the establishment of a law enforcement body that would operate independently of the police, under Ben-Gvir's authority. According to the decision, the Minister was to establish a committee chaired by the Director General of the Ministry of National Security, with representatives of the ministries of defense, justice and finance, as well as the police and the IDF, to outline the operations of the new organization. The committee's recommendations will be submitted to the government for consideration. Addressing a conference on 4 April, Police Commissioner Kobi Shabtai said that he is not opposed to the establishment of a security body which would answer to the police, but "a separate body? Absolutely not." The police chief said he had warned Ben-Gvir that the establishment of a security body separate from the police is "unnecessary, with extremely high costs that may harm citizens' personal security." During a press conference on 10 April, Prime Minister Netanyahu said, in what has been seen by some news outlets as a concession to the protesters, that "This will not be anyone's militia, it will be a security body, orderly, professional, that will be subordinate to one of the [existing] security bodies." The committee established by the government recommended the government to order the establishment of the National Guard immediately while allocating budgets. The National Guard, under whose command will be a superintendent of the police, will not be subordinate to Ben-Gvir. It will be subordinate to the police commissioner and will be part of Israel Border Police. The Ministry of Defense and Finance opposed the conclusions. The Israeli National Security Council called for further discussion on this. The coalition's efforts to expand the purview of Rabbinical courts; force some organizations, such as hospitals, to enforce certain religious practices; amend the Law Prohibiting Discrimination to allow gender segregation and discrimination on the grounds of religious belief; expand funding for religious causes; and put into law the exemption of yeshiva and kolel students from conscription have drawn criticism. According to the Haaretz op-ed of 7 March 2023, "the current coalition is interested... in modifying the public space so it suits the religious lifestyle. The legal coup is meant to castrate anyone who can prevent it, most of all the HCJ." Several banks and institutional investors, including the Israel Discount Bank and AIG have committed to avoid investing in, or providing credit to any organization that will discriminate against others on ground of religion, race, gender or sexual orientation. A series of technology companies and investment firms including Wiz, Intel Israel, Salesforce and Microsoft Israel Research and Development, have criticized the proposed changes to the Law Prohibiting Discrimination, with Wiz stating that it will require its suppliers to commit to preventing discrimination. Over sixty prominent law firms pledged that they will neither represent, nor do business with discriminating individuals and organizations. Insight Partners, a major private equity fund operating in Israel, released a statement warning against intolerance and any attempt to harm personal liberties. Orit Lahav, chief executive of the women's rights organization Mavoi Satum ("Dead End"), said that "the Rabbinical courts are the most discriminatory institution in the State of Israel... Limiting the HCJ[d] while expanding the jurisdiction of the Rabbinical courts would... cause significant harm to women." Anat Thon Ashkenazy, Director of the Center for Democratic Values and Institutions at the Israel Democracy Institute, said that "almost every part of the reform could harm women... the meaning of an override clause is that even if the court says that the law on gender segregation is illegitimate, is harmful, the Knesset could say 'Okay, we say otherwise'". She added that "there is a very broad institutional framework here, after which there will come legislation that harms women's right and we will have no way of protecting or stopping it." During July 2023, 20 professional medical associations signed a letter of position warning against the ramifications to public health that would result from the exclusion of women from the public sphere. They cited, among others, a rise in prevalence of risk factors for cardiovascular disease, pregnancy-related ailments, psychological distress, and the risk of suicide. On 30 July the Knesset passed an amendment to penal law adding sexual offenses to those offenses whose penalty can be doubled if done on grounds of "nationalistic terrorism, racism or hostility towards a certain community". According to MK Limor Son Har-Melech, the bill is meant to penalize any individual who "[intends to] harm a woman sexually based on her Jewishness". The law was criticized by MK Gilad Kariv as "populist, nationalistic, and dangerous towards the Arab citizens of Israel", and by MK Ahmad Tibi as a "race law", and was objected to by legal advisors at the Ministry of Justice and the Knesset Committee on National Security. Activist Orit Kamir wrote that "the amendment... is neither feminist, equal, nor progressive, but the opposite: it subordinates women's sexuality to the nationalistic, racist patriarchy. It hijacks the Law for Prevention of Sexual Harassment to serve a world view that tags women as sexual objects that personify the nation's honor." Yael Sherer, director of the Lobby to Combat Sexual Violence, criticized the law as being informed by dated ideas about sexual assault, and proposed that MKs "dedicate a session... to give victims of sexual assault an opportunity to come out of the darkness... instead of [submitting] declarative bills that change nothing and are not meant but for grabbing headlines". In Israel, during 2022, 24 women "were murdered because they were women," which was an increase of 50% compared to 2021. A law permitting courts to order men subject to a restraining order following domestic violence offenses to wear electronic tags was drafted during the previous Knesset and had passed its first reading unanimously. On 22 March 2023, the Knesset voted to reject the bill. It had been urged to do so by National Security Minister Itamar Ben-Gvir, who said that the bill was unfair to men. Earlier in the week, Ben-Gvir had blocked the measure from advancing in the ministerial legislative committee. The MKs voting against the bill included Prime Minister Netanyahu. The Association of Families of Murder Victims said that by rejecting the law, National Security Minister Itamar Ben-Gvir "brings joy to violent men and abandons the women threatened with murder… unsupervised restraining orders endanger women's lives even more. They give women the illusion of being protected, and then they are murdered." MK Pnina Tamano-Shata, chairwoman of the Knesset Committee on the Status of Women and Gender Equality, said that "the coalition proved today that it despises women's lives." The NGO Amutat Bat Melech [he], which assists Orthodox and ultra-Orthodox women who suffer from domestic violence, said that: "Rejecting the electronic bracelet bill is disconnected from the terrible reality of seven femicides since the beginning of the year. This is an effective tool of the first degree that could have saved lives and reduced the threat to women suffering from domestic violence. This is a matter of life and death, whose whole purpose is to provide a solution to defend women." The agreement signed by the coalition parties includes the setting up of a committee to draft changes to the Law of Return. Israeli religious parties have long demanded that the "grandchild clause" of the Law of Return be cancelled. This clause grants citizenship to anyone with at least one Jewish grandparent, as long as they do not practice another religion. If the grandchild clause were to be removed from the Law of Return then around 3 million people who are currently eligible for aliyah would no longer be eligible. The heads of the Jewish Agency, the Jewish Federations of North America, the World Zionist Organization and Keren Hayesod sent a joint letter to Prime Minister Netanyahu, expressing their "deep concern" about any changes to the Law of Return, adding that "Any change in the delicate and sensitive status quo on issues such as the Law of Return or conversion could threaten to unravel the ties between us and keep us away from each other." The Executive Council of Australian Jewry and the Zionist Federation of Australia issued a joint statement saying "We… view with deep concern… proposals in relation to religious pluralism and the law of return that risk damaging Israel's… relationship with Diaspora Jewry." On 19 March 2023, Israeli Finance Minister Bezalel Smotrich spoke in Paris at a memorial service for a Likud activist. The lectern at which Smotrich spoke was covered with a flag depicting the 'Greater Land of Israel,' encompassing the whole of Mandatory Palestine, as well as Trans-Jordan. During his speech, Smotrich said that "there's no such thing as Palestinians because there's no such thing as a Palestinian people." He added that the Palestinian people are a fictitious nation invented only to fight the Zionist movement, asking "Is there a Palestinian history or culture? There isn't any." The event received widespread media coverage. On 21 March, a spokesman for the US State Department sharply criticized Smotrich's comments. "The comments, which were delivered at a podium adorned with an inaccurate and provocative map, are offensive, they are deeply concerning, and, candidly, they're dangerous. The Palestinians have a rich history and culture, and the United States greatly values our partnership with the Palestinian people," he said. The Jordanian Foreign Ministry also voiced disapproval: "The Israeli Minister of Finance's use, during his participation in an event held yesterday in Paris, of a map of Israel that includes the borders of the Hashemite Kingdom of Jordan and the occupied Palestinian territories represents a reckless inflammatory act, and a violation of international norms and the Jordanian-Israeli peace treaty." Additionally, a map encompassing Mandatory Palestine and Trans-Jordan with a Jordanian flag on it was placed on a central lectern in the Jordanian Parliament. Jordan's parliament voted to expel the Israeli ambassador. Israel's Ministry of Foreign Affairs released a clarification relating to the matter, stating that "Israel is committed to the 1994 peace agreement with Jordan. There has been no change in the position of the State of Israel, which recognizes the territorial integrity of the Hashemite Kingdom of Jordan". Ahead of a Europe Day event due to take place on 9 May 2023, far-right wing National Security Minister Itamar Ben-Gvir was assigned as a representative of the government and a speaker at the event by the government secretariat, which deals with placing ministers at receptions on the occasion of the national days of the foreign embassies. The European Union requested that Ben-Gvir not attend, but the government did not make changes to the plan. On 8 May, the European delegation to Israel cancelled the reception, stating that: "The EU Delegation to Israel is looking forward to celebrating Europe Day on May 9, as it does every year. Regrettably, this year we have decided to cancel the diplomatic reception, as we do not want to offer a platform to someone whose views contradict the values the European Union stands for. However, the Europe Day cultural event for the Israeli public will be maintained to celebrate with our friends and partners in Israel the strong and constructive bilateral relationship". Israel's Opposition Leader Yair Lapid stated: "Sending Itamar Ben-Gvir to a gathering of EU ambassadors is a serious professional mistake. The government is embarrassing a large group of friendly countries, jeopardizing future votes in international institutions, and damaging our foreign relations. Last year, after a decade of efforts, we succeeded in signing an economic-political agreement with the European Union that will contribute to the Israeli economy and our foreign relations. Why risk it, and for what? Ben-Gvir is not a legitimate person in the international community (and not really in Israel either), and sometimes you have to be both wise and just and simply send someone else". On 23 February 2023, Defense Minister Gallant signed an agreement assigning governmental powers in the West Bank to a body to be headed by Minister Bezalel Smotrich, who will effectively become the governor of the West Bank, controlling almost all areas of life in the area, including planning, building and infrastructure. Israeli governments have hitherto been careful to keep the occupation as a military government. The temporary holding of power by an occupying military force, pending a negotiated settlement, is a principle of international law – an expression of the prohibition against obtaining sovereignty through conquest that was introduced in the wake of World War II. An editorial in Haaretz noted that the assignment of governmental powers in the West Bank to a civilian governor, alongside the plan to expand the dual justice system so that Israeli law will apply fully to settlers in the West Bank, constitutes de jure annexation of the West Bank. On 26 February 2023, following the 2023 Huwara shooting in which two Israelis were killed by an unidentified attacker, hundreds of Israeli settlers attacked the Palestinian town of Huwara and three nearby villages, setting alight hundreds of Palestinian homes (some with people in them), businesses, a school, and numerous vehicles, killing one Palestinian man and injuring 100 others. Bezalel Smotrich subsequently called on Twitter for Huwara to be "wiped out" by the Israeli government. Zvika Fogel MK, of the ultra-nationalist Otzma Yehudit, which forms part of the governing coalition, said that he "looks very favorably upon" the results of the rampage. Members of the coalition proposed an amendment to the Disengagement Law, which would allow Israelis to resettle settlements vacated during the 2005 Israeli disengagement from Gaza and the northern West Bank. The evacuated settlements were considered illegal under international law, according to most countries. The proposal was approved for voting by the Foreign Affairs and Defense Committee on 9 March 2023, while the committee was still waiting for briefing materials from the NSS, IDF, MFA and Shin Bet, and was passed on 21 March. The US has requested clarification from Israeli ambassador Michael Herzog. A US State Department spokesman stated that "The U.S. strongly urges Israel to refrain from allowing the return of settlers to the area covered by the legislation, consistent with both former Prime Minister Sharon and the current Israeli Government's commitment to the United States," noting that the actions represent a clear violation of undertakings given by the Sharon government to the Bush administration in 2005 and Netanyahu's far-right coalition to the Biden administration the previous week. Minister of Communication Shlomo Karhi had initially intended to cut the funding of the Israeli Public Broadcasting Corporation (also known by its blanket branding Kan) by 400 million shekels – roughly half of its total budget – closing several departments, and privatizing content creation. In response, the Director-General of the European Broadcasting Union, Noel Curran, sent two urgent letters to Netanyahu, expressing his concerns and calling on the Israeli government to "safeguard the independence of our Member KAN and ensure it is allowed to operate in a sustainable way, with funding that is both stable, adequate, fair, and transparent." On 25 January 2023, nine journalist organizations representing some of Kan's competitors issued a statement of concern, acknowledging the "important contribution of public broadcasting in creating a worthy, unbiased and non-prejudicial journalistic platform", and noting that "the existence of the [broadcasting] corporation as a substantial public broadcast organization strengthens media as a whole, adding to the competition in the market rather than weakening it." They also expressed their concern that the "real reason" for the proposal was actually "an attempt to silence voices from which... [the Minister] doesn't always draw satisfaction". The same day, hundreds of journalists, actors and filmmakers protested in Tel Aviv. The proposal was eventually put on hold. On 22 February 2023 it was reported that Prime Minister Netanyahu was attempting to appoint his close associate Yossi Shelley as the deputy to the National Statistician — a highly sensitive position in charge of providing accurate data for decision makers. The appointment of Shelley, who did not possess the required qualifications for the role, was withdrawn following publication. In its daily editorial, Haaretz tied this attempt with the judicial reform: "once they take control of the judiciary, law enforcement and public media, they wish to control the state's data base, the dry numerical data it uses to plan its future". Netanyahu also proposed Avi Simhon for the role, and eventually froze all appointments at the Israel Central Bureau of Statistics. Also on 22 February 2023, it was revealed that Yoav Kish, the Minister of Education, was promoting a draft government decision change to the National Library of Israel board of directors which would grant him more power over the institution. In response, the Hebrew University — which owned the library until 2008 – announced that if the draft is accepted, it will withdraw its collections from the library. The university's collections, which according to the university constitute some 80% of the library's collection, include the Agnon archive, the original manuscript of Hatikvah, and the Rothschild Haggadah, the oldest known Haggadah. A group of 300 authors and poets signed an open letter against the move, further noting their objection against "political takeover" of public broadcasting, as well as "any legislation that will castrate the judiciary and damage the democratic foundations of the state of Israel". Several days later, it was reported that a series of donors decided to withhold their donations to the library, totaling some 80 million shekels. On 3 March a petition against the move by 1,500 academics, including Israel Prize laureates, was sent to Kish. The proposal has been seen by some as retribution against Shai Nitzan, the former State Attorney and the library's current rector. On 5 March it was reported that the Legal Advisor to the Ministry of Finance, Asi Messing, was withholding the proposal. According to Messing, the proposal – which was being promoted as part of the Economic Arrangements Law – "was not reviewed... by the qualified personnel in the Ministry of Finance, does not align with any of the common goals of the economic plan, was not agreed to by myself and was not approved by the Attorney General." As of February 2023, the government has been debating several proposals that will significantly weaken the Ministry of Environmental Protection, including reducing the environmental regulation of planning and development and electricity production. One of the main proposals, the transferal of a 3 billion shekel fund meant to finance waste management plants from the Ministry of Environmental Protection to the Ministry of the Interior, was eventually withdrawn. The Minister of Environmental Protection, Idit Silman, has been criticized for using for meeting with climate change denialists, for wasteful and personally-motivated travel on the ministry's expense, for politicizing the role, and for engaging in political activity on the ministry's time. The government has been noted for an unusually high number of dismissals and resignations of senior career civil servants, and for the frequent attempts to replace them with candidates with known political associations, who are often less competent. According to sources, Netanyahu and people in his vicinity are seeking out civil servants who were appointed by the previous government, intent on replacing them with people loyal to him. Governmental nominees for various positions have been criticized for lack of expertise. In addition to the nominee to the position of Deputy National Statistician (see above), the Director General of the Ministry of Finance, Shlomi Heisler; the Director General of the Ministry of Justice, Itamar Donenfeld; and the Director General of Ministry of Transport, Moshe Ben Zaken, have all been criticized for incompetence, lack of familiarity with their Ministries' subject matter, lack of interest in the job, or lack of experience in managing large organizations. It has been reported that in some ministries, senior officials were enacting slowdowns as a means for dealing with the new ministers and director generals. On 28 July the director general of the Ministry of Education resigned, citing as reason the societal "rift". Asaf Zalel, a retired Air Force Brigadier General, was appointed in January. When asked about attempts to appoint his personal friend and attorney to the board of directors of a state-owned company, Minister David Amsalem replied: "that is my job, due to my authority to appoint directors. I put forward people that I know and hold in esteem". Under Minister of Transport Miri Regev, the ministry has either dismissed or lost the heads of the National Public Transport Authority, Israel Airports Authority, National Road Safety Authority, Israel Railways, and several officials in Netivei Israel. The current chair of Netivei Israel is Likud member and Regev associate Yigal Amadi, and the legal counsel is Einav Abuhzira, daughter of a former Likud branch chair. Abuhzira was appointed instead of Elad Berdugo, nephew of Netanyahu surrogate Yaakov Bardugo, after he was disqualified for the role by the Israel Government Companies Authority. In July 2023 the Ministry of Communications, Shlomo Karhi, and the minister in charge of the Israel Government Companies Authority, Dudi Amsalem, deposed the chair of the Israel Postal Company, Michael Vaknin. The chair, who was hired to lead the company's financial recovery after years of operational loss and towards privatization, has gained the support of officials at the Authority and at the Ministry of Finance; nevertheless, the ministers claimed that his performance is inadequate, and nominated in his place Yiftah Ron-Tal, who has known ties to Netanyahu and Smotrich. They also nominated four new directors, two of which have known political associations, and a third who was a witness in Netanyahu's trial. The coalition is allowed to spend a portion of the state's budget on a discretionary basis, meant to coax member parties to reach an agreement on the budget. As of May 2023, the government was pushing an allocation of over 13 billion shekels over two years - almost seven times the amount allocated by the previous government. Most of the funds will be allocated for uses associated with the religious, orthodox and settler communities. The head of the Budget Department at the Ministry of Finance, Yoav Gardos, objected to the allocations, claiming they would exacerbate unemployment in the Orthodox community, which is projected to cost the economy a total of 6.7 trillion shekels in lost produce by 2065. At the onset of the Gaza war and the declaration of a state of national emergency, Minister of Finance Bezalel Smotrich instructed government agencies to continue with the planned distribution of discretionary funds. Corruption During March 2023, the government was promoting an amendment to the Law on Public Service (Gifts) that would allow Netanyahu to receive donations to fund his legal defense. The amendment follows a decision by the High Court of Justice (HCJ) that forced Netanyahu to refund US$270,000 given to him and his wife by his late cousin, Nathan Mileikowsky, for their legal defense. This is in contrast to past statements by Minister of Justice Yariv Levin, who spoke against the possible conflict of interests that can result from such transactions. The bill was opposed by the Attorney General Gali Baharav-Miara, who stressed that it could "create a real opportunity for governmental corruption", and was eventually withdrawn at the end of March. As of March 2023, the coalition was promoting a bill that would prevent judicial review of ministerial appointments. The bill is intended to prevent the HCJ from reviewing the appointment of the twice-convicted chairman of Shas, Aryeh Deri (convicted of bribery, fraud, and breach of trust), to a ministerial position, after his previous appointment was annulled on grounds of unreasonableness. The bill follows on the heels of another amendment, that relaxed the ban on the appointment of convicted criminals, so that Deri - who was handed a suspended sentence after his second conviction - could be appointed. The bill is opposed by the Attorney General, as well as by the Knesset Legal Adviser, Sagit Afik. Israeli law allows for declaring a Prime Minister (as well as several other high-ranking public officials) to be temporarily or permanently incapacitated, but does not specify the conditions which can lead to a declaration of incapacitation. In the case of the Prime Minister, the authority to do so is given to the Attorney General. In March 2023, the coalition advanced a bill that passes this authority from the Attorney General to the government with the approval of the Knesset committee, and clarified that incapacitation can only result from medical or mental conditions. On 3 January 2024, the Supreme Court ruled by a majority of 6 out of 11 that the validity of the law will be postponed to the next Knesset because the bill in its immediate application is a personal law and is intended to serve a distinct personal purpose. Later, the court rejected a petition regarding the definition of Netanyahu as an incapacitated prime minister due to his ongoing trial and conflict of interests. Notes References External links |
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[SOURCE: https://en.wikipedia.org/wiki/Orion_Molecular_Clouds] | [TOKENS: 716] |
Contents Orion Molecular Clouds The Orion Molecular Clouds (OMC) form collectively a filament cloud and are star-forming regions located behind the Orion Nebula and are seen as dark clouds between the Orion Nebula and Sh 2-279. The filament is part of the molecular cloud Orion A, which is part of the Orion molecular cloud complex. The Orion Molecular Clouds are divided into four parts: OMC-1, OMC-2, OMC-3 and OMC-4. Material in the OMCs and material in the foreground from the Orion Nebula prevent observations in shorter wavelengths and therefore the OMC is often observed with radio telescopes and with infrared telescopes. Orion Molecular Cloud 1 The OMC-1 is located behind the Orion Nebula. Most notable the OMC-1 contains the Kleinmann-Low nebula (KL nebula) in its center. While the KL nebula and the protostars in the core of OMC-1 are located only 90 arcseconds from the Trapezium cluster, the OMC-1 is actually a few tenths of a parsec behind the Trapezium cluster. The material of the OMC-1 shields the protostars from the intense radiation of the Trapezium cluster. Scientists used ALMA to image the disks around 51 sources in the OMC-1 and the study has shown that the disk size of these sources is similar to the disk sizes of protostars in the Orion Nebula Cluster. The KL nebula is the place of likely collision between two protostellar systems. The release of the gravitational energy and the possible merger of two stars released a large amount of energy, leading to the explosion remnant of the KL nebula with ejected material and the ejection of stars in different directions, most notably two massive protostars called the Becklin-Neugebauer object and the radio source I. Orion Molecular Cloud 2 OMC-2 is located north of OMC-1. It has multiple protostars. First discovered in 1990 the far-infrared sources FIR 1-6 are today associated with protostars. FIR 4 for example is associated with the class 0 protostar HOPS 108 and FIR 3 is the class I protostar HOPS 370, which launches a large outflow. HOPS 370 for example is an intermediate-massive protostar (~2.5 M☉) that is well studied. It is surrounded by a near edge-on circumstellar disk, with a radius of around 100 astronomical units. Rotation of the disk was detected with the help of molecular emission lines. Orion Molecular Cloud 3 OMC-3 is located north of OMC-1 in between the Orion Nebula and Sh 2-279. Unlike the other clouds it does not have a north-south orientation, but instead has an orientation that is more east-to-west. Prominent protostars are sources that were discovered in 1997 and are shortened to MMS 1–10 (Millimeter Source). MMS 1–7 are surrounded by disk-like structures and show carbon monoxide outflows. Orion Molecular Cloud 4 OMC-4 is located to the south of OMC-1. It has a dominating strong magnetic field that is unfavourable for star formation and has less protostars than OMC-3. It appears more clumpy than the more filament-like OMC-3. See also References |
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[SOURCE: https://en.wikipedia.org/wiki/Animal#cite_note-175] | [TOKENS: 6011] |
Contents Animal Animals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia (/ˌænɪˈmeɪliə/). With few exceptions, animals consume organic material, breathe oxygen, have myocytes and are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Animals form a clade, meaning that they arose from a single common ancestor. Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft). They have complex ecologies and interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology, and the study of animal behaviour is known as ethology. The animal kingdom is divided into five major clades, namely Porifera, Ctenophora, Placozoa, Cnidaria and Bilateria. Most living animal species belong to the clade Bilateria, a highly proliferative clade whose members have a bilaterally symmetric and significantly cephalised body plan, and the vast majority of bilaterians belong to two large clades: the protostomes, which includes organisms such as arthropods, molluscs, flatworms, annelids and nematodes; and the deuterostomes, which include echinoderms, hemichordates and chordates, the latter of which contains the vertebrates. The much smaller basal phylum Xenacoelomorpha have an uncertain position within Bilateria. Animals first appeared in the fossil record in the late Cryogenian period and diversified in the subsequent Ediacaran period in what is known as the Avalon explosion. Nearly all modern animal phyla first appeared in the fossil record as marine species during the Cambrian explosion, which began around 539 million years ago (Mya), and most classes during the Ordovician radiation 485.4 Mya. Common to all living animals, 6,331 groups of genes have been identified that may have arisen from a single common ancestor that lived about 650 Mya during the Cryogenian period. Historically, Aristotle divided animals into those with blood and those without. Carl Linnaeus created the first hierarchical biological classification for animals in 1758 with his Systema Naturae, which Jean-Baptiste Lamarck expanded into 14 phyla by 1809. In 1874, Ernst Haeckel divided the animal kingdom into the multicellular Metazoa (now synonymous with Animalia) and the Protozoa, single-celled organisms no longer considered animals. In modern times, the biological classification of animals relies on advanced techniques, such as molecular phylogenetics, which are effective at demonstrating the evolutionary relationships between taxa. Humans make use of many other animal species for food (including meat, eggs, and dairy products), for materials (such as leather, fur, and wool), as pets and as working animals for transportation, and services. Dogs, the first domesticated animal, have been used in hunting, in security and in warfare, as have horses, pigeons and birds of prey; while other terrestrial and aquatic animals are hunted for sports, trophies or profits. Non-human animals are also an important cultural element of human evolution, having appeared in cave arts and totems since the earliest times, and are frequently featured in mythology, religion, arts, literature, heraldry, politics, and sports. Etymology The word animal comes from the Latin noun animal of the same meaning, which is itself derived from Latin animalis 'having breath or soul'. The biological definition includes all members of the kingdom Animalia. In colloquial usage, the term animal is often used to refer only to nonhuman animals. The term metazoa is derived from Ancient Greek μετα meta 'after' (in biology, the prefix meta- stands for 'later') and ζῷᾰ zōia 'animals', plural of ζῷον zōion 'animal'. A metazoan is any member of the group Metazoa. Characteristics Animals have several characteristics that they share with other living things. Animals are eukaryotic, multicellular, and aerobic, as are plants and fungi. Unlike plants and algae, which produce their own food, animals cannot produce their own food, a feature they share with fungi. Animals ingest organic material and digest it internally. Animals have structural characteristics that set them apart from all other living things: Typically, there is an internal digestive chamber with either one opening (in Ctenophora, Cnidaria, and flatworms) or two openings (in most bilaterians). Animal development is controlled by Hox genes, which signal the times and places to develop structures such as body segments and limbs. During development, the animal extracellular matrix forms a relatively flexible framework upon which cells can move about and be reorganised into specialised tissues and organs, making the formation of complex structures possible, and allowing cells to be differentiated. The extracellular matrix may be calcified, forming structures such as shells, bones, and spicules. In contrast, the cells of other multicellular organisms (primarily algae, plants, and fungi) are held in place by cell walls, and so develop by progressive growth. Nearly all animals make use of some form of sexual reproduction. They produce haploid gametes by meiosis; the smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova. These fuse to form zygotes, which develop via mitosis into a hollow sphere, called a blastula. In sponges, blastula larvae swim to a new location, attach to the seabed, and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber and two separate germ layers, an external ectoderm and an internal endoderm. In most cases, a third germ layer, the mesoderm, also develops between them. These germ layers then differentiate to form tissues and organs. Repeated instances of mating with a close relative during sexual reproduction generally leads to inbreeding depression within a population due to the increased prevalence of harmful recessive traits. Animals have evolved numerous mechanisms for avoiding close inbreeding. Some animals are capable of asexual reproduction, which often results in a genetic clone of the parent. This may take place through fragmentation; budding, such as in Hydra and other cnidarians; or parthenogenesis, where fertile eggs are produced without mating, such as in aphids. Ecology Animals are categorised into ecological groups depending on their trophic levels and how they consume organic material. Such groupings include carnivores (further divided into subcategories such as piscivores, insectivores, ovivores, etc.), herbivores (subcategorised into folivores, graminivores, frugivores, granivores, nectarivores, algivores, etc.), omnivores, fungivores, scavengers/detritivores, and parasites. Interactions between animals of each biome form complex food webs within that ecosystem. In carnivorous or omnivorous species, predation is a consumer–resource interaction where the predator feeds on another organism, its prey, who often evolves anti-predator adaptations to avoid being fed upon. Selective pressures imposed on one another lead to an evolutionary arms race between predator and prey, resulting in various antagonistic/competitive coevolutions. Almost all multicellular predators are animals. Some consumers use multiple methods; for example, in parasitoid wasps, the larvae feed on the hosts' living tissues, killing them in the process, but the adults primarily consume nectar from flowers. Other animals may have very specific feeding behaviours, such as hawksbill sea turtles which mainly eat sponges. Most animals rely on biomass and bioenergy produced by plants and phytoplanktons (collectively called producers) through photosynthesis. Herbivores, as primary consumers, eat the plant material directly to digest and absorb the nutrients, while carnivores and other animals on higher trophic levels indirectly acquire the nutrients by eating the herbivores or other animals that have eaten the herbivores. Animals oxidise carbohydrates, lipids, proteins and other biomolecules in cellular respiration, which allows the animal to grow and to sustain basal metabolism and fuel other biological processes such as locomotion. Some benthic animals living close to hydrothermal vents and cold seeps on the dark sea floor consume organic matter produced through chemosynthesis (via oxidising inorganic compounds such as hydrogen sulfide) by archaea and bacteria. Animals originated in the ocean; all extant animal phyla, except for Micrognathozoa and Onychophora, feature at least some marine species. However, several lineages of arthropods begun to colonise land around the same time as land plants, probably between 510 and 471 million years ago, during the Late Cambrian or Early Ordovician. Vertebrates such as the lobe-finned fish Tiktaalik started to move on to land in the late Devonian, about 375 million years ago. Other notable animal groups that colonized land environments are Mollusca, Platyhelmintha, Annelida, Tardigrada, Onychophora, Rotifera, Nematoda. Animals occupy virtually all of earth's habitats and microhabitats, with faunas adapted to salt water, hydrothermal vents, fresh water, hot springs, swamps, forests, pastures, deserts, air, and the interiors of other organisms. Animals are however not particularly heat tolerant; very few of them can survive at constant temperatures above 50 °C (122 °F) or in the most extreme cold deserts of continental Antarctica. The collective global geomorphic influence of animals on the processes shaping the Earth's surface remains largely understudied, with most studies limited to individual species and well-known exemplars. Diversity The blue whale (Balaenoptera musculus) is the largest animal that has ever lived, weighing up to 190 tonnes and measuring up to 33.6 metres (110 ft) long. The largest extant terrestrial animal is the African bush elephant (Loxodonta africana), weighing up to 12.25 tonnes and measuring up to 10.67 metres (35.0 ft) long. The largest terrestrial animals that ever lived were titanosaur sauropod dinosaurs such as Argentinosaurus, which may have weighed as much as 73 tonnes, and Supersaurus which may have reached 39 metres. Several animals are microscopic; some Myxozoa (obligate parasites within the Cnidaria) never grow larger than 20 μm, and one of the smallest species (Myxobolus shekel) is no more than 8.5 μm when fully grown. The following table lists estimated numbers of described extant species for the major animal phyla, along with their principal habitats (terrestrial, fresh water, and marine), and free-living or parasitic ways of life. Species estimates shown here are based on numbers described scientifically; much larger estimates have been calculated based on various means of prediction, and these can vary wildly. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000–20,000; 500,000; 10 million; and 100 million. Using patterns within the taxonomic hierarchy, the total number of animal species—including those not yet described—was calculated to be about 7.77 million in 2011.[a] 3,000–6,500 4,000–25,000 Evolutionary origin Evidence of animals is found as long ago as the Cryogenian period. 24-Isopropylcholestane (24-ipc) has been found in rocks from roughly 650 million years ago; it is only produced by sponges and pelagophyte algae. Its likely origin is from sponges based on molecular clock estimates for the origin of 24-ipc production in both groups. Analyses of pelagophyte algae consistently recover a Phanerozoic origin, while analyses of sponges recover a Neoproterozoic origin, consistent with the appearance of 24-ipc in the fossil record. The first body fossils of animals appear in the Ediacaran, represented by forms such as Charnia and Spriggina. It had long been doubted whether these fossils truly represented animals, but the discovery of the animal lipid cholesterol in fossils of Dickinsonia establishes their nature. Animals are thought to have originated under low-oxygen conditions, suggesting that they were capable of living entirely by anaerobic respiration, but as they became specialised for aerobic metabolism they became fully dependent on oxygen in their environments. Many animal phyla first appear in the fossil record during the Cambrian explosion, starting about 539 million years ago, in beds such as the Burgess Shale. Extant phyla in these rocks include molluscs, brachiopods, onychophorans, tardigrades, arthropods, echinoderms and hemichordates, along with numerous now-extinct forms such as the predatory Anomalocaris. The apparent suddenness of the event may however be an artefact of the fossil record, rather than showing that all these animals appeared simultaneously. That view is supported by the discovery of Auroralumina attenboroughii, the earliest known Ediacaran crown-group cnidarian (557–562 mya, some 20 million years before the Cambrian explosion) from Charnwood Forest, England. It is thought to be one of the earliest predators, catching small prey with its nematocysts as modern cnidarians do. Some palaeontologists have suggested that animals appeared much earlier than the Cambrian explosion, possibly as early as 1 billion years ago. Early fossils that might represent animals appear for example in the 665-million-year-old rocks of the Trezona Formation of South Australia. These fossils are interpreted as most probably being early sponges. Trace fossils such as tracks and burrows found in the Tonian period (from 1 gya) may indicate the presence of triploblastic worm-like animals, roughly as large (about 5 mm wide) and complex as earthworms. However, similar tracks are produced by the giant single-celled protist Gromia sphaerica, so the Tonian trace fossils may not indicate early animal evolution. Around the same time, the layered mats of microorganisms called stromatolites decreased in diversity, perhaps due to grazing by newly evolved animals. Objects such as sediment-filled tubes that resemble trace fossils of the burrows of wormlike animals have been found in 1.2 gya rocks in North America, in 1.5 gya rocks in Australia and North America, and in 1.7 gya rocks in Australia. Their interpretation as having an animal origin is disputed, as they might be water-escape or other structures. Phylogeny Animals are monophyletic, meaning they are derived from a common ancestor. Animals are the sister group to the choanoflagellates, with which they form the Choanozoa. Ros-Rocher and colleagues (2021) trace the origins of animals to unicellular ancestors, providing the external phylogeny shown in the cladogram. Uncertainty of relationships is indicated with dashed lines. The animal clade had certainly originated by 650 mya, and may have come into being as much as 800 mya, based on molecular clock evidence for different phyla. Holomycota (inc. fungi) Ichthyosporea Pluriformea Filasterea The relationships at the base of the animal tree have been debated. Other than Ctenophora, the Bilateria and Cnidaria are the only groups with symmetry, and other evidence shows they are closely related. In addition to sponges, Placozoa has no symmetry and was often considered a "missing link" between protists and multicellular animals. The presence of hox genes in Placozoa shows that they were once more complex. The Porifera (sponges) have long been assumed to be sister to the rest of the animals, but there is evidence that the Ctenophora may be in that position. Molecular phylogenetics has supported both the sponge-sister and ctenophore-sister hypotheses. In 2017, Roberto Feuda and colleagues, using amino acid differences, presented both, with the following cladogram for the sponge-sister view that they supported (their ctenophore-sister tree simply interchanging the places of ctenophores and sponges): Porifera Ctenophora Placozoa Cnidaria Bilateria Conversely, a 2023 study by Darrin Schultz and colleagues uses ancient gene linkages to construct the following ctenophore-sister phylogeny: Ctenophora Porifera Placozoa Cnidaria Bilateria Sponges are physically very distinct from other animals, and were long thought to have diverged first, representing the oldest animal phylum and forming a sister clade to all other animals. Despite their morphological dissimilarity with all other animals, genetic evidence suggests sponges may be more closely related to other animals than the comb jellies are. Sponges lack the complex organisation found in most other animal phyla; their cells are differentiated, but in most cases not organised into distinct tissues, unlike all other animals. They typically feed by drawing in water through pores, filtering out small particles of food. The Ctenophora and Cnidaria are radially symmetric and have digestive chambers with a single opening, which serves as both mouth and anus. Animals in both phyla have distinct tissues, but these are not organised into discrete organs. They are diploblastic, having only two main germ layers, ectoderm and endoderm. The tiny placozoans have no permanent digestive chamber and no symmetry; they superficially resemble amoebae. Their phylogeny is poorly defined, and under active research. The remaining animals, the great majority—comprising some 29 phyla and over a million species—form the Bilateria clade, which have a bilaterally symmetric body plan. The Bilateria are triploblastic, with three well-developed germ layers, and their tissues form distinct organs. The digestive chamber has two openings, a mouth and an anus, and in the Nephrozoa there is an internal body cavity, a coelom or pseudocoelom. These animals have a head end (anterior) and a tail end (posterior), a back (dorsal) surface and a belly (ventral) surface, and a left and a right side. A modern consensus phylogenetic tree for the Bilateria is shown below. Xenacoelomorpha Ambulacraria Chordata Ecdysozoa Spiralia Having a front end means that this part of the body encounters stimuli, such as food, favouring cephalisation, the development of a head with sense organs and a mouth. Many bilaterians have a combination of circular muscles that constrict the body, making it longer, and an opposing set of longitudinal muscles, that shorten the body; these enable soft-bodied animals with a hydrostatic skeleton to move by peristalsis. They also have a gut that extends through the basically cylindrical body from mouth to anus. Many bilaterian phyla have primary larvae which swim with cilia and have an apical organ containing sensory cells. However, over evolutionary time, descendant spaces have evolved which have lost one or more of each of these characteristics. For example, adult echinoderms are radially symmetric (unlike their larvae), while some parasitic worms have extremely simplified body structures. Genetic studies have considerably changed zoologists' understanding of the relationships within the Bilateria. Most appear to belong to two major lineages, the protostomes and the deuterostomes. It is often suggested that the basalmost bilaterians are the Xenacoelomorpha, with all other bilaterians belonging to the subclade Nephrozoa. However, this suggestion has been contested, with other studies finding that xenacoelomorphs are more closely related to Ambulacraria than to other bilaterians. Protostomes and deuterostomes differ in several ways. Early in development, deuterostome embryos undergo radial cleavage during cell division, while many protostomes (the Spiralia) undergo spiral cleavage. Animals from both groups possess a complete digestive tract, but in protostomes the first opening of the embryonic gut develops into the mouth, and the anus forms secondarily. In deuterostomes, the anus forms first while the mouth develops secondarily. Most protostomes have schizocoelous development, where cells simply fill in the interior of the gastrula to form the mesoderm. In deuterostomes, the mesoderm forms by enterocoelic pouching, through invagination of the endoderm. The main deuterostome taxa are the Ambulacraria and the Chordata. Ambulacraria are exclusively marine and include acorn worms, starfish, sea urchins, and sea cucumbers. The chordates are dominated by the vertebrates (animals with backbones), which consist of fishes, amphibians, reptiles, birds, and mammals. The protostomes include the Ecdysozoa, named after their shared trait of ecdysis, growth by moulting, Among the largest ecdysozoan phyla are the arthropods and the nematodes. The rest of the protostomes are in the Spiralia, named for their pattern of developing by spiral cleavage in the early embryo. Major spiralian phyla include the annelids and molluscs. History of classification In the classical era, Aristotle divided animals,[d] based on his own observations, into those with blood (roughly, the vertebrates) and those without. The animals were then arranged on a scale from man (with blood, two legs, rational soul) down through the live-bearing tetrapods (with blood, four legs, sensitive soul) and other groups such as crustaceans (no blood, many legs, sensitive soul) down to spontaneously generating creatures like sponges (no blood, no legs, vegetable soul). Aristotle was uncertain whether sponges were animals, which in his system ought to have sensation, appetite, and locomotion, or plants, which did not: he knew that sponges could sense touch and would contract if about to be pulled off their rocks, but that they were rooted like plants and never moved about. In 1758, Carl Linnaeus created the first hierarchical classification in his Systema Naturae. In his original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then, the last four have all been subsumed into a single phylum, the Chordata, while his Insecta (which included the crustaceans and arachnids) and Vermes have been renamed or broken up. The process was begun in 1793 by Jean-Baptiste de Lamarck, who called the Vermes une espèce de chaos ('a chaotic mess')[e] and split the group into three new phyla: worms, echinoderms, and polyps (which contained corals and jellyfish). By 1809, in his Philosophie Zoologique, Lamarck had created nine phyla apart from vertebrates (where he still had four phyla: mammals, birds, reptiles, and fish) and molluscs, namely cirripedes, annelids, crustaceans, arachnids, insects, worms, radiates, polyps, and infusorians. In his 1817 Le Règne Animal, Georges Cuvier used comparative anatomy to group the animals into four embranchements ('branches' with different body plans, roughly corresponding to phyla), namely vertebrates, molluscs, articulated animals (arthropods and annelids), and zoophytes (radiata) (echinoderms, cnidaria and other forms). This division into four was followed by the embryologist Karl Ernst von Baer in 1828, the zoologist Louis Agassiz in 1857, and the comparative anatomist Richard Owen in 1860. In 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms: Metazoa (multicellular animals, with five phyla: coelenterates, echinoderms, articulates, molluscs, and vertebrates) and Protozoa (single-celled animals), including a sixth animal phylum, sponges. The protozoa were later moved to the former kingdom Protista, leaving only the Metazoa as a synonym of Animalia. In human culture The human population exploits a large number of other animal species for food, both of domesticated livestock species in animal husbandry and, mainly at sea, by hunting wild species. Marine fish of many species are caught commercially for food. A smaller number of species are farmed commercially. Humans and their livestock make up more than 90% of the biomass of all terrestrial vertebrates, and almost as much as all insects combined. Invertebrates including cephalopods, crustaceans, insects—principally bees and silkworms—and bivalve or gastropod molluscs are hunted or farmed for food, fibres. Chickens, cattle, sheep, pigs, and other animals are raised as livestock for meat across the world. Animal fibres such as wool and silk are used to make textiles, while animal sinews have been used as lashings and bindings, and leather is widely used to make shoes and other items. Animals have been hunted and farmed for their fur to make items such as coats and hats. Dyestuffs including carmine (cochineal), shellac, and kermes have been made from the bodies of insects. Working animals including cattle and horses have been used for work and transport from the first days of agriculture. Animals such as the fruit fly Drosophila melanogaster serve a major role in science as experimental models. Animals have been used to create vaccines since their discovery in the 18th century. Some medicines such as the cancer drug trabectedin are based on toxins or other molecules of animal origin. People have used hunting dogs to help chase down and retrieve animals, and birds of prey to catch birds and mammals, while tethered cormorants have been used to catch fish. Poison dart frogs have been used to poison the tips of blowpipe darts. A wide variety of animals are kept as pets, from invertebrates such as tarantulas, octopuses, and praying mantises, reptiles such as snakes and chameleons, and birds including canaries, parakeets, and parrots all finding a place. However, the most kept pet species are mammals, namely dogs, cats, and rabbits. There is a tension between the role of animals as companions to humans, and their existence as individuals with rights of their own. A wide variety of terrestrial and aquatic animals are hunted for sport. The signs of the Western and Chinese zodiacs are based on animals. In China and Japan, the butterfly has been seen as the personification of a person's soul, and in classical representation the butterfly is also the symbol of the soul. Animals have been the subjects of art from the earliest times, both historical, as in ancient Egypt, and prehistoric, as in the cave paintings at Lascaux. Major animal paintings include Albrecht Dürer's 1515 The Rhinoceros, and George Stubbs's c. 1762 horse portrait Whistlejacket. Insects, birds and mammals play roles in literature and film, such as in giant bug movies. Animals including insects and mammals feature in mythology and religion. The scarab beetle was sacred in ancient Egypt, and the cow is sacred in Hinduism. Among other mammals, deer, horses, lions, bats, bears, and wolves are the subjects of myths and worship. See also Notes References External links |
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[SOURCE: https://en.wikipedia.org/wiki/Troll] | [TOKENS: 1867] |
Contents Troll A troll is a being in Nordic folklore, including Norse mythology. In Old Norse sources, beings described as trolls dwell in isolated areas of rocks, mountains, or caves, live together in small family units, and are rarely helpful to human beings. In later Scandinavian folklore, trolls became beings in their own right, where they live far from human habitation, are not Christianized, and are considered dangerous to human beings. Depending on the source, their appearance varies greatly; trolls may be ugly and slow-witted, or look and behave exactly like human beings, with no particularly grotesque characteristic about them. In Scandinavian folklore, trolls are sometimes associated with particular landmarks (sometimes said to have been formed by a troll having been exposed to sunlight). Trolls are depicted in a variety of media in modern popular culture. Etymology The Old Norse nouns troll and trǫll (variously meaning "fiend, demon, werewolf, jötunn") and Middle High German troll, trolle "fiend" (according to philologist Vladimir Orel, the word is likely borrowed from Old Norse), possibly developed from Proto-Germanic neuter noun *trullan, meaning "to tread, step on". The origin of the Proto-Germanic word is unknown. Additionally, the Old Norse verb trylla 'to enchant, to turn into a troll' and the Middle High German verb trüllen "to flutter" both developed from the Proto-Germanic verb *trulljanan, a derivative of *trullan. Norse mythology In Norse mythology, troll, like thurs, is a term applied to jötnar and is mentioned throughout the Old Norse corpus. In Old Norse sources, trolls are said to dwell in isolated mountains, rocks, and caves, sometimes live together (usually as father-and-daughter or mother-and-son), and are rarely described as helpful or friendly. The Prose Edda book Skáldskaparmál describes an encounter between an unnamed troll woman and the 9th-century skald Bragi Boddason. According to the section, Bragi was driving through "a certain forest" late one evening when a troll woman aggressively asked him who he was, in the process describing herself: Old Norse: Anthony Faulkes translation: John Lindow translation: Bragi responds in turn, describing himself and his abilities as a skillful skald, before the scenario ends. There is much confusion and overlap in the use of Old Norse terms jötunn, troll, þurs, and risi, which describe various beings. Lotte Motz theorized that these were originally four distinct classes of beings: lords of nature (jötunn), mythical magicians (troll), hostile monsters (þurs), and heroic and courtly beings (risi), the last class being the youngest addition. On the other hand, Ármann Jakobson is critical of Motz's interpretation and calls this theory "unsupported by any convincing evidence". Ármann highlights that the term is used to denote various beings, such as a jötunn or mountain-dweller, a witch, an abnormally strong or large or ugly person, an evil spirit, a ghost, a blámaðr, a magical boar, a heathen demi-god, a demon, a brunnmigi, or a berserker. Scandinavian folklore Later in Scandinavian folklore, trolls become defined as a particular type of being. Numerous tales are recorded about trolls in which they are frequently described as being extremely old, very strong, but slow and dim-witted, and are at times described as man-eaters and as turning to stone upon contact with sunlight. However, trolls are also attested as looking much the same as human beings, without any particularly hideous appearance about them, but living far away from human habitation and generally having "some form of social organization"—unlike the rå and näck, who are attested as "solitary beings". According to John Lindow, what sets them apart is that they are not Christian, and those who encounter them do not know them. Therefore, trolls were in the end dangerous, regardless of how well they might get along with Christian society, and trolls display a habit of bergtagning ('kidnapping'; literally "mountain-taking") and overrunning a farm or estate. Lindow states that the etymology of the word "troll" remains uncertain, though he defines trolls in later Swedish folklore as "nature beings" and as "all-purpose otherworldly being[s], equivalent, for example, to fairies in Anglo-Celtic traditions". They "therefore appear in various migratory legends where collective nature-beings are called for". Lindow notes that trolls are sometimes swapped out for cats and "little people" in the folklore record. A Scandinavian folk belief that lightning frightens away trolls and jötnar appears in numerous Scandinavian folktales, and may be a late reflection of the god Thor's role in fighting such beings. In connection, the lack of trolls and jötnar in modern Scandinavia is sometimes explained as a result of the "accuracy and efficiency of the lightning strokes". Additionally, the absence of trolls in regions of Scandinavia is described in folklore as being a "consequence of the constant din of the church-bells". This ringing caused the trolls to leave for other lands, although not without some resistance; numerous traditions relate how trolls destroyed a church under construction or hurled boulders and stones at completed churches. Large local stones are sometimes described as the product of a troll's toss. Additionally, into the 20th century, the origins of particular Scandinavian landmarks, such as particular stones, are ascribed to trolls who may, for example, have turned to stone upon exposure to sunlight. Lindow compares the trolls of the Swedish folk tradition to Grendel, the supernatural mead hall invader in the Old English poem Beowulf, and notes that "just as the poem Beowulf emphasizes not the harrying of Grendel but the cleansing of the hall of Beowulf, so the modern tales stress the moment when the trolls are driven off." Smaller trolls are attested as living in burial mounds and in mountains in Scandinavian folk tradition. In Denmark, these creatures are recorded as troldfolk ("troll-folk"), bjergtrolde ("mountain-trolls"), or bjergfolk ("mountain-folk") and in Norway also as trollfolk ("troll-folk") and tusser. Trolls may be described as small, human-like beings or as tall as men depending on the region of origin of the story. In Norwegian tradition, similar tales may be told about the larger trolls and the Huldrefolk ("hidden-folk"), yet a distinction is made between the two. The use of the word trow in Orkney and Shetland, to mean beings which are very like the Huldrefolk in Norway, may suggest a common origin for the terms. The word troll may have been used by pagan Norse settlers in Orkney and Shetland as a collective term for supernatural beings who should be respected and avoided rather than worshipped. Troll could later have become specialized as a description of the larger, more menacing Jötunn-kind whereas Huldrefolk may have developed as the term for smaller trolls. John Arnott MacCulloch posited a connection between the Old Norse vættir and trolls, suggesting that both concepts may derive from spirits of the dead. Troll, a Norwegian research station in Antarctica, is so named because of the rugged mountains which stand around that place like trolls. It includes a ground station which tracks satellites in polar orbit. In popular culture Trolls have appeared in many works of modern fiction, most often in the fantasy genre, with classic examples being the portrayal of trolls in works such as in Tolkien's Middle-earth or the Dungeons & Dragons roleplaying game. Beginning in the 1950s, Troll dolls were a popular toy based on the folklore creature. Trolls based on the dolls appeared in the Hollywood animated movie Trolls (2016) and its subsequent sequels Trolls World Tour (2020), and Trolls Band Together (2023). There were also different types of trolls in the Harry Potter franchise. Troll is the name of a 2022 Norwegian movie released by Netflix on December 1, 2022 that details with the awakening of a 105 ft. troll that sports a rocky body and a cat-like tail. A sequel called Troll 2 released on December 1, 2025. The sequel featured two trolls. Trolls were heavily featured in the 2010 Norwegian found footage movie Trollhunter, directed by André Øvredal. Rolf Lidberg was a Swedish artist well known for his troll illustrations. The Danish artist Thomas Dambo has created from recycled wood a series of monumental troll sculptures that can be seen in several botanic gardens and similar installations. Other It has been hypothesized that the troll myth might have its origin in real-life interactions between anatomically modern humans and Neanderthals. See also Notes References External links |
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[SOURCE: https://en.wikipedia.org/wiki/Black_hole#cite_note-ligovirgo16-60] | [TOKENS: 13839] |
Contents Black hole A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole. The boundary of no escape is called the event horizon. In general relativity, a black hole's event horizon seals an object's fate but produces no locally detectable change when crossed. General relativity also predicts that every black hole should have a central singularity, where the curvature of spacetime is infinite. In many ways, a black hole acts like an ideal black body, as it reflects no light. Quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly. Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. In 1916, Karl Schwarzschild found the first modern solution of general relativity that would characterise a black hole. Due to his influential research, the Schwarzschild metric is named after him. David Finkelstein, in 1958, first interpreted Schwarzschild's model as a region of space from which nothing can escape. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The first black hole known was Cygnus X-1, identified by several researchers independently in 1971. Black holes typically form when massive stars collapse at the end of their life cycle. After a black hole has formed, it can grow by absorbing mass from its surroundings. Supermassive black holes of millions of solar masses may form by absorbing other stars and merging with other black holes, or via direct collapse of gas clouds. There is consensus that supermassive black holes exist in the centres of most galaxies. The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter falling toward a black hole can form an accretion disk of infalling plasma, heated by friction and emitting light. In extreme cases, this creates a quasar, some of the brightest objects in the universe. Merging black holes can also be detected by observation of the gravitational waves they emit. If other stars are orbiting a black hole, their orbits can be used to determine the black hole's mass and location. Such observations can be used to exclude possible alternatives such as neutron stars. In this way, astronomers have identified numerous stellar black hole candidates in binary systems and established that the radio source known as Sagittarius A*, at the core of the Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses. History The idea of a body so massive that even light could not escape was first proposed in the late 18th century by English astronomer and clergyman John Michell and independently by French scientist Pierre-Simon Laplace. Both scholars proposed very large stars in contrast to the modern concept of an extremely dense object. Michell's idea, in a short part of a letter published in 1784, calculated that a star with the same density but 500 times the radius of the sun would not let any emitted light escape; the surface escape velocity would exceed the speed of light.: 122 Michell correctly hypothesized that such supermassive but non-radiating bodies might be detectable through their gravitational effects on nearby visible bodies. In 1796, Laplace mentioned that a star could be invisible if it were sufficiently large while speculating on the origin of the Solar System in his book Exposition du Système du Monde. Franz Xaver von Zach asked Laplace for a mathematical analysis, which Laplace provided and published in a journal edited by von Zach. In 1905, Albert Einstein showed that the laws of electromagnetism would be invariant under a Lorentz transformation: they would be identical for observers travelling at different velocities relative to each other. This discovery became known as the principle of special relativity. Although the laws of mechanics had already been shown to be invariant, gravity remained yet to be included.: 19 In 1907, Einstein published a paper proposing his equivalence principle, the hypothesis that inertial mass and gravitational mass have a common cause. Using the principle, Einstein predicted the redshift and half of the lensing effect of gravity on light; the full prediction of gravitational lensing required development of general relativity.: 19 By 1915, Einstein refined these ideas into his general theory of relativity, which explained how matter affects spacetime, which in turn affects the motion of other matter. This formed the basis for black hole physics. Only a few months after Einstein published the field equations describing general relativity, astrophysicist Karl Schwarzschild set out to apply the idea to stars. He assumed spherical symmetry with no spin and found a solution to Einstein's equations.: 124 A few months after Schwarzschild, Johannes Droste, a student of Hendrik Lorentz, independently gave the same solution. At a certain radius from the center of the mass, the Schwarzschild solution became singular, meaning that some of the terms in the Einstein equations became infinite. The nature of this radius, which later became known as the Schwarzschild radius, was not understood at the time. Many physicists of the early 20th century were skeptical of the existence of black holes. In a 1926 popular science book, Arthur Eddington critiqued the idea of a star with mass compressed to its Schwarzschild radius as a flaw in the then-poorly-understood theory of general relativity.: 134 In 1939, Einstein himself used his theory of general relativity in an attempt to prove that black holes were impossible. His work relied on increasing pressure or increasing centrifugal force balancing the force of gravity so that the object would not collapse beyond its Schwarzschild radius. He missed the possibility that implosion would drive the system below this critical value.: 135 By the 1920s, astronomers had classified a number of white dwarf stars as too cool and dense to be explained by the gradual cooling of ordinary stars. In 1926, Ralph Fowler showed that quantum-mechanical degeneracy pressure was larger than thermal pressure at these densities.: 145 In 1931, Subrahmanyan Chandrasekhar calculated that a non-rotating body of electron-degenerate matter below a certain limiting mass is stable, and by 1934 he showed that this explained the catalog of white dwarf stars.: 151 When Chandrasekhar announced his results, Eddington pointed out that stars above this limit would radiate until they were sufficiently dense to prevent light from exiting, a conclusion he considered absurd. Eddington and, later, Lev Landau argued that some yet unknown mechanism would stop the collapse. In the 1930s, Fritz Zwicky and Walter Baade studied stellar novae, focusing on exceptionally bright ones they called supernovae. Zwicky promoted the idea that supernovae produced stars with the density of atomic nuclei—neutron stars—but this idea was largely ignored.: 171 In 1939, based on Chandrasekhar's reasoning, J. Robert Oppenheimer and George Volkoff predicted that neutron stars below a certain mass limit, later called the Tolman–Oppenheimer–Volkoff limit, would be stable due to neutron degeneracy pressure. Above that limit, they reasoned that either their model would not apply or that gravitational contraction would not stop.: 380 John Archibald Wheeler and two of his students resolved questions about the model behind the Tolman–Oppenheimer–Volkoff (TOV) limit. Harrison and Wheeler developed the equations of state relating density to pressure for cold matter all the way through electron degeneracy and neutron degeneracy. Masami Wakano and Wheeler then used the equations to compute the equilibrium curve for stars, relating mass to circumference. They found no additional features that would invalidate the TOV limit. This meant that the only thing that could prevent black holes from forming was a dynamic process ejecting sufficient mass from a star as it cooled.: 205 The modern concept of black holes was formulated by Robert Oppenheimer and his student Hartland Snyder in 1939.: 80 In the paper, Oppenheimer and Snyder solved Einstein's equations of general relativity for an idealized imploding star, in a model later called the Oppenheimer–Snyder model, then described the results from far outside the star. The implosion starts as one might expect: the star material rapidly collapses inward. However, as the density of the star increases, gravitational time dilation increases and the collapse, viewed from afar, seems to slow down further and further until the star reaches its Schwarzschild radius, where it appears frozen in time.: 217 In 1958, David Finkelstein identified the Schwarzschild surface as an event horizon, calling it "a perfect unidirectional membrane: causal influences can cross it in only one direction". In this sense, events that occur inside of the black hole cannot affect events that occur outside of the black hole. Finkelstein created a new reference frame to include the point of view of infalling observers.: 103 Finkelstein's new frame of reference allowed events at the surface of an imploding star to be related to events far away. By 1962 the two points of view were reconciled, convincing many skeptics that implosion into a black hole made physical sense.: 226 The era from the mid-1960s to the mid-1970s was the "golden age of black hole research", when general relativity and black holes became mainstream subjects of research.: 258 In this period, more general black hole solutions were found. In 1963, Roy Kerr found the exact solution for a rotating black hole. Two years later, Ezra Newman found the cylindrically symmetric solution for a black hole that is both rotating and electrically charged. In 1967, Werner Israel found that the Schwarzschild solution was the only possible solution for a nonspinning, uncharged black hole, meaning that a Schwarzschild black hole would be defined by its mass alone. Similar identities were later found for Reissner-Nordstrom and Kerr black holes, defined only by their mass and their charge or spin respectively. Together, these findings became known as the no-hair theorem, which states that a stationary black hole is completely described by the three parameters of the Kerr–Newman metric: mass, angular momentum, and electric charge. At first, it was suspected that the strange mathematical singularities found in each of the black hole solutions only appeared due to the assumption that a black hole would be perfectly spherically symmetric, and therefore the singularities would not appear in generic situations where black holes would not necessarily be symmetric. This view was held in particular by Vladimir Belinski, Isaak Khalatnikov, and Evgeny Lifshitz, who tried to prove that no singularities appear in generic solutions, although they would later reverse their positions. However, in 1965, Roger Penrose proved that general relativity without quantum mechanics requires that singularities appear in all black holes. Astronomical observations also made great strides during this era. In 1967, Antony Hewish and Jocelyn Bell Burnell discovered pulsars and by 1969, these were shown to be rapidly rotating neutron stars. Until that time, neutron stars, like black holes, were regarded as just theoretical curiosities, but the discovery of pulsars showed their physical relevance and spurred a further interest in all types of compact objects that might be formed by gravitational collapse. Based on observations in Greenwich and Toronto in the early 1970s, Cygnus X-1, a galactic X-ray source discovered in 1964, became the first astronomical object commonly accepted to be a black hole. Work by James Bardeen, Jacob Bekenstein, Carter, and Hawking in the early 1970s led to the formulation of black hole thermodynamics. These laws describe the behaviour of a black hole in close analogy to the laws of thermodynamics by relating mass to energy, area to entropy, and surface gravity to temperature. The analogy was completed: 442 when Hawking, in 1974, showed that quantum field theory implies that black holes should radiate like a black body with a temperature proportional to the surface gravity of the black hole, predicting the effect now known as Hawking radiation. While Cygnus X-1, a stellar-mass black hole, was generally accepted by the scientific community as a black hole by the end of 1973, it would be decades before a supermassive black hole would gain the same broad recognition. Although, as early as the 1960s, physicists such as Donald Lynden-Bell and Martin Rees had suggested that powerful quasars in the center of galaxies were powered by accreting supermassive black holes, little observational proof existed at the time. However, the Hubble Space Telescope, launched decades later, found that supermassive black holes were not only present in these active galactic nuclei, but that supermassive black holes in the center of galaxies were ubiquitous: Almost every galaxy had a supermassive black hole at its center, many of which were quiescent. In 1999, David Merritt proposed the M–sigma relation, which related the dispersion of the velocity of matter in the center bulge of a galaxy to the mass of the supermassive black hole at its core. Subsequent studies confirmed this correlation. Around the same time, based on telescope observations of the velocities of stars at the center of the Milky Way galaxy, independent work groups led by Andrea Ghez and Reinhard Genzel concluded that the compact radio source in the center of the galaxy, Sagittarius A*, was likely a supermassive black hole. On 11 February 2016, the LIGO Scientific Collaboration and Virgo Collaboration announced the first direct detection of gravitational waves, named GW150914, representing the first observation of a black hole merger. At the time of the merger, the black holes were approximately 1.4 billion light-years away from Earth and had masses of 30 and 35 solar masses.: 6 In 2017, Rainer Weiss, Kip Thorne, and Barry Barish, who had spearheaded the project, were awarded the Nobel Prize in Physics for their work. Since the initial discovery in 2015, hundreds more gravitational waves have been observed by LIGO and another interferometer, Virgo. On 10 April 2019, the first direct image of a black hole and its vicinity was published, following observations made by the Event Horizon Telescope (EHT) in 2017 of the supermassive black hole in Messier 87's galactic centre. In 2022, the Event Horizon Telescope collaboration released an image of the black hole in the center of the Milky Way galaxy, Sagittarius A*; The data had been collected in 2017. In 2020, the Nobel Prize in Physics was awarded for work on black holes. Andrea Ghez and Reinhard Genzel shared one-half for their discovery that Sagittarius A* is a supermassive black hole. Penrose received the other half for his work showing that the mathematics of general relativity requires the formation of black holes. Cosmologists lamented that Hawking's extensive theoretical work on black holes would not be honored since he died in 2018. In December 1967, a student reportedly suggested the phrase black hole at a lecture by John Wheeler; Wheeler adopted the term for its brevity and "advertising value", and Wheeler's stature in the field ensured it quickly caught on, leading some to credit Wheeler with coining the phrase. However, the term was used by others around that time. Science writer Marcia Bartusiak traces the term black hole to physicist Robert H. Dicke, who in the early 1960s reportedly compared the phenomenon to the Black Hole of Calcutta, notorious as a prison where people entered but never left alive. The term was used in print by Life and Science News magazines in 1963, and by science journalist Ann Ewing in her article "'Black Holes' in Space", dated 18 January 1964, which was a report on a meeting of the American Association for the Advancement of Science held in Cleveland, Ohio. Definition A black hole is generally defined as a region of spacetime from which no information-carrying signals or objects can escape. However, verifying an object as a black hole by this definition would require waiting for an infinite time and at an infinite distance from the black hole to verify that indeed, nothing has escaped, and thus cannot be used to identify a physical black hole. Broadly, physicists do not have a precisely-agreed-upon definition of a black hole. Among astrophysicists, a black hole is a compact object with a mass larger than four solar masses. A black hole may also be defined as a reservoir of information: 142 or a region where space is falling inwards faster than the speed of light. Properties The no-hair theorem postulates that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, electric charge, and angular momentum; the black hole is otherwise featureless. If the conjecture is true, any two black holes that share the same values for these properties, or parameters, are indistinguishable from one another. The degree to which the conjecture is true for real black holes is currently an unsolved problem. The simplest static black holes have mass but neither electric charge nor angular momentum. According to Birkhoff's theorem, these Schwarzschild black holes are the only vacuum solution that is spherically symmetric. Solutions describing more general black holes also exist. Non-rotating charged black holes are described by the Reissner–Nordström metric, while the Kerr metric describes a non-charged rotating black hole. The most general stationary black hole solution known is the Kerr–Newman metric, which describes a black hole with both charge and angular momentum. The simplest static black holes have mass but neither electric charge nor angular momentum. Contrary to the popular notion of a black hole "sucking in everything" in its surroundings, from far away, the external gravitational field of a black hole is identical to that of any other body of the same mass. While a black hole can theoretically have any positive mass, the charge and angular momentum are constrained by the mass. The total electric charge Q and the total angular momentum J are expected to satisfy the inequality Q 2 4 π ϵ 0 + c 2 J 2 G M 2 ≤ G M 2 {\displaystyle {\frac {Q^{2}}{4\pi \epsilon _{0}}}+{\frac {c^{2}J^{2}}{GM^{2}}}\leq GM^{2}} for a black hole of mass M. Black holes with the maximum possible charge or spin satisfying this inequality are called extremal black holes. Solutions of Einstein's equations that violate this inequality exist, but they do not possess an event horizon. These are so-called naked singularities that can be observed from the outside. Because these singularities make the universe inherently unpredictable, many physicists believe they could not exist. The weak cosmic censorship hypothesis, proposed by Sir Roger Penrose, rules out the formation of such singularities, when they are created through the gravitational collapse of realistic matter. However, this theory has not yet been proven, and some physicists believe that naked singularities could exist. It is also unknown whether black holes could even become extremal, forming naked singularities, since natural processes counteract increasing spin and charge when a black hole becomes near-extremal. The total mass of a black hole can be estimated by analyzing the motion of objects near the black hole, such as stars or gas. All black holes spin, often fast—One supermassive black hole, GRS 1915+105 has been estimated to spin at over 1,000 revolutions per second. The Milky Way's central black hole Sagittarius A* rotates at about 90% of the maximum rate. The spin rate can be inferred from measurements of atomic spectral lines in the X-ray range. As gas near the black hole plunges inward, high energy X-ray emission from electron-positron pairs illuminates the gas further out, appearing red-shifted due to relativistic effects. Depending on the spin of the black hole, this plunge happens at different radii from the hole, with different degrees of redshift. Astronomers can use the gap between the x-ray emission of the outer disk and the redshifted emission from plunging material to determine the spin of the black hole. A newer way to estimate spin is based on the temperature of gasses accreting onto the black hole. The method requires an independent measurement of the black hole mass and inclination angle of the accretion disk followed by computer modeling. Gravitational waves from coalescing binary black holes can also provide the spin of both progenitor black holes and the merged hole, but such events are rare. A spinning black hole has angular momentum. The supermassive black hole in the center of the Messier 87 (M87) galaxy appears to have an angular momentum very close to the maximum theoretical value. That uncharged limit is J ≤ G M 2 c , {\displaystyle J\leq {\frac {GM^{2}}{c}},} allowing definition of a dimensionless spin magnitude such that 0 ≤ c J G M 2 ≤ 1. {\displaystyle 0\leq {\frac {cJ}{GM^{2}}}\leq 1.} Most black holes are believed to have an approximately neutral charge. For example, Michal Zajaček, Arman Tursunov, Andreas Eckart, and Silke Britzen found the electric charge of Sagittarius A* to be at least ten orders of magnitude below the theoretical maximum. A charged black hole repels other like charges just like any other charged object. If a black hole were to become charged, particles with an opposite sign of charge would be pulled in by the extra electromagnetic force, while particles with the same sign of charge would be repelled, neutralizing the black hole. This effect may not be as strong if the black hole is also spinning. The presence of charge can reduce the diameter of the black hole by up to 38%. The charge Q for a nonspinning black hole is bounded by Q ≤ G M , {\displaystyle Q\leq {\sqrt {G}}M,} where G is the gravitational constant and M is the black hole's mass. Classification Black holes can have a wide range of masses. The minimum mass of a black hole formed by stellar gravitational collapse is governed by the maximum mass of a neutron star and is believed to be approximately two-to-four solar masses. However, theoretical primordial black holes, believed to have formed soon after the Big Bang, could be far smaller, with masses as little as 10−5 grams at formation. These very small black holes are sometimes called micro black holes. Black holes formed by stellar collapse are called stellar black holes. Estimates of their maximum mass at formation vary, but generally range from 10 to 100 solar masses, with higher estimates for black holes progenated by low-metallicity stars. The mass of a black hole formed via a supernova has a lower bound: If the progenitor star is too small, the collapse may be stopped by the degeneracy pressure of the star's constituents, allowing the condensation of matter into an exotic denser state. Degeneracy pressure occurs from the Pauli exclusion principle—Particles will resist being in the same place as each other. Smaller progenitor stars, with masses less than about 8 M☉, will be held together by the degeneracy pressure of electrons and will become a white dwarf. For more massive progenitor stars, electron degeneracy pressure is no longer strong enough to resist the force of gravity and the star will be held together by neutron degeneracy pressure, which can occur at much higher densities, forming a neutron star. If the star is still too massive, even neutron degeneracy pressure will not be able to resist the force of gravity and the star will collapse into a black hole.: 5.8 Stellar black holes can also gain mass via accretion of nearby matter, often from a companion object such as a star. Black holes that are larger than stellar black holes but smaller than supermassive black holes are called intermediate-mass black holes, with masses of approximately 102 to 105 solar masses. These black holes seem to be rarer than their stellar and supermassive counterparts, with relatively few candidates having been observed. Physicists have speculated that such black holes may form from collisions in globular and star clusters or at the center of low-mass galaxies. They may also form as the result of mergers of smaller black holes, with several LIGO observations finding merged black holes within the 110-350 solar mass range. The black holes with the largest masses are called supermassive black holes, with masses more than 106 times that of the Sun. These black holes are believed to exist at the centers of almost every large galaxy, including the Milky Way. Some scientists have proposed a subcategory of even larger black holes, called ultramassive black holes, with masses greater than 109-1010 solar masses. Theoretical models predict that the accretion disc that feeds black holes will be unstable once a black hole reaches 50-100 billion times the mass of the Sun, setting a rough upper limit to black hole mass. Structure While black holes are conceptually invisible sinks of all matter and light, in astronomical settings, their enormous gravity alters the motion of surrounding objects and pulls nearby gas inwards at near-light speed, making the area around black holes the brightest objects in the universe. Some black holes have relativistic jets—thin streams of plasma travelling away from the black hole at more than one-tenth of the speed of light. A small faction of the matter falling towards the black hole gets accelerated away along the hole rotation axis. These jets can extend as far as millions of parsecs from the black hole itself. Black holes of any mass can have jets. However, they are typically observed around spinning black holes with strongly-magnetized accretion disks. Relativistic jets were more common in the early universe, when galaxies and their corresponding supermassive black holes were rapidly gaining mass. All black holes with jets also have an accretion disk, but the jets are usually brighter than the disk. Quasars, typically found in other galaxies, are believed to be supermassive black holes with jets; microquasars are believed to be stellar-mass objects with jets, typically observed in the Milky Way. The mechanism of formation of jets is not yet known, but several options have been proposed. One method proposed to fuel these jets is the Blandford-Znajek process, which suggests that the dragging of magnetic field lines by a black hole's rotation could launch jets of matter into space. The Penrose process, which involves extraction of a black hole's rotational energy, has also been proposed as a potential mechanism of jet propulsion. Due to conservation of angular momentum, gas falling into the gravitational well created by a massive object will typically form a disk-like structure around the object.: 242 As the disk's angular momentum is transferred outward due to internal processes, its matter falls farther inward, converting its gravitational energy into heat and releasing a large flux of x-rays. The temperature of these disks can range from thousands to millions of Kelvin, and temperatures can differ throughout a single accretion disk. Accretion disks can also emit in other parts of the electromagnetic spectrum, depending on the disk's turbulence and magnetization and the black hole's mass and angular momentum. Accretion disks can be defined as geometrically thin or geometrically thick. Geometrically thin disks are mostly confined to the black hole's equatorial plane and have a well-defined edge at the innermost stable circular orbit (ISCO), while geometrically thick disks are supported by internal pressure and temperature and can extend inside the ISCO. Disks with high rates of electron scattering and absorption, appearing bright and opaque, are called optically thick; optically thin disks are more translucent and produce fainter images when viewed from afar. Accretion disks of black holes accreting beyond the Eddington limit are often referred to as polish donuts due to their thick, toroidal shape that resembles that of a donut. Quasar accretion disks are expected to usually appear blue in color. The disk for a stellar black hole, on the other hand, would likely look orange, yellow, or red, with its inner regions being the brightest. Theoretical research suggests that the hotter a disk is, the bluer it should be, although this is not always supported by observations of real astronomical objects. Accretion disk colors may also be altered by the Doppler effect, with the part of the disk travelling towards an observer appearing bluer and brighter and the part of the disk travelling away from the observer appearing redder and dimmer. In Newtonian gravity, test particles can stably orbit at arbitrary distances from a central object. In general relativity, however, there exists a smallest possible radius for which a massive particle can orbit stably. Any infinitesimal inward perturbations to this orbit will lead to the particle spiraling into the black hole, and any outward perturbations will, depending on the energy, cause the particle to spiral in, move to a stable orbit further from the black hole, or escape to infinity. This orbit is called the innermost stable circular orbit, or ISCO. The location of the ISCO depends on the spin of the black hole and the spin of the particle itself. In the case of a Schwarzschild black hole (spin zero) and a particle without spin, the location of the ISCO is: r I S C O = 3 r s = 6 G M c 2 , {\displaystyle r_{\rm {ISCO}}=3\,r_{\text{s}}={\frac {6\,GM}{c^{2}}},} where r I S C O {\displaystyle r_{\rm {_{ISCO}}}} is the radius of the ISCO, r s {\displaystyle r_{\text{s}}} is the Schwarzschild radius of the black hole, G {\displaystyle G} is the gravitational constant, and c {\displaystyle c} is the speed of light. The radius of this orbit changes slightly based on particle spin. For charged black holes, the ISCO moves inwards. For spinning black holes, the ISCO is moved inwards for particles orbiting in the same direction that the black hole is spinning (prograde) and outwards for particles orbiting in the opposite direction (retrograde). For example, the ISCO for a particle orbiting retrograde can be as far out as about 9 r s {\displaystyle 9r_{\text{s}}} , while the ISCO for a particle orbiting prograde can be as close as at the event horizon itself. The photon sphere is a spherical boundary for which photons moving on tangents to that sphere are bent completely around the black hole, possibly orbiting multiple times. Light rays with impact parameters less than the radius of the photon sphere enter the black hole. For Schwarzschild black holes, the photon sphere has a radius 1.5 times the Schwarzschild radius; the radius for non-Schwarzschild black holes is at least 1.5 times the radius of the event horizon. When viewed from a great distance, the photon sphere creates an observable black hole shadow. Since no light emerges from within the black hole, this shadow is the limit for possible observations.: 152 The shadow of colliding black holes should have characteristic warped shapes, allowing scientists to detect black holes that are about to merge. While light can still escape from the photon sphere, any light that crosses the photon sphere on an inbound trajectory will be captured by the black hole. Therefore, any light that reaches an outside observer from the photon sphere must have been emitted by objects between the photon sphere and the event horizon. Light emitted towards the photon sphere may also curve around the black hole and return to the emitter. For a rotating, uncharged black hole, the radius of the photon sphere depends on the spin parameter and whether the photon is orbiting prograde or retrograde. For a photon orbiting prograde, the photon sphere will be 1-3 Schwarzschild radii from the center of the black hole, while for a photon orbiting retrograde, the photon sphere will be between 3-5 Schwarzschild radii from the center of the black hole. The exact location of the photon sphere depends on the magnitude of the black hole's rotation. For a charged, nonrotating black hole, there will only be one photon sphere, and the radius of the photon sphere will decrease for increasing black hole charge. For non-extremal, charged, rotating black holes, there will always be two photon spheres, with the exact radii depending on the parameters of the black hole. Near a rotating black hole, spacetime rotates similar to a vortex. The rotating spacetime will drag any matter and light into rotation around the spinning black hole. This effect of general relativity, called frame dragging, gets stronger closer to the spinning mass. The region of spacetime in which it is impossible to stay still is called the ergosphere. The ergosphere of a black hole is a volume bounded by the black hole's event horizon and the ergosurface, which coincides with the event horizon at the poles but bulges out from it around the equator. Matter and radiation can escape from the ergosphere. Through the Penrose process, objects can emerge from the ergosphere with more energy than they entered with. The extra energy is taken from the rotational energy of the black hole, slowing down the rotation of the black hole.: 268 A variation of the Penrose process in the presence of strong magnetic fields, the Blandford–Znajek process, is considered a likely mechanism for the enormous luminosity and relativistic jets of quasars and other active galactic nuclei. The observable region of spacetime around a black hole closest to its event horizon is called the plunging region. In this area it is no longer possible for free falling matter to follow circular orbits or stop a final descent into the black hole. Instead, it will rapidly plunge toward the black hole at close to the speed of light, growing increasingly hot and producing a characteristic, detectable thermal emission. However, light and radiation emitted from this region can still escape from the black hole's gravitational pull. For a nonspinning, uncharged black hole, the radius of the event horizon, or Schwarzschild radius, is proportional to the mass, M, through r s = 2 G M c 2 ≈ 2.95 M M ⊙ k m , {\displaystyle r_{\mathrm {s} }={\frac {2GM}{c^{2}}}\approx 2.95\,{\frac {M}{M_{\odot }}}~\mathrm {km,} } where rs is the Schwarzschild radius and M☉ is the mass of the Sun.: 124 For a black hole with nonzero spin or electric charge, the radius is smaller,[Note 1] until an extremal black hole could have an event horizon close to r + = G M c 2 , {\displaystyle r_{\mathrm {+} }={\frac {GM}{c^{2}}},} half the radius of a nonspinning, uncharged black hole of the same mass. Since the volume within the Schwarzschild radius increase with the cube of the radius, average density of a black hole inside its Schwarzschild radius is inversely proportional to the square of its mass: supermassive black holes are much less dense than stellar black holes. The average density of a 108 M☉ black hole is comparable to that of water. The defining feature of a black hole is the existence of an event horizon, a boundary in spacetime through which matter and light can pass only inward towards the center of the black hole. Nothing, not even light, can escape from inside the event horizon. The event horizon is referred to as such because if an event occurs within the boundary, information from that event cannot reach or affect an outside observer, making it impossible to determine whether such an event occurred.: 179 For non-rotating black holes, the geometry of the event horizon is precisely spherical, while for rotating black holes, the event horizon is oblate. To a distant observer, a clock near a black hole would appear to tick more slowly than one further from the black hole.: 217 This effect, known as gravitational time dilation, would also cause an object falling into a black hole to appear to slow as it approached the event horizon, never quite reaching the horizon from the perspective of an outside observer.: 218 All processes on this object would appear to slow down, and any light emitted by the object to appear redder and dimmer, an effect known as gravitational redshift. An object falling from half of a Schwarzschild radius above the event horizon would fade away until it could no longer be seen, disappearing from view within one hundredth of a second. It would also appear to flatten onto the black hole, joining all other material that had ever fallen into the hole. On the other hand, an observer falling into a black hole would not notice any of these effects as they cross the event horizon. Their own clocks appear to them to tick normally, and they cross the event horizon after a finite time without noting any singular behaviour. In general relativity, it is impossible to determine the location of the event horizon from local observations, due to Einstein's equivalence principle.: 222 Black holes that are rotating and/or charged have an inner horizon, often called the Cauchy horizon, inside of the black hole. The inner horizon is divided up into two segments: an ingoing section and an outgoing section. At the ingoing section of the Cauchy horizon, radiation and matter that fall into the black hole would build up at the horizon, causing the curvature of spacetime to go to infinity. This would cause an observer falling in to experience tidal forces. This phenomenon is often called mass inflation, since it is associated with a parameter dictating the black hole's internal mass growing exponentially, and the buildup of tidal forces is called the mass-inflation singularity or Cauchy horizon singularity. Some physicists have argued that in realistic black holes, accretion and Hawking radiation would stop mass inflation from occurring. At the outgoing section of the inner horizon, infalling radiation would backscatter off of the black hole's spacetime curvature and travel outward, building up at the outgoing Cauchy horizon. This would cause an infalling observer to experience a gravitational shock wave and tidal forces as the spacetime curvature at the horizon grew to infinity. This buildup of tidal forces is called the shock singularity. Both of these singularities are weak, meaning that an object crossing them would only be deformed a finite amount by tidal forces, even though the spacetime curvature would still be infinite at the singularity. This is as opposed to a strong singularity, where an object hitting the singularity would be stretched and squeezed by an infinite amount. They are also null singularities, meaning that a photon could travel parallel to the them without ever being intercepted. Ignoring quantum effects, every black hole has a singularity inside, points where the curvature of spacetime becomes infinite, and geodesics terminate within a finite proper time.: 205 For a non-rotating black hole, this region takes the shape of a single point; for a rotating black hole it is smeared out to form a ring singularity that lies in the plane of rotation.: 264 In both cases, the singular region has zero volume. All of the mass of the black hole ends up in the singularity.: 252 Since the singularity has nonzero mass in an infinitely small space, it can be thought of as having infinite density. Observers falling into a Schwarzschild black hole (i.e., non-rotating and not charged) cannot avoid being carried into the singularity once they cross the event horizon. As they fall further into the black hole, they will be torn apart by the growing tidal forces in a process sometimes referred to as spaghettification or the noodle effect. Eventually, they will reach the singularity and be crushed into an infinitely small point.: 182 However any perturbations, such as those caused by matter or radiation falling in, would cause space to oscillate chaotically near the singularity. Any matter falling in would experience intense tidal forces rapidly changing in direction, all while being compressed into an increasingly small volume. Alternative forms of general relativity, including addition of some quatum effects, can lead to regular, or nonsingular, black holes without singularities. For example, the fuzzball model, based on string theory, states that black holes are actually made up of quantum microstates and need not have a singularity or an event horizon. The theory of loop quantum gravity proposes that the curvature and density at the center of a black hole is large, but not infinite. Formation Black holes are formed by gravitational collapse of massive stars, either by direct collapse or during a supernova explosion in a process called fallback. Black holes can result from the merger of two neutron stars or a neutron star and a black hole. Other more speculative mechanisms include primordial black holes created from density fluctuations in the early universe, the collapse of dark stars, a hypothetical object powered by annihilation of dark matter, or from hypothetical self-interacting dark matter. Gravitational collapse occurs when an object's internal pressure is insufficient to resist the object's own gravity. At the end of a star's life, it will run out of hydrogen to fuse, and will start fusing more and more massive elements, until it gets to iron. Since the fusion of elements heavier than iron would require more energy than it would release, nuclear fusion ceases. If the iron core of the star is too massive, the star will no longer be able to support itself and will undergo gravitational collapse. While most of the energy released during gravitational collapse is emitted very quickly, an outside observer does not actually see the end of this process. Even though the collapse takes a finite amount of time from the reference frame of infalling matter, a distant observer would see the infalling material slow and halt just above the event horizon, due to gravitational time dilation. Light from the collapsing material takes longer and longer to reach the observer, with the delay growing to infinity as the emitting material reaches the event horizon. Thus the external observer never sees the formation of the event horizon; instead, the collapsing material seems to become dimmer and increasingly red-shifted, eventually fading away. Observations of quasars at redshift z ∼ 7 {\displaystyle z\sim 7} , less than a billion years after the Big Bang, has led to investigations of other ways to form black holes. The accretion process to build supermassive black holes has a limiting rate of mass accumulation and a billion years is not enough time to reach quasar status. One suggestion is direct collapse of nearly pure hydrogen gas (low metalicity) clouds characteristic of the young universe, forming a supermassive star which collapses into a black hole. It has been suggested that seed black holes with typical masses of ~105 M☉ could have formed in this way which then could grow to ~109 M☉. However, the very large amount of gas required for direct collapse is not typically stable to fragmentation to form multiple stars. Thus another approach suggests massive star formation followed by collisions that seed massive black holes which ultimately merge to create a quasar.: 85 A neutron star in a common envelope with a regular star can accrete sufficient material to collapse to a black hole or two neutron stars can merge. These avenues for the formation of black holes are considered relatively rare. In the current epoch of the universe, conditions needed to form black holes are rare and are mostly only found in stars. However, in the early universe, conditions may have allowed for black hole formations via other means. Fluctuations of spacetime soon after the Big Bang may have formed areas that were denser then their surroundings. Initially, these regions would not have been compact enough to form a black hole, but eventually, the curvature of spacetime in the regions become large enough to cause them to collapse into a black hole. Different models for the early universe vary widely in their predictions of the scale of these fluctuations. Various models predict the creation of primordial black holes ranging from a Planck mass (~2.2×10−8 kg) to hundreds of thousands of solar masses. Primordial black holes with masses less than 1015 g would have evaporated by now due to Hawking radiation. Despite the early universe being extremely dense, it did not re-collapse into a black hole during the Big Bang, since the universe was expanding rapidly and did not have the gravitational differential necessary for black hole formation. Models for the gravitational collapse of objects of relatively constant size, such as stars, do not necessarily apply in the same way to rapidly expanding space such as the Big Bang. In principle, black holes could be formed in high-energy particle collisions that achieve sufficient density, although no such events have been detected. These hypothetical micro black holes, which could form from the collision of cosmic rays and Earth's atmosphere or in particle accelerators like the Large Hadron Collider, would not be able to aggregate additional mass. Instead, they would evaporate in about 10−25 seconds, posing no threat to the Earth. Evolution Black holes can also merge with other objects such as stars or even other black holes. This is thought to have been important, especially in the early growth of supermassive black holes, which could have formed from the aggregation of many smaller objects. The process has also been proposed as the origin of some intermediate-mass black holes. Mergers of supermassive black holes may take a long time: As a binary of supermassive black holes approach each other, most nearby stars are ejected, leaving little for the remaining black holes to gravitationally interact with that would allow them to get closer to each other. This phenomenon has been called the final parsec problem, as the distance at which this happens is usually around one parsec. When a black hole accretes matter, the gas in the inner accretion disk orbits at very high speeds because of its proximity to the black hole. The resulting friction heats the inner disk to temperatures at which it emits vast amounts of electromagnetic radiation (mainly X-rays) detectable by telescopes. By the time the matter of the disk reaches the ISCO, between 5.7% and 42% of its mass will have been converted to energy, depending on the black hole's spin. About 90% of this energy is released within about 20 black hole radii. In many cases, accretion disks are accompanied by relativistic jets that are emitted along the black hole's poles, which carry away much of the energy. The mechanism for the creation of these jets is currently not well understood, in part due to insufficient data. Many of the universe's most energetic phenomena have been attributed to the accretion of matter on black holes. Active galactic nuclei and quasars are believed to be the accretion disks of supermassive black holes. X-ray binaries are generally accepted to be binary systems in which one of the two objects is a compact object accreting matter from its companion. Ultraluminous X-ray sources may be the accretion disks of intermediate-mass black holes. At a certain rate of accretion, the outward radiation pressure will become as strong as the inward gravitational force, and the black hole should unable to accrete any faster. This limit is called the Eddington limit. However, many black holes accrete beyond this rate due to their non-spherical geometry or instabilities in the accretion disk. Accretion beyond the limit is called Super-Eddington accretion and may have been commonplace in the early universe. Stars have been observed to get torn apart by tidal forces in the immediate vicinity of supermassive black holes in galaxy nuclei, in what is known as a tidal disruption event (TDE). Some of the material from the disrupted star forms an accretion disk around the black hole, which emits observable electromagnetic radiation. The correlation between the masses of supermassive black holes in the centres of galaxies with the velocity dispersion and mass of stars in their host bulges suggests that the formation of galaxies and the formation of their central black holes are related. Black hole winds from rapid accretion, particularly when the galaxy itself is still accreting matter, can compress gas nearby, accelerating star formation. However, if the winds become too strong, the black hole may blow nearly all of the gas out of the galaxy, quenching star formation. Black hole jets may also energize nearby cavities of plasma and eject low-entropy gas from out of the galactic core, causing gas in galactic centers to be hotter than expected. If Hawking's theory of black hole radiation is correct, then black holes are expected to shrink and evaporate over time as they lose mass by the emission of photons and other particles. The temperature of this thermal spectrum (Hawking temperature) is proportional to the surface gravity of the black hole, which is inversely proportional to the mass. Hence, large black holes emit less radiation than small black holes.: Ch. 9.6 A stellar black hole of 1 M☉ has a Hawking temperature of 62 nanokelvins. This is far less than the 2.7 K temperature of the cosmic microwave background radiation. Stellar-mass or larger black holes receive more mass from the cosmic microwave background than they emit through Hawking radiation and thus will grow instead of shrinking. To have a Hawking temperature larger than 2.7 K (and be able to evaporate), a black hole would need a mass less than the Moon. Such a black hole would have a diameter of less than a tenth of a millimetre. The Hawking radiation for an astrophysical black hole is predicted to be very weak and would thus be exceedingly difficult to detect from Earth. A possible exception is the burst of gamma rays emitted in the last stage of the evaporation of primordial black holes. Searches for such flashes have proven unsuccessful and provide stringent limits on the possibility of existence of low mass primordial black holes, with modern research predicting that primordial black holes must make up less than a fraction of 10−7 of the universe's total mass. NASA's Fermi Gamma-ray Space Telescope, launched in 2008, has searched for these flashes, but has not yet found any. The properties of a black hole are constrained and interrelated by the theories that predict these properties. When based on general relativity, these relationships are called the laws of black hole mechanics. For a black hole that is not still forming or accreting matter, the zeroth law of black hole mechanics states the black hole's surface gravity is constant across the event horizon. The first law relates changes in the black hole's surface area, angular momentum, and charge to changes in its energy. The second law says the surface area of a black hole never decreases on its own. Finally, the third law says that the surface gravity of a black hole is never zero. These laws are mathematical analogs of the laws of thermodynamics. They are not equivalent, however, because, according to general relativity without quantum mechanics, a black hole can never emit radiation, and thus its temperature must always be zero.: 11 Quantum mechanics predicts that a black hole will continuously emit thermal Hawking radiation, and therefore must always have a nonzero temperature. It also predicts that all black holes have entropy which scales with their surface area. When quantum mechanics is accounted for, the laws of black hole mechanics become equivalent to the classical laws of thermodynamics. However, these conclusions are derived without a complete theory of quantum gravity, although many potential theories do predict black holes having entropy and temperature. Thus, the true quantum nature of black hole thermodynamics continues to be debated.: 29 Observational evidence Millions of black holes with around 30 solar masses derived from stellar collapse are expected to exist in the Milky Way. Even a dwarf galaxy like Draco should have hundreds. Only a few of these have been detected. By nature, black holes do not themselves emit any electromagnetic radiation other than the hypothetical Hawking radiation, so astrophysicists searching for black holes must generally rely on indirect observations. The defining characteristic of a black hole is its event horizon. The horizon itself cannot be imaged, so all other possible explanations for these indirect observations must be considered and eliminated before concluding that a black hole has been observed.: 11 The Event Horizon Telescope (EHT) is a global system of radio telescopes capable of directly observing a black hole shadow. The angular resolution of a telescope is based on its aperture and the wavelengths it is observing. Because the angular diameters of Sagittarius A* and Messier 87* in the sky are very small, a single telescope would need to be about the size of the Earth to clearly distinguish their horizons using radio wavelengths. By combining data from several different radio telescopes around the world, the Event Horizon Telescope creates an effective aperture the diameter size of the Earth. The EHT team used imaging algorithms to compute the most probable image from the data in its observations of Sagittarius A* and M87*. Gravitational-wave interferometry can be used to detect merging black holes and other compact objects. In this method, a laser beam is split down two long arms of a tunnel. The laser beams reflect off of mirrors in the tunnels and converge at the intersection of the arms, cancelling each other out. However, when a gravitational wave passes, it warps spacetime, changing the lengths of the arms themselves. Since each laser beam is now travelling a slightly different distance, they do not cancel out and produce a recognizable signal. Analysis of the signal can give scientists information about what caused the gravitational waves. Since gravitational waves are very weak, gravitational-wave observatories such as LIGO must have arms several kilometers long and carefully control for noise from Earth to be able to detect these gravitational waves. Since the first measurements in 2016, multiple gravitational waves from black holes have been detected and analyzed. The proper motions of stars near the centre of the Milky Way provide strong observational evidence that these stars are orbiting a supermassive black hole. Since 1995, astronomers have tracked the motions of 90 stars orbiting an invisible object coincident with the radio source Sagittarius A*. In 1998, by fitting the motions of the stars to Keplerian orbits, the astronomers were able to infer that Sagittarius A* must be a 2.6×106 M☉ object must be contained within a radius of 0.02 light-years. Since then, one of the stars—called S2—has completed a full orbit. From the orbital data, astronomers were able to refine the calculations of the mass of Sagittarius A* to 4.3×106 M☉, with a radius of less than 0.002 light-years. This upper limit radius is larger than the Schwarzschild radius for the estimated mass, so the combination does not prove Sagittarius A* is a black hole. Nevertheless, these observations strongly suggest that the central object is a supermassive black hole as there are no other plausible scenarios for confining so much invisible mass into such a small volume. Additionally, there is some observational evidence that this object might possess an event horizon, a feature unique to black holes. The Event Horizon Telescope image of Sagittarius A*, released in 2022, provided further confirmation that it is indeed a black hole. X-ray binaries are binary systems that emit a majority of their radiation in the X-ray part of the electromagnetic spectrum. These X-ray emissions result when a compact object accretes matter from an ordinary star. The presence of an ordinary star in such a system provides an opportunity for studying the central object and to determine if it might be a black hole. By measuring the orbital period of the binary, the distance to the binary from Earth, and the mass of the companion star, scientists can estimate the mass of the compact object. The Tolman-Oppenheimer-Volkoff limit (TOV limit) dictates the largest mass a nonrotating neutron star can be, and is estimated to be about two solar masses. While a rotating neutron star can be slightly more massive, if the compact object is much more massive than the TOV limit, it cannot be a neutron star and is generally expected to be a black hole. The first strong candidate for a black hole, Cygnus X-1, was discovered in this way by Charles Thomas Bolton, Louise Webster, and Paul Murdin in 1972. Observations of rotation broadening of the optical star reported in 1986 lead to a compact object mass estimate of 16 solar masses, with 7 solar masses as the lower bound. In 2011, this estimate was updated to 14.1±1.0 M☉ for the black hole and 19.2±1.9 M☉ for the optical stellar companion. X-ray binaries can be categorized as either low-mass or high-mass; This classification is based on the mass of the companion star, not the compact object itself. In a class of X-ray binaries called soft X-ray transients, the companion star is of relatively low mass, allowing for more accurate estimates of the black hole mass. These systems actively emit X-rays for only several months once every 10–50 years. During the period of low X-ray emission, called quiescence, the accretion disk is extremely faint, allowing detailed observation of the companion star. Numerous black hole candidates have been measured by this method. Black holes are also sometimes found in binaries with other compact objects, such as white dwarfs, neutron stars, and other black holes. The centre of nearly every galaxy contains a supermassive black hole. The close observational correlation between the mass of this hole and the velocity dispersion of the host galaxy's bulge, known as the M–sigma relation, strongly suggests a connection between the formation of the black hole and that of the galaxy itself. Astronomers use the term active galaxy to describe galaxies with unusual characteristics, such as unusual spectral line emission and very strong radio emission. Theoretical and observational studies have shown that the high levels of activity in the centers of these galaxies, regions called active galactic nuclei (AGN), may be explained by accretion onto supermassive black holes. These AGN consist of a central black hole that may be millions or billions of times more massive than the Sun, a disk of interstellar gas and dust called an accretion disk, and two jets perpendicular to the accretion disk. Although supermassive black holes are expected to be found in most AGN, only some galaxies' nuclei have been more carefully studied in attempts to both identify and measure the actual masses of the central supermassive black hole candidates. Some of the most notable galaxies with supermassive black hole candidates include the Andromeda Galaxy, Messier 32, Messier 87, the Sombrero Galaxy, and the Milky Way itself. Another way black holes can be detected is through observation of effects caused by their strong gravitational field. One such effect is gravitational lensing: The deformation of spacetime around a massive object causes light rays to be deflected, making objects behind them appear distorted. When the lensing object is a black hole, this effect can be strong enough to create multiple images of a star or other luminous source. However, the distance between the lensed images may be too small for contemporary telescopes to resolve—this phenomenon is called microlensing. Instead of seeing two images of a lensed star, astronomers see the star brighten slightly as the black hole moves towards the line of sight between the star and Earth and then return to its normal luminosity as the black hole moves away. The turn of the millennium saw the first 3 candidate detections of black holes in this way, and in January 2022, astronomers reported the first confirmed detection of a microlensing event from an isolated black hole. This was also the first determination of an isolated black hole mass, 7.1±1.3 M☉. Alternatives While there is a strong case for supermassive black holes, the model for stellar-mass black holes assumes of an upper limit for the mass of a neutron star: objects observed to have more mass are assumed to be black holes. However, the properties of extremely dense matter are poorly understood. New exotic phases of matter could allow other kinds of massive objects. Quark stars would be made up of quark matter and supported by quark degeneracy pressure, a form of degeneracy pressure even stronger than neutron degeneracy pressure. This would halt gravitational collapse at a higher mass than for a neutron star. Even stronger stars called electroweak stars would convert quarks in their cores into leptons, providing additional pressure to stop the star from collapsing. If, as some extensions of the Standard Model posit, quarks and leptons are made up of the even-smaller fundamental particles called preons, a very compact star could be supported by preon degeneracy pressure. While none of these hypothetical models can explain all of the observations of stellar black hole candidates, a Q star is the only alternative which could significantly exceed the mass limit for neutron stars and thus provide an alternative for supermassive black holes.: 12 A few theoretical objects have been conjectured to match observations of astronomical black hole candidates identically or near-identically, but which function via a different mechanism. A dark energy star would convert infalling matter into vacuum energy; This vacuum energy would be much larger than the vacuum energy of outside space, exerting outwards pressure and preventing a singularity from forming. A black star would be gravitationally collapsing slowly enough that quantum effects would keep it just on the cusp of fully collapsing into a black hole. A gravastar would consist of a very thin shell and a dark-energy interior providing outward pressure to stop the collapse into a black hole or formation of a singularity; It could even have another gravastar inside, called a 'nestar'. Open questions According to the no-hair theorem, a black hole is defined by only three parameters: its mass, charge, and angular momentum. This seems to mean that all other information about the matter that went into forming the black hole is lost, as there is no way to determine anything about the black hole from outside other than those three parameters. When black holes were thought to persist forever, this information loss was not problematic, as the information can be thought of as existing inside the black hole. However, black holes slowly evaporate by emitting Hawking radiation. This radiation does not appear to carry any additional information about the matter that formed the black hole, meaning that this information is seemingly gone forever. This is called the black hole information paradox. Theoretical studies analyzing the paradox have led to both further paradoxes and new ideas about the intersection of quantum mechanics and general relativity. While there is no consensus on the resolution of the paradox, work on the problem is expected to be important for a theory of quantum gravity.: 126 Observations of faraway galaxies have found that ultraluminous quasars, powered by supermassive black holes, existed in the early universe as far as redshift z ≥ 7 {\displaystyle z\geq 7} . These black holes have been assumed to be the products of the gravitational collapse of large population III stars. However, these stellar remnants were not massive enough to produce the quasars observed at early times without accreting beyond the Eddington limit, the theoretical maximum rate of black hole accretion. Physicists have suggested a variety of different mechanisms by which these supermassive black holes may have formed. It has been proposed that smaller black holes may have also undergone mergers to produce the observed supermassive black holes. It is also possible that they were seeded by direct-collapse black holes, in which a large cloud of hot gas avoids fragmentation that would lead to multiple stars, due to low angular momentum or heating from a nearby galaxy. Given the right circumstances, a single supermassive star forms and collapses directly into a black hole without undergoing typical stellar evolution. Additionally, these supermassive black holes in the early universe may be high-mass primordial black holes, which could have accreted further matter in the centers of galaxies. Finally, certain mechanisms allow black holes to grow faster than the theoretical Eddington limit, such as dense gas in the accretion disk limiting outward radiation pressure that prevents the black hole from accreting. However, the formation of bipolar jets prevent super-Eddington rates. In fiction Black holes have been portrayed in science fiction in a variety of ways. Even before the advent of the term itself, objects with characteristics of black holes appeared in stories such as the 1928 novel The Skylark of Space with its "black Sun" and the "hole in space" in the 1935 short story Starship Invincible. As black holes grew to public recognition in the 1960s and 1970s, they began to be featured in films as well as novels, such as Disney's The Black Hole. Black holes have also been used in works of the 21st century, such as Christopher Nolan's science fiction epic Interstellar. Authors and screenwriters have exploited the relativistic effects of black holes, particularly gravitational time dilation. For example, Interstellar features a black hole planet with a time dilation factor of over 60,000:1, while the 1977 novel Gateway depicts a spaceship approaching but never crossing the event horizon of a black hole from the perspective of an outside observer due to time dilation effects. Black holes have also been appropriated as wormholes or other methods of faster-than-light travel, such as in the 1974 novel The Forever War, where a network of black holes is used for interstellar travel. Additionally, black holes can feature as hazards to spacefarers and planets: A black hole threatens a deep-space outpost in 1978 short story The Black Hole Passes, and a binary black hole dangerously alters the orbit of a planet in the 2018 Netflix reboot of Lost in Space. Notes References Further reading External links |
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Contents Extraterrestrial life Extraterrestrial life, or alien life (colloquially aliens), is life that originates from another world rather than on Earth. No extraterrestrial life has yet been scientifically or conclusively detected. Such life might range from simple forms such as prokaryotes to intelligent beings, possibly bringing forth civilizations that might be far more, or far less, advanced than humans. The Drake equation speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as astrobiology. Speculation about inhabited worlds beyond Earth dates back to antiquity. Early Christian writers, including Augustine, discussed ideas from thinkers like Democritus and Epicurus about countless worlds in the vast universe. Pre-modern writers typically assumed extraterrestrial "worlds" were inhabited by living beings. William Vorilong, in the 15th century, acknowledged the possibility Jesus could have visited extraterrestrial worlds to redeem their inhabitants.: 26 In 1440, Nicholas of Cusa suggested Earth is a "brilliant star"; he theorized that all celestial bodies, even the Sun, could host life. Descartes wrote that there were no means to prove the stars were not inhabited by "intelligent creatures", but their existence was a matter of speculation.: 67 In comparison to the life-abundant Earth, the vast majority of intrasolar and extrasolar planets and moons have harsh surface conditions and disparate atmospheric chemistry, or lack an atmosphere. However, there are many extreme and chemically harsh ecosystems on Earth that do support forms of life and are often hypothesized to be the origin of life on Earth. Examples include life surrounding hydrothermal vents, acidic hot springs, and volcanic lakes, as well as halophiles and the deep biosphere. Since the mid-20th century, researchers have searched for extraterrestrial life and intelligence. Solar system studies focus on Venus, Mars, Europa, and Titan, while exoplanet discoveries now total 6,022 confirmed planets in 4,490 systems as of October 2025. Depending on the category of search, methods range from analysis of telescope and specimen data to radios used to detect and transmit interstellar communication. Interstellar travel remains largely hypothetical, with only the Voyager 1 and Voyager 2 probes confirmed to have entered the interstellar medium. The concept of extraterrestrial life, especially intelligent life, has greatly influenced culture and fiction. A key debate centers on contacting extraterrestrial intelligence: some advocate active attempts, while others warn it could be risky, given human history of exploiting other societies. Context Initially, after the Big Bang, the universe was too hot to allow life. It is estimated that the temperature of the universe was around 10 billion Kelvin at the one-second mark. Roughly 15 million years later, it cooled to temperate levels, though the elements of organic life were yet nonexistent. The only freely available elements at that point were hydrogen and helium. Carbon and oxygen (and later, water) would not appear until 50 million years later, created through stellar fusion. At that point, the difficulty for life to appear was not the temperature, but the scarcity of free heavy elements. Planetary systems emerged, and the first organic compounds may have formed in the protoplanetary disk of dust grains that would eventually create rocky planets like Earth. Although Earth was in a molten state after its birth and may have burned any organics that fell on it, it would have been more receptive once it cooled down. Once the right conditions on Earth were met, life started by a chemical process known as abiogenesis. Alternatively, life may have formed less frequently, then spread—by meteoroids, for example—between habitable planets in a process called panspermia. During most of its stellar evolution, stars combine hydrogen nuclei to make helium nuclei by stellar fusion, and the comparatively lighter weight of helium allows the star to release the extra energy. The process continues until the star uses all of its available fuel, with the speed of consumption being related to the size of the star. During its last stages, stars start combining helium nuclei to form carbon nuclei. The larger stars can further combine carbon nuclei to create oxygen and silicon, oxygen into neon and sulfur, and so on until iron. Ultimately, the star blows much of its content back into the stellar medium, where it would join clouds that would eventually become new generations of stars and planets. Many of those materials are the raw components of life on Earth. As this process takes place in all the universe, said materials are ubiquitous in the cosmos and not a rarity from the Solar System. Earth is a planet in the Solar System, a planetary system formed by a star at the center, the Sun, and the objects that orbit it: other planets, moons, asteroids, and comets. The sun is part of the Milky Way, a galaxy. The Milky Way is part of the Local Group, a galaxy group that is in turn part of the Laniakea Supercluster. The universe is composed of all similar structures in existence. The immense distances between celestial objects are a difficulty for studying extraterrestrial life. So far, humans have only set foot on the Moon and sent robotic probes to other planets and moons in the Solar System. Although probes can withstand conditions that may be lethal to humans, the distances cause time delays: the New Horizons took nine years after launch to reach Pluto. No probe has ever reached extrasolar planetary systems. The Voyager 2 left the Solar System at a speed of 50,000 kilometers per hour; if it headed towards the Alpha Centauri system, the closest one to Earth at 4.4 light years, it would reach it in 100,000 years. Under current technology, such systems can only be studied by telescopes, which have limitations. It is estimated that dark matter has a larger amount of combined matter than stars and gas clouds, but as it plays no role in the stellar evolution of stars and planets, it is usually not taken into account by astrobiology. There is an area around a star, the circumstellar habitable zone or "Goldilocks zone", wherein water may be at the right temperature to exist in liquid form at a planetary surface. This area is neither too close to the star, where water would become steam, nor too far away, where water would be frozen as ice. However, although useful as an approximation, planetary habitability is complex and defined by several factors. Being in the habitable zone is not enough for a planet to be habitable, not even to actually have such liquid water. Venus is located in the solar system's habitable zone, but does not have liquid water because of the conditions of its atmosphere. Jovian planets or gas giants are not considered habitable even if they orbit close enough to their stars as hot Jupiters, due to crushing atmospheric pressures. The actual distances for the habitable zones vary according to the type of star, and even the solar activity of each specific star influences the local habitability. The type of star also defines the time the habitable zone will exist, as its presence and limits will change along with the star's stellar evolution. The Big Bang occurred 13.8 billion years ago, the Solar System was formed 4.6 billion years ago, and the first hominids appeared 6 million years ago. Life on other planets may have started, evolved, given birth to extraterrestrial intelligences, and perhaps even faced a planetary extinction event millions or billions of years ago. When considered from a cosmic perspective, the brief times of existence of Earth's species may suggest that extraterrestrial life may be equally fleeting under such a scale. During a period of about 7 million years, from about 10 to 17 million years after the Big Bang, the background temperature was between 373 and 273 K (100 and 0 °C; 212 and 32 °F), allowing the possibility of liquid water if any planets existed. Avi Loeb (2014) speculated that primitive life might in principle have appeared during this window, which he called "the Habitable Epoch of the Early Universe". Life on Earth is quite ubiquitous across the planet and has adapted over time to almost all the available environments in it, extremophiles and the deep biosphere thrive at even the most hostile ones. As a result, it is inferred that life in other celestial bodies may be equally adaptive. However, the origin of life is unrelated to its ease of adaptation and may have stricter requirements. A celestial body may not have any life on it, even if it were habitable. Likelihood of existence Life in the cosmos beyond Earth has been observed. The hypothesis of ubiquitous extraterrestrial life relies on three main ideas. The first one, the size of the universe, allows for plenty of planets to have a similar habitability to Earth, and the age of the universe gives enough time for a long process analog to the history of Earth to happen there. The second is that the substances that make life, such as carbon and water, are ubiquitous in the universe. The third is that the physical laws are universal, which means that the forces that would facilitate or prevent the existence of life would be the same ones as on Earth. According to this argument, made by scientists such as Carl Sagan and Stephen Hawking, it would be improbable for life not to exist somewhere else other than Earth. This argument is embodied in the Copernican principle, which states that Earth does not occupy a unique position in the Universe, and the mediocrity principle, which states that there is nothing special about life on Earth. Other authors consider instead that life in the cosmos, or at least multicellular life, may actually be rare. The Rare Earth hypothesis maintains that life on Earth is possible because of a series of factors that range from the location in the galaxy and the configuration of the Solar System to local characteristics of the planet, and that it is unlikely that another planet simultaneously meets all such requirements. The proponents of this hypothesis consider that very little evidence suggests the existence of extraterrestrial life and that, at this point, it is just a desired result and not a reasonable scientific explanation for any gathered data. In 1961, astronomer and astrophysicist Frank Drake devised the Drake equation as a way to stimulate scientific dialogue at a meeting on the search for extraterrestrial intelligence (SETI). The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. The Drake equation is:: xix where: and Drake's proposed estimates are as follows, but numbers on the right side of the equation are agreed as speculative and open to substitution: 10,000 = 5 ⋅ 0.5 ⋅ 2 ⋅ 1 ⋅ 0.2 ⋅ 1 ⋅ 10,000 {\displaystyle 10{,}000=5\cdot 0.5\cdot 2\cdot 1\cdot 0.2\cdot 1\cdot 10{,}000} [better source needed] The Drake equation has proved controversial since, although it is written as a math equation, none of its values were known at the time. Although some values may eventually be measured, others are based on social sciences and are not knowable by their very nature. This does not allow one to make noteworthy conclusions from the equation. Based on observations from the Hubble Space Telescope, there are nearly 2 trillion galaxies in the observable universe. It is estimated that at least ten percent of all Sun-like stars have a system of planets. In other words, there are 6.25×1018 stars with planets orbiting them in the observable universe. Even if it is assumed that only one out of a billion of these stars has planets supporting life, there would be some 6.25 billion life-supporting planetary systems in the observable universe. A 2013 study based on results from the Kepler spacecraft estimated that the Milky Way contains at least as many planets as it does stars, resulting in 100–400 billion exoplanets. The Nebular hypothesis that explains the formation of the Solar System and other planetary systems would suggest that those can have several configurations, and not all of them may have rocky planets within the habitable zone. The apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilisations and the lack of evidence for such civilisations is known as the Fermi paradox. Dennis W. Sciama claimed that life's existence in the universe depends on various fundamental constants. Zhi-Wei Wang and Samuel L. Braunstein suggest that a random universe capable of supporting life is likely to be just barely able to do so, giving a potential explanation to the Fermi paradox. Biochemical basis If extraterrestrial life exists, it could range from simple microorganisms and multicellular organisms similar to animals or plants, to complex alien intelligences akin to humans. When scientists talk about extraterrestrial life, they consider all those types. Although it is possible that extraterrestrial life may have other configurations, scientists use the hierarchy of lifeforms from Earth for simplicity, as it is the only one known to exist. The first basic requirement for life is an environment with non-equilibrium thermodynamics, which means that the thermodynamic equilibrium must be broken by a source of energy. The traditional sources of energy in the cosmos are the stars, such as for life on Earth, which depends on the energy of the sun. However, there are other alternative energy sources, such as volcanoes, plate tectonics, and hydrothermal vents. There are ecosystems on Earth in deep areas of the ocean that do not receive sunlight, and take energy from black smokers instead. Magnetic fields and radioactivity have also been proposed as sources of energy, although they would be less efficient ones. Life on Earth requires water in a liquid state as a solvent in which biochemical reactions take place. It is highly unlikely that an abiogenesis process can start within a gaseous or solid medium: the atom speeds, either too fast or too slow, make it difficult for specific ones to meet and start chemical reactions. A liquid medium also allows the transport of nutrients and substances required for metabolism. Sufficient quantities of carbon and other elements, along with water, might enable the formation of living organisms on terrestrial planets with a chemical make-up and temperature range similar to that of Earth. Life based on ammonia rather than water has been suggested as an alternative, though this solvent appears less suitable than water. It is also conceivable that there are forms of life whose solvent is a liquid hydrocarbon, such as methane, ethane or propane. Another unknown aspect of potential extraterrestrial life would be the chemical elements that would compose it. Life on Earth is largely composed of carbon, but there could be other hypothetical types of biochemistry. A replacement for carbon would need to be able to create complex molecules, store information required for evolution, and be freely available in the medium. To create DNA, RNA, or a close analog, such an element should be able to bind its atoms with many others, creating complex and stable molecules. It should be able to create at least three covalent bonds: two for making long strings and at least a third to add new links and allow for diverse information. Only nine elements meet this requirement: boron, nitrogen, phosphorus, arsenic, antimony (three bonds), carbon, silicon, germanium and tin (four bonds). As for abundance, carbon, nitrogen, and silicon are the most abundant ones in the universe, far more than the others. On Earth's crust the most abundant of those elements is silicon, in the Hydrosphere it is carbon and in the atmosphere, it is carbon and nitrogen. Silicon, however, has disadvantages over carbon. The molecules formed with silicon atoms are less stable, and more vulnerable to acids, oxygen, and light. An ecosystem of silicon-based lifeforms would require very low temperatures, high atmospheric pressure, an atmosphere devoid of oxygen, and a solvent other than water. The low temperatures required would add an extra problem, the difficulty to kickstart a process of abiogenesis to create life in the first place. Norman Horowitz, head of the Jet Propulsion Laboratory bioscience section for the Mariner and Viking missions from 1965 to 1976 considered that the great versatility of the carbon atom makes it the element most likely to provide solutions, even exotic solutions, to the problems of survival of life on other planets. However, he also considered that the conditions found on Mars were incompatible with carbon based life. Even if extraterrestrial life is based on carbon and uses water as a solvent, like Earth life, it may still have a radically different biochemistry. Life is generally considered to be a product of natural selection. It has been proposed that to undergo natural selection a living entity must have the capacity to replicate itself, the capacity to avoid damage/decay, and the capacity to acquire and process resources in support of the first two capacities. Life on Earth may have started with an RNA world and later evolved to its current form, where some of the RNA tasks were transferred to DNA and proteins. Extraterrestrial life may still be stuck using RNA, or evolve into other configurations. It is unclear if our biochemistry is the most efficient one that could be generated, or which elements would follow a similar pattern. However, it is likely that, even if cells had a different composition to those from Earth, they would still have a cell membrane. Life on Earth jumped from prokaryotes to eukaryotes and from unicellular organisms to multicellular organisms through evolution. So far no alternative process to achieve such a result has been conceived, even if hypothetical. Evolution requires life to be divided into individual organisms, and no alternative organisation has been satisfactorily proposed either. At the basic level, membranes define the limit of a cell, between it and its environment, while remaining partially open to exchange energy and resources with it. The evolution from simple cells to eukaryotes, and from them to multicellular lifeforms, is not guaranteed. The Cambrian explosion took place thousands of millions of years after the origin of life, and its causes are not fully known yet. On the other hand, the jump to multicellularity took place several times, which suggests that it could be a case of convergent evolution, and so likely to take place on other planets as well. Palaeontologist Simon Conway Morris considers that convergent evolution would lead to kingdoms similar to our plants and animals, and that many features are likely to develop in alien animals as well, such as bilateral symmetry, limbs, digestive systems and heads with sensory organs. Scientists from the University of Oxford analysed it from the perspective of evolutionary theory and wrote in a study in the International Journal of Astrobiology that aliens may be similar to humans. The planetary context would also have an influence: a planet with higher gravity would have smaller animals, and other types of stars can lead to non-green photosynthesizers. The amount of energy available would also affect biodiversity, as an ecosystem sustained by black smokers or hydrothermal vents would have less energy available than those sustained by a star's light and heat, and so its lifeforms would not grow beyond a certain complexity. There is also research in assessing the capacity of life for developing intelligence. It has been suggested that this capacity arises with the number of potential niches a planet contains, and that the complexity of life itself is reflected in the information density of planetary environments, which in turn can be computed from its niches. It is common knowledge that the conditions on other planets in the solar system, in addition to the many galaxies outside of the Milky Way galaxy, are very harsh and seem to be too extreme to harbor any life. The environmental conditions on these planets can have intense UV radiation paired with extreme temperatures, lack of water, and much more that can lead to conditions that don't seem to favor the creation or maintenance of extraterrestrial life. However, there has been much historical evidence that some of the earliest and most basic forms of life on Earth originated in some extreme environments that seem unlikely to have harbored life at least at one point in Earth's history. Fossil evidence as well as many historical theories backed up by years of research and studies have marked environments like hydrothermal vents or acidic hot springs as some of the first places that life could have originated on Earth. These environments can be considered extreme when compared to the typical ecosystems that the majority of life on Earth now inhabit, as hydrothermal vents are scorching hot due to the magma escaping from the Earth's mantle and meeting the much colder oceanic water. Even in today's world, there can be a diverse population of bacteria found inhabiting the area surrounding these hydrothermal vents which can suggest that some form of life can be supported even in the harshest of environments like the other planets in the solar system. The aspects of these harsh environments that make them ideal for the origin of life on Earth, as well as the possibility of creation of life on other planets, is the chemical reactions forming spontaneously. For example, the hydrothermal vents found on the ocean floor are known to support many chemosynthetic processes which allow organisms to utilize energy through reduced chemical compounds that fix carbon. In return, these reactions will allow for organisms to live in relatively low oxygenated environments while maintaining enough energy to support themselves. The early Earth environment was reducing and therefore, these carbon fixing compounds were necessary for the survival and possible origin of life on Earth. With the little amount of information that scientists have found regarding the atmosphere on other planets in the Milky Way galaxy and beyond, the atmospheres are most likely reducing or with very low oxygen levels, especially when compared with Earth's atmosphere. If there were the necessary elements and ions on these planets, the same carbon fixing, reduced chemical compounds occurring around hydrothermal vents could also occur on these planets' surfaces and possibly result in the origin of extraterrestrial life. Planetary habitability in the Solar System The Solar System has a wide variety of planets, dwarf planets, and moons, and each one is studied for its potential to host life. Each one has its own specific conditions that may benefit or harm life. So far, the only lifeforms found are those from Earth. No extraterrestrial intelligence other than humans exists or has ever existed within the Solar System. Astrobiologist Mary Voytek points out that it would be unlikely to find large ecosystems, as they would have already been detected by now. The inner Solar System is likely devoid of life. However, Venus is still of interest to astrobiologists, as it is a terrestrial planet that was likely similar to Earth in its early stages and developed in a different way. There is a greenhouse effect, the surface is the hottest in the Solar System, sulfuric acid clouds, all surface liquid water is lost, and it has a thick carbon-dioxide atmosphere with huge pressure. Comparing both helps to understand the precise differences that lead to beneficial or harmful conditions for life. And despite the conditions against life on Venus, there are suspicions that microbial life-forms may still survive in high-altitude clouds. Mars is a cold and almost airless desert, inhospitable to life. However, recent studies revealed that water on Mars used to be quite abundant, forming rivers, lakes, and perhaps even oceans. Mars may have been habitable back then, and life on Mars may have been possible. But when the planetary core ceased to generate a magnetic field, solar winds removed the atmosphere and the planet became vulnerable to solar radiation. Ancient life-forms may still have left fossilised remains, and microbes may still survive deep underground. As mentioned, the gas giants and ice giants are unlikely to contain life. The most distant solar system bodies, found in the Kuiper Belt and outwards, are locked in permanent deep-freeze, but cannot be ruled out completely. Although the giant planets themselves are highly unlikely to have life, there is much hope to find it on moons orbiting these planets. Europa, from the Jovian system, has a subsurface ocean below a thick layer of ice. Ganymede and Callisto also have subsurface oceans, but life is less likely in them because water is sandwiched between layers of solid ice. Europa would have contact between the ocean and the rocky surface, which helps the chemical reactions. It may be difficult to dig so deep in order to study those oceans, though. Enceladus, a tiny moon of Saturn with another subsurface ocean, may not need to be dug, as it releases water to space in eruption columns. The space probe Cassini flew inside one of these, but could not make a full study because NASA did not expect this phenomenon and did not equip the probe to study ocean water. Still, Cassini detected complex organic molecules, salts, evidence of hydrothermal activity, hydrogen, and methane. Titan is the only celestial body in the Solar System besides Earth that has liquid bodies on the surface. It has rivers, lakes, and rain of hydrocarbons, methane, and ethane, and even a cycle similar to Earth's water cycle. This special context encourages speculations about lifeforms with different biochemistry, but the cold temperatures would make such chemistry take place at a very slow pace. Water is rock-solid on the surface, but Titan does have a subsurface water ocean like several other moons. However, it is of such a great depth that it would be very difficult to access it for study. Scientific search The science that searches and studies life in the universe, both on Earth and elsewhere, is called astrobiology. With the study of Earth's life, the only known form of life, astrobiology seeks to study how life starts and evolves and the requirements for its continuous existence. This helps to determine what to look for when searching for life in other celestial bodies. This is a complex area of study, and uses the combined perspectives of several scientific disciplines, such as astronomy, biology, chemistry, geology, oceanography, and atmospheric sciences. The scientific search for extraterrestrial life is being carried out both directly and indirectly. As of September 2017[update], 3,667 exoplanets in 2,747 systems have been identified, and other planets and moons in the Solar System hold the potential for hosting primitive life such as microorganisms. As of 8 February 2021, an updated status of studies considering the possible detection of lifeforms on Venus (via phosphine) and Mars (via methane) was reported. Scientists search for biosignatures within the Solar System by studying planetary surfaces and examining meteorites. Some claim to have identified evidence that microbial life has existed on Mars. In 1996, a controversial report stated that structures resembling nanobacteria were discovered in a meteorite, ALH84001, formed of rock ejected from Mars. Although all the unusual properties of the meteorite were eventually explained as the result of inorganic processes, the controversy over its discovery laid the groundwork for the development of astrobiology. An experiment on the two Viking Mars landers reported gas emissions from heated Martian soil samples that some scientists argue are consistent with the presence of living microorganisms. Lack of corroborating evidence from other experiments on the same samples suggests that a non-biological reaction is a more likely hypothesis. In February 2005 NASA scientists reported they may have found some evidence of extraterrestrial life on Mars. The two scientists, Carol Stoker and Larry Lemke of NASA's Ames Research Center, based their claim on methane signatures found in Mars's atmosphere resembling the methane production of some forms of primitive life on Earth, as well as on their own study of primitive life near the Rio Tinto river in Spain. NASA officials soon distanced NASA from the scientists' claims, and Stoker herself backed off from her initial assertions. In November 2011, NASA launched the Mars Science Laboratory that landed the Curiosity rover on Mars. It is designed to assess the past and present habitability on Mars using a variety of scientific instruments. The rover landed on Mars at Gale Crater in August 2012. A group of scientists at Cornell University started a catalog of microorganisms, with the way each one reacts to sunlight. The goal is to help with the search for similar organisms in exoplanets, as the starlight reflected by planets rich in such organisms would have a specific spectrum, unlike that of starlight reflected from lifeless planets. If Earth was studied from afar with this system, it would reveal a shade of green, as a result of the abundance of plants with photosynthesis. In August 2011, NASA studied meteorites found on Antarctica, finding adenine, guanine, hypoxanthine, and xanthine. Adenine and guanine are components of DNA, and the others are used in other biological processes. The studies ruled out pollution of the meteorites on Earth, as those components would not be freely available the way they were found in the samples. This discovery suggests that several organic molecules that serve as building blocks of life may be generated within asteroids and comets. In October 2011, scientists reported that cosmic dust contains complex organic compounds ("amorphous organic solids with a mixed aromatic-aliphatic structure") that could be created naturally, and rapidly, by stars. It is still unclear if those compounds played a role in the creation of life on Earth, but Sun Kwok, of the University of Hong Kong, thinks so. "If this is the case, life on Earth may have had an easier time getting started as these organics can serve as basic ingredients for life." In August 2012, and in a world first, astronomers at Copenhagen University reported the detection of a specific sugar molecule, glycolaldehyde, in a distant star system. The molecule was found around the protostellar binary IRAS 16293-2422, which is located 400 light years from Earth. Glycolaldehyde is needed to form ribonucleic acid, or RNA, which is similar in function to DNA. This finding suggests that complex organic molecules may form in stellar systems prior to the formation of planets, eventually arriving on young planets early in their formation. In December 2023, astronomers reported the first time discovery, in the plumes of Enceladus, moon of the planet Saturn, of hydrogen cyanide, a possible chemical essential for life as we know it, as well as other organic molecules, some of which are yet to be better identified and understood. According to the researchers, "these [newly discovered] compounds could potentially support extant microbial communities or drive complex organic synthesis leading to the origin of life." Although most searches are focused on the biology of extraterrestrial life, an extraterrestrial intelligence capable enough to develop a civilization may be detectable by other means as well. Technology may generate technosignatures, effects on the native planet that may not be caused by natural causes. There are three main types of techno-signatures considered: interstellar communications, effects on the atmosphere, and planetary-sized structures such as Dyson spheres. Organizations such as the SETI Institute search the cosmos for potential forms of communication. They started with radio waves, and now search for laser pulses as well. The challenge for this search is that there are natural sources of such signals as well, such as gamma-ray bursts and supernovae, and the difference between a natural signal and an artificial one would be in its specific patterns. Astronomers intend to use artificial intelligence for this, as it can manage large amounts of data and is devoid of biases and preconceptions. Besides, even if there is an advanced extraterrestrial civilization, there is no guarantee that it is transmitting radio communications in the direction of Earth. The length of time required for a signal to travel across space means that a potential answer may arrive decades or centuries after the initial message. The atmosphere of Earth is rich in nitrogen dioxide as a result of air pollution, which can be detectable. The natural abundance of carbon, which is also relatively reactive, makes it likely to be a basic component of the development of a potential extraterrestrial technological civilization, as it is on Earth. Fossil fuels may likely be generated and used on such worlds as well. The abundance of chlorofluorocarbons in the atmosphere can also be a clear technosignature, considering their role in ozone depletion. Light pollution may be another technosignature, as multiple lights on the night side of a rocky planet can be a sign of advanced technological development. However, modern telescopes are not strong enough to study exoplanets with the required level of detail to perceive it. The Kardashev scale proposes that a civilization may eventually start consuming energy directly from its local star. This would require giant structures built next to it, called Dyson spheres. Those speculative structures would cause an excess infrared radiation, that telescopes may notice. The infrared radiation is typical of young stars, surrounded by dusty protoplanetary disks that will eventually form planets. An older star such as the Sun would have no natural reason to have excess infrared radiation. The presence of heavy elements in a star's light-spectrum is another potential biosignature; such elements would (in theory) be found if the star were being used as an incinerator/repository for nuclear waste products. Some astronomers search for extrasolar planets that may be conducive to life, narrowing the search to terrestrial planets within the habitable zones of their stars. Since 1992, over four thousand exoplanets have been discovered (6,128 planets in 4,584 planetary systems including 1,017 multiple planetary systems as of 30 October 2025). The extrasolar planets so far discovered range in size from that of terrestrial planets similar to Earth's size to that of gas giants larger than Jupiter. The number of observed exoplanets is expected to increase greatly in the coming years.[better source needed] The Kepler space telescope has also detected a few thousand candidate planets, of which about 11% may be false positives. There is at least one planet on average per star. About 1 in 5 Sun-like stars[a] have an "Earth-sized"[b] planet in the habitable zone,[c] with the nearest expected to be within 12 light-years distance from Earth. Assuming 200 billion stars in the Milky Way,[d] that would be 11 billion potentially habitable Earth-sized planets in the Milky Way, rising to 40 billion if red dwarfs are included. The rogue planets in the Milky Way possibly number in the trillions. The nearest known exoplanet is Proxima Centauri b, located 4.2 light-years (1.3 pc) from Earth in the southern constellation of Centaurus. As of March 2014[update], the least massive exoplanet known is PSR B1257+12 A, which is about twice the mass of the Moon. The most massive planet listed on the NASA Exoplanet Archive is DENIS-P J082303.1−491201 b, about 29 times the mass of Jupiter, although according to most definitions of a planet, it is too massive to be a planet and may be a brown dwarf instead. Almost all of the planets detected so far are within the Milky Way, but there have also been a few possible detections of extragalactic planets. The study of planetary habitability also considers a wide range of other factors in determining the suitability of a planet for hosting life. One sign that a planet probably already contains life is the presence of an atmosphere with significant amounts of oxygen, since that gas is highly reactive and generally would not last long without constant replenishment. This replenishment occurs on Earth through photosynthetic organisms. One way to analyse the atmosphere of an exoplanet is through spectrography when it transits its star, though this might only be feasible with dim stars like white dwarfs. History and cultural impact The modern concept of extraterrestrial life is based on assumptions that were not commonplace during the early days of astronomy. The first explanations for the celestial objects seen in the night sky were based on mythology. Scholars from Ancient Greece were the first to consider that the universe is inherently understandable and rejected explanations based on supernatural incomprehensible forces, such as the myth of the Sun being pulled across the sky in the chariot of Apollo. They had not developed the scientific method yet and based their ideas on pure thought and speculation, but they developed precursor ideas to it, such as that explanations had to be discarded if they contradict observable facts. The discussions of those Greek scholars established many of the pillars that would eventually lead to the idea of extraterrestrial life, such as Earth being round and not flat. The cosmos was first structured in a geocentric model that considered that the sun and all other celestial bodies revolve around Earth. However, they did not consider them as worlds. In Greek understanding, the world was composed by both Earth and the celestial objects with noticeable movements. Anaximander thought that the cosmos was made from apeiron, a substance that created the world, and that the world would eventually return to the cosmos. Eventually two groups emerged, the atomists that thought that matter at both Earth and the cosmos was equally made of small atoms of the classical elements (earth, water, fire and air), and the Aristotelians who thought that those elements were exclusive of Earth and that the cosmos was made of a fifth one, the aether. Atomist Epicurus thought that the processes that created the world, its animals and plants should have created other worlds elsewhere, along with their own animals and plants. Aristotle thought instead that all the earth element naturally fell towards the center of the universe, and that would make it impossible for other planets to exist elsewhere. Under that reasoning, Earth was not only in the center, it was also the only planet in the universe. Cosmic pluralism, the plurality of worlds, or simply pluralism, describes the philosophical belief in numerous "worlds" in addition to Earth, which might harbor extraterrestrial life. The earliest recorded assertion of extraterrestrial human life is found in ancient scriptures of Jainism. There are multiple "worlds" mentioned in Jain scriptures that support human life. These include, among others, Bharat Kshetra, Mahavideh Kshetra, Airavat Kshetra, and Hari kshetra. Medieval Muslim writers like Fakhr al-Din al-Razi and Muhammad al-Baqir supported cosmic pluralism on the basis of the Qur'an. Chaucer's poem The House of Fame engaged in medieval thought experiments that postulated the plurality of worlds. However, those ideas about other worlds were different from the current knowledge about the structure of the universe, and did not postulate the existence of planetary systems other than the Solar System. When those authors talk about other worlds, they talk about places located at the center of their own systems, and with their own stellar vaults and cosmos surrounding them. The Greek ideas and the disputes between atomists and Aristotelians outlived the fall of the Greek empire. The Great Library of Alexandria compiled information about it, part of which was translated by Islamic scholars and thus survived the end of the Library. Baghdad combined the knowledge of the Greeks, the Indians, the Chinese and its own scholars, and the knowledge expanded through the Byzantine Empire. From there it eventually returned to Europe by the time of the Middle Ages. However, as the Greek atomist doctrine held that the world was created by random movements of atoms, with no need for a creator deity, it became associated with atheism, and the dispute intertwined with religious ones. Still, the Church did not react to those topics in a homogeneous way, and there were stricter and more permissive views within the church itself. The first known mention of the term 'panspermia' was in the writings of the 5th-century BC Greek philosopher Anaxagoras. He proposed the idea that life exists everywhere. By the time of the late Middle Ages there were many known inaccuracies in the geocentric model, but it was kept in use because naked eye observations provided limited data. Nicolaus Copernicus started the Copernican Revolution by proposing that the planets revolve around the sun rather than Earth. His proposal had little acceptance at first because, as he kept the assumption that orbits were perfect circles, his model led to as many inaccuracies as the geocentric one. Tycho Brahe improved the available data with naked-eye observatories, which worked with highly complex sextants and quadrants. Tycho could not make sense of his observations, but Johannes Kepler did: orbits were not perfect circles, but ellipses. This knowledge benefited the Copernican model, which worked now almost perfectly. The invention of the telescope a short time later, perfected by Galileo Galilei, clarified the final doubts, and the paradigm shift was completed. Under this new understanding, the notion of extraterrestrial life became feasible: if Earth is but just a planet orbiting around a star, there may be planets similar to Earth elsewhere. The astronomical study of distant bodies also proved that physical laws are the same elsewhere in the universe as on Earth, with nothing making the planet truly special. The new ideas were met with resistance from the Catholic church. Galileo was tried for the heliocentric model, which was considered heretical, and forced to recant it. The best-known early-modern proponent of ideas of extraterrestrial life was the Italian philosopher Giordano Bruno, who argued in the 16th century for an infinite universe in which every star is surrounded by its own planetary system. Bruno wrote that other worlds "have no less virtue nor a nature different to that of our earth" and, like Earth, "contain animals and inhabitants". Bruno's belief in the plurality of worlds was one of the charges leveled against him by the Venetian Holy Inquisition, which tried and executed him. The heliocentric model was further strengthened by the postulation of the theory of gravity by Sir Isaac Newton. This theory provided the mathematics that explains the motions of all things in the universe, including planetary orbits. By this point, the geocentric model was definitely discarded. By this time, the use of the scientific method had become a standard, and new discoveries were expected to provide evidence and rigorous mathematical explanations. Science also took a deeper interest in the mechanics of natural phenomena, trying to explain not just the way nature works but also the reasons for working that way. There was very little actual discussion about extraterrestrial life before this point, as the Aristotelian ideas remained influential while geocentrism was still accepted. When it was finally proved wrong, it not only meant that Earth was not the center of the universe, but also that the lights seen in the sky were not just lights, but physical objects. The notion that life may exist in them as well soon became an ongoing topic of discussion, although one with no practical ways to investigate. The possibility of extraterrestrials remained a widespread speculation as scientific discovery accelerated. William Herschel, the discoverer of Uranus, was one of many 18th–19th-century astronomers who believed that the Solar System is populated by alien life. Other scholars of the period who championed "cosmic pluralism" included Immanuel Kant and Benjamin Franklin. At the height of the Enlightenment, even the Sun and Moon were considered candidates for extraterrestrial inhabitants. Speculation about life on Mars increased in the late 19th century, following telescopic observation of apparent Martian canals – which soon, however, turned out to be optical illusions. Despite this, in 1895, American astronomer Percival Lowell published his book Mars, followed by Mars and its Canals in 1906, proposing that the canals were the work of a long-gone civilisation. Spectroscopic analysis of Mars's atmosphere began in earnest in 1894, when U.S. astronomer William Wallace Campbell showed that neither water nor oxygen was present in the Martian atmosphere. By 1909 better telescopes and the best perihelic opposition of Mars since 1877 conclusively put an end to the canal hypothesis. As a consequence of the belief in the spontaneous generation there was little thought about the conditions of each celestial body: it was simply assumed that life would thrive anywhere. This theory was disproved by Louis Pasteur in the 19th century. Popular belief in thriving alien civilisations elsewhere in the solar system still remained strong until Mariner 4 and Mariner 9 provided close images of Mars, which debunked forever the idea of the existence of Martians and decreased the previous expectations of finding alien life in general. The end of the spontaneous generation belief forced investigation into the origin of life. Although abiogenesis is the more accepted theory, a number of authors reclaimed the term "panspermia" and proposed that life was brought to Earth from elsewhere. Some of those authors are Jöns Jacob Berzelius (1834), Kelvin (1871), Hermann von Helmholtz (1879) and, somewhat later, by Svante Arrhenius (1903). The science fiction genre, although not so named during the time, developed during the late 19th century. The expansion of the genre of extraterrestrials in fiction influenced the popular perception over the real-life topic, making people eager to jump to conclusions about the discovery of aliens. Science marched at a slower pace, some discoveries fueled expectations and others dashed excessive hopes. For example, with the advent of telescopes, most structures seen on the Moon or Mars were immediately attributed to Selenites or Martians, and later ones (such as more powerful telescopes) revealed that all such discoveries were natural features. A famous case is the Cydonia region of Mars, first imaged by the Viking 1 orbiter. The low-resolution photos showed a rock formation that resembled a human face, but later spacecraft took photos in higher detail that showed that there was nothing special about the site. The search and study of extraterrestrial life became a science of its own, astrobiology. Also known as exobiology, this discipline is studied by the NASA, the ESA, the INAF, and others. Astrobiology studies life from Earth as well, but with a cosmic perspective. For example, abiogenesis is of interest to astrobiology, not because of the origin of life on Earth, but for the chances of a similar process taking place in other celestial bodies. Many aspects of life, from its definition to its chemistry, are analyzed as either likely to be similar in all forms of life across the cosmos or only native to Earth. Astrobiology, however, remains constrained by the current lack of extraterrestrial life-forms to study, as all life on Earth comes from the same ancestor, and it is hard to infer general characteristics from a group with a single example to analyse. The 20th century came with great technological advances, speculations about future hypothetical technologies, and an increased basic knowledge of science by the general population thanks to science divulgation through the mass media. The public interest in extraterrestrial life and the lack of discoveries by mainstream science led to the emergence of pseudosciences that provided affirmative, if questionable, answers to the existence of aliens. Ufology claims that many unidentified flying objects (UFOs) would be spaceships from alien species, and ancient astronauts hypothesis claim that aliens would have visited Earth in antiquity and prehistoric times but people would have failed to understand it by then. Most UFOs or UFO sightings can be readily explained as sightings of Earth-based aircraft (including top-secret aircraft), known astronomical objects or weather phenomenons, or as hoaxes. Looking beyond the pseudosciences, Lewis White Beck strove to elevate the level of public discourse on the topic of extraterrestrial life by tracing the evolution of philosophical thought over the centuries from ancient times into the modern era. His review of the contributions made by Lucretius, Plutarch, Aristotle, Copernicus, Immanuel Kant, John Wilkins, Charles Darwin and Karl Marx demonstrated that even in modern times, humanity could be profoundly influenced in its search for extraterrestrial life by subtle and comforting archetypal ideas which are largely derived from firmly held religious, philosophical and existential belief systems. On a positive note, however, Beck further argued that even if the search for extraterrestrial life proves to be unsuccessful, the endeavor itself could have beneficial consequences by assisting humanity in its attempt to actualize superior ways of living here on Earth. By the 21st century, it was accepted that multicellular life in the Solar System can only exist on Earth, but the interest in extraterrestrial life increased regardless. This is a result of the advances in several sciences. The knowledge of planetary habitability allows to consider on scientific terms the likelihood of finding life at each specific celestial body, as it is known which features are beneficial and harmful for life. Astronomy and telescopes also improved to the point exoplanets can be confirmed and even studied, increasing the number of search places. Life may still exist elsewhere in the Solar System in unicellular form, but the advances in spacecraft allow to send robots to study samples in situ, with tools of growing complexity and reliability. Although no extraterrestrial life has been found and life may still be just a rarity from Earth, there are scientific reasons to suspect that it can exist elsewhere, and technological advances that may detect it if it does. Many scientists are optimistic about the chances of finding alien life. In the words of SETI's Frank Drake, "All we know for sure is that the sky is not littered with powerful microwave transmitters". Drake noted that it is entirely possible that advanced technology results in communication being carried out in some way other than conventional radio transmission. At the same time, the data returned by space probes, and giant strides in detection methods, have allowed science to begin delineating habitability criteria on other worlds, and to confirm that at least other planets are plentiful, though aliens remain a question mark. The Wow! signal, detected in 1977 by a SETI project, remains a subject of speculative debate. On the other hand, other scientists are pessimistic. Jacques Monod wrote that "Man knows at last that he is alone in the indifferent immensity of the universe, whence which he has emerged by chance". In 2000, geologist and paleontologist Peter Ward and astrobiologist Donald Brownlee published a book entitled Rare Earth: Why Complex Life is Uncommon in the Universe.[better source needed] In it, they discussed the Rare Earth hypothesis, in which they claim that Earth-like life is rare in the universe, whereas microbial life is common. Ward and Brownlee are open to the idea of evolution on other planets that is not based on essential Earth-like characteristics such as DNA and carbon. As for the possible risks, theoretical physicist Stephen Hawking warned in 2010 that humans should not try to contact alien life forms. He warned that aliens might pillage Earth for resources. "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans", he said. Jared Diamond had earlier expressed similar concerns. On 20 July 2015, Hawking and Russian billionaire Yuri Milner, along with the SETI Institute, announced a well-funded effort, called the Breakthrough Initiatives, to expand efforts to search for extraterrestrial life. The group contracted the services of the 100-meter Robert C. Byrd Green Bank Telescope in West Virginia in the United States and the 64-meter Parkes Telescope in New South Wales, Australia. On 13 February 2015, scientists (including Geoffrey Marcy, Seth Shostak, Frank Drake and David Brin) at a convention of the American Association for the Advancement of Science, discussed Active SETI and whether transmitting a message to possible intelligent extraterrestrials in the Cosmos was a good idea; one result was a statement, signed by many, that a "worldwide scientific, political and humanitarian discussion must occur before any message is sent". Government responses The 1967 Outer Space Treaty and the 1979 Moon Agreement define rules of planetary protection against potentially hazardous extraterrestrial life. COSPAR also provides guidelines for planetary protection. A committee of the United Nations Office for Outer Space Affairs had in 1977 discussed for a year strategies for interacting with extraterrestrial life or intelligence. The discussion ended without any conclusions. As of 2010, the UN lacks response mechanisms for the case of an extraterrestrial contact. One of the NASA divisions is the Office of Safety and Mission Assurance (OSMA), also known as the Planetary Protection Office. A part of its mission is to "rigorously preclude backward contamination of Earth by extraterrestrial life." In 2016, the Chinese Government released a white paper detailing its space program. According to the document, one of the research objectives of the program is the search for extraterrestrial life. It is also one of the objectives of the Chinese Five-hundred-meter Aperture Spherical Telescope (FAST) program. In 2020, Dmitry Rogozin, the head of the Russian space agency, said the search for extraterrestrial life is one of the main goals of deep space research. He also acknowledged the possibility of existence of primitive life on other planets of the Solar System. The French space agency has an office for the study of "non-identified aero spatial phenomena". The agency is maintaining a publicly accessible database of such phenomena, with over 1600 detailed entries. According to the head of the office, the vast majority of entries have a mundane explanation; but for 25% of entries, their extraterrestrial origin can neither be confirmed nor denied. In 2020, chairman of the Israel Space Agency Isaac Ben-Israel stated that the probability of detecting life in outer space is "quite large". But he disagrees with his former colleague Haim Eshed who stated that there are contacts between an advanced alien civilisation and some of Earth's governments. In fiction Although the idea of extraterrestrial peoples became feasible once astronomy developed enough to understand the nature of planets, they were not thought of as being any different from humans. Having no scientific explanation for the origin of mankind and its relation to other species, there was no reason to expect them to be any other way. This was changed by the 1859 book On the Origin of Species by Charles Darwin, which proposed the theory of evolution. Now with the notion that evolution on other planets may take other directions, science fiction authors created bizarre aliens, clearly distinct from humans. A usual way to do that was to add body features from other animals, such as insects or octopuses. Costuming and special effects feasibility alongside budget considerations forced films and TV series to tone down the fantasy, but these limitations lessened since the 1990s with the advent of computer-generated imagery (CGI), and later on as CGI became more effective and less expensive. Real-life events sometimes captivate people's imagination and this influences the works of fiction. For example, during the Barney and Betty Hill incident, the first recorded claim of an alien abduction, the couple reported that they were abducted and experimented on by aliens with oversized heads, big eyes, pale grey skin, and small noses, a description that eventually became the grey alien archetype once used in works of fiction. See also Notes References Further reading External links |
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Contents Masters of the Universe Masters of the Universe (sometimes referred to as the He-Man or She-Ra series) is a sword and planet-themed media franchise created by Mattel. The main premise revolves around the conflict between He-Man (the alter ego of Prince Adam) and Skeletor on the planet Eternia, with a vast lineup of supporting characters in a hybrid setting of medieval sword and sorcery, and sci-fi technology. A follow-up series, She-Ra: Princess of Power revolves around He-Man's sister She-Ra and her rebellion against The Horde on the planet Etheria. Since its initial launch, the franchise has spawned a variety of products, including multiple lines of action figures, seven animated television series, several comic series, video games, books and magazines, a daily newspaper comic strip, and three feature films. Series overview and main characters He-Man and the accompanying Masters of the Universe franchise would make their debut in 1982 with Mattel's release of the original "Masters of the Universe" 5.5-inch action-figure toy line. Masters of the Universe, often abbreviated as MOTU, would begin its mythos through the minicomics that accompanied the toys throughout the 1980s. These initial mini comics were soon followed by several children's books and issues of DC Comics. However, the Masters of the Universe franchise would become best known through Filmation's groundbreaking He-Man and the Masters of the Universe animated series. Debuting in the fall of 1983, the Filmation series ran 130 episodes over two seasons until November 1985. Since its inception, Masters of the Universe has usually placed its focus on the two primary characters, the blond muscular He-Man, "the most powerful man in the Universe," and his nemesis, the evil skull-faced, blue-skinned sorcerer Skeletor and their many moral-themed encounters on the planet Eternia. Set in a hybrid world of sword and sorcery and technological sci-fi, He-Man battles with Skeletor to prevent him from conquering Eternia and discovering the secrets of Castle Grayskull—a mysterious ancient fortress with a skull-shaped facade, containing great power and magic. As with many toy franchises that have been transferred to several different media, there are a number of story differences between the various versions of Masters of the Universe. In most continuities from the Filmation series onward, He-Man is the secret identity of Prince Adam, the son of King Randor and Queen Marlena, the ruling royal family of Eternia. Adam becomes He-Man by holding aloft his magic Power Sword and uttering the words "By the power of Grayskull… I have the power!" and serves as the protector of good on Eternia. He is first given this ability by the Sorceress of Castle Grayskull, a powerful magic user and mystic guardian of the castle, who in many depictions is able to transform herself into the falcon Zoar. Upon Adam's transformation into He-Man, his cowardly green pet tiger Cringer becomes the mighty Battle Cat, a giant armored feline that He-Man often rides into battle. He-Man's most prominent allies include Man-At-Arms, a wise loyal veteran soldier and inventor; and his adopted daughter Teela, a spirited and skillful female warrior, often portrayed as captain of the Eternian Royal Guard and a potential love interest of He-Man/Prince Adam. The childlike Trollan magician Orko often also features as one of He-Man's closest allies. Other prominent heroic characters include Stratos, a flying bird-man from the kingdom of Avion; Ram-Man, a stout dimwitted warrior with springlike legs and a large helmet that encloses his head and upper torso; and Man-E-Faces, an actor with face-changing abilities. Skeletor is originally described as an evil sorcerer from another dimension and in some later MOTU lore as a disfigured and vengeful relative of the royal family, known as Keldor. From his lair on Snake Mountain, Skeletor would assemble his "Evil Warriors" to assist in his various schemes to conquer Eternia. These core minions usually include Beast Man, an orange-furred, apelike master of beasts; Mer-Man, an aquatic fishlike ocean warlord; Evil-Lyn, a powerful sorceress and one of Skeletor's most feared and competent associates; Trap Jaw, an iron-jawed criminal with a mechanical arm that can be fitted by a various assortment of weapons; and Tri-Klops, a mercenary swordsman with a rotating three-eyed visor. The series overall would feature a wide and ever-expanding cast of heroic and villainous characters added to the toy line, the Filmation cartoon, and other media; with the franchise far outshining prior expectations, continuing to grow through 1983 and 1984. The release of the animated cartoon movie He-Man and She-Ra: The Secret of the Sword in the spring of 1985 introduced He-Man's twin sister She-Ra (with her secret alter ego Princess Adora) and the arch-villain Hordak (leader of the Evil Horde and the former mentor of Skeletor) on the planet Etheria. Stemming from the animated movie, Filmation went on to produce 93 episodes of the series She-Ra: Princess of Power, which ran until the end of 1987, along with the He-Man & She-Ra: Christmas Special. Some of the other main characters of the She-Ra mythos would go on to include Swift Wind, a winged unicorn and alter ego of She-Ra's trusty steed Spirit; Glimmer, the magically inclined leader of the Great Rebellion and Bow, a skilled archer and the main male protagonist of the series. They would battle to free Etheria from Hordak and his often featured henchwomen, the cloaked witch Shadow Weaver and the Force Squad captain Catra, amongst many other members of the Horde. Various children's books, magazines, comics, read-along records/cassette tapes, and other merchandise were also released worldwide in the 1980s, with much of the content based primarily on the Filmation He-Man and She-Ra series. The live-action film Masters of the Universe was released in 1987 by Cannon Films, starring Dolph Lundgren and Frank Langella. Though seemingly an alternate version of Masters of the Universe, the movie and some of its' new characters would tie-in to the later toyline and comics. These later 1980s mini comics, the Marvel comics series, and the UK magazine comics continued the adventures of He-Man and She-Ra past the end of the two Filmation series. Popularity had waned by the end of 1987 and a planned continuation of the original toy line under the heading of "The Powers of Grayskull" was started, but eventually scrapped. The series was to be set in ancient Eternia (Preternia) featuring King Hiss, the villainous leader of the Snake Men (a faction introduced in the later stages of the toyline), and He-Man's heroic magic-wielding ancestor, He-Ro. He-Man would be brought back in 1989 in an entirely new and space-based cartoon series and toy line known as "The New Adventures of He-Man." Only He-Man and Skeletor would return as major characters to join the battle between Galactic Guardians and Space Mutants on the planet Primus. Jetlag Productions would go on to produce 65 episodes of the New Adventures cartoon, with a few mini comics and adventure magazines also created for this new series. Ultimately, though, the series would not be as successful and the entire franchise would go on a hiatus for more than a decade. After some success with a "Commemorative Series" rerelease of the classic action figures in 2000, Mattel relaunched the toy line with all-new action figures, playsets, and vehicles, sculpted by Four Horsemen Studios in 2002. As part of the relaunch, a modern updated animated series was also created by Mike Young Productions, lasting for 39 episodes; featuring He-Man and his ensemble of heroic warriors, now called the "Masters of the Universe", battling Skeletor's minions, and later King Hiss, the ancient evil lord of the Snake Men, in season two. Characters such as Mekaneck, Buzz-Off, Roboto, Moss Man, Clawful, Whiplash, Two-Bad, Stinkor and several others would have more prominence and gain more elaborate backstories during the series. Several volumes of comic books were also produced to go along with the series by Image Comics and MVCreations. Although popular with longtime fans and collectors, the new series failed to catch on with a larger audience and was canceled in 2004. From 2008 to 2020, a new assortment of Masters of the Universe action figures was released by Mattel under the banner of "Masters of the Universe Classics" and was primarily geared toward the collector's market. The accompanying mini-comics and packaging biographies progressed and added many new elements to the Masters of the Universe lore, featuring themes and characters from all previous incarnations. DC Comics would follow suit and relaunch a new grittier, contemporary version of the Masters of the Universe franchise, releasing various new comic book series from 2012 until 2020. The comics included crossovers with the DC Comics Universe and ThunderCats. Netflix and DreamWorks produced an animated series entitled She-Ra and the Princesses of Power in 2018, which released five seasons until 2020. The series rebooted the She-Ra Princess of Power franchise with a new anime-inspired art style, a new origin story and an increased focus on the complex relationship between Adora (She-Ra) and Catra. In 2021 Netflix released a reimagined 'He-Man and the Masters of the Universe' series aimed at a younger audience and using CGI animation. Developed by Rob David, the series featured an updated storyline and a new stylized take on the characters and the world of Eternia. It ran for three seasons from September 2021 to August 2022, and was accompanied by a toyline from Mattel. Another more adult orientated animated series was also released by Netflix in 2021, entitled Masters of the Universe Revelation, produced by Kevin Smith, as well as a sequel series, Masters of the Universe Revolution, in 2024. To go along with the Revelation series on Netflix, the comic book license was picked up by Dark Horse Comics in 2021, debuting with a comic series of the same name. Dark Horse continues to produce Masters of the Universe comics, and featured a crossover with the Teenage Mutant Ninja Turtles, entitled 'Turtles of Grayskull'. Also in conjunction with the Netflix series, a new line of premium Masters of the Universe Masterverse action figures continues to be produced by Mattel. After years of production issues, a Masters of the Universe movie is set to hit theatres on Friday, June 5, 2026, with the first trailer revealed by Amazon on January 22nd, 2026. History and versions of the franchise Mattel began development of He-Man and the Masters of the Universe in the late 1970s with Conan the Barbarian–inspired concepts from Roger Sweet, Mark Taylor, Donald F. Glut, and several other contributors. The catalyst for the creation of He-Man began in 1976, when Mattel's CEO Ray Wagner declined a request to produce a toy line of action figures based on the characters from the George Lucas film Star Wars, with the film's toy rights being acquired by Kenner instead.[note 1] Upon the commercial success of the film trilogy and all related merchandise during the next few years, Mattel attempted to launch several unsuccessful toy lines, none of which captured the public's imagination or made a significant dent in the toy market.[note 2] In the race to design the next hit action figure, Roger Sweet, a lead designer working for Mattel's Preliminary Design Department throughout much of the 1970s and 1980s, according to his book Mastering the Universe: He-Man and the Rise and Fall of a Billion-Dollar Idea, was the first to conceptualize the idea of He-Man. However, this is not officially acknowledged by Mattel, and authorship of the He-Man character has been subject to debate.[note 3] According to various former Mattel designers, Roger Sweet drew inspiration for the designs of his first He-Man prototypes from fantasy drawings of Mattel packaging designer Mark Taylor, which included a drawing of a He-Man-like character called Torak. Roger Sweet presented the He-Man concept to Ray Wagner at the Mattel Product Conference, in the form of three large three-dimensional plaster prototype models, which Sweet dubbed the "He-Man Trio." These prototypes were molded from extensively modified Big Jim action figures (Battle Cat would also be adapted from a tiger in the Big Jim toy line). The He-Man Trio models were an axe-wielding barbarian, a tank-headed soldier, and a spaceman with a Boba Fett–like helmet. Out of the three concepts, the barbarian version of He-Man was chosen to be the basis of the toy line (this original trio-prototype idea was released around 30 years later as the figure Vykron, and the barbarian concept on its own as Vikor, in the "Masters of the Universe Classics" line). "The only way I was going to have a chance to sell this [to Wagner] was to make three 3D models—big ones. I glued a Big Jim figure [from another Mattel toy line] into a battle action pose and I added a lot of clay to his body. I then had plaster casts made. These three prototypes, which I presented in late 1980, brought He-Man into existence. I simply explained that this was a powerful figure that could be taken anywhere and dropped into any context because he had a generic name: He-Man!"[note 4] —Roger Sweet Originally set under the working title "Lords of Power," the name "Masters of the Universe" came into being when it was suggested that the former name of the toy line was too religious in nature. The roster of characters would soon expand past the main hero, He-Man, and Mark Taylor would draw inspiration for the series main villain, Skeletor, from his 1971 sketch entitled The King of Styx, along with early renderings of his characters Demo-Man and D-Man. Taylor would create preliminary designs for several other original characters as well, with additional ideas or direction from Mark Ellis and Paul Cleveland, among others, but the premise behind the toy line had not yet been fully established. The backstory of He-Man was first conceptualized for special mini-comic books that Mattel marketing director Mark Ellis promised distributors would accompany the toys. Mattel had DC Comics mock up a comic book, with the earliest storybooks written by Donald F. Glut. With major distributor Toys "R" Us concerned that "five-year-olds don't read", Mark Ellis then first proposed the idea of an animated TV special. This would eventually lead to a meeting with Filmation head Lou Scheimer and the creation of the He-Man and the Masters of the Universe animated series. Earlier in 1980, the rights-holders of Conan the Barbarian had been negotiating the character's toy rights with Mattel and they entered into an agreement the following year regarding characters from the 1982 Conan movie. However, with Mattel introducing the Masters of the Universe toy line in 1982, the rights-holders sued Mattel claiming the character was an infringement on the character of Conan. Mattel eventually won the lawsuit and after legal agreements were dissolved, it was stated that the toy line was never intended for the Conan film. However, some Conan influence can be seen, as Roger Sweet has claimed to have drawn some inspiration from the paintings of Frank Frazetta, a fantasy artist with many works depicting Conan the Barbarian, when creating He-Man. The "Masters of the Universe" toy line was created by Mattel in 1981, and first released to stores in 1982 as 5½-inch action figures (as opposed to the 3¾-inch size used by Kenner's Star Wars and Hasbro's G.I. Joe: A Real American Hero lines). The two main characters, He-Man ("the most powerful man in the universe") and his arch-enemy Skeletor ("evil lord of destruction") were the first released in action figure form, along with other core characters of the series: Man-At-Arms ("heroic master of weapons"), Beast Man ("Skeletor's savage henchman"), and Battle Cat ("He-Man's fighting tiger"). Later on that year, the first wave of action figures in 1982 would also include Teela ("heroic warrior goddess"), Mer-Man ("evil ocean warlord"), Stratos ("heroic winged warrior"), and Zodac ("the cosmic enforcer"). The Teela action figure was originally proposed as representing both the Sorceress character (when wearing the figure's "snake armor") and the Teela character (when without the "snake armor"), as Mattel believed there would not be enough demand for two female action figures in the initial wave. Alongside the first wave of figures were the Battle Ram ("mobile launcher") and Wind Raider ("assault lander") vehicles and the playset Castle Grayskull ("fortress of power and mystery"). These first figures as well as Castle Grayskull were primarily designed by Mark Taylor, although the final production sculpt of the original He-Man action figure was completed by Tony Guerrero and the first vehicles were designed by Ted Mayer. Brief descriptions of the characters would appear on the packaging and box art (with illustrations by Errol McCarthy, Rudy Obrero, William Garland, William George, and others). However, the lore of Masters of the Universe would be first fully explored through the mini-comics that accompanied the action figures throughout the duration of the line (with 49 distinct comics being issued from 1981 until 1987). The original four mini comics, He-Man and the Power Sword, The King of Castle Grayskull, Battle in the Clouds, and The Vengeance of Skeletor were made by Mattel in 1981 and written by Donald F. Glut, with artwork by Alfredo Alcala. He-Man is introduced in the first mini comic, He-man and the Power Sword, as a wandering barbarian, leaving behind his jungle tribe on Eternia. The world of Eternia is initially depicted as dealing with the aftermath of a great war that has devastated once-powerful civilizations, leaving behind their fantastical machinery and weapons. The events of the war have also opened a rift between dimensions, which has allowed the evil warlord Skeletor to travel into Eternia. This inaugural incarnation of Skeletor sets his sights on obtaining both halves of the Power Sword (originally split in two in these early stories), in order to gain entry into the ancient Castle Grayskull (depicted, in these early comics, as being inhabited by the ghostly "Spirit of Castle Grayskull"). The main premise being that whoever attains control of Castle Grayskull will gain the power to become Master of the Universe. To combat Skeletor, He-Man is given special powers, armor, and weapons by the Sorceress (she has green skin in her debut appearance and is wearing the "snake armor" that came with the original Teela action figure, instead of adorning her more familiar birdlike attire, as seen in the Filmation series). He-Man (not yet with the dual identity of Prince Adam) is supported in these initial stories by his heroic allies: Battle Cat (without the dual form of Cringer), Man-At-Arms, Teela, and Stratos, the winged warrior (who erroneously came fighting on the side of Skeletor in the initial mini-comic). Skeletor, in turn, enlists the help of the brutish apelike Beast Man and fishlike Mer-Man to battle He-Man or his heroic warriors. Other major characters introduced the following year in these early waves of action figures included He-Man's allies Ram Man ("heroic human battering ram"; with spring-loaded legs), Man-E-Faces ("heroic human…robot…monster"; with three alternate faces), and Zoar ("the fighting falcon"; whose sculpt was taken from the Big Jim toy line's "Eagle of Danger Peak"); along with Skeletor's evil warriors Tri-Klops (described on his packaging as "evil and sees everything"; with a three-eyed rotating visor), Trap Jaw ("evil and armed for combat"; with alternate weapons to place in his arm socket), Panthor (Skeletor's "savage cat"; a fuzzy purple adaptation of Battle Cat's toy mold), Screeech (Skeletor's "barbarian bird"; a purple recast of the orange Zoar), Faker ("evil robot of Skeletor"; a blue-skinned clone of He-Man, seldom featured in MOTU media, without an introductory mini-comic during his initial release), and Evil-Lyn ("evil warrior goddess"; the last figure released in this wave, she would not yet feature in any MOTU media until her prominent role in the Filmation animated series). The Attak-Trak vehicle and the Point Dread & Talon Fighter playset were also released in the 1983 line. This second series, consisting of seven new mini-comics and released in 1982–83, was produced by DC Comics, written by Gary Cohn and featured artwork by Mark Texeira. These mini-comics would devote several issues toward introducing the new action figure characters into the line. Cohn did not continue the same canon as was set in the first four minicomics. He-Man's new ally Ram Man is initially tricked into fighting on the side of Skeletor in He-Man Meets Ram-Man. Man-E-Faces is introduced in The Ordeal of Man-E-faces as an Eternian actor turned into a monster by Skeletor, freed by the Sorceress, only to be magically possessed by three multiple personalities: man, monster, and robot. Skeletor's evil warriors also get their own introductory mini comics, with Tri-Klops as a skilled swordsman/mercenary in The Terror of Tri-Klops and Trap Jaw portrayed in The Menace of Trap Jaw as a criminal from another dimension. In these pre-Filmation stories, the primary characters of Prince Adam, Cringer, Orko, and Evil-Lyn did not yet feature in the series; although the Eternian Palace and Royal Court with King Randor and Queen Marlena (both yet unnamed, looking decidedly older than in the later series) are featured in several of these DC mini-comics, as are the mystical falcon Zoar (not yet an alternate form of the Sorceress) and the Attak-Trak (battle machine, based on the toy, and not yet a robotic-voiced van-like vehicle, as in the Filmation cartoon). The storyline concept of Teela as the secret daughter of the Sorceress (albeit as a clone) and adopted daughter of Man-At-Arms was first introduced at this time as well in the mini comic The Tale of Teela. A special comic and record entitled The Power of Point Dread/Danger at Castle Grayskull was also produced for the Talon Fighter and Point Dread playset. Additional waves of action figures, creatures, vehicles, and playsets were released every year until 1987, totaling 70 distinct figures in all (including 24 creatures, 12 vehicles, six playsets, and 10 accessories) with the final overseas releases from the original line coming from Italy in 1988. A major proponent of the 1980s action-figure boom, Masters of the Universe figures proved to be very popular and were produced and marketed all over the world. Most of the action figures were made in Taiwan and Malaysia. However, Mattel also had production facilities in the United States, Mexico, France and Spain, and joint ventures with Leo Toys of India, Top Toys of Argentina, Estrela of Brazil, Rotoplast of Venezuela and Takara of Japan. In July 1982, He-Man and the Masters of the Universe would appear for the first time in the pages of DC Comics with DC Comics Presents Issue #47, in the story From Eternia With Death, followed by a special insert comic in many DC's titles from November 1982, entitled Fate is the Killer. In these first two DC MOTU stories, Superman ends up on Eternia, joining with He-Man to combat Skeletor and his minions. He-Man's original DC comic run finished up with a three-issue miniseries at the start of 1983 (all written by Paul Kupperberg, with artwork by Curt Swan and George Tuska). These issues would introduce the Eternian Royal Family, most notably Prince Adam (DC Comics Presents #47), and his transformation into He-Man in the series. This version of Adam, however, was originally depicted wearing a blue vest and portrayed as somewhat of a philanderer, rather than his later more wholesome pink-vest-wearing character. Also unique to these issues, Adam transforms inside the "Cavern of Power," instead of his more famous "By the power of Grayskull!" line. The Sorceress, now residing in the Cavern of Power, is still depicted wearing the Teela Snake Armor, and is often referred to as "The Goddess" throughout the series. Other entries into the Masters of the Universe mythos, such as Cringer as the alter ego of Battle Cat, Zodac as a neutral cosmic enforcer, Stratos as leader of his home world of Avion, and Adam's mother, Queen Marlena, as an astronaut hailing from Earth, were all partly introduced in these early DC issues. In 1983, Masters of the Universe would debut perhaps its most famous incarnation, with the animated series He-Man and the Masters of the Universe. Created by Filmation under the direction of executive producer Lou Scheimer, the cartoon made its television debut on September 5, 1983, with the episode "The Diamond Ray of Disappearance". Running through two seasons, He-Man and the Masters of the Universe was one of the first animated series produced directly for weekday syndication, as opposed to reruns primarily based on Saturday mornings. Totaling 130 episodes, with each season of 65 episodes stretching across 13 weeks, the series' last episode, "The Cold Zone," aired on November 21, 1985. Similar to the comics that came before, the series is set on Eternia, which is ruled by King Randor and Queen Marlena (visibly younger in age and with more colorful attire than their previous comic versions). Their son, Prince Adam (now wearing his more familiar pink vest), pretends to be somewhat lazy, clumsy, and irresponsible, much like his pet tiger Cringer (depicted in the series as being very cowardly and with the ability to speak). For the first time, Prince Adam is shown to transform into He-Man by holding aloft his magic sword and saying the magic words, "By the power of Grayskull…I have the power!!!" It is revealed in the introduction that Prince Adam's secret identity of He-Man is known only by the Sorceress of Castle Grayskull (now with the familiar birdlike costume, who often takes the form of Zoar the falcon), Man-At-Arms (now sporting a mustache and often referred to by his first name Duncan; he is portrayed as scientific inventor as well as a warrior), and Orko (making his full debut as a mainstay in the franchise, Orko is presented as a floating childlike Trollan magician, often used for comic relief and as a point-of-view character for children). Rounding out the main cast of heroes is Teela (now firmly depicted with red hair, she is the Captain of the Royal Guard, the adopted daughter of Man-At-Arms, and secret child of the Sorceress; who serves as a teasing and semi-antagonistic love interest of Adam and He-Man throughout the series). Also featuring in the series with semi-regularity are Stratos (the flying leader of the bird people of Avion) and Ram-Man (portrayed as a dim-witted but likable bouncing warrior). Appearing with much less frequency in the series are He-Man's recurring allies Zodac (less neutral and more of an omniscient cosmic peacekeeper, often assisting He-Man), Man-E-Faces (presented this time as a master of disguise, an actor who occasionally employs his abilities to help He-Man), Buzz-Off (leader of a race of bee people), Fisto (debuts as powerful loner and adversary of He-Man before joining forces), Mekaneck (loyal warrior with a bionic neck, searching for his lost son), Roboto (robotic alien explorer marooned on Eternia), Sy-Klone (spinning tornado-like warrior, who appears without a backstory), Moss Man (transforming plant being and spy), and several characters that would not receive action-figure releases in the original line such as Lizard-Man, the Royal Archeologist Melaktha, Trollans Dree-Elle and Montork, Avion bird people Delora and Hawke, Adam's grandfather King Miro, Squinch and the Widgets, and the wise and ancient dragon Granamyr. He-Man's nemesis, the evil wizard Skeletor (now famously portrayed by voice actor Alan Oppenheimer as a cackling and more comedic villain), still wishes to conquer Castle Grayskull and learn of its secrets, but also now desires to take over the royal palace and rule Eternia; often seeking ancient and mysterious beasts and artifacts to try and stop He-Man and his allies. Skeletor often hosts his rogues gallery inside his headquarters, Snake Mountain, gathered around his bone-filled throne, plotting and peering through a magic orb to spy on He-Man and his friends. Often this group of evil minions consists of the cunning female sorcerer Evil-Lyn (making her full debut into the MOTU mythos as Skeletor's most dangerous counterpart in the Filmation series) and his most frequent sidekicks: the bumbling Beast Man (who possesses the ability to control various creatures through telepathy) and the equally inept weapon-armed Trap Jaw. Skeletor's original henchmen in the cartoon also include Mer-Man (with a distinctive gurgling voice portrayal, also by Alan Oppenheimer), Tri-Klops (with a more robotic voice and persona), and Skeletor's purple pet feline Panthor. Other henchmen making a few appearances later in the series are Webstor (one of Skeletor's more intelligent henchmen, often paired with Kobra Khan), Kobra Khan (menacing Repton able to spray sleeping gas from his cobra hood), Two-Bad (bumbling henchman with two often arguing heads), Spikor (depicted as possibly Skeletor's most dimwitted minion in all of the Filmation series), Modulok (deranged and mutated scientist, once known as Galen Nycroft), Clawful (a far more cunning villain in this version than other representations of the character), and Whiplash (appearing the most out of the later henchmen). Some of Skeletor's rogues would appear only once in the Filmation cartoon, such as Faker (appearing only briefly as a magical clone of He-Man before being tossed into the bottomless abyss outside Castle Grayskull), Jitsu (called "Chopper" in the script), Batros, Icer, Fang-Man, Dragoon, and Strong-Arm. Other villains not allied with Skeletor would occasionally appear as well, such as the powerful wizard Count Marzo, the plant-demon Evilseed, Kothos, Shokoti, Negator, and the rabbitlike space pirate Plundor, to name a few. Despite the limited animation techniques that were used to produce the series, He-Man and the Masters of the Universe was notable for breaking the boundaries of censorship that had severely restricted the narrative scope of children's TV programming in the 1970s. For the first time, a cartoon series could feature a muscular superhero who engaged in on-screen combat (although most of the time wrestling-style moves were utilized instead of direct violence). The cartoon was also groundbreaking in that it was produced in connection with marketing a line of toys, as advertising directly to children was controversial during this period. As an attempt to mitigate the negative publicity generated by these controversies, a "life lesson" or "moral of the story" was played at the end of each episode, which was usually tied to the action or central theme of the episode in question (although in the United Kingdom, the closing "morals" were often edited out of the original broadcasts). The series featured the voice talents of John Erwin, who starred as He-Man/Prince Adam, Beast Man, Ram Man, Webstor, Whiplash, and many others; the aforementioned Alan Oppenheimer, voicing Skeletor, Man-At-Arms, Battle Cat/Cringer, Mer-Man, Buzz-Off, and many others; Linda Gary as much of the female cast with Teela, the Sorceress, Evil-Lyn, and Queen Marlena; and executive producer Lou Scheimer providing the voice work for a multitude of other characters such as Orko, King Randor, Stratos, Trap Jaw, Tri-Klops, Man-E-Faces, Mekaneck, Fitso, Clawful, Kobra Khan, Spikor, and Two Bad, to name a few. The series was often produced by Lou Scheimer and Hal Sutherland and directed by Gwen Wetzler, Marsh Lamore, Lou Kachivas, Steve Clark, Ernie Schmidt, Ed Friedman, and others; with Tom Sito serving as a main storyboard artist, along with Tom Tataranowicz, Warren Greenwood, Robert Lamb, Don Manuel, Bob Arkwright, and many other contributors. Writers on the show included Larry DiTillio, David Wise, Robby London, Michael Reaves, Doug Booth, J. Brynne Stephens, and many others, including early script-writing work from Babylon 5 creator J. Michael Straczynski, Paul Dini of Batman: The Animated Series fame, and one episode, "Battle Cat," by D. C. Fontana of Star Trek fame. The series, although still popular, would not be renewed for a third season in 1985. However, the characters would make occasional guest appearances in the She-Ra: Princess of Power Series, which was set in the same universe and followed the same continuity. The She-Ra series began with a 5-part animated serial which was later condensed into the animated movie The Secret of the Sword, released theatrically in the spring of 1985 and featuring most of the main characters from both cartoons. The characters would continue to appear in guest roles throughout the She-Ra series, as well as a Christmas Special. The very last appearance of Filmation's He-Man and Skeletor is in one of the final She-Ra episodes, entitled "Assault on the Hive," airing December 13, 1986. Sales of the toy line continued to increase with the exposure of the animated series, and new waves of figures and vehicles were produced during this peak of popularity. First introduced into the action figure line in 1984 were new "Battle Armor" versions of He-Man and Skeletor, who could be "battle damaged" when the mechanism on the figure's chest was pressed. These new renditions of He-Man and Skeletor did not appear in the animated series or the mini comics, but several new characters in the Filmation series found releases in these third and fourth waves of action figures. Making their toy-line debuts in 1984 were He-Man's allies Buzz-Off ("heroic spy in the sky"; bee-like insectoid warrior with wings), Fisto ("heroic hand-to-hand fighter"; bearded warrior with a large smashing fist as an action feature), and Mekaneck ("heroic human periscope"; featuring an extending bionic neck). The first action figures for Prince Adam ("heroic secret identity of He-Man") and Orko ("heroic court magician"; utilizing a pull-cord feature that sent the figure spinning around when placed on a flat surface) were also produced in this third wave. Skeletor's evil warriors received new recruits as well, with Clawful ("warrior with the grip of evil"; crab-like creature with an oversize pincer for a hand), Jitsu ("evil master of martial arts"; human warrior with a gold chopping hand action feature), Kobra Khan ("evil master of snakes"; reptilian warrior able to be filled with water to spray "poison" mist on his enemies), Webstor ("evil master of escape"; spider-faced warrior with a working grappling hook/backpack pulley system), and Whiplash ("evil tail-thrashing warrior"; reptilian with a rubber tail) all added to the line in 1984. Vehicles produced in 1984 include the Dragon Walker ("sidewinding beast/vehicle"), Road Ripper ("warrior carrier," with a fast-action pull cord), Roton ("evil assault vehicle," with a round rotating outer disc), and Stridor ("heroic armored war horse," often paired with Fisto). The major playset that year was Skeletor's evil stronghold, Snake Mountain (looking quite unlike the Filmation version, with a giant ghoulish face molded into the plastic and a voice-distorting wolf-headed microphone). Series three of Mattel's MOTU mini comics contained stories similar to the Filmation animated series, with mini comics such as Dragon's Gift, Masks of Power, and Double-Edge Sword adapting stories straight from the first-season episodes of the same name. There were some differences from Filmation, however, as can be seen in The Temple of Darkness mini comic with the Sorceress, now in her birdlike Filmation attire, but in an all-white version of the costume. The mini comics He-Man and the Insect People and The Clash of Arms included many of the new characters from the toy line such as Buzz-Off, Mekaneck, Fisto, Stridor, Webstor, Clawful, and Whiplash; while others such as The Secret Liquid of Life, Slave City, and The Siege of Avion had less to do with the toy line and introduced new original mini-comic characters instead, such as He-Man's childhood friend Prince Dakon, the evil Geldor, the Kobold master Lodar, and Haramesh the demon. The 1985 wave of action figures again included new versions of He-Man and Skeletor with special action features: Thunder-Punch He-Man (whose backpack could be loaded with plastic ring caps to create a loud "bang" when turning He-Man's waist) and Dragon Blaster Skeletor (which included a small water-squirting dragon chained to Skeletor's armor). Heroic warriors included in the line were Moss Man ("heroic spy and master of camouflage"; a fuzzy pine-scented retooling of the Beast-Man mold), Roboto ("heroic mechanical warrior"; featuring moving gears and multiple weapons that could be inserted into his arm socket), and Sy-Klone ("heroic fist-flinging tornado"; with a dial on his waist allowing his torso to be spun around continuously). Evil warriors in 1985 consisted of Spikor ("untouchable master of evil combat"; covered in purple rubber spikes with a trident for an arm), Two Bad ("double-headed evil strategist"; whose spring-action arms allowed the figure to punch himself in either face), and Stinkor ("evil master of odors"; a foul-smelling reworking of the Mer-Man mold and the only character from the 1985 line that would not make an appearance in the Filmation cartoon). Vehicles produced in this fourth wave were Bashasaurus ("heroic combat vehicle"; with a large bashing club arm), Battle Bones ("collector's carry case" and dinosaur skeleton brought to life in the mini comics), Land Shark ("evil monster/vehicle"; Skeletor's tank with a purple chomping shark mouth), Night Stalker ("evil armored battle steed"; a recolored Stridor toy, often associated with Jitsu), and Spydor ("evil stalker"; Skeletor's giant mechanical spider). The largest addition to the 1985 Masters of the Universe toy line came in the form of the Evil Horde, whose characters were set to debut in the animated He-Man and She-Ra: The Secret of the Sword motion picture. Although villains in the soon-to-debut She-Ra: Princess of Power animated series, five out of the six initial Evil Horde action figures were produced for the Masters of Universe line instead of the Princess of Power toy line (with the Horde villainess Catra being the sole exception). The new main villain Hordak ("ruthless leader of the Evil Horde") was followed in action-figure form by his underlings, Mantenna ("evil spy with the pop-out eyes"), Leech ("evil master of power suction", with suction-cup hands and mouth), Grizzlor ("hairy henchman of the Evil Horde", with actual imitation fur), and Modulok ("evil beast with a thousand bodies"; a unique figure with 22 segmented body parts that could be taken apart and reassembled into more than 1,000 different combinations). Hordak's lair, the Fright Zone, was also released as a playset in 1985, although it bore no resemblance at all to the mechanical-/industrial-looking Fright Zone seen in the animated She-Ra series. Series four of the mini comics in 1985 began to depart from some aspects of Filmation's continuity, as each member of the Evil Horde appeared in their own titular mini comic, focusing more on their attempts to attack He-Man and invade Eternia rather than anything She-Ra/Princess of Power–related. Likewise, Skeletor's dragon-blaster and He-Man's thunder-punch powers were never seen in the animated series, but debut here in the mini comics Skeletor's Dragon and The Treachery of Modulok. Roboto also received an alternate origin story in The Battle of Roboto, being a creation of Man-At-Arms rather than a wandering alien, as in the Filmation series. Stinkor and Spikor starred in their own mini comics as well, in The Stench of Evil and Spikor Strikes, which also included Moss Man, Sy-Klone (referred to as "Tornado"), and the Spydor vehicle. Only the mini comic The Obelisk followed the established continuity more closely and did not feature any of the new characters or vehicles. Michael Halperin and Christy Marx wrote many of the 1984 and 1985 mini comics, while Lee Nordling often served as editor. Larry Houston, Michael Lee, and Alfred Alcala composed most of the artwork for these issues, while DC Comics' Bruce Timm was the illustrator for Grizzlor - The Legend Comes Alive! In 1984, Mattel and Filmation decided to diversify the Masters of the Universe line beyond its traditional realm of "male action," in the hopes of bringing in a young female audience as well. Thus, She-Ra, a feminine warrior-woman heroine, in the same vein as He-Man, was proposed with an all new line of dolls/action figures for girls. In conjunction with the toy line, Filmation would begin work on a new animated series titled She-Ra: Princess of Power, featuring this new main character. She-Ra would be revealed as Princess Adora, the long-lost twin sister of Prince Adam/He-Man, living on Eternia's sister planet of Etheria, ruled by Hordak, the main antagonist of the new series and the tyrannical leader of the Evil Horde. She-Ra would first be introduced in the animated feature He-Man and She-Ra: The Secret of the Sword, released in theaters on March 22, 1985. The film would feature most major characters from He-Man and the Masters of the Universe and introduce many of the new characters and concepts behind the new series (with the backstory developed by Filmation writers Larry DiTillio and J. Michael Straczynski). Filmation's She-Ra: Princess of Power first aired "The Sword of She-Ra Part 1: Into Etheria" on September 9, 1985. The Secret of the Sword animated movie from earlier that spring was essentially a compilation of what would become the first five episodes of the She-Ra cartoon series. The series would run for two seasons, 93 episodes, from 1985 to 1987. She-Ra: Princess of Power was produced in lieu of continuing He-Man and the Masters of the Universe for a third year; however, He-Man often appeared in episodes of She-Ra to aid his sister, and several other characters from He-Man and the Masters of the Universe, both heroic and evil, also appeared in multiple crossovers. She-Ra was born as Princess Adora on Eternia, Prince Adam/He-Man's twin sister and daughter of King Randor and Queen Marlena. As an infant, Adora is kidnapped by Hordak (vampire/demon-faced sorcerer with a cowl of bones, who can transform his body into various mechanical devices) and Skeletor (Hordak's apprentice at the time) and taken to the world of Etheria (a planet ruled by the Horde, and the main setting of the She-Ra series). Adora is raised and brainwashed by Hordak and his confidant Shadow Weaver (a red-robed witch with a hidden face, powerful in dark magic), to eventually become Force Captain of the Horde. After encountering her brother He-Man (who is on a mission from the Sorceress to find her on Etheria), she eventually acquires the Sword of Protection and seeks to learn the true evil of the Horde. After first transforming into She-Ra and seeing the error of her ways, she becomes a member of the Great Rebellion; a secret small band of rebels, living in the Whispering Woods and fighting to free Etheria from the tyrannical rule of Hordak. Just as Prince Adam transforms into He-Man with the use of his Sword of Power, Adora transforms into She-Ra via her Sword of Protection, a replica of He-Man's sword featuring a smooth blue gem in its hilt. Unlike He-Man's sword, She-Ra's possesses the ability to transform into different weapons and accessories, such as a lasso, a shield, or a flaming blade. Like her brother Adam, however, Adora's transformation into She-Ra is similarly triggered by holding her sword over her head, but with her own unique invocation: "For the honor of Grayskull…I am She-Ra!" Also similar to He-Man and Cringer/Battle Cat, She-Ra transforms her horse Spirit into the flying unicorn Swift Wind. Though strong like He-Man, She-Ra is shown to have additional powers as well, such as the ability to heal with her touch and communicate with animals via telepathy. The premise of the She-Ra TV series was the reverse of the He-Man cartoon, where the heroes are actually rebels countering an evil establishment (rather than Skeletor trying to conquer Eternia). The Great Rebellion is originally led by Queen Angela (winged queen of Bright Moon, freed by She-Ra from the clutches of Hunga the Harpy) and her daughter Glimmer (pink-haired magic user with the ability to manipulate light), with the main cast of the Princess of Power cartoon also including the skilled archer Bow (the main male heroic character of the series), Bow's timid companion Kowl (a flying owl-/koala-like creature with large rainbow-colored ears), and the absent-minded magician Madame Razz and her wise-cracking sidekick, Broom. Also appearing in many episodes are the small imp-like forest-dwelling Twiggits (mainly Sprockett, Spritina, and Spragg) and the mystical Light Hope, who serves as a "Sorceress of Grayskull–type" guide to She-Ra, residing high atop Mount Skydancer in the Crystal Castle. Throughout the series, recurring characters and members/allies of the Rebellion included Adora's swashbuckling love interest Sea-Hawk, the flirtatious ice queen Frosta, powerful sorcerer queen Castaspella, the mermaid princess Mermista, flower-loving Perfuma, net-tossing Netossa, far-seeing Peekablue, butterfly-like Flutterina, and the intergalactic scout Sweet Bee. With the He-Man and the Masters of the Universe cartoon no longer in production, MOTU toy-line characters also appeared in the She-Ra series, such as the elephant warrior Snout Spout (referred to as "Hose Nose"), and the Comet Warriors Rokkon and Stonedar. A special character, Loo-Kee, was also introduced, hiding somewhere in the background of nearly every episode of the series; emerging at the end of the episode, revealing to viewers where he had been hiding and relating the moral of the story. Light Hope, mystical living beam of light and mentor to She-Ra; and her Great Rebellion allies Glimmer, magically inclined onetime leader of the rebellion; Bow, skilled archer and the main male protagonist of the series; Kowl, Bow's owllike, rainbow-eared companion; Madame Razz, absent-minded witch with her sarcastic sentient Broom; and Queen Angella, Glimmer's mother and angel-winged queen of the Bright Moon; along with Hordak's spell-casting witch Shadow Weaver; shape-shifting spy Imp; bumbling bug-eyed henchman Mantenna; Force Squad captain Catra; evil scientist Modulok; beastly warrior Grizzlor; energy-draining Leech; and thuggish henchwoman Scorpia. The ruling antagonist faction of the series, the Evil Horde (whose members are often depicted with a bat-like insignia), is led on Etheria by Hordak (as voiced by George DiCenzo, portrayed with a snorting laugh and temperament slightly more fearsome than Skeletor's), who rules Etheria from the industrial-/technological-looking monstrosity known as the Fright Zone. The Horde enslaves the people of Etheria through Hordak's legions of armored robot-like Horde Troopers, mechanized vehicles, and his special task force of henchman known as the Force Squad. The Force Squad, lead originally by Adora and now by Catra (raven-haired villainess with a magic mask, giving her the ability to turn into a vicious panther), consists of the bug-eyed Mantenna (whom Hordak loves to torment, often dropping him through trapdoors), the fearsome Beast Island operator Grizzlor, the hulking life-force-draining amphibian-like Leech, the whiny shape-shifting Imp, and the pincer-clawed scorpion woman, Scorpia. The Horde was later joined by others, including Skeletor's former scientist henchman Modulok, his robotic creation Multi-Bot, the future Snake Men Tung-Lashor and Rattlor, Entrapta the evil inventor with deadly braids, the octopus woman Octavia, the Horde zookeeper Vultak, and the robot Horde Trooper commander Dylamug. The overarching interplanetary supreme leader of the Horde, Horde Prime, who held leadership over both Hordak and Skeletor, was also introduced during the She-Ra Filmation series. Some of the other popular one-off heroes and villains were Spinnerella, Huntara, General Sunder, False-Face, Colonel Blast, the Red Knight, Granita the comet warrior, Sorrowful the Dragon, the Meteorbs, and the Star Sisters. She-Ra and Adora were voiced in the series by Melendy Britt (who also voiced Catra, Castaspella, Mermista, and Octavia); George DiCenzo was the voice of Hordak, Bow, Sea-Hawk, Tung-Lashor, and a few others; and Diane Pershing provided the voice for Netossa and Spinnerella. Alan Oppenheimer and John Erwin would reprise their roles from the He-Man and the Masters of the Universe series, as would Linda Gary with Teela and the Sorceress, while providing additional voice work for Glimmer, Madame Razz, Sweet Bee, Shadow Weaver, Scorpia, and Entrapta. Credited as "Erik Gunden," Lou Scheimer returned as well to provide voices for a plethora of characters, including Swift Wind, Kowl, Light Hope, Broom, Mantenna, Leech, Grizzlor, Modulok, Horde Prime, Multi-Bot, Rattlor, Orko, the Horde Troopers, and many of the Twiggits; while his daughter, Erika Scheimer, took a more prominent role in this series, providing the voices for Loo-Kee, Queen Angella, Frosta, Imp, and several of She-Ra's female associates. She-Ra: Princess of Power would air its final episode, "Swifty's Baby," on December 12, 1987, with no real finale for either the She-Ra or He-Man Filmation series. Released in 1985, Mattel's toy line Princess of Power (sometimes abbreviated as POP) featured almost exclusively female characters, all of whom featured an emphasis on hair and clothing, with "real" hair and partially soft-goods costumes. Described as "fashion action dolls," essentially the line attempted to fuse the appeal of Masters of the Universe with Mattel's successful line of fashion dolls, Barbie, and added many "Fantastic Fashions" clothing accessories packs to complement the female action figures. The 1985 line of Princess of Power figures included She-Ra (without a separate action figure for Princess Adora), Bow (the only male figure in the POP line, without his moustache, as seen in the cartoon series), Glimmer ("the guide who lights the way"), Kowl ("the know-it owl"), Angella ("angelic winged guide"), Frosta ("ice empress of Etheria"), Castaspella ("enchantress who hypnotizes"), Catra ("jealous beauty" and the main female antagonist), and Double Trouble ("glamorous double agent"; created only for the toy line and mini comics, never appearing in the Filmation cartoon series). She-Ra's main playset was Crystal Castle, a "shimmering castle of fantasy and fun for She-Ra and her friends!" Enchanta, a large swan creature/vehicle, was also produced in the first wave of toys, as were several horses to accompany the figures: Swift Wind for She-Ra, Arrow for Bow, and Storm for Catra. The Princess of Power toy line ran from 1985 to 1987, for which Mattel would release a total of 22 action figure/dolls (with 12 creatures, two playsets, and 16 clothing accessories). Apart from the main Princess of Power line, the preeminent villains of the She-Ra series, Hordak and the Evil Horde (originally created by Filmation in collaboration with Mattel), were released by Mattel under the Masters of the Universe branding. The character Catra was the only villain to be released in the first wave of the Princess of Power figures, with Mattel downplaying her connection to the Evil Horde in the toy line. In 1986, a new "Scratchin' Sound" version of Catra was joined by her feline pet Clawdeen and fellow Horde-Villainess Entrapta. She-Ra (with a new "Starburst" version) was accompanied in the second wave by her allies Flutterina, Mermista, Peekablue, Perfuma, and Sweet Bee. "Crystal" translucent plastic versions of Swift Wind and the horses Sun Dancer and Moonbeam were also released in wave two, along with the Butterflyer and Sea Harp creature/vehicles and the Crystal Falls playset. The third and final wave saw diminished sales and production in 1987, with the releases of Netossa, Spinnerella, and Loo-Kee; along with "Bubble Power" She-Ra, "Royal" Swift Wind, "Silver" Storm, and "Shower Power" Catra. Several recurring characters from the She-Ra cartoon did not receive action figures in either the original POP or MOTU toy lines—such as Madame Razz (or her Broom), Light Hope, the Twiggits, Sea-Hawk, Shadow Weaver, Scorpia, Imp, Octavia, or Hunga the Harpy, though nearly all of these omitted (from the original toy-lines)characters would receive action figures in the 2008-2016 produced Masters of The Universe Classics revival line for collectors. She-Ra would also feature in 13 of her own mini comics (packaged with the figures), along with several children's books, comic magazines, and read-along record/cassette-tape books. The final series of action figures and mini comics, in 1986 and 1987, would continue on the adventures past the animated series and its sequel in the She-Ra line, introducing new characters not seen in the cartoon series such as the heroic warriors: Rio Blast ("transforming gunslinger"), Clamp Champ ("master of capture"), and Extendar ("master of extension"); the evil warriors: Blast-Attak ("blast-apart robotic warrior"), Ninjor ("evil ninja warrior"), and Scare-Glow ("evil ghost of Skeletor"); the Snake Men: King Hiss ("dreadful disguised leader of the Snake Men"), Sssqueeze ("evil long-armed viper"), and Snake-Face ("most gruesome of the Snake Men"); the Hordesmen: Dragstor ("transforming warrior/vehicle") and Mosquitor ("energy-draining insectoid"); and the spinning-top-like Energy Zoids: Rotar and Twistoid. Aside from these new characters, longtime MOTU staple characters King Randor ("heroic ruler of Eternia") and the Sorceress ("heroic guardian of Castle Grayskull") were finally represented in action-figure form. Other later MOTU characters that had only appeared in the She-Ra: Princess of Power animated series also saw release in the form of the elephant-headed Snout Spout ("heroic water-blasting firefighter"); the rock warriors: Rokkon ("young heroic comet warrior") and Stonedar ("heroic rock people leader"); the Snake Men: Tung Lashor ("evil tongue-shooting Snake Men creature") and Rattlor ("evil Snake Men creature with the quick-strike head"); and the Horde members: Multi-Bot ("evil robot of a thousand bodies", similar to the prior interchangeable body-segment Modulok figure) and the Horde Trooper ("evil collapsing robot" and the only generic troop/soldier figures of the toy line). New versions of the lead characters were also produced, with "Flying Fists" He-Man, "Terror Claws" Skeletor, and Hordak in two new forms ("Hurricane" Hordak and "Buzz-Saw" Hordak). The Evil Horde obtained their first vehicle/creatures in the toy line with Mantisaur ("the evil insectoid steed") and Monstroid ("the ultimate battling monster", that had an entirely different depiction in the animated series); while the Horde's Slime Pit playset (a dinosaur-skull-headed torture device) proved to be quite popular in 1986, coming complete with canisters of green ooze to pour over the action figures, while held in place with a giant claw. Also that same year, "the land and sky disc launcher", Blaster Hawk, and "the road rocket", Laser Bolt, were produced for He-Man's heroic warriors; while Skeletor gained the "dragonfly attack vehicle", known as the Fright Fighter. At a less expensive price point, several accessory packs of smaller vehicle/weapons included the Megalaser, Jet Sled, and Stilt Stalkers in 1986; and the Scubattack, Tower Tools, Cliff Climber, Beam Blaster, and Artilleray set and several small transforming egg-shaped creatures, known as Meteorbs, late into the line in 1987. Also late into the line in 1987 were three original characters from the live-action movie: Blade ("evil masters of swords"), Saurod ("evil spark-shooting reptile"), and Gwildor ("heroic creator of the Cosmic Key"), with their entry into the MOTU mythos explained in one of the last original mini comics, The Cosmic Key. No other movie-related figures were produced; however, in 1988, the final action figures of the original toy line, the "Laser Power" versions of He-Man and Skeletor, did bear some resemblance to their live-action movie counterparts and were released only to European markets. One of the main storylines of the later mini comics, released with these later waves of action figures, was the introduction of a new major villain faction known as the Snake Men, first appearing in the mini comic King of the Snake Men. Kobra Khan, Tung-Lashor, and Rattlor (who previously appeared in the He-Man and She-Ra cartoon series with Skeletor, and/or as members of the Horde), were now under the leadership of the ancient Eternian King Hiss, whose Snake Men army rose from Eternia's past, joining forces with Skeletor to once again rule Eternia (additional Snake Men were later added to the roster in the form of the long-armed Sssqueeze and the medusa-like Snake Face in the mini comic Revenge of the Snake Men). Another major mini comic storyline of this period included the introduction of the three-towered fortress of Eternia in The Ultimate Battleground, which was a massive final playset for MOTU, one of the biggest of all 1980s toy lines, complete with a motorized monorail circling the towers. Other notable mini comics included the debut of Hordak's gruesome mind-altering Slime Pit in Escape from the Slime Pit, one of several origin stories for Rokkon and Stonedar in Rock People to the Rescue, cybernetic Horde experiments resulting in the creation of the warriors Dragstor and Extendar in The Warrior Machine, and the suggested origin of Skeletor as Keldor in The Search for Keldor (which also included the only mini comic appearances for He-Man's ally Clamp Champ, and Skeletor's minions Ninjor, Scare Glow, and Faker). All of this was leading toward what would have been a continuation of the series in "The Powers of Grayskull" line, before being discontinued. These series five and six mini comics were often edited by Lee Nordling with art direction from Ron Cook, and included writing by Tim Kiplin, Phil White, and Steven Grant, with the artwork of Bruce Timm, Jim Mitchell, Chris Carlson, Charles Simpson, and Larry Houston, among others. The proposed exploration of the distant past of Eternia, dubbed "Preternia," forms the basis of what was originally to be the next incarnation of the toy line, entitled "The Powers of Grayskull." However the toy line was canceled very early on, with only a few toys released (like the dinosaur-themed creatures Turbodactyl, Bionatops, Tyrantisaurus Rex, and the rare Italian-only-released giant figures Tytus and Megator). The main story information originates from the final mini comic The Powers of Grayskull—The Legend Begins!, which was intended as the first of a three-part series; however, only this issue appeared. The proposed storyline was to focus on Ancient Eternia, which was populated by many creatures, including the aforementioned cybernetic dinosaurs and giants. When the Sorceress and He-Man arrive, followed by Skeletor, they find King Hiss leading an attack on a village in the hope of drawing out "The Elders," using some of the cybernetic dinosaurs to their advantage. Hiss serves an "unnamed one" and agrees to unite with Skeletor on the basis that he might be an emissary. Seeing Skeletor's interference, the Sorceress allows He-Man to enter the battle but, "for reasons that will be made clear to you in the future," he had to be disguised. He finds himself overwhelmed, but then a shadowy figure appears who turns the odds with a powerful wand. The stranger then sends the Snake Men back to their base and all the time travelers home. The Sorceress describes the intervener as "the Greatest Sorcerer of all" and He-Man is left asking, "But who is he?" No further story information is given and it remains unclear how the giants mentioned and released as toys would fit into the story. However, some marketing press releases and prototypes have shed further information on this. The wizard was to be He-Ro, an ancestor of He-Man. Raised by his mentor Eldor and discovering special powers in a cave, He-Ro would have led the fight against the Snake Men. According to the mini comics' writers, it was intended that the central antagonist would be Keldor, a character revealed similarly late in the line to have been He-Man's uncle and also strongly hinted to have been the former identity of Skeletor. Whether or not Keldor was also supposed to be the "Unnamed One" Hiss served is not clear, although in an interview writer Steven Grant vaguely recalls that the intention was that the Unnamed One would be a greater evil who, as the Emperor was to Darth Vader, was intended to be the one who caused Keldor to become Skeletor. In the years after the animated series ended, generally going along with the established Filmation continuity, Marvel Comics would release a younger-skewing Star Comics Masters of the Universe series that ran from 1986 to 1988 bimonthly and produced 13 issues; featuring many of the later characters introduced in the toy line, as well as new ones such as Lieutenant Andra. Apart from the standard comic-book format, there was a He-Man and the Masters of the Universe Magazine, a U.S.-based fan-club magazine featuring puzzles, fan letters, feature stories, and comic strips (running 16 issues, 1985–88; She-Ra also with a similar magazine, running six issues). This magazine series featured well-rendered covers and posters by artist Earl Norem and a create a character contest, with the winner, Nathan Bitner, revealed in the spring 1986 issue. Bitner's creation, Fearless Photog, was never realized in the 1980s and an action figure was not produced until the Masters of the Universe Classics collector's toy line in 2012. Daily Masters of the Universe comic strips were also in newspaper syndication from 1985 until 1989. The strips were primarily written by Chris Weber and edited by Karen Willson, with distribution in the U.S. and worldwide in countries such as Brazil, India, Greece, and the former Yugoslavia. The newspaper strips were generally lesser known to the wider fan base until 1,639 of the 1,674 daily strips were finally collected in hardcover format with He-Man and the Masters of the Universe: The Newspaper Comic Strips, released by Dark Horse Books in 2017. Various comics and magazines containing Masters of the Universe–related content were also released outside the United States, in the United Kingdom, Germany, France (as Musclor et les Maîtres de l'univers), Finland, Argentina, Brazil, Spain, Italy, and several other countries in the late 1980s. One of the most notable was produced by Egmont's London Editions in the United Kingdom, which published 72 issues biweekly of their By The Power Of Grayskull...Masters Of The Universe comic magazine from 1986 to 1988. The series was headed by Brian Clarke, and is often noted for in-depth stories expanding the canon and the origins of many Masters of the Universe characters. In addition, London Editions would introduce several new characters, such as "Scrollos," who served as an in-universe editor and guide to the series. From issue 50 onward, the series would begin to reprint many translated and reworked versions of Ehapa's German Language comics, although original content was still produced for "the Secret Files of Scrollos" portion of the comic magazine until its demise in late 1988. Fourteen issues of For the Honor of Grayskull She-Ra were also produced by London Editions from 1986 to 1987, as were several one-shot special issues, which included a dual He-Man and She-Ra feature-length adventure in Twins of Power. Starting in 1987, London Editions added a second larger monthly comic magazine entitled Masters of the Universe Adventure, which ran for 18 issues before turning into a New Adventures themed magazine He-Man Adventure for six more issues, before ending the series with four final issues in a best-of format of reprints in 1991. Original comic-book content was created in Germany as well, first by Interpart/Condor for 18 issues from 1984 to 1987, then in Egmont's Ehapa Masters of the Universe comics for 21 issues from 1987 to 1989, with promotional content also appearing in several German Micky Maus comics from the time period. Both the German and British comics were often translated to provide content for other countries (although Italy's Più and Magic Boy magazines provided some original material, as did various South American publishers, notably Estrela and Editora Abril in Brazil). In addition, a few promotional comics and mini comics were also produced by Mattel for various European department stores, often featuring reworked versions of existing comic stories, with few exceptions. Masters of the Universe and the Princess of Power featured in many children's books from the 1980s, with one of the main producers of these titles, Golden Books, publishing several series of hard and softcover children's books from 1983 to 1986. The first few releases of the Golden books material is more in line with the early Mattel mini comics, with the later books following the Filmation cartoon series. New elements were also introduced by Golden Books, notably the character of Goat-Man in the book Secret of the Dragon's Egg in 1985. World I.P. also produced annual Masters of the Universe and Princess of Power storybooks in the UK from 1984 until the New Adventures line in 1990. Most World I.P. storybooks would loosely follow the established Filmation continuity, although the 1984 annual edition was written in a pre-Filmation style, naming prominent characters Orko and King Randor as "Gorpo" and "King Miro," respectively. Euredif France produced several Maîtres de l'Univers volumes as well, almost all of them directly based on various episodes of Filmation's He-Man and the Masters of the Universe series. Also notable in the 1980s were the various combination book, record, and cassette tape read-along adventure stories. These included many small hardcover book and cassette tapes produced by Ladybird Books out of the UK, several record and tape read-along book sets from Kid Stuff Records in the U.S., and two book and audio adventures by Mattel, packed in with a rare action-figure two-pack and with the Point Dread and Talon Fighter playset. Several video game adaptations of the franchise were released from 1983 through to 1987. Masters of the Universe: The Power of He-Man was released by Intellivision for Atari 2600 and Intellivision in 1983. Two games, Masters of the Universe: The Arcade Game and Masters of the Universe: The Super Adventure, were developed by Adventure Soft and released by U.S. Gold for Amstrad CPC, BBC Micro, Commodore 64, and ZX Spectrum in 1987, although the Commodore 64 version of Masters of the Universe: The Arcade Game was retitled Masters of the Universe: The Ilearth Stone. A video game based on the 1987 live-action movie, Masters of the Universe: The Movie, was released by Gremlin Graphics for Amstrad CPC, Commodore 64, MSX, and ZX Spectrum also in 1987. Additionally, various Masters of the Universe board games were released throughout the 1980s, and role-playing game publisher FASA produced The Masters of the Universe Role Playing Game in 1985 with sets of die-cast miniatures created by Grenadier Models. Throughout the 1980s, a wide array of He-Man merchandise was released, including coloring books, activity books, Panini Sticker books, toothbrush holders, costumes, bed sheets, and many other items. Several read-along audio plays were created by Kid Stuff and by Pickwick/Ladybird in the United Kingdom. Notably, a complete Masters of the Universe audio-play adventure LP record was released by Kid Stuff Records in 1983, written and produced by John Braden, with a new He-Man theme song and original voice acting. Also notable were a series of audio cassettes, released in Germany by Europa, consisting of 37 episodes of more than 40 minutes in length, with an additional 10 Princess of Power tapes, and six specials. These cassettes would continue to add to the expanding Masters of the Universe mythos, introducing the world of Anti-Eternia, with an evil alternate universe version of He-Man. Home video releases of Filmation's animated series were produced by RCA/Columbia on VHS and Betamax for 11 volumes with red framed box art, before switching to their Magic Window brand with The Secret of the Sword movie in 1985, for 12 additional He-Man and the Masters of the Universe volumes and 10 She-Ra: Princess of Power VHS releases. Golden Books, Germany's Ocean and Select, and various others also released Masters of the Universe video content in the 1980s. A Masters of the Universe "Power Tour" live stage show toured across the United States and Canada in 1987, with 19 consecutive performances at New York's Radio City Music Hall. Directed by Tony Christopher, husband-and-wife team Jack and Leslie Wadsworth portrayed He-Man and She-Ra, while Khalos Planchart and Eric Van Baars played lead villains Hordak and Skeletor, respectively. The production also featured lesser used characters such as Rio-Blast, Clamp-Champ, Snout-Spout, Rokkon, Ninjor, Blast-Attak, and songs by an original character, Songster (performed by Doug Howard). In 1987, a live-action He-Man film was made by Cannon Films entitled Masters of the Universe, released in the United States on August 7, 1987. The film was directed by Gary Goddard and starred Dolph Lundgren in the title role of He-Man, Frank Langella as Skeletor, with Courteney Cox, Robert Duncan McNeill, and James Tolkan in supporting roles (as Julie Winston, Kevin Corrigan, and Detective Lubic, respectively). The other characters from the original cartoon to appear in the film are Evil-Lyn (Meg Foster), Man-At-Arms (Jon Cypher), Teela (Chelsea Field), Beast Man (Tony Carroll), and the Sorceress (Christina Pickles). A new character, Gwildor (Billy Barty), is included in place of Orko, as the special effects of the time were deemed insufficient and too costly. Skeletor's henchmen Blade (Anthony De Longis), Saurod (Pons Maar), and Karg (Robert Towers) were also introduced, in place of other more familiar villains from the established continuity, such as Tri-Klops, Mer-Man, and Trap Jaw. In the film, Skeletor has finally conquered Eternia after stealing the Cosmic Key from the locksmith Gwildor, allowing him to gain entry into Castle Grayskull and imprison the Sorceress. The heroes He-Man, Man-At-Arms, and Teela are joined by Gwildor and escape to the planet Earth using Gwildor's prototype Cosmic Key. Stranded on Earth, they are faced with the task of retrieving their Cosmic Key (which has fallen into the hands of the unwitting humans Julie Winston and Kevin Corrigan) and returning to Eternia, before Skeletor can gain the full power of Castle Grayskull. Skeletor sends his minions to Earth with the mission of recovering the Cosmic Key prototype, as the war between good and evil is transferred to Earth, before returning to Eternia for a final battle between He-Man and a golden-clad godlike Skeletor in the film's climax. Numerous parts of the previously accepted history of the series are omitted in the film, including all references to Prince Adam, Battle Cat, Orko, King Randor, and Queen Marlena. Many reviews of the motion picture criticized its departures from the cartoon, although the movie was produced as an adaptation of the toys only, with Filmation having no involvement in the film. It is also implied that Castle Grayskull itself is the ruling point of Eternia rather than any royal city. The story concentrates more on the science-fiction elements of the franchise rather than the fantasy and the majority of the story takes place on Earth rather than on the world of Eternia. Also departing from all other depictions, He-Man uses a gun in some scenes, instead of his Power Sword, and he is rarely shown displaying his superhuman strength in the film. Although He-Man twice utters his catchphrase "I have the power!" while holding the sword aloft in the iconic manner, he does omit the prefacing clause "By the power of Grayskull." The film was a critical and commercial failure, and received generally negative reviews from critics. Although Mattel had hoped that the movie would boost sales of the toy line, it instead had little effect on the line's falling sales, and the MOTU toy line was finally discontinued in early 1988 under mounting financial difficulties. A sequel to the film was written, but by 1989 Cannon Films was in such severe financial troubles that it could no longer afford to pay the license fees to Mattel. Due to film's poor reception, thus the script was transformed into the action film Cyborg, starring Jean-Claude Van Damme. In 1990, a couple of years after the ending of the original Masters of the Universe product line, a second He-Man animated series titled The New Adventures of He-Man was created by Jetlag Productions to promote Mattel's short-lived attempt to revive the MOTU brand with a new toy line, simply titled He-Man. The new series is radically different from the original fantasy-oriented milieu, shifting to an almost purely science-fiction setting that sees He-Man transported to the futuristic planet of Primus. He-Man (with a new, more slender appearance and sporting a ponytail; voiced by Doug Parker) leads the heroic Galactic Guardians; while Skeletor (also with a completely new look; voiced by Campbell Lane), bases himself on the mutant world of Denebria, forming an alliance with Flogg and his band of Evil Mutants, who are hellbent on conquering Primus for themselves. The series contains continuity links to the original Masters of the Universe and was intended as a continuation of the existing mythology, although some fans see it as a separate canon from the original series due to the differences in style and character portrayal. Other than He-Man and Skeletor, the Sorceress of Castle Grayskull is the only character from the original series to make regular appearances in the new series, acting as a spiritual guide to He-Man from afar. Other established characters featured in the pilot episode, "A New Beginning," include King Randor and Queen Marlena, who finally learn of the dual identity of Prince Adam and He-Man. Teela also makes a later appearance in the series in the episode "Once Upon a Time," although she bears little resemblance to her former Filmation counterpart. Main characters introduced in this series are He-Man's new allies: the wise sage Master Sebrian, his assistant Mara, and the lead Galactic Guardians Captain Hydron and Flipshot. Other frequently appearing heroic characters include the young shepherd girl Drissi, her little brother Caz, the scientists (Alcon, Gepple, Krex, and Meldoc), the robots Gleep and UR, Grot the gardener, councilman Werban, the cyclops Meliac, and the remaining Galactic Guardians: Sagitar, Tuskador, Spinwit, and Artilla; with the final members Kayo, Vizor, and Nocturna rarely featuring in the show (although they did appear in the comics and series intro). Skeletor's allies in Flogg's band of Evil Mutants consist mainly of Flogg's incompetent second-in-command Slush-Head, Skeletor's new love interest Crita, and other mutants such as Quakke, Staghorn, B.H., Hoove, Karatti, Optik, and Lizorr. The New Adventures of He-Man cartoon series first aired September 17, 1990, lasting 65 episodes, until the episode "The Final Invasion," which aired on December 14, 1990, and, unlike Filmation, did provide some closure to the series. The majority of the cartoon episodes were written by Jack Olesker, resulting in a somewhat tighter continuity than the prior series. The He-Man toy line, debuting in 1989, a year earlier than the animated series, featured four waves of action figures (produced in slightly smaller scale to the previous line); totaling 28 distinct figures in all, with seven vehicles, two playsets, and two accessory items. Neither The New Adventures animated series or toy line proved nearly as popular as the originals, and the line ended with little fanfare in 1992. The New Adventures of He-Man series was also featured in its own series of four mini comics and in a monthly comic magazine entitled He-Man Adventure, which ran for about six issues, before returning to adventures on Eternia and was published by Egmont's London Editions Magazines in the UK; World I.P. also produced a New Adventures–themed annual in 1990. These publications differed somewhat from the animated series with the addition of the character Darius (who did not appear in the cartoon series) in a major role as leader of the Galactic Council; the transition of the "Power of Castle Grayskull" into the Starship Eternia; and several of the figures sporting alternate names in some media and toy-line releases, such as Flipshot as Icarius, Flogg as Brakk, and Slush-Head as Kalamarr. The Masters of the Universe franchise would not produce any new media for over a decade, although a new series was pitched by Lou Scheimer to DIC Entertainment in 1996. The series was to feature He-Ro (alter-ego Dare), now the son of He-Man, as a sequel to the original animated series, but remained unproduced. During this hiatus, Masters of the Universe also began a following on the early days of the internet, with sites developed by Kevin Herbert (one of the first), Adam Tyner (with the Scrolls of Grayskull newsletter), Busta-Toons (with focus on the Filmation animated series), and many others; eventually ending up with the expansive He-Man.org site being created. Various popular internet memes were also created, with Masters of the Universe being reviewed by popular YouTube channels and parodies such as Unemployed Skeletor or Wil Wheaton's "Skeletor Reads Angry Tweets" segment. Masters of the Universe would also appear many times on the Adult Swim stop-motion comedy series Robot Chicken (which introduced comedic character Mo-Larr). Both He-Man and Skeletor are often mentioned in pop culture, as seen on the long-running animated series The Simpsons on a few occasions. In 2000, however, Mattel did act on the growing nostalgia for the 1980s action figures by rereleasing replicas of many of the figures, under the banner of the Masters of the Universe Commemorative line. BCI Eclipse LLC (and later Mill Creek Entertainment) would expand on this, later releasing all episodes of the Filmation He-Man and the Masters of the Universe on DVD in Region 1 in 2005/2006; followed by She-Ra: Princess of Power and JetLag's New Adventures of He-Man series. Each volume contained an extensive array of special features, including original documentaries produced for the DVD set that featured interviews from many series creators and writers such as Lou Scheimer, Larry DiTillio, Paul Dini, and others. On April 25, 2022, the complete series was released for the first time on DVD in the UK by Fabulous Films. In 2002, Mattel launched a new Masters of the Universe toy line with sculpts designed by the Four Horsemen. The new toy line was made surprisingly faithful to the original line, with the characters gently "reimagined" and updated in terms of sculpting detail rather than radically reinterpreted. Sixty action figures were released in all, with 10 creature figures, seven vehicles, and three playsets (eight smaller-scale figures were also produced in a McDonald's Happy Meal promotion). One point of contention for many fans of the original Masters toy line was the redesign of He-Man's Power Sword. According to Four Horsemen, this was due to their original re-sculpts being intended for a continuation of the original storyline in which Skeletor had obtained both halves of the Power Sword (hence the new Skeletor figure's dual blades with clear "good" and "evil" hilt designs), necessitating a new sword to be built by Man-At-Arms and endowed with the properties of the original by the Sorceress. However, Mattel decided to reboot the continuity for a new generation of children, and thus the "new" Power Sword design became the "original" version for the new continuity. Another issue was the overreliance on releasing alternate versions of He-Man (13 in total), Skeletor (10), Man-At-Arms (5), and a few other main characters, rather than further classic, reimagined, and original characters from the accompanying animated series (such as Randor, The Sorceress, Clawful, or Chief Carnivus, to name a few); making many of the non-He-Man or Skeletor figures hard to come by for both collectors and children. These factors likely contributed to the cancelation of the line in 2004 and ultimately not achieving the success of its 1980s counterpart. The line's faithfulness to the original series made it very popular with collectors, however, suggesting it would have been better served as a collector-based line, akin to DC Direct. This theory was borne out in the wake of the discontinuation of the mass-market toy line, with NECA taking the rather unprecedented step of continuing the toy line through action-figure-size mini-statues scaled and sculpted to be aesthetically compatible for display alongside the Mattel toys. NECA would produce 22 "staction figures" in total, allowing fans to fill in their collections with other Four Horsemen redesigned characters that had yet to be produced as figures when the toy line was canceled. According to a December 8, 2005, interview with a Mattel representative on he-man.org, NECA offered to produce fully articulated action figures for Mattel without taking any credit, but permission was denied. Instead, NECA was only permitted to produce non-articulated statues, which they did from 2005 to 2007. A new animated series was produced to accompany the toy line, made by Mike Young Productions and lasting for 39 episodes, with the series making its premiere on Cartoon Network's Toonami on August 16, 2002, and airing its final episode on January 10, 2004. This series involved much tighter continuity and a somewhat greater depth of characterization than its Filmation predecessor. A similar but slightly modified premise to the original Filmation series, this version of He-Man (voiced by Cam Clarke, with Prince Adam portrayed as physically younger and smaller than He-Man) was part of an ensemble of Eternian heroes/protectors known officially as "The Masters of the Universe". Under the leadership of Man-At-Arms (voiced by Garry Chalk), this team originally consisted of He-Man/Adam (with his pet Cringer/Battle Cat, no longer able to speak), Teela, Orko, Stratos, Ram-Man, Mekaneck, and Man-E-Faces, and later joined by Buzz-Off, Roboto, and Sy-Klone. King Randor was now a general (rather than king, from an Eternian royal lineage), pronounced ruler of Eternia by the Elders of the Hall of Wisdom, which have gone into hiding inside the depths of Castle Grayskull. Skeletor (voiced by Brian Dobson), now confirmed as Randor's brother Keldor, finally breaks through the great barrier wall (after decades of trying) and attacks The Masters with his evil forces, mainly consisting of Evil-Lynn, Beast-Man, Mer-Man, Trap-Jaw (now a cybernetically repaired henchman, formerly known as Kronis), Tri-Klops (now an inventor/scientist, somewhat akin to an evil Man-At-Arms), Claw-ful (now a very large and extremely dim-witted thug), and Whiplash (now also of larger size and of the subterranean Caligar race). Backstories of occasional characters such as Fisto, Moss-Man, Webstor, Zodak (regarded a different character as opposed to the earlier Zodac), Two-Bad (portrayed as two bounty hunters known as Tuvar and Baddhra, magically combined into one being by Skeletor's magic), and Stinkor (finally making an appearance in cartoon continuity as the mutated form of Odiphus) are all expanded upon. On-and-off villains Count Marzo and Evilseed return, while new characters such as Dekker, Carnivus, Ceratus, Lord Dactys, Prahvus, the Faceless One, and the giants Chadzar, Belzar, and Azdar are also introduced in this series. The series was originally title He-Man and the Masters of the Universe like the original 1983 series, being retitled Masters of the Universe vs. the Snake-Men towards the end of the first season, in addition sidelining Skeletor as chief villain in favor of King Hiss, leader of the reptilian Snake Men (Kobra-Kahn, General Rattlor, Tung-Lashor, Snake-Face, and Sssqueeze), with He-Man and many of the characters now bearing a new "Snake-Armor" look. He-Man's ancestor King Grayskull and his Sorceress wife Veena also debuted in this season against his nemesis Hordak (now an ancient sorcerer). Hordak and the Evil Horde were to be the main antagonists for the third season if the show had continued, but it was not renewed. The 40th and final episode was produced as a comic-book "special feature" on the last DVD set of the series, which was part of a three-volume release, originally by BCI Eclipse in 2008 (and later in a collected release by Mill Creek Entertainment in 2009 and 2012). A game based on the second Masters of the Universe series, titled He-Man: Power of Grayskull, was developed by Taniko and published by TDK Mediactive in October 2002 for the Game Boy Advance, which also featured an introductory mini comic. A follow-up developed by Savage Entertainment and published by Midas Interactive Entertainment, He-Man: Defender of Grayskull, was released for PlayStation 2 in February 2005. From 2002 to 2005, Image Comics and MVCreations published several series of comics and one-shots that mirrored tales of Masters of the Universe; the comic series elaborated and added to the mythos by introducing characters that never appeared in the 39 episodes of the television series. The first issues were seen in the summer of 2002 in the form of special promotional/preview issues, with three miniseries continuing on after: "The Shards of Darkness" in fall 2002, followed by "Dark Reflections" and "Rise of the Snake Men" in 2003. After delving into the backstories of Skeletor's henchmen Beast-Man, Mer-Man, Trap-Jaw, and Tri-Klops in a four-issue "Icons of Evil" series, a short-lived ongoing series, solely produced by MVC, continued on for eight issues in 2004. Along with these, a handful of special or "pack-in" one-shots and trade paperback collected volumes were also produced. In 2007, a new incarnation of Masters of the Universe was announced, with the first action figure, King Grayskull, released at San Diego Comic-Con in 2008. Based on the look of the original 1980s MOTU toys, this new toy line was aimed primarily at the adult toy collector market with a 6" scale, and were often available only through subscriptions (from MattyCollector). Sculpted by the Four Horsemen, these toys were updated versions of previous figures, as well as characters that never before had an action figure made of them, such as Filmation's Queen Marlena, Fang-Man, Lizard-Man, Count Marzo, Granamyr, and many others. The toy line featured many redesigned and updated action figures from the original action-figure line from the 1980s, but it also included characters from She-Ra: Princess of Power (Adora, Madame Razz, Scorpia, Shadow Weaver, and others), The New Adventures of He-Man (Mara, Crita, and more), and the Mike Young Productions series from 2002 (Faceless One, Chief Carnivus, King Chooblah, Ceratus, and others). As the line progressed, characters from all versions of MOTU lore were included, from such things as prototypes and concept art (He-Ro, Eldor, Demo-Man, Gygor, Vykor, and others), box art from vehicles and model kits (Sky High and the Fighting Foe Men), mini comics (the Goddess, Geldor, and Procrustus), and other books, comics, and media (Despara, Strobo, Goat-Man, and more). There were also newly created figures, exclusive to the Classics toy line, such as Draego-Man, Cy-Chop, Castle Grayskullman, and others. Figures were also released in two-packs with corresponding Superheroes and villains from the DC Comics Universe. Masters of the Universe Classics surpassed the original 1980s toy line in terms of length, running continuously for seven years with more than 150 different figures produced following its launch in August 2008. In 2016, Mattel ended production on the MOTU Classics and MattyCollector.com's Club Grayskull series, with the production company Super7 taking over the Masters of the Universe license; though Super7 would continue the series. Super7 produced several 3¾" figures (in the style of the classic Kenner Star Wars action figures from the late 1970s to early 1980s) and many figures in the style of the small pink M.U.S.C.L.E./Kinkeshi toylines also from the 1980s. Super7's releases included figures from their animation special The Curse of the Three Terrors, followed by the Masters of the Universe "Ultimates" line (which consisted of "deluxe" re-releases of Classics figures) and a continuation of the prior Classics and Club Grayskull lines. Super7 also produced retro figures in the form of the original 1980's line in 5½-inch scale; which included many 'Filmation' styled versions of the vintage figures, along with unreleased figures such as He-Ro and Eldor. Super7's final addition to the MOTU Classics toyline was a 'made to order' exclusive Snake Mountain playset in 2020. In addition to the toylines, starting in 2012, Dark Horse Comics produced mini comics included in Mattel's Masters of the Universe Classics line of toys, continuing the series of mini comics first introduced in the original MOTU toys of the 1980s. The initial three mini comics were written by Tim Seeley and drawn by Wellinton Alves, with covers by Eric Powell. The Dark Horse mini comics create a new story set in the "Classics" timeline, but base the first issue on "The Powers of Grayskull" minicomic from the 80s, re-telling it to some degree, before venturing into the new Classics stories not related to original vintage concept. In these issues, He-Man goes back in time to battle King Hiss, finally bringing He-Ro, Eldor, Tytus, and Megator into the storylines and introducing newly created Classics characters such as Sir Laser-Lot and the Mighty Spector. Seeley stated that these comics were intended to blend the different He-Man continuities and select the best stories and ideas from MOTU history. DC took over the Masters of the Universe Classics mini comics from Dark Horse in 2013, publishing five more mini comics, with stories from Scott Neitlich and artwork by Wellinton Alves and Axel Giménez. These mini comics provide an origin story of Keldor (Skeletor), and then proceed to join into the later New Adventures of He-Man continuity. The Fall of Eternia saga in the final issues incorporates the proposed Dare, son of He-Man (He-Ro II) series from the 1990s, along with Gorpo (the Unnamed One) and many "Create-a-character" contest finalist designs from the 1980s Masters of the Universe Magazine. Many of these stories are meant to be read in conjunction with the altered continuity presented in the character biographies on the cardbacks of the Masters of the Universes Classic's line action figure packaging, and thus do not provide a detailed flowing narrative in the mini comics themselves. The 8th and final mini comic of this series was published in 2015. A Masters of the Universe comic book series was relaunched by DC Comics in 2012, first appearing as a series of digital comics. This was quickly followed by a six-issue mini-series and all new revised origin issues for He-Man, Skeletor and Hordak. After a crossover mini-series with superheroes from the DC Comics universe in 2013, an ongoing series ran for 19 issues through 2014, before being replaced by the "He-Man The Eternity War" 15-issue series in 2015/2016. This introduced a new backstory for He-man's sister She-Ra (as Despara), Skeletor (as the half-Gar son of King Miro), Hordak, and the Snakemen; moving the storyline further along, with a new Horde invasion of Eternia and He-Man taking the Eternian throne, amongst other new developments. Later DC/Mattel produced He-Man/ThunderCats, a crossover with another heroic 1980s action figure line, ThunderCats, was also produced for six issues in 2016–2017 and a six-part crossover series with DC Comics' "Injustice" storyline was released in 2018. These two crossovers were not part of the earlier 2012-2016 DC Comics MOTU canon. The final DC Comics MOTU property was 'He-Man and the Masters of the Multiverse', which began in November 2019, with a six issue limited series, written by Tim Seeley. This used elements from various sources in MOTU lore, vintage minicomics, '87 movie, filmation, 2002 series as well as references to "Eternity War" story arc. Current properties and recent franchise history On December 12, 2017, DreamWorks Animation SKG and Netflix announced a new reboot series based on She-Ra Princess of Power series from the 1980s. The series was executive produced by award-winning author, ND Stevenson (creator of Nimona and Lumberjanes). The series' first season of thirteen episodes was released on Netflix November 13, 2018. The DreamWorks series features a new animation style and alternate backstories for many of the characters, many of whom are presented as younger in age and with a more diverse makeup than in the previous 1980s Filmation series. Adora/She-Ra is again presented as a former member of the Horde, befriended by re-imagined versions of Glimmer and Bow (with new voice actors Aimee Carrero, Karen Fukuhara and Marcus Scribner, respectively). Under the direction of Glimmer's mother Queen Angella of Bright Moon, the three embark upon re-uniting the Princesses of Etheria, which include Perfuma, Mermista, Entrapta and Frosta, each with re-imagined characters as well. Also appearing in the series are Swift Wind (without the alter ego of Spirit and with a completely different take on the character's personality), Light Hope (as a female hologram generated by the "First Ones"), Sea Hawk (now presented as a more comical glory-seeking associate of Mermista), Castaspella (as the sister of Angella's husband King Micah), Madame Razz (as an older and confused forest dweller with knowledge of Mara, a prior "She-Ra"), Netossa and Spinnerella. The evil Horde returns as the villainous overlords of Etheria, and although Hordak remains leader of the Horde, Catra is often presented as the primary antagonist (now voiced by AJ Michalka), with a much stronger relationship established between her and Adora. Shadow Weaver (Lorraine Toussaint) and Scorpia (Lauren Ash) also play prominent roles within the series, and cadets Lonnie, Rogelio and Kyle are introduced (possibly inspired by previous Filmation characters). Overarching galactic villain Horde Prime and a re-imagined shape-shifting Double Trouble enter the series in later seasons, and other previously established villains appearing in lesser roles are Admiral Scurvy, Tung Lashor, Grizzlor, Imp and Octavia. Although no longer directly linked to He-Man or the Masters of the Universe, Eternia, Castle Grayskull and Adora's kidnapping as a child are referenced. Season two of She-Ra and the Princesses of Power was released on Netflix on April 26, 2019, with a shorter seven-episode run; soon followed by season three, on August 2, and season 4, on November 4 of that same year. While firmly establishing a new continuity, these seasons make further connections to previously established lore and characters, and include Geena Davis voicing the role of Huntara in season three. The series aired its fifth and final season on May 15, 2020. Several dolls, chapter books and graphic novels were also released in relation to this series in 2019 and 2020. In August 2019, Kevin Smith announced at the 2019 Power Con that he and Netflix were developing a new series titled Masters of the Universe: Revelation that was proposed to be a direct sequel to the original He-Man and the Masters of the Universe animated series. On February 14, 2020, the full voice cast was confirmed, which included Mark Hamill providing the voice for Skeletor, Chris Wood voicing Prince Adam and He-Man, Sarah Michelle Gellar as Teela, and Lena Headey as Evil-Lyn. The series features many characters never before seen in animated form, such as Scareglow, Blast-Attak, Andra and He-Ro; incorporating a wide range of Masters of the Universe lore over its long history and varied incarnations. The first 5 episodes made its debut on Netflix on July 23, 2021, with the remaining 5 releasing on November 23, 2021. In June 2022, during Netflix's Geeked Week 2022, a sequel to the series titled Masters of the Universe: Revolution was announced. The Revolution series premiered on Netflix in 2024. In December 2019, it was announced that in addition to their other series, Netflix would be developing a new Masters of the Universe series using CGI animation. Rob David developed the series, producing it alongside Adam Bonnett, Christopher Keenan, Jeff Matsuda and Susan Corbin, while Bryan Q. Miller will served as story editor on the series. Animation services were provided by House of Cool and CGCG Inc. Aimed at a younger audience, the series featured an updated storyline and a new stylized take on the characters and the world of Eternia. It ran for three seasons from September 2021 to August 2022, and was accompanied by a toyline from Mattel. On February 13, 2024, it was reported that Travis Knight was in final talks to direct the film. On May 1, 2024, it was officially confirmed that Knight would direct the film for Amazon MGM Studios and Mattel Films. A theatrical release of June 5, 2026 was also revealed. ParaNorman director Chris Butler would be writing the screenplay, following initial drafts written by Callaham and the Nee brothers. Mattel Films' Robbie Brenner, Escape Artists' Todd Black, Jason Blumenthal and Steve Tisch are producing the film. The film will depict a ten-year-old Prince Adam as he crashes on Earth, separating him from his Power Sword; he would eventually retrieve the sword and take on the mantle of He-Man two decades later as he battles for his home planet, Eternia, against the evil forces of Skeletor. On May 29, 2024, it was announced that Nicholas Galitzine was cast as He-Man. On August 15, 2024, Camila Mendes was cast as Teela. On September 4, 2024, Alison Brie was cast as Evil-Lyn. On November 23, 2024, Idris Elba was cast as Man-at-Arms. On December 20, 2024, it was announced that Jared Leto is cast as Skeletor along with his coterie with Sam C. Wilson as Trap Jaw, Kojo Attah as Tri-Klops and Hafthor Bjornsson as Goat Man. Since 2007, a reboot of Masters of the Universe has been in the works but has gone through development hell with various studios, directors and writers connected to the project. Variety reported in 2007 that Grayskull: Masters of the Universe would be produced by Joel Silver, and written by Justin Marks, and employing visual special effects to a large degree, as was done with the 2007 war film 300. With that deal to reboot the film going nowhere, Warner Bros. announced that John Stevenson, director of Kung Fu Panda, was slated to direct the upcoming feature. On May 12, 2009, it was announced that the scripting duties had been handed to newcomer Evan Daugherty, with John Stevenson still attached to direct. In September 2009, Sony took over the rights from Warner Bros. to produce the Masters of the Universe live-action film after Mattel and Silver couldn't agree on creative direction for the film. Sony and Escape Artists' Todd Black, Jason Blumenthal and Steve Tisch were now developing the project from scratch for Columbia. In April 2010, Sony hired screenwriters Mike Finch and Alex Litvak to draft a new script. Deadline reported that Jon M. Chu was in talks to direct the film. Original He-Man actor Dolph Lundgren did an interview with IGN about possibly appearing in the film as King Randor. On October 12, 2012, Richard Wenk was hired to rewrite the script for the film. On March 28, 2013, Chu said that the film was still early in its development and that it would not be campy, but rather a dramatic origin story. On October 7, 2013, The Hollywood Reporter reported that Terry Rossio would write the film; Todd Black, Jason Blumenthal, and Steve Tisch were assigned to produce it. The film would be set on Eternia. The site also reported that Chu would not direct the film. On February 26, 2014, it was reported that directors Jeff Wadlow, Mike Cahill, Harald Zwart, and Chris McKay were on the short list to direct the film. On April 9, 2014, Schmoes Know reported that Wadlow would direct the film, but The Hollywood Reporter announced that he was merely rewriting the script. Columbia Pictures Senior Vice President DeVon Franklin tweeted that Jeff Wadlow had completed the script. Franklin later tweeted a photo on his Twitter page of Battle Cat. On August 19, 2015, Variety reported that Christopher Yost would rewrite the script. Mike O'Hearn announced on his Instagram account that he was in training to star as He-Man. However, he then quashed the rumor, saying he only wanted to do the part and was not cast for the live-action movie. On January 22, 2016, Deadline reported that McG would direct the film and also oversee a rewrite of the latest script by Alex Litvak and Mike Finch, while Escape Artists' Todd Black, Jason Blumenthal and Steve Tisch and as well as DeVon Franklin were now on board as producers. On June 24, 2016, Kellan Lutz tweeted on his Twitter page that he had a meeting with both McG and Mary Viola about taking the role of He-Man. McG told IGN that the role of He-Man had not been cast yet, but that Lutz was being looked at very closely for the part. This draft of the script would be set on Eternia, but not exclusively there. In addition, pre-production had moved on to doing makeup testing. McG commented on the film saying, "I think we want to honor the fan base, first and foremost, We also need to be cognizant of the incredible resonance of what Kevin Feige is doing with Marvel, and the balance of full-bodied entertainment. That it's both credible and emotional, action-packed, and the story of a hero's journey. It's the genesis of He-Man, it's the becoming of He-Man. We want it to be clicking on all cylinders in that regard. We're not going to stop until we get it right." On April 26, 2017, Sony confirmed that the film would finally be released on December 18, 2019. Along with the release date confirmation it was announced that McG was no longer directing the film. During the search for his replacement, Entertainment Weekly reported that David S. Goyer had been brought in to write the script. In December 2017, further reports said that Goyer was in talks to direct the film; however, in February 2018 Variety reported that Goyer had decided to step away as director to focus on other projects, but stated he would remain on board as an executive producer and screenwriter, and that the studio was said to be very happy with the script he turned in and was currently meeting with potential replacements. In April 2018, another Variety report stated that Aaron and Adam Nee were set to direct the film. On January 11, 2019, Deadline reported that Art Marcum and Matt Holloway would rewrite a new draft for the film. Principal photography was originally scheduled to begin on July 15, 2019, and wrap on October 18, 2019, with Prague as one of the shooting locations. On February 13, 2019, it was reported that principal photography on the film would begin in mid-July 2019 in Prague. On March 20, 2019, it was reported that Noah Centineo was in talks to play He-Man. On April 29, 2019, Centineo, in an appearance on The Tonight Show Starring Jimmy Fallon, confirmed that he would be playing He-Man in the upcoming film. On May 16, 2019, Sony announced that the film's release date was changed to March 5, 2021. In October 2019, The Hollywood Reporter had reported a rumor that Sony would sell the movie to Netflix. On January 24, 2020, the film has been taken off its release schedule with the film adaptation of Uncharted, which also got its release date changed, taking its place before that film changed its release date again. On April 29, 2021, a representative for Centineo announced that he would no longer play He-Man in the film. On January 28, 2022, it was announced that Netflix had officially acquired the film from Sony and that Kyle Allen would now play He-Man. It was also revealed that David Callaham had written a new draft of the screenplay along with the Nee Brothers, while production was set to begin in 2023. On July 18, 2023, it was announced that Netflix has canceled the film but Mattel was looking for a new studio to buy the project. On November 13, 2023, it was announced that Amazon MGM Studios was in talks to acquire the film. On September 13, 2021, Amazon announced that a live-action She-Ra series is in development with DreamWorks Animation serving as an executive producer. The series will be a new, standalone story with no connections with Netflix's original animated series She-Ra and the Princesses of Power. It was announced that Nicole Kassell will direct the series and Heidi Schreck will serve as both a writer and executive producer. Mattel began producing Masters of the Universe action figures once again, debuting the Origins line at San Diego Comic-Con in 2019 with a Prince Adam and He-Man two-pack. The figures in the vintage 5.75" scale, but with more articulation, were designed to aspire to both adult collectors and children, with a retail release across the globe in 2020. The look of the playsets, vehicles and figures, along with the packaging is presented in the style of the original line from the 1980s and include all new mini-comics. The current selection includes He-Man, Skeletor, several of their allies, She-Ra, and several members of The Evil Horde. In 2024, Mattel released an action figure crossover line combining Origins with the Teenage Mutant Ninja Turtles franchise, titled Turtles of Grayskull, with accompanying minicomics created by Freddie E. Williams II. Serving as a successor to the Masters of the Universe Classics line in scale, and in conjunction with the Masters of the Universe Revelation Netflix series, a new line of premium Masters of the Universe Masterverse action figures debuted in 2021 and continues to be produced by Mattel. Along with the MOTU Classics series, MOTU Minis and Giants figures were produced from 2013 to 2015. Mattel would bring back the Minis line in 2020 with several waves of figures, multipacks and vehicles. Mega Construx would release Masters of the Universe themed building block figures and toys, beginning in 2017, including a Castle Grayskull set. Funko Pop has also produced Masters of the Universe themed characters since 2018. Masters of the Universe released a prequel comic series to the Masters of the Universe Revelation animated series on Netflix, with the first issue released on July 7, 2021. Dark Horse continues to produce Masters of the Universe comics, and featured a crossover with the Teenage Mutant Ninja Turtles, entitled 'Turtles of Grayskull'. Dark Horse Books continues to produce various hardcover anthology books with collaborative efforts from Val Staples, James Eatock, Josh de Lioncourt, Danielle Gelehrter, Eric Marshall, Jukka Issakainen, David Clark, Aidan Cross, Leanne Hannah and others. Volumes include the "Art of He-Man and the Masters of the Universe," "He-Man and the Masters of the Universe Minicomic Collection," "He-Man and She-Ra: A Complete Guide to the Classic Animated Adventures," "He-Man and the Masters of the Universe: The Newspaper Comic Strips", "He-Man and the Masters of the Universe: A Character Guide and World Compendium." and "The Toys of He-Man and the Masters of the Universe". Hardcover books featuring more recent Masters of the Universe properties have also been produced for the Masterverse and Origins toylines, as well the Revelation and 2021 animated series. Since 2019, Golden Books has also produced He-Man, She-Ra and Skeletor themed children's books in their Little Golden Books series. An Android and iOS game, He-Man: The Most Powerful Game in the Universe, was developed by GlitchSoft and published by Chillingo and Mattel in late 2012; later followed by He-Man™ Tappers of Grayskull for the iOS (which also includes an updated She-Ra's Adventure version). On April 26, 2022, Mattel released a Roblox version of the game titled He-Man and the Masters of the Universe: You have the Power. The company Ninja Kiwi added two Masters of the Universe themed cosmetics to their game Bloons Tower Defense 6, first a power named, "Battle Cat!" a skin for the hero Adora named, "She-Ra," and another power named "Sword of Protection."[citation needed] Masters of the Universe was featured in the third episode of the first season of the Netflix series The Toys That Made Us in 2017 and in 2018 with the release of the Power of Grayskull: The Definitive History of He-Man and the Masters of the Universe documentary, also on Netflix. Notes References External links |
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Contents URI normalization URI normalization is the process by which URIs are modified and standardized in a consistent manner. The goal of the normalization process is to transform a URI into a normalized URI so it is possible to determine if two syntactically different URIs may be equivalent. Search engines employ URI normalization in order to correctly rank pages that may be found with multiple URIs, and to reduce indexing of duplicate pages. Web crawlers perform URI normalization in order to avoid crawling the same resource more than once. Web browsers may perform normalization to determine if a link has been visited or to determine if a page has been cached. Web servers may also perform normalization for many reasons (i.e. to be able to more easily intercept security risks coming from client requests, to use only one absolute file name for each resource stored in their caches, named in log files, etc.). Normalization process There are several types of normalization that may be performed. Some of them are always semantics preserving and some may not be. The following normalizations are described in RFC 3986 to result in equivalent URIs: For http and https URIs, the following normalizations listed in RFC 3986 may result in equivalent URIs, but are not guaranteed to by the standards: Applying the following normalizations result in a semantically different URI although it may refer to the same resource: Normalization based on URI lists Some normalization rules may be developed for specific websites by examining URI lists obtained from previous crawls or web server logs. For example, if the URI appears in a crawl log several times along with we may assume that the two URIs are equivalent and can be normalized to one of the URI forms. Schonfeld et al. (2006) present a heuristic called DustBuster for detecting DUST (different URIs with similar text) rules that can be applied to URI lists. They showed that once the correct DUST rules were found and applied with a normalization algorithm, they were able to find up to 68% of the redundant URIs in a URI list. See also References |
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[SOURCE: https://en.wikipedia.org/wiki/Rainer_Weiss] | [TOKENS: 1613] |
Contents Rainer Weiss Rainer Weiss (/waɪs/ WYSSE, German: [vaɪs]; September 29, 1932 – August 25, 2025) was a German-American physicist, known for his contributions in gravitational physics and astrophysics. He was a professor of physics at the Massachusetts Institute of Technology and an adjunct professor at Louisiana State University. He is best known for inventing the laser interferometric technique which is the basic operation of LIGO. He was Chair of the COBE Science Working Group. In 2017, Weiss was awarded the Nobel Prize in Physics, along with Kip Thorne and Barry Barish, "for decisive contributions to the LIGO detector and the observation of gravitational waves". Weiss helped realize a number of challenging experimental tests of fundamental physics. He was a member of the Fermilab Holometer experiment, which uses a 40m laser interferometer to measure properties of space and time at quantum scale and provide Planck-precision tests of quantum holographic fluctuation. Early life and education Rainer Weiss was born in Berlin, Brandenburg, Prussia, Germany, on September 29, 1932, the son of Gertrude Loesner and Frederick A. Weiss. His father, a physician, neurologist, and psychoanalyst, was forced out of Germany by Nazis because he was Jewish and an active member of the Communist Party. His mother, an actress, was Christian. His aunt was the sociologist Hilda Weiss.[citation needed] His younger sister is playwright Sybille Pearson. The family fled first to Prague, but Germany's occupation of Czechoslovakia after the 1938 Munich Agreement caused them to flee again; the philanthropic Stix family of St. Louis helped them obtain visas to enter the United States. Weiss spent his youth in New York City, where he attended Columbia Grammar School. He studied at MIT, dropping out at the beginning of his junior year with the excuse that he had abandoned his coursework to pursue a romantic relationship with a music student from Chicago. While this affair was a contributing factor, Weiss's concurrent vacillation between MIT's engineering and physics tracks may also have played a significant role. Jerrold Zacharias, then an influential physicist and MIT professor, intervened, and Weiss, after working as a technician in Zacharias's lab, eventually returned to receive his S.B. degree in 1955. He would complete his PhD in 1962, still with Zacharias as advisor/mentor. Career Weiss taught at Tufts University from 1960 to 1962, was a postdoctoral scholar at Princeton University from 1962 to 1964, and then joined the faculty at MIT in 1964. For Weiss's initial work at MIT, he started a group studying cosmology and gravitation. Needing to develop new technology, particularly in regards to the stabilization of equipment set to measure minute fluctuations, his lab included machine and electronics shop, with a hands-on expectation of his students for fabrication and design. By 1966, Weiss's tenure at MIT was at risk because of the failure of his group to produce publications. On advice from Bernard Burke, then head of the division on astrophysics in the Physics Department, Weiss recalibrated his standards for submitting articles for publication, eventually finding grounds for publication that he believed met his personal standards as scientifically worthy and publishable. He was then able to qualify for tenure and remain at MIT. That same year Joseph Weber claimed to have invented a way to detect gravitational waves. When Weiss’s students asked him about Weber’s work, he was unable to explain it to them, as it seemed to contradict his understanding of general relativity. In 1967, to illustrate the principle of gravitational wave detection in a simpler way, Weiss devised a thought experiment involving time of flight measurements of light between free masses in space, which in principle required “impossibly precise clocks”. About a year later, as Weber’s claims remained unconfirmed, Weiss started to realize that maybe Weber was wrong. He eventually revisited his idea and replaced the clocks with laser interferometry and concluded that such an approach could realistically detect gravitational waves, at sensitivities beyond what Weber’s resonant bars could achieve. In 1973, Weiss was forced to pivot with his work as the US military cut funding for any science that was not determined to be "directly relevant to its core mission." Weiss wrote a proposal to the NSF that described "a new way to measure gravitational waves." This was the work that would eventually lead to his 2017 Nobel Prize, though it was many years before the interferometers Weiss and his students built were sensitive enough to actually detect gravitational waves, making for numerous unpleasant doctoral thesis defenses where Weiss's graduate students were unable to present positive (in layman's terms: any) results. Weiss proposed the concept of LIGO to Kip Thorne in 1972, but it took three years before Thorne was convinced it could work. After the study of prototypes at MIT, Caltech, Garching, and Glasgow, and Weiss's estimates what it would take to build a full scale interferometer, Caltech and MIT signed an agreement about the design and construction of LIGO in 1984, with joint leadership by Ronald Drever, Weiss, and Thorne. In a 2022 interview given to Federal University of Pará in Brazil, Weiss talks about his life and career, the memories of his childhood and youth, his undergraduate and graduate studies at MIT, and the future of gravitational waves astronomy. Achievements Weiss brought two fields of fundamental physics research from birth to maturity: characterization of the cosmic background radiation, and interferometric gravitational wave observation. In 1973 he made pioneering measurements of the spectrum of the cosmic microwave background radiation, taken from a weather balloon, showing that the microwave background exhibited the thermal spectrum characteristic of the remnant radiation from the Big Bang. He later became co-founder and science advisor of the NASA Cosmic Background Explorer (COBE) satellite, which made detailed mapping of the radiation. Weiss also pioneered the concept of using lasers for an interferometric gravitational wave detector, suggesting that the path length required for such a detector would necessitate kilometer-scale arms. He built a prototype in the 1970s, following earlier work by Robert L. Forward. He co-founded the NSF LIGO (gravitational-wave detection) project, which was based on his report "A study of a long Baseline Gravitational Wave Antenna System". Both of these efforts couple challenges in instrument science with physics important to the understanding of the Universe. In February 2016, he was one of the four scientists of the LIGO/Virgo collaboration presenting at the press conference for the announcement that the first direct gravitational wave observation had been made in September 2015.[a] Kip Thorne described Weiss as "by a large margin, the most influential person this field [the study of gravitational waves] has seen." According the Nobel Prize website, Weiss received one half of the 2017 Nobel Prize for Physics prize money share, while his LIGO colleagues and co-winners Barry Barish and Kip Thorne only received one quarter of it. Personal life and death Classical music was a profound influence and shaping force in Weiss's life, from his early youth in an immigrant family,[clarification needed] through his shared love of Beethoven's Spring Sonata, which cemented his deep personal relationship with mentor Jerrold Zacharias. He married and had his first child while still in graduate school, "the best time of my life." He was married to Rebecca Young from 1959 until his death, and they had two children. Weiss died at a hospital in Cambridge, Massachusetts, on August 25, 2025, at the age of 92. Honors and awards Weiss has been recognized by numerous awards including: Selected publications Notes See also References Further reading External links |
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[SOURCE: https://en.wikipedia.org/wiki/Python_(programming_language)#cite_ref-classmix_20-0] | [TOKENS: 4314] |
Contents Python (programming language) Python is a high-level, general-purpose programming language. Its design philosophy emphasizes code readability with the use of significant indentation. Python is dynamically type-checked and garbage-collected. It supports multiple programming paradigms, including structured (particularly procedural), object-oriented and functional programming. Guido van Rossum began working on Python in the late 1980s as a successor to the ABC programming language. Python 3.0, released in 2008, was a major revision and not completely backward-compatible with earlier versions. Beginning with Python 3.5, capabilities and keywords for typing were added to the language, allowing optional static typing. As of 2026[update], the Python Software Foundation supports Python 3.10, 3.11, 3.12, 3.13, and 3.14, following the project's annual release cycle and five-year support policy. Python 3.15 is currently in the alpha development phase, and the stable release is expected to come out in October 2026. Earlier versions in the 3.x series have reached end-of-life and no longer receive security updates. Python has gained widespread use in the machine learning community. It is widely taught as an introductory programming language. Since 2003, Python has consistently ranked in the top ten of the most popular programming languages in the TIOBE Programming Community Index, which ranks based on searches in 24 platforms. History Python was conceived in the late 1980s by Guido van Rossum at Centrum Wiskunde & Informatica (CWI) in the Netherlands. It was designed as a successor to the ABC programming language, which was inspired by SETL, capable of exception handling and interfacing with the Amoeba operating system. Python implementation began in December 1989. Van Rossum first released it in 1991 as Python 0.9.0. Van Rossum assumed sole responsibility for the project, as the lead developer, until 12 July 2018, when he announced his "permanent vacation" from responsibilities as Python's "benevolent dictator for life" (BDFL); this title was bestowed on him by the Python community to reflect his long-term commitment as the project's chief decision-maker. (He has since come out of retirement and is self-titled "BDFL-emeritus".) In January 2019, active Python core developers elected a five-member Steering Council to lead the project. The name Python derives from the British comedy series Monty Python's Flying Circus. (See § Naming.) Python 2.0 was released on 16 October 2000, featuring many new features such as list comprehensions, cycle-detecting garbage collection, reference counting, and Unicode support. Python 2.7's end-of-life was initially set for 2015, and then postponed to 2020 out of concern that a large body of existing code could not easily be forward-ported to Python 3. It no longer receives security patches or updates. While Python 2.7 and older versions are officially unsupported, a different unofficial Python implementation, PyPy, continues to support Python 2, i.e., "2.7.18+" (plus 3.11), with the plus signifying (at least some) "backported security updates". Python 3.0 was released on 3 December 2008, and was a major revision and not completely backward-compatible with earlier versions, with some new semantics and changed syntax. Python 2.7.18, released in 2020, was the last release of Python 2. Several releases in the Python 3.x series have added new syntax to the language, and made a few (considered very minor) backward-incompatible changes. As of January 2026[update], Python 3.14.3 is the latest stable release. All older 3.x versions had a security update down to Python 3.9.24 then again with 3.9.25, the final version in 3.9 series. Python 3.10 is, since November 2025, the oldest supported branch. Python 3.15 has an alpha released, and Android has an official downloadable executable available for Python 3.14. Releases receive two years of full support followed by three years of security support. Design philosophy and features Python is a multi-paradigm programming language. Object-oriented programming and structured programming are fully supported, and many of their features support functional programming and aspect-oriented programming – including metaprogramming and metaobjects. Many other paradigms are supported via extensions, including design by contract and logic programming. Python is often referred to as a 'glue language' because it is purposely designed to be able to integrate components written in other languages. Python uses dynamic typing and a combination of reference counting and a cycle-detecting garbage collector for memory management. It uses dynamic name resolution (late binding), which binds method and variable names during program execution. Python's design offers some support for functional programming in the "Lisp tradition". It has filter, map, and reduce functions; list comprehensions, dictionaries, sets, and generator expressions. The standard library has two modules (itertools and functools) that implement functional tools borrowed from Haskell and Standard ML. Python's core philosophy is summarized in the Zen of Python (PEP 20) written by Tim Peters, which includes aphorisms such as these: However, Python has received criticism for violating these principles and adding unnecessary language bloat. Responses to these criticisms note that the Zen of Python is a guideline rather than a rule. The addition of some new features had been controversial: Guido van Rossum resigned as Benevolent Dictator for Life after conflict about adding the assignment expression operator in Python 3.8. Nevertheless, rather than building all functionality into its core, Python was designed to be highly extensible via modules. This compact modularity has made it particularly popular as a means of adding programmable interfaces to existing applications. Van Rossum's vision of a small core language with a large standard library and easily extensible interpreter stemmed from his frustrations with ABC, which represented the opposite approach. Python claims to strive for a simpler, less-cluttered syntax and grammar, while giving developers a choice in their coding methodology. Python lacks do .. while loops, which Rossum considered harmful. In contrast to Perl's motto "there is more than one way to do it", Python advocates an approach where "there should be one – and preferably only one – obvious way to do it". In practice, however, Python provides many ways to achieve a given goal. There are at least three ways to format a string literal, with no certainty as to which one a programmer should use. Alex Martelli is a Fellow at the Python Software Foundation and Python book author; he wrote that "To describe something as 'clever' is not considered a compliment in the Python culture." Python's developers typically prioritize readability over performance. For example, they reject patches to non-critical parts of the CPython reference implementation that would offer increases in speed that do not justify the cost of clarity and readability.[failed verification] Execution speed can be improved by moving speed-critical functions to extension modules written in languages such as C, or by using a just-in-time compiler like PyPy. Also, it is possible to transpile to other languages. However, this approach either fails to achieve the expected speed-up, since Python is a very dynamic language, or only a restricted subset of Python is compiled (with potential minor semantic changes). Python is meant to be a fun language to use. This goal is reflected in the name – a tribute to the British comedy group Monty Python – and in playful approaches to some tutorials and reference materials. For instance, some code examples use the terms "spam" and "eggs" (in reference to a Monty Python sketch), rather than the typical terms "foo" and "bar". A common neologism in the Python community is pythonic, which has a broad range of meanings related to program style: Pythonic code may use Python idioms well; be natural or show fluency in the language; or conform with Python's minimalist philosophy and emphasis on readability. Syntax and semantics Python is meant to be an easily readable language. Its formatting is visually uncluttered and often uses English keywords where other languages use punctuation. Unlike many other languages, it does not use curly brackets to delimit blocks, and semicolons after statements are allowed but rarely used. It has fewer syntactic exceptions and special cases than C or Pascal. Python uses whitespace indentation, rather than curly brackets or keywords, to delimit blocks. An increase in indentation comes after certain statements; a decrease in indentation signifies the end of the current block. Thus, the program's visual structure accurately represents its semantic structure. This feature is sometimes termed the off-side rule. Some other languages use indentation this way; but in most, indentation has no semantic meaning. The recommended indent size is four spaces. Python's statements include the following: The assignment statement (=) binds a name as a reference to a separate, dynamically allocated object. Variables may subsequently be rebound at any time to any object. In Python, a variable name is a generic reference holder without a fixed data type; however, it always refers to some object with a type. This is called dynamic typing—in contrast to statically-typed languages, where each variable may contain only a value of a certain type. Python does not support tail call optimization or first-class continuations; according to Van Rossum, the language never will. However, better support for coroutine-like functionality is provided by extending Python's generators. Before 2.5, generators were lazy iterators; data was passed unidirectionally out of the generator. From Python 2.5 on, it is possible to pass data back into a generator function; and from version 3.3, data can be passed through multiple stack levels. Python's expressions include the following: In Python, a distinction between expressions and statements is rigidly enforced, in contrast to languages such as Common Lisp, Scheme, or Ruby. This distinction leads to duplicating some functionality, for example: A statement cannot be part of an expression; because of this restriction, expressions such as list and dict comprehensions (and lambda expressions) cannot contain statements. As a particular case, an assignment statement such as a = 1 cannot be part of the conditional expression of a conditional statement. Python uses duck typing, and it has typed objects but untyped variable names. Type constraints are not checked at definition time; rather, operations on an object may fail at usage time, indicating that the object is not of an appropriate type. Despite being dynamically typed, Python is strongly typed, forbidding operations that are poorly defined (e.g., adding a number and a string) rather than quietly attempting to interpret them. Python allows programmers to define their own types using classes, most often for object-oriented programming. New instances of classes are constructed by calling the class, for example, SpamClass() or EggsClass()); the classes are instances of the metaclass type (which is an instance of itself), thereby allowing metaprogramming and reflection. Before version 3.0, Python had two kinds of classes, both using the same syntax: old-style and new-style. Current Python versions support the semantics of only the new style. Python supports optional type annotations. These annotations are not enforced by the language, but may be used by external tools such as mypy to catch errors. Python includes a module typing including several type names for type annotations. Also, mypy supports a Python compiler called mypyc, which leverages type annotations for optimization. 1.33333 frozenset() Python includes conventional symbols for arithmetic operators (+, -, *, /), the floor-division operator //, and the modulo operator %. (With the modulo operator, a remainder can be negative, e.g., 4 % -3 == -2.) Also, Python offers the ** symbol for exponentiation, e.g. 5**3 == 125 and 9**0.5 == 3.0. Also, it offers the matrix‑multiplication operator @ . These operators work as in traditional mathematics; with the same precedence rules, the infix operators + and - can also be unary, to represent positive and negative numbers respectively. Division between integers produces floating-point results. The behavior of division has changed significantly over time: In Python terms, the / operator represents true division (or simply division), while the // operator represents floor division. Before version 3.0, the / operator represents classic division. Rounding towards negative infinity, though a different method than in most languages, adds consistency to Python. For instance, this rounding implies that the equation (a + b)//b == a//b + 1 is always true. Also, the rounding implies that the equation b*(a//b) + a%b == a is valid for both positive and negative values of a. As expected, the result of a%b lies in the half-open interval [0, b), where b is a positive integer; however, maintaining the validity of the equation requires that the result must lie in the interval (b, 0] when b is negative. Python provides a round function for rounding a float to the nearest integer. For tie-breaking, Python 3 uses the round to even method: round(1.5) and round(2.5) both produce 2. Python versions before 3 used the round-away-from-zero method: round(0.5) is 1.0, and round(-0.5) is −1.0. Python allows Boolean expressions that contain multiple equality relations to be consistent with general usage in mathematics. For example, the expression a < b < c tests whether a is less than b and b is less than c. C-derived languages interpret this expression differently: in C, the expression would first evaluate a < b, resulting in 0 or 1, and that result would then be compared with c. Python uses arbitrary-precision arithmetic for all integer operations. The Decimal type/class in the decimal module provides decimal floating-point numbers to a pre-defined arbitrary precision with several rounding modes. The Fraction class in the fractions module provides arbitrary precision for rational numbers. Due to Python's extensive mathematics library and the third-party library NumPy, the language is frequently used for scientific scripting in tasks such as numerical data processing and manipulation. Functions are created in Python by using the def keyword. A function is defined similarly to how it is called, by first providing the function name and then the required parameters. Here is an example of a function that prints its inputs: To assign a default value to a function parameter in case no actual value is provided at run time, variable-definition syntax can be used inside the function header. Code examples "Hello, World!" program: Program to calculate the factorial of a non-negative integer: Libraries Python's large standard library is commonly cited as one of its greatest strengths. For Internet-facing applications, many standard formats and protocols such as MIME and HTTP are supported. The language includes modules for creating graphical user interfaces, connecting to relational databases, generating pseudorandom numbers, arithmetic with arbitrary-precision decimals, manipulating regular expressions, and unit testing. Some parts of the standard library are covered by specifications—for example, the Web Server Gateway Interface (WSGI) implementation wsgiref follows PEP 333—but most parts are specified by their code, internal documentation, and test suites. However, because most of the standard library is cross-platform Python code, only a few modules must be altered or rewritten for variant implementations. As of 13 March 2025,[update] the Python Package Index (PyPI), the official repository for third-party Python software, contains over 614,339 packages. Development environments Most[which?] Python implementations (including CPython) include a read–eval–print loop (REPL); this permits the environment to function as a command line interpreter, with which users enter statements sequentially and receive results immediately. Also, CPython is bundled with an integrated development environment (IDE) called IDLE, which is oriented toward beginners.[citation needed] Other shells, including IDLE and IPython, add additional capabilities such as improved auto-completion, session-state retention, and syntax highlighting. Standard desktop IDEs include PyCharm, Spyder, and Visual Studio Code; there are web browser-based IDEs, such as the following environments: Implementations CPython is the reference implementation of Python. This implementation is written in C, meeting the C11 standard since version 3.11. Older versions use the C89 standard with several select C99 features, but third-party extensions are not limited to older C versions—e.g., they can be implemented using C11 or C++. CPython compiles Python programs into an intermediate bytecode, which is then executed by a virtual machine. CPython is distributed with a large standard library written in a combination of C and native Python. CPython is available for many platforms, including Windows and most modern Unix-like systems, including macOS (and Apple M1 Macs, since Python 3.9.1, using an experimental installer). Starting with Python 3.9, the Python installer intentionally fails to install on Windows 7 and 8; Windows XP was supported until Python 3.5, with unofficial support for VMS. Platform portability was one of Python's earliest priorities. During development of Python 1 and 2, even OS/2 and Solaris were supported; since that time, support has been dropped for many platforms. All current Python versions (since 3.7) support only operating systems that feature multithreading, by now supporting not nearly as many operating systems (dropping many outdated) than in the past. All alternative implementations have at least slightly different semantics. For example, an alternative may include unordered dictionaries, in contrast to other current Python versions. As another example in the larger Python ecosystem, PyPy does not support the full C Python API. Creating an executable with Python often is done by bundling an entire Python interpreter into the executable, which causes binary sizes to be massive for small programs, yet there exist implementations that are capable of truly compiling Python. Alternative implementations include the following: Stackless Python is a significant fork of CPython that implements microthreads. This implementation uses the call stack differently, thus allowing massively concurrent programs. PyPy also offers a stackless version. Just-in-time Python compilers have been developed, but are now unsupported: There are several compilers/transpilers to high-level object languages; the source language is unrestricted Python, a subset of Python, or a language similar to Python: There are also specialized compilers: Some older projects existed, as well as compilers not designed for use with Python 3.x and related syntax: A performance comparison among various Python implementations, using a non-numerical (combinatorial) workload, was presented at EuroSciPy '13. In addition, Python's performance relative to other programming languages is benchmarked by The Computer Language Benchmarks Game. There are several approaches to optimizing Python performance, despite the inherent slowness of an interpreted language. These approaches include the following strategies or tools: Language Development Python's development is conducted mostly through the Python Enhancement Proposal (PEP) process; this process is the primary mechanism for proposing major new features, collecting community input on issues, and documenting Python design decisions. Python coding style is covered in PEP 8. Outstanding PEPs are reviewed and commented on by the Python community and the steering council. Enhancement of the language corresponds with development of the CPython reference implementation. The mailing list python-dev is the primary forum for the language's development. Specific issues were originally discussed in the Roundup bug tracker hosted by the foundation. In 2022, all issues and discussions were migrated to GitHub. Development originally took place on a self-hosted source-code repository running Mercurial, until Python moved to GitHub in January 2017. CPython's public releases have three types, distinguished by which part of the version number is incremented: Many alpha, beta, and release-candidates are also released as previews and for testing before final releases. Although there is a rough schedule for releases, they are often delayed if the code is not ready yet. Python's development team monitors the state of the code by running a large unit test suite during development. The major academic conference on Python is PyCon. Also, there are special Python mentoring programs, such as PyLadies. Naming Python's name is inspired by the British comedy group Monty Python, whom Python creator Guido van Rossum enjoyed while developing the language. Monty Python references appear frequently in Python code and culture; for example, the metasyntactic variables often used in Python literature are spam and eggs, rather than the traditional foo and bar. Also, the official Python documentation contains various references to Monty Python routines. Python users are sometimes referred to as "Pythonistas". Languages influenced by Python See also Notes References Further reading External links |
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Contents Social network 1800s: Martineau · Tocqueville · Marx · Spencer · Le Bon · Ward · Pareto · Tönnies · Veblen · Simmel · Durkheim · Addams · Mead · Weber · Du Bois · Mannheim · Elias A social network is a social structure consisting of a set of social actors (such as individuals or organizations), networks of dyadic ties, and other social interactions between actors. The social network perspective provides a set of methods for analyzing the structure of whole social entities along with a variety of theories explaining the patterns observed in these structures. The study of these structures uses social network analysis to identify local and global patterns, locate influential entities, and examine dynamics of networks. For instance, social network analysis has been used in studying the spread of misinformation on social media platforms or analyzing the influence of key figures in social networks. Social networks and the analysis of them is an inherently interdisciplinary academic field which emerged from social psychology, sociology, statistics, and graph theory. Georg Simmel authored early structural theories in sociology emphasizing the dynamics of triads and "web of group affiliations". Jacob Moreno is credited with developing the first sociograms in the 1930s to study interpersonal relationships. These approaches were mathematically formalized in the 1950s and theories and methods of social networks became pervasive in the social and behavioral sciences by the 1980s. Social network analysis is now one of the major paradigms in contemporary sociology, and is also employed in a number of other social and formal sciences. Together with other complex networks, it forms part of the nascent field of network science. Overview The social network is a theoretical construct useful in the social sciences to study relationships between individuals, groups, organizations, or even entire societies (social units, see differentiation). The term is used to describe a social structure determined by such interactions. The ties through which any given social unit connects represent the convergence of the various social contacts of that unit. This theoretical approach is, necessarily, relational. An axiom of the social network approach to understanding social interaction is that social phenomena should be primarily conceived and investigated through the properties of relations between and within units, instead of the properties of these units themselves. Thus, one common criticism of social network theory is that individual agency is often ignored although this may not be the case in practice (see agent-based modeling). Precisely because many different types of relations, singular or in combination, form these network configurations, network analytics are useful to a broad range of research enterprises. In social science, these fields of study include, but are not limited to anthropology, biology, communication studies, economics, geography, information science, organizational studies, social psychology, sociology, and sociolinguistics. History In the late 1890s, both Émile Durkheim and Ferdinand Tönnies foreshadowed the idea of social networks in their theories and research of social groups. Tönnies argued that social groups can exist as personal and direct social ties that either link individuals who share values and belief (Gemeinschaft, German, commonly translated as "community") or impersonal, formal, and instrumental social links (Gesellschaft, German, commonly translated as "society"). Durkheim gave a non-individualistic explanation of social facts, arguing that social phenomena arise when interacting individuals constitute a reality that can no longer be accounted for in terms of the properties of individual actors. Georg Simmel, writing at the turn of the twentieth century, pointed to the nature of networks and the effect of network size on interaction and examined the likelihood of interaction in loosely knit networks rather than groups. Major developments in the field can be seen in the 1930s by several groups in psychology, anthropology, and mathematics working independently. In psychology, in the 1930s, Jacob L. Moreno began systematic recording and analysis of social interaction in small groups, especially classrooms and work groups (see sociometry). In anthropology, the foundation for social network theory is the theoretical and ethnographic work of Bronislaw Malinowski, Alfred Radcliffe-Brown, and Claude Lévi-Strauss. A group of social anthropologists associated with Max Gluckman and the Manchester School, including John A. Barnes, J. Clyde Mitchell and Elizabeth Bott Spillius, often are credited with performing some of the first fieldwork from which network analyses were performed, investigating community networks in southern Africa, India and the United Kingdom. Concomitantly, British anthropologist S. F. Nadel codified a theory of social structure that was influential in later network analysis. In sociology, the early (1930s) work of Talcott Parsons set the stage for taking a relational approach to understanding social structure. Later, drawing upon Parsons' theory, the work of sociologist Peter Blau provides a strong impetus for analyzing the relational ties of social units with his work on social exchange theory. By the 1970s, a growing number of scholars worked to combine the different tracks and traditions. One group consisted of sociologist Harrison White and his students at the Harvard University Department of Social Relations. Also independently active in the Harvard Social Relations department at the time were Charles Tilly, who focused on networks in political and community sociology and social movements, and Stanley Milgram, who developed the "six degrees of separation" thesis. Mark Granovetter and Barry Wellman are among the former students of White who elaborated and championed the analysis of social networks. Beginning in the late 1990s, social network analysis experienced work by sociologists, political scientists, and physicists such as Duncan J. Watts, Albert-László Barabási, Peter Bearman, Nicholas A. Christakis, James H. Fowler, and others, developing and applying new models and methods to emerging data available about online social networks, as well as "digital traces" regarding face-to-face networks. Levels of analysis In general, social networks are self-organizing, emergent, and complex, such that a globally coherent pattern appears from the local interaction of the elements that make up the system. These patterns become more apparent as network size increases. However, a global network analysis of, for example, all interpersonal relationships in the world is not feasible and is likely to contain so much information as to be uninformative. Practical limitations of computing power, ethics and participant recruitment and payment also limit the scope of a social network analysis. The nuances of a local system may be lost in a large network analysis, hence the quality of information may be more important than its scale for understanding network properties. Thus, social networks are analyzed at the scale relevant to the researcher's theoretical question. Although levels of analysis are not necessarily mutually exclusive, there are three general levels into which networks may fall: micro-level, meso-level, and macro-level. At the micro-level, social network research typically begins with an individual, snowballing as social relationships are traced, or may begin with a small group of individuals in a particular social context. Dyadic level: A dyad is a social relationship between two individuals. Network research on dyads may concentrate on structure of the relationship (e.g. multiplexity, strength), social equality, and tendencies toward reciprocity/mutuality. Triadic level: Add one individual to a dyad, and you have a triad. Research at this level may concentrate on factors such as balance and transitivity, as well as social equality and tendencies toward reciprocity/mutuality. In the balance theory of Fritz Heider the triad is the key to social dynamics. The discord in a rivalrous love triangle is an example of an unbalanced triad, likely to change to a balanced triad by a change in one of the relations. The dynamics of social friendships in society has been modeled by balancing triads. The study is carried forward with the theory of signed graphs. Actor level: The smallest unit of analysis in a social network is an individual in their social setting, i.e., an "actor" or "ego." Egonetwork analysis focuses on network characteristics, such as size, relationship strength, density, centrality, prestige and roles such as isolates, liaisons, and bridges. Such analyses, are most commonly used in the fields of psychology or social psychology, ethnographic kinship analysis or other genealogical studies of relationships between individuals. Subset level: Subset levels of network research problems begin at the micro-level, but may cross over into the meso-level of analysis. Subset level research may focus on distance and reachability, cliques, cohesive subgroups, or other group actions or behavior. In general, meso-level theories begin with a population size that falls between the micro- and macro-levels. However, meso-level may also refer to analyses that are specifically designed to reveal connections between micro- and macro-levels. Meso-level networks are low density and may exhibit causal processes distinct from interpersonal micro-level networks. Organizations: Formal organizations are social groups that distribute tasks for a collective goal. Network research on organizations may focus on either intra-organizational or inter-organizational ties in terms of formal or informal relationships. Intra-organizational networks themselves often contain multiple levels of analysis, especially in larger organizations with multiple branches, franchises or semi-autonomous departments. In these cases, research is often conducted at a work group level and organization level, focusing on the interplay between the two structures. Experiments with networked groups online have documented ways to optimize group-level coordination through diverse interventions, including the addition of autonomous agents to the groups. Randomly distributed networks: Exponential random graph models of social networks became state-of-the-art methods of social network analysis in the 1980s. This framework has the capacity to represent social-structural effects commonly observed in many human social networks, including general degree-based structural effects commonly observed in many human social networks as well as reciprocity and transitivity, and at the node-level, homophily and attribute-based activity and popularity effects, as derived from explicit hypotheses about dependencies among network ties. Parameters are given in terms of the prevalence of small subgraph configurations in the network and can be interpreted as describing the combinations of local social processes from which a given network emerges. These probability models for networks on a given set of actors allow generalization beyond the restrictive dyadic independence assumption of micro-networks, allowing models to be built from theoretical structural foundations of social behavior. Scale-free networks: A scale-free network is a network whose degree distribution follows a power law, at least asymptotically. In network theory a scale-free ideal network is a random network with a degree distribution that unravels the size distribution of social groups. Specific characteristics of scale-free networks vary with the theories and analytical tools used to create them, however, in general, scale-free networks have some common characteristics. One notable characteristic in a scale-free network is the relative commonness of vertices with a degree that greatly exceeds the average. The highest-degree nodes are often called "hubs", and may serve specific purposes in their networks, although this depends greatly on the social context. Another general characteristic of scale-free networks is the clustering coefficient distribution, which decreases as the node degree increases. This distribution also follows a power law. The Barabási model of network evolution shown above is an example of a scale-free network. Rather than tracing interpersonal interactions, macro-level analyses generally trace the outcomes of interactions, such as economic or other resource transfer interactions over a large population. Large-scale networks: Large-scale network is a term somewhat synonymous with "macro-level." It is primarily used in social and behavioral sciences, and in economics. Originally, the term was used extensively in the computer sciences (see large-scale network mapping). Complex networks: Most larger social networks display features of social complexity, which involves substantial non-trivial features of network topology, with patterns of complex connections between elements that are neither purely regular nor purely random (see, complexity science, dynamical system and chaos theory), as do biological, and technological networks. Such complex network features include a heavy tail in the degree distribution, a high clustering coefficient, assortativity or disassortativity among vertices, community structure (see stochastic block model), and hierarchical structure. In the case of agency-directed networks these features also include reciprocity, triad significance profile (TSP, see network motif), and other features. In contrast, many of the mathematical models of networks that have been studied in the past, such as lattices and random graphs, do not show these features. Theoretical links Various theoretical frameworks have been imported for the use of social network analysis. The most prominent of these are Graph theory, Balance theory, Social comparison theory, and more recently, the Social identity approach. Few complete theories have been produced from social network analysis. Two that have are structural role theory and heterophily theory. The basis of Heterophily Theory was the finding in one study that more numerous weak ties can be important in seeking information and innovation, as cliques have a tendency to have more homogeneous opinions as well as share many common traits. This homophilic tendency was the reason for the members of the cliques to be attracted together in the first place. However, being similar, each member of the clique would also know more or less what the other members knew. To find new information or insights, members of the clique will have to look beyond the clique to its other friends and acquaintances. This is what Granovetter called "the strength of weak ties". Structural holes In the context of networks, social capital exists where people have an advantage because of their location in a network. Contacts in a network provide information, opportunities and perspectives that can be beneficial to the central player in the network. Most social structures tend to be characterized by dense clusters of strong connections. Information within these clusters tends to be rather homogeneous and redundant. Non-redundant information is most often obtained through contacts in different clusters. When two separate clusters possess non-redundant information, there is said to be a structural hole between them. Thus, a network that bridges structural holes will provide network benefits that are in some degree additive, rather than overlapping. An ideal network structure has a vine and cluster structure, providing access to many different clusters and structural holes. Networks rich in structural holes are a form of social capital in that they offer information benefits. The main player in a network that bridges structural holes is able to access information from diverse sources and clusters. For example, in business networks, this is beneficial to an individual's career because he is more likely to hear of job openings and opportunities if his network spans a wide range of contacts in different industries/sectors. This concept is similar to Mark Granovetter's theory of weak ties, which rests on the basis that having a broad range of contacts is most effective for job attainment. Structural holes have been widely applied in social network analysis, resulting in applications in a wide range of practical scenarios as well as machine learning-based social prediction. Research clusters Research has used network analysis to examine networks created when artists are exhibited together in museum exhibition. Such networks have been shown to affect an artist's recognition in history and historical narratives, even when controlling for individual accomplishments of the artist. Other work examines how network grouping of artists can affect an individual artist's auction performance. An artist's status has been shown to increase when associated with higher status networks, though this association has diminishing returns over an artist's career. In J.A. Barnes' day, a "community" referred to a specific geographic location and studies of community ties had to do with who talked, associated, traded, and attended church with whom. Today, however, there are extended "online" communities developed through telecommunications devices and social network services. Such devices and services require extensive and ongoing maintenance and analysis, often using network science methods. Community development studies, today, also make extensive use of such methods. Complex networks require methods specific to modelling and interpreting social complexity and complex adaptive systems, including techniques of dynamic network analysis. Mechanisms such as Dual-phase evolution explain how temporal changes in connectivity contribute to the formation of structure in social networks. The study of social networks is being used to examine the nature of interdependencies between actors and the ways in which these are related to outcomes of conflict and cooperation. Areas of study include cooperative behavior among participants in collective actions such as protests; promotion of peaceful behavior, social norms, and public goods within communities through networks of informal governance; the role of social networks in both intrastate conflict and interstate conflict; and social networking among politicians, constituents, and bureaucrats. In criminology and urban sociology, much attention has been paid to the social networks among criminal actors. For example, murders can be seen as a series of exchanges between gangs. Murders can be seen to diffuse outwards from a single source, because weaker gangs cannot afford to kill members of stronger gangs in retaliation, but must commit other violent acts to maintain their reputation for strength. Diffusion of ideas and innovations studies focus on the spread and use of ideas from one actor to another or one culture and another. This line of research seeks to explain why some become "early adopters" of ideas and innovations, and links social network structure with facilitating or impeding the spread of an innovation. A case in point is the social diffusion of linguistic innovation such as neologisms. Experiments and large-scale field trials (e.g., by Nicholas Christakis and collaborators) have shown that cascades of desirable behaviors can be induced in social groups, in settings as diverse as Honduras villages, Indian slums, or in the lab. Still other experiments have documented the experimental induction of social contagion of voting behavior, emotions, risk perception, and commercial products. In demography, the study of social networks has led to new sampling methods for estimating and reaching populations that are hard to enumerate (for example, homeless people or intravenous drug users.) For example, respondent driven sampling is a network-based sampling technique that relies on respondents to a survey recommending further respondents. The field of sociology focuses almost entirely on networks of outcomes of social interactions. More narrowly, economic sociology considers behavioral interactions of individuals and groups through social capital and social "markets". Sociologists, such as Mark Granovetter, have developed core principles about the interactions of social structure, information, ability to punish or reward, and trust that frequently recur in their analyses of political, economic and other institutions. Granovetter examines how social structures and social networks can affect economic outcomes like hiring, price, productivity and innovation and describes sociologists' contributions to analyzing the impact of social structure and networks on the economy. Analysis of social networks is increasingly incorporated into health care analytics, not only in epidemiological studies but also in models of patient communication and education, disease prevention, mental health diagnosis and treatment, and in the study of health care organizations and systems. Human ecology is an interdisciplinary and transdisciplinary study of the relationship between humans and their natural, social, and built environments. The scientific philosophy of human ecology has a diffuse history with connections to geography, sociology, psychology, anthropology, zoology, and natural ecology. In the study of literary systems, network analysis has been applied by Anheier, Gerhards and Romo, De Nooy, Senekal, and Lotker, to study various aspects of how literature functions. The basic premise is that polysystem theory, which has been around since the writings of Even-Zohar, can be integrated with network theory and the relationships between different actors in the literary network, e.g. writers, critics, publishers, literary histories, etc., can be mapped using visualization from SNA. Research studies of formal or informal organization relationships, organizational communication, economics, economic sociology, and other resource transfers. Social networks have also been used to examine how organizations interact with each other, characterizing the many informal connections that link executives together, as well as associations and connections between individual employees at different organizations. Many organizational social network studies focus on teams. Within team network studies, research assesses, for example, the predictors and outcomes of centrality and power, density and centralization of team instrumental and expressive ties, and the role of between-team networks. Intra-organizational networks have been found to affect organizational commitment, organizational identification, interpersonal citizenship behaviour. Social capital is a form of economic and cultural capital in which social networks are central, transactions are marked by reciprocity, trust, and cooperation, and market agents produce goods and services not mainly for themselves, but for a common good. Social capital is split into three dimensions: the structural, the relational and the cognitive dimension. The structural dimension describes how partners interact with each other and which specific partners meet in a social network. Also, the structural dimension of social capital indicates the level of ties among organizations. This dimension is highly connected to the relational dimension which refers to trustworthiness, norms, expectations and identifications of the bonds between partners. The relational dimension explains the nature of these ties which is mainly illustrated by the level of trust accorded to the network of organizations. The cognitive dimension analyses the extent to which organizations share common goals and objectives as a result of their ties and interactions. Social capital is a sociological concept about the value of social relations and the role of cooperation and confidence to achieve positive outcomes. The term refers to the value one can get from their social ties. For example, newly arrived immigrants can make use of their social ties to established migrants to acquire jobs they may otherwise have trouble getting (e.g., because of unfamiliarity with the local language). A positive relationship exists between social capital and the intensity of social network use. In a dynamic framework, higher activity in a network feeds into higher social capital which itself encourages more activity. This particular cluster focuses on brand-image and promotional strategy effectiveness, taking into account the impact of customer participation on sales and brand-image. This is gauged through techniques such as sentiment analysis which rely on mathematical areas of study such as data mining and analytics. This area of research produces vast numbers of commercial applications as the main goal of any study is to understand consumer behaviour and drive sales. In many organizations, members tend to focus their activities inside their own groups, which stifles creativity and restricts opportunities. A player whose network bridges structural holes has an advantage in detecting and developing rewarding opportunities. Such a player can mobilize social capital by acting as a "broker" of information between two clusters that otherwise would not have been in contact, thus providing access to new ideas, opinions and opportunities. British philosopher and political economist John Stuart Mill, writes, "it is hardly possible to overrate the value of placing human beings in contact with persons dissimilar to themselves.... Such communication [is] one of the primary sources of progress." Thus, a player with a network rich in structural holes can add value to an organization through new ideas and opportunities. This in turn, helps an individual's career development and advancement. A social capital broker also reaps control benefits of being the facilitator of information flow between contacts. Full communication with exploratory mindsets and information exchange generated by dynamically alternating positions in a social network promotes creative and deep thinking. In the case of consulting firm Eden McCallum, the founders were able to advance their careers by bridging their connections with former big three consulting firm consultants and mid-size industry firms. By bridging structural holes and mobilizing social capital, players can advance their careers by executing new opportunities between contacts. There has been research that both substantiates and refutes the benefits of information brokerage. A study of high tech Chinese firms by Zhixing Xiao found that the control benefits of structural holes are "dissonant to the dominant firm-wide spirit of cooperation and the information benefits cannot materialize due to the communal sharing values" of such organizations. However, this study only analyzed Chinese firms, which tend to have strong communal sharing values. Information and control benefits of structural holes are still valuable in firms that are not quite as inclusive and cooperative on the firm-wide level. In 2004, Ronald Burt studied 673 managers who ran the supply chain for one of America's largest electronics companies. He found that managers who often discussed issues with other groups were better paid, received more positive job evaluations and were more likely to be promoted. Thus, bridging structural holes can be beneficial to an organization, and in turn, to an individual's career. Computer networks combined with social networking software produce a new medium for social interaction. A relationship over a computerized social networking service can be characterized by context, direction, and strength. The content of a relation refers to the resource that is exchanged. In a computer-mediated communication context, social pairs exchange different kinds of information, including sending a data file or a computer program as well as providing emotional support or arranging a meeting. With the rise of electronic commerce, information exchanged may also correspond to exchanges of money, goods or services in the "real" world. Social network analysis methods have become essential to examining these types of computer mediated communication. In addition, the sheer size and the volatile nature of social media has given rise to new network metrics. A key concern with networks extracted from social media is the lack of robustness of network metrics given missing data. Based on the pattern of homophily, ties between people are most likely to occur between nodes that are most similar to each other, or within neighbourhood segregation, individuals are most likely to inhabit the same regional areas as other individuals who are like them. Therefore, social networks can be used as a tool to measure the degree of segregation or homophily within a social network. Social Networks can both be used to simulate the process of homophily but it can also serve as a measure of level of exposure of different groups to each other within a current social network of individuals in a certain area. See also References Further reading External links |
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Contents Speaker of the Knesset The speaker of the Knesset (Hebrew: יוֹשֵׁב רֹאשׁ הכנסת, romanized: Yoshev Rosh HaKnesset; Arabic: رئيس الكنيست, romanized: Ra'īs Al-Kinisit, lit. 'Chairman of the Knesset') is the presiding officer of the Knesset, the unicameral legislature of Israel. The Speaker also acts as President of Israel when the President is incapacitated. The current speaker is Amir Ohana, who was elected on 29 December 2022. Position The Speaker and their deputies are elected by members of the Knesset. Until a Speaker is elected, the oldest Knesset member who is not the prime minister, the prime minister-elect, a minister or deputy minister, serves as acting speaker. The Speaker is responsible for conducting the affairs of the Knesset and representing the Knesset. They are also charged with preserving the dignity of the Knesset, the decorum of its sittings and observance of Knesset rules of procedure. The Speaker is assisted by a number of Deputy Speakers. Together, the Speaker and Deputy Speakers constitute the Presidium of the Knesset. The Presidium sets the Knesset agenda. Ahdut HaAvoda's Nahum Nir and Blue & White's Benny Gantz are the only Speakers not to have come from the ruling party, though in two cases (Avraham Burg and Reuven Rivlin) the party of the speaker (One Israel and Likud respectively) lost power during their term. The Speaker is expected to act in a non-partisan nature, but may occasionally take part in debates, and is allowed to vote. List of Knesset speakers A total of twenty people have served as Speaker of the Knesset, two of whom, Reuven Rivlin and Yariv Levin, have served two non-consecutive terms. References External links |
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Contents History of the United States (1991–2016) The history of the United States from 1991 to 2016 began following the dissolution of the Soviet Union. The dissolution signaled the end of the Cold War and left the U.S. unchallenged as the world's sole superpower. The U.S. took a leading role in military involvement in the Middle East. The U.S. expelled an Iraqi invasion force from Kuwait, a Middle Eastern ally of the U.S., in the Persian Gulf War. On the domestic front, the Democrats won a return to the White House with the election of Bill Clinton in 1992. In the 1994 midterm election, the Republicans won control of Congress for the first time in 40 years. Strife between Clinton and the Republicans in Congress initially resulted in a federal government shutdown following a budget crisis, but later they worked together to pass welfare reform, the Children's Health Insurance Program, and a balanced budget. Charges from the Clinton–Lewinsky scandal led to the 1998 impeachment of Bill Clinton by the House of Representatives but he was later acquitted by the Senate. The U.S. economy boomed in the enthusiasm for high-technology industries in the 1990s until the Nasdaq crashed as the dot-com bubble burst and the early 2000s recession marked the end of the sustained economic growth. In 2000, Republican George W. Bush was elected president in one of the closest elections in U.S. history. Early in his term, his administration approved education reform and a large across-the-board tax cut aimed at stimulating the economy. Following the September 11 attacks in 2001, the U.S. embarked on the global war on terrorism, starting with the 2001 war in Afghanistan to depose the Taliban and eliminate Al-Qaeda. In 2003, the U.S. invaded Iraq, deposing Saddam Hussein and setting up the Republic of Iraq resulting in a prolonged conflict that would continue over the course of the decade. The Homeland Security Department was formed and the controversial Patriot Act was passed to bolster domestic efforts against terrorism. In 2006, criticism over the handling of the disastrous Hurricane Katrina (which struck the Gulf Coast region in 2005), political scandals, and the growing unpopularity of the Iraq War helped the Democrats gain control of Congress. Saddam Hussein was later tried, charged for war crimes and crimes against humanity, and executed by hanging. In 2007, President Bush ordered a troop surge in Iraq, which ultimately led to reduced casualties. The collapse of the housing bubble in 2007 led to the Great Recession. The resulting economic downturn and general discontent led Barack Obama to win the presidential election in 2008, becoming the country's first African-American president. Obama's domestic agenda notably included economic stimulus packages and the Affordable Care Act. The year 2011 saw the formal end to the Iraq War, the killing of Al-Qaeda leader Osama bin Laden, and the outbreak of the Syrian Civil War. The war on terror continued with an increase in the use of drone warfare and a shift in attention toward the Islamic State in the 2010s. In 2016, China surpassed the United States to become the world's largest economy when measured by purchasing power parity (PPP). Globalization and the new economy During Bill Clinton's presidency American political discourse focused mostly on domestic issues. While the early 1990s saw the US economy mired in recession, a recovery began starting in 1994 and began accelerating thanks to a boom created by technology. The Internet and related technologies made their first broad penetrations into the economy, prompting a Wall Street technology-driven bubble, which Federal Reserve chairman Alan Greenspan described in 1996 as "irrational exuberance". By 1998, the economy was booming and unemployment below 5%. Following the dissolution of the Soviet Union in 1991, the United States was the world's dominant military power and Japan, sometimes seen as the largest economic rival to the U.S., was caught in a period of stagnation. China was emerging as the U.S.'s foremost trading competitor in more and more areas, with China's exports growing exceedingly during the 1990s and well into the 2000s. Localized conflicts such as those in Haiti and the Balkans prompted President Bill Clinton to send in U.S. troops as peacekeepers, reviving the Cold-War-era controversy about whether policing the rest of the world was a proper U.S. role. Islamic radicals overseas loudly threatened assaults against the U.S. for its ongoing military presence in the Middle East, and even staged the first World Trade Center attack, a truck bombing in New York's twin towers, in 1993, as well as a number of deadly attacks on U.S. interests abroad. Immigration, mainly from Latin America and Asia, swelled during the 1990s, laying the groundwork for great changes in the demographic makeup of the U.S. population in coming decades, such as Hispanics replacing African-Americans as the largest minority. Despite tougher border scrutiny after the September 11 attacks, nearly 8 million immigrants came to the United States from 2000 to 2005—more than in any other five-year period in the nation's history—with almost half entering illegally. The 1990s saw the US becoming more involved in free trade with the NAFTA agreement involving the US, Canada and Mexico being signed in 1992 before coming into effect in 1994 along with joining the World Trade Organization in 1995. During this period, inflation remained low despite recessions happening making it different from previous times in US history when inflation would increase when the economy grew. Deflation was only reported in one year which was 2009 with the inflation rate being −0.4%. Early 2000 to 2001 saw the dramatic bursting of the dot-com bubble. Excitement over the prospects of Internet stocks had led to huge increases in the major indexes. However, dozens of start-up Internet companies failed as many of the lofty promises heralded by the new world of the Web failed to materialize. On March 10, 2000, the Nasdaq peaked at 5,048.62, more than double its value just a year before. The downturn began on March 13, 2000, triggering a chain reaction of selling that fed on itself as investors, funds, and institutions liquidated positions. In just six days, the NASDAQ had lost nearly nine percent, falling to 4,580 on March 15. By 2001, the bubble was deflating at full speed. A majority of the dot-coms ceased trading after burning through their venture capital, many having never made a profit. In 2002, the GDP growth rate rose to 2.8%. A major short-term problem in the first half of 2002 was a sharp decline in the stock market, fueled in part by the exposure of dubious accounting practices in some major corporations. Another was unemployment, which experienced the longest period of monthly increase since the Great Depression. The United States began to recover from the post-9/11 recession in 2003, but the robustness of the market (7% GDP growth), combined with the unemployment rate (above 6%), led some economists and politicians to refer to the situation as a "jobless recovery". Despite this, economic growth continued apace through early 2008 and unemployment dropped below 5%. The Great Recession began in December 2007 and was both a financial crisis and a deep recession. While the recession officially lasted from December 2007 to June 2009, it took many years for the economy to recover to pre-crisis levels of employment and output. This slow recovery was due in part to households and financial institutions paying off debts accumulated in the years preceding the crisis along with restrained government spending following initial stimulus efforts. It followed the bursting of the housing bubble, the housing market correction and subprime mortgage crisis. According to the Department of Labor, roughly 8.7 million jobs (about 7%) were shed from February 2008 to February 2010, and real GDP contracted by 4.2% between Q4 2007 and Q2 2009, making the Great Recession the worst economic downturn since the Great Depression. The GDP bottom, or trough, was reached in the second quarter of 2009 (marking the technical end of the recession that is defined by "a period of falling economic activity spread across the economy, lasting more than a few months, normally visible in real GDP, real income, employment, industrial production, and wholesale-retail sales"). Real (inflation-adjusted) GDP did not regain its pre-crisis (Q4 2007) peak level until Q3 2011. Unemployment rose from 4.7% in November 2007 to peak at 10% in October 2009, before returning steadily to 4.7% in May 2016. The total number of jobs did not return to November 2007 levels until May 2014. Some areas, such as jobs in public health, have not recovered as of 2023. Households and non-profit organizations added approximately $8 trillion in debt during the 2000–2008 period (roughly doubling it and fueling the housing bubble), then reduced their debt level from the peak in Q3 2008 until Q3 2012, the only period this debt declined since at least the 1950s. However, the debt held by the public rose from 35% GDP in 2007 to 77% GDP by 2016, as the government spent more while the private sector (e.g., households and businesses, particularly the banking sector) reduced the debt burdens accumulated during the pre-recession decade. President Barack Obama declared the bailout measures started under the Bush administration and continued during his administration as completed and mostly profitable as of December 2014. In 2016 China surpassed the United States as the world's largest economy when measured by purchasing power parity (PPP).[a] Conflicts The considerable dependence of the industrialized world on oil starting in the 1930s, with much of the proved oil reserves situated in Middle Eastern countries, became evident to the U.S., first in the aftermath of the 1973 world oil shock and later in the second energy crisis of 1979. Although in real terms oil prices fell back to pre-1973 levels through the 1980s, resulting in a windfall for the oil-consuming nations (especially North America, Western Europe, and Japan), the vast reserves of the leading Middle East producers guaranteed the region its strategic importance. By the early 1990s the politics of oil still proved as hazardous as it did in the early 1970s. Conflict in the Middle East triggered yet another international crisis on August 2, 1990, when Iraq invaded and attempted to annex neighboring Kuwait. U.S. officials feared that Hussein was then on the verge of armed conflict with oil-rich Saudi Arabia, a close ally of Washington's since the 1940s. The United Nations condemned the invasion as an act of aggression; President Bush compared Hussein to Adolf Hitler and declared that if the United States and international community did not act, aggression would be encouraged elsewhere in the world. The Security Council gave Iraq a deadline to leave Kuwait, but Saddam Hussein ignored it, and the Security Council authorized a military response. The war began in January 1991, with U.S. troops forming the majority of the coalition which participated in Operation Desert Storm. By the time Iraqi troops withdrew from Kuwait in late February, Iraq had lost approximately 20,000 troops, with some sources citing as many as 100,000 casualties on the Iraqi side. In December 1992, President Bush sent troops to join the UN Operation Restore Hope, a multi-national effort to restore order and provide humanitarian aid in Somalia, which was torn by civil war, famine, and warlords. By the summer of 1993, the situation had deteriorated. After 24 Pakistani soldiers were killed in June 1993, the UN passed a resolution calling for the arrest and trial of those responsible for the attack. Under the leadership of newly elected President Bill Clinton, U.S. forces launched a concentrated attack on Aidid's stronghold in Mogadishu in Operation Gothic Serpent. In October 1993, 18 soldiers were killed and 84 were wounded in the Battle of Mogadishu. Following the attack, Clinton ordered U.S. forces withdrawn from the region, with the last being withdrawn by 1995, and fired his Secretary of Defense Les Aspin who had not sent adequate forces. In the mid-1990s, the United States was involved in the Bosnian War through the North Atlantic Treaty Organization (NATO), most notably the 1995 bombing campaign, which finally led to the Dayton Peace Agreement which ended the war by the end of 1995. In early 1998, the region became volatile again as war erupted between the army of the Federal Republic of Yugoslavia and the Kosovo Liberation Army, a guerrilla group. A 1999 NATO bombing campaign struck Yugoslavia, resulting in the deaths of hundreds of Yugoslavian soldiers and civilians. As a result, Yugoslavia withdrew from Kosovo and Kosovo became an independent state. President Clinton also ordered cruise missile strikes on Iraq in 1996 and bombing attacks on Iraq in 1998, which were launched in response to Saddam Hussein's violation of several UN resolutions, including repression of ethnic minorities (Kurds) and removing UN weapons inspectors. The 1998 campaign, in particular, was meant to de-stabilize the Iraqi government and degrade the power of Hussein. Clinton also signed the Iraq Liberation Act to appropriate funds to Iraqi opposition groups in the hopes of overthrowing Hussein's regime and establishing democracy. Throughout the 1990s, the United States also played an active role in peace efforts in the Israeli–Palestinian conflict. President Clinton, Israeli Prime Minister Yitzhak Rabin, and Palestinian Prime Minister Yasser Arafat met and signed the Oslo Accords in 1993, which called for the gradual ceding of control of Palestinian areas to the Palestinians in exchange for peace. However, Rabin was assassinated in 1995 and by 2000, the Camp David Summit failed to yield a new agreement. The 1990s also featured a series of increasingly violent attacks associated with Islamist terrorists, including al-Qaeda, a radical Islamist militant organization led by Osama bin Laden. On February 26, 1993, a truck bomb was detonated at the World Trade Center in New York City, killing six civilians and injuring 919 others, 88 firefighters, and 35 police officers. The attack was intended to destroy the foundation of the North Tower, knocking the tower into the South Tower, which would destroy both buildings and kill thousands of people. While this did not happen, the bomb caused considerable damage to the lower levels of the North Tower. In 1994, four men were convicted of carrying out the bombing and in 1997, two men were convicted for their roles, including the truck driver and the mastermind, Ramzi Yousef. On June 25, 1996, members of Hezbollah Al-Hejaz bombed the Khobar Towers, a complex in Khobar, Saudi Arabia, where members of the United States Air Force were being housed, killing 19 American airmen and injuring over 300 other people. On August 7, 1998, Al-Qaeda bombed the U.S. embassies in Kenya and Tanzania, killing 224 people, including 12 Americans. The U.S. launched cruise missile strikes on a terrorist training camp in Afghanistan, yet this failed to destroy al-Qaeda's vast network. On October 12, 2000, al-Qaeda militants bombed the USS Cole off the coast of Yemen, killing 17 U.S. sailors and severely damaging the ship. On the morning of September 11, 2001, four airliners were hijacked by 19 members of the terrorist organization al-Qaeda. The first hijacked airliner, American Airlines Flight 11, struck the North Tower of the World Trade Center at 8:46 A.M. (EST) in New York City; with a second, United Airlines Flight 175, striking the South Tower less than twenty minutes later at 9:03 A.M. (EST), resulting in the collapse of both 110-story skyscrapers, and the destruction of the World Trade Center. The third hijacked plane, American Airlines Flight 77, was crashed into the Pentagon (the headquarters of the United States Department of Defense) in Arlington County, Virginia, demolishing a section of the outer southwest facing wall. After passengers discovered that their plane, United Airlines Flight 93, was going to be used as a missile, they attempted to regain control of the aircraft which had been redirected towards Washington, D.C. However, the hijackers crashed the plane close to a rural community near Shanksville, Pennsylvania. It is believed that the target of Flight 93 was either the White House or the Capitol. In total, the attacks killed 2,996 people—2,507 civilians, 343 firefighters, 72 law enforcement officers, 55 military personnel, and the 19 terrorists. The 9/11 attack was the single deadliest international terrorist incident and the most devastating foreign attack on American soil since the Japanese surprise attack on Pearl Harbor on December 7, 1941. It refocused American attention to a long war on terrorism, beginning with an attack on al-Qaeda and its Taliban supporters in Afghanistan. Following the 9/11 attacks, Congress passed the Authorization for Use of Military Force Against Terrorists, authorizing the president "all necessary and appropriate force against the nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001." This act resulted in the 2001 invasion of Afghanistan, in President George W. Bush's broader global war on terrorism. The objective of the 2001 invasion, known as Operation Enduring Freedom, was to remove the Islamic fundamentalist Taliban lead government from power in Afghanistan, and to capture top level al-Qaeda leaders, including its founder Osama bin Laden. The invasion, fought in conjunction with the U.S.'s NATO allies, began on October 7, 2001, quickly leading to the overthrow of the Taliban government and implementation of Hamid Karzai as Afghanistan's interim president. In early 2002, after the Battle of Tora Bora and success with Operation Anaconda, the United States began focusing on military intervention in Iraq, shifting military and intelligence resources away from Afghanistan in the war on terror, with U.S. Secretary of Defense Donald Rumsfeld stating in May 2003 that the "major combat" in the conflict was over. With the approval of the new Afghan Constitution by the Loya jirga and election of President Karzai in 2004, Afghanistan later held its first parliamentary elections in over 30 years in 2005. With a total of 22,000 U.S. troops deployed in Afghanistan by May 2006, the U.S. joined in the ISAF lead Operation Mountain Thrust. In the attempt to quell the Taliban insurgency in southern Afghanistan, more than 1,000 insurgents and 150 ISAF troops were killed in the two-month operation, being the bloodiest period since the start of the war in 2001. With ISAF assuming complete command of security forces in Afghanistan in October 2006, the U.S. saw mounting skepticism from European allies over the war at the 2006 Riga summit. U.S.–Afghan diplomatic relations began to flare after the August 2008 Azizabad airstrike in Herat Province, which killed 91 civilians, including 60 children and 15 women. The attack sparked protest over "collateral damage"; with a 40% increase in civilian deaths in 2008. In September 2008 President Bush announced he would shift 4,500 US Armed Forces troops from Iraq to the conflict in Afghanistan. This was followed with recently elected President Barack Obama announcing in February 2009 that the United States would deploy an additional 17,000 troops to Afghanistan. The Obama administration also later announced a "troop surge" of an additional 30,000 US military forces to be deployed in the summer of 2010, and to begin withdrawals of the 100,000 total US troops in July 2011. With the surge in effect, the NATO-led International Security Assistance Force (ISAF) launched Operation Moshtarak, an offensive determined to eliminate Taliban insurgents from Helmand Province. At 15,000 troops, it was the largest joint operation of the war. After a 2010 profile on US Army general and ISAF Commander Stanley McChrystal was published in the magazine Rolling Stone, McChrystal was forced to resign from his position after making controversial remarks about Obama administration officials. President Obama then announced ISAF to be commanded by General David Petraeus. On May 1, 2011, President Barack Obama announced that the US conducted an operation that killed al-Qaeda leader Osama bin Laden at his compound in Abbottabad, Pakistan. The announcement drew worldwide praise, with spontaneous celebrations at Ground Zero, Times Square, and outside of the White House. The raid on bin Laden's compound in Abbottabad led to a rise in diplomatic tensions between the US and Pakistan. With civilian deaths from the United States' drone program in so-called "signature strikes", the 2011 NATO attack in Pakistan, which led to the deaths of 24 Pakistani military officers, and the closure of NATO supply lines to neighboring Afghanistan, Pakistan–United States relations remain fractured as a result of the war on terror. In mid-2011 Obama announced the start of the withdrawal of the additional 33,000 troops deployed from the 2010 troop surge. By December 2011, the first round of 10,000 troops were withdrawn, with the second round of 23,000 troops later withdrawn in September 2012. As of February 2014 a total of 2,307 US troops were killed and 19,656 injured due to the Afghanistan War. Estimates from the Costs of Wars Project based at Brown University's Watson Institute for International Studies also suggest that between 16,725 and 19,013 Afghan civilians died as a result of the war. The International Security Assistance Force ceased combat operations and was disbanded in December 2014, with a small number of troops remaining behind in an advisory role as part of ISAF's successor organization, the Resolute Support Mission. Unable to eliminate the Taliban through military means, coalition forces (and separately, the Afghan government led by Ashraf Ghani) turned to diplomacy to end the conflict. In his State of the Union address in January 2002, President George W. Bush called Iran, Iraq, and North Korea an "axis of evil". The Bush administration later began making a public case for an invasion of Iraq, accusing them of violating the 1991 UN-imposed ceasefire, supporting terrorism and being in possession of weapons of mass destruction (later, the latter of these accusations were proved to be false, and the first two are considered very dubious by most historians). Some important allies of the U.S., including India, Japan, Turkey, New Zealand, France, Germany, and Canada, did not believe that the evidence for the President's accusations was well-founded enough to justify a full-scale invasion, especially as military personnel were still needed in Afghanistan. The UN Security Council did not approve of the invasion, and the U.S. therefore provided most of the forces in the invasion of Iraq. With the support of a coalition whose major partners included the United Kingdom, Australia, Poland, Spain, and Italy, Iraq was invaded on March 20, 2003. After six weeks of combat between the coalition and the Iraqi army, the invading forces had secured control of many key regions; Hussein had fled his palace, his regime clearly over; on May 1, President Bush declared, under a sign reading "mission accomplished", that major ground operations were at an end. Saddam Hussein's sons Qusay and Uday were killed by U.S. forces; Saddam himself was captured in December 2003 and taken into custody. Nevertheless, fighting with the Iraqi insurgency continued and escalated through the 2004 U.S. national elections and beyond. With casualties increasing and the cost of the invasion and reconstruction of Iraq estimated at over $200 billion, the war has lost about one-third of its supporters in the U.S. since the end of major operations was announced. Contemporary polls suggested that international displeasure with the United States was at an all-time high, with a majority of people in Europe believing that the country was too powerful and acted mainly in self-interest, and a vast majority in predominantly Muslim nations believing that the United States was arrogant, belligerent, or hateful to Islam. As the situation in Iraq became increasingly difficult and deadly, policymakers began looking for new options. This led to the formation of the Iraq Study Group, a nonpartisan commission chaired by James Baker and Lee H. Hamilton. This produced a variety of proposals; some of the more notable ones were to seek decreased US presence in Iraq, increased engagement with neighboring countries, and greater attention to resolving other local conflicts, such as the Israeli–Palestinian conflict. The recommendations were generally ignored, and instead, President Bush ordered a surge of troops to Iraq in 2007 and 2008. Violence in the country declined in 2008 and 2009, and the US combat role ended in August 2010. US forces were withdrawn in large numbers in 2009 and 2010, and the war was declared formally over in December 2011. Domestic terrorism The 1990s and 2000s (decade) became known for several incidents of domestic terrorism, usually perpetrated by those dissatisfied with actions of the federal government, big business, or other aspects of American society. Throughout the 1970s and 1980s, a mysterious man known in the media as the "Unabomber" sent mail bombs to figures in the academic and airline industries for various reasons. After a lull, he began another mail bombing campaign in earnest, beginning in 1993. Two people were killed in the mid-1990s and an exhaustive and expensive investigation by the FBI coupled with intense national media interest in the story resulted in the identification and arrest of the perpetrator Theodore Kaczynski, who was sentenced to life in prison. On April 19, 1995, a truck bomb was detonated outside the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma, killing 168 people and injuring over 600. The bombing became the deadliest act of domestic terrorism in the United States and led to sweeping reforms in United States federal building security. The attack's perpetrator, Timothy McVeigh, was an anti-government extremist who used the Waco Siege and Ruby Ridge incidents as justification for his retaliation against the federal government. While McVeigh wanted to specifically target the federal agencies involved in the Waco siege, such as the ATF and DEA, the bombing killed many innocent civilians, including 19 children. McVeigh was executed in 2001 and his accomplice Terry Nichols was sentenced to life in prison. In July 1996, in the midst of the 1996 Summer Olympics at Centennial Olympic Park in Atlanta, Georgia, a homemade bomb was detonated, resulting in the deaths of 2 people and injuring over 100. This was followed by similar attacks at two abortion clinics and a lesbian nightclub. In 2003, suspect Eric Robert Rudolph was arrested and sentenced in 2005 to five life sentences for these attacks. In 2001, only days after the September 11 attacks, letters laced with anthrax were sent to several individuals, including prominent news personalities and government officials. The letters killed 5 people and infected a further 17. This incident of bioterrorism was initially blamed on international terrorist organization al-Qaeda, but in 2008, was determined to stem from a Maryland scientist by the name of Bruce Edward Ivins, who committed suicide before he could be prosecuted. Societal trends The crime epidemic that had begun during the late 1960s finally reached its climax in the early 1990s before starting a steady decline during the Clinton administration. Nevertheless, ongoing addiction (involving sales of marijuana and cocaine) continued to be a major factor in crime in the United States. The overall rate of major crimes fell during the period. In 2009, the FBI estimated 1,318,000 violent crimes occurred nationwide, 1,425,000 in 2000, down from the 1991 level of 1,912,000. Measured per capita, this was a 43% drop in violent crime rates. At the time, it was believed that crime had declined because of stricter judicial sentencing practices, the implementation of Three Strikes laws, improving law enforcement technology that made it easier to catch felons, and the end of the crack epidemic. But later statistical assessments ruled out most of these explanations, and tended to find that factors such as greater prosperity, lower alcohol consumption, generation-specific cultural effects, improved security technology, and decreases in leaded petrol had probably caused most of the decline, while public policy conversation began to regret the incarcerative policies of the preceding decades. In the 1990s and 2000s (decade), a number of highly publicized assaults against lesbian, gay, bisexual, and transgender people occurred in the United States. The most well known of these was the murder of Matthew Shepard in Wyoming after two young men kidnapped, tortured, and murdered him in 1998. In 2009, Congress passed the Matthew Shepard Act, which extended the hate crime law to women, the disabled, and gays, lesbians, bisexuals, and transsexuals. A spate of school shootings rocked the country in the late 1990s and the 2000s, the most notable being the 1999 Columbine High School massacre, that left 15 people dead, including both perpetrators Eric Harris and Dylan Klebold. The actions of Harris and Klebold would go on to influence many future mass killers. Others include the Westside Middle School shooting (1998), the Red Lake shootings (2005), the West Nickel Mines School shooting (2006), the Virginia Tech shooting (2007), and the Northern Illinois University shooting (2008). Those shootings led to increased debate over gun politics and media violence, as well as an increased focus on mental health, school safety, and anti-bullying. The Capital Region was struck by the Beltway sniper attacks, a series of sniper attacks on civilians and federal workers by two gunmen over a month-long period in October 2002. The attackers killed 10 people and injured three. Two men were arrested and convicted. During the 2000s a series of high-profile child abduction cases occurred, including Danielle van Dam (2002), Samantha Runnion (2002), Elizabeth Smart (2002), Carlie Brucia (2004), and Jessica Lunsford (2005). These incidents led to a public outcry and demands for stricter laws against sex offenders, the most notable of which was Jessica's Law. In 1992 riots occurred in Los Angeles after four police officers were acquitted in the beating of black motorist Rodney King. The riots occurred primarily in South Central Los Angeles, a predominantly black and Hispanic area. Fifty-five people were killed and more than 2000 were injured. 3,600 fires were set, destroying over 1,000 buildings and widespread looting occurred, especially of businesses owned by Korean Americans. In all, nearly $1 billion in damage was caused. In November 2009 US Army major Nidal Malik Hasan killed 13 fellow soldiers and injured 30 in the Fort Hood shooting in Killeen, Texas. While the act was called terrorism by some due to Hasan's Muslim heritage, the attack was ruled out by the FBI to have been perpetrated by a terrorist organization. On September 16, 2013, another mass murder on a US military base surpassed the incident when a former navy reservist fired a shotgun at the Washington Navy Yard Shooting, killing 12 civilian contractors and injured four more at the headquarters of the Naval Sea Systems Command (NAVSEA) in Southeast Washington, D.C. On January 8, 2011, U.S. Representative Gabby Giffords was the target of an assassination attempt, when a gunman went on a shooting spree, critically injuring Giffords, killing federal judge John Roll and five other people, and wounding 14 others. On July 20, 2012, a man shot 70 people (up to that time, the highest number of victims of any mass shooting in American history) at a movie theater in Aurora, Colorado, killing 12 and injuring 58 others. On April 15, 2013, two bombs exploded near the finish line of the Boston Marathon in Boston, Massachusetts, killing three people and injuring over 280. Three days later, suspects Tamerlan and Dzhokhar Tsarnaev led the Boston Police Department on a high speed chase, after killing one officer at the Massachusetts Institute of Technology. Tamerlan was killed in a shootout with police and a seriously injured Dzhokhar was taken into custody in nearby Watertown the following day. On December 2, 2015, in the 2015 San Bernardino attack, 14 people were killed and 22 were injured in a mass shooting at a workplace Christmas party at the Inland Regional Center in San Bernardino, California. Both a workplace shooting and a terrorist attack, the incident was perpetrated by Rizwan Farook, a healthcare worker who was employed at the facility, and his wife Tashfeen Malik. The pair were US citizens of Pakistani descent who had become radicalized and had expressed a commitment to jihadism prior to the attack. The attack also included an attempted bombing. Four hours after the attack, the perpetrators were killed by police in a shootout that left two officers injured. The population of the United States would increase between each of the decennial censuses held each 10 years. From the early 1990s to the mid 2010s vast technology changes would be seen in the United States such as: the number of wireless phones surpassing the number of landline phones, Internet usage becoming common among the population along with a large expansion in the number of actual internet users. The usage of landline phones would decline while that of wireless phones would increase. The percentage of American adults having wireless instead of landline would be surpassed in December 2008 and the percent of homes being solely wireless would surpass those having both wireless and landline in June 2015. According to Our World in Data the usage of the internet grew during this time period going from 2.98 million internet users in 1991 to 281.59 million by 2016. 2008 would mark the first time that the country with the most internet users (the number of people who use the internet) was not the United States as China surpassed the country that year. Dial up internet was initially the most common way to connect to the internet but was later surpassed by broadband internet. Internet based services that had their debuts were such as: Uber (originally known as UberCab until rebranding in October 2010) in June 2010 which initially operated in San Francisco, and Airbnb in 2008. Social media platforms from or based in the United States that launched included Instagram in October 2010, and Snapchat in 2011 by 3 Stanford University students. A number of different events would happen pertaining to the United States relating to space exploration during this period. The United States would participate in the now Russian Mir space station sending 7 astronauts to the station between 1994 and 1998 in 10 separate Space Shuttle missions. However Mir was later deorbited in 2001 and replaced with the International Space Station. The Space Shuttle program would be continued. In 2003, Space Shuttle Columbia burned up in the atmosphere upon its reentry to Earth. After the shuttle burned up killing all 7 crew members an official governmental investigation was carried out and President Bush addressed the country about the shuttle. The Space Shuttle program was retired in 2011 doing its final flight that year. Voyager 1, launched in 1977 by NASA became the first spacecraft to enter interstellar space in 2012. While Voyager 2 (also launched in 1977 by NASA) entered interstellar space in 2018 becoming the second spacecraft to do so. The first flyby of Pluto ever was done by NASA's New Horizons probe in 2015. The Dawn space probe launched by NASA in 2007 visited the asteroid Vesta in 2011 being the first spacecraft to orbit an asteroid before later leaving next year to visit the dwarf planet Ceres entering its orbit in 2015. Dawn would be the first space craft to visit and orbit a dwarf planet. The divorce rate which was previously much higher in the 1980s and 1990s after divorce became much easier to do, started to lower in the early 21st century with it declining. Starting in 2004 the percentage of adults who were from 18 to 29 and happened to be single or never married grew while the number of those who were "currently married" declined. In terms of marriage, the median age increased for both men and women which was an ongoing trend since the late 1950s. While the number of marriages per 1,000 people declined between 1991 and 2016 along with the percentage of households where the head of house was a married also declined. A new common practice relating to families that came about was gender reveal parties where the sex of the baby is revealed which became popular starting in 2008 after a blogger posted about doing it. Usually with gender reveal parties if it is a boy the color blue is used and for girls pink is used. The United States hosted the 1996 Summer Olympics in Atlanta. During the 1996 Summer Olympics, the United States won the most amount of medals in total. The United States also hosted the 2002 Winter Olympics in Salt Lake City. However compared to the 1996 Summer Olympics, the United States won the 2nd highest amount of medals overall. Disasters On August 24, 1992, the category-five Hurricane Andrew made landfall in South Florida, devastating the southern suburbs of Miami, including Homestead, Kendall, and Cutler Ridge. Two days later, the storm made landfall again in a sparsely populated part of Louisiana, with relatively less damage than in Florida. The storm killed 26 people directly, 39 indirectly. With $26 billion in damage, it became the costliest storm in history at that time. The storm was known for many controversies including the sluggish federal response, which may have impacted President George H. W. Bush's image on domestic issues, as well as poor housing construction which may have led to such high levels of destruction. In March 1993, a massive storm, known as the "Storm of the Century" or "Superstorm" struck the Eastern Seaboard of the United States. The storm set low pressure records; produced hurricane-force winds, storm surge, and killer tornadoes in Florida; and produced snowfall up to 2 feet (61 cm) across many portions of the Eastern United States. The storm was particularly crippling to the Southern United States, where places like Birmingham, Alabama received one-and-a-half feet of snow and record low temperatures, highly unusual for the region. In all, 300 deaths were attributed to the storm and $6 billion in damage was caused. The Great Flood of 1993 affected the Midwestern United States in the spring and summer of that year, devastating large portions of the Mississippi and Missouri River Valleys and their tributaries. Many small towns were devastated and agricultural losses were significant. 10,000 homes were destroyed and 15 million acres (61,000 km2) of agricultural lands were inundated. 50 people perished in the floods and $15 billion in damage was done. In the early morning hours of January 17, 1994, the San Fernando Valley region of Los Angeles was hit by a 6.7 magnitude earthquake, known as the "Northridge earthquake". The quake killed more than 70 people and injured 9,000. Most of the fatalities were attributed to collapsed buildings, parking structures, or freeways. Striking an urban area, it was very destructive, causing $20 billion in damage. In July 1995, the city of Chicago was hit by a heat wave that had severe repercussions. During a five-day spell from July 12 to 16, the high temperature hovered from the mid 90s to the mid 100s. The heat index pushed 120 degrees on many days. The heat wave resulted in the deaths of over 700 people, many of whom were black, elderly, or poor. The event brought increased attention to these segments of the population and the importance of reaching out to them during heat waves, as well as the concept of the urban heat island effect, in which urban environments exacerbate heat and humidity levels. Additionally, power failures and lack of adequate warning and general preparedness aggravated the situation and may have contributed to such high fatalities. In January 1996, the Blizzard of 1996 affected the Northeastern and Mid-Atlantic United States, dumping up to 36 inches (91 cm) of snow on many areas, crippling major American cities like Washington, D.C., Baltimore, Philadelphia, New York City, and Boston. The storm killed 150 people and caused $3 billion in damages. On May 3, 1999, a violent tornado outbreak struck the Southern Great Plains, predominantly Oklahoma. The most destructive tornado was an F5 tornado that struck Oklahoma City and the suburb of Moore. The tornado is one of the most prominent examples of a tornado striking a major urban area and became the first tornado to incur over $1 billion in damages. In all, the outbreak resulted in 50 deaths and over 600 injuries. In 2004, four hurricanes—Charley, Frances, Ivan, and Jeanne—struck the state of Florida in a one-month timespan, resulting in over 100 U.S. deaths and nearly $50 billion in damage combined. Out of the four hurricanes, Ivan was the deadliest in the U.S., while Charley was the most destructive. 2005 brought the second-most active Atlantic hurricane season in recorded history, only beaten by 2020. In August 2005, the powerful Hurricane Katrina struck the Gulf Coast region. Katrina broke the levees of New Orleans, Louisiana and flooded 80% of the low-lying city. Extensive devastation and flooding also occurred from Mobile, Alabama west to Beaumont, Texas, with the Mississippi coastline especially hard hit. At least 1,800 people died in the worst domestic calamity since the 1928 Okeechobee hurricane. Port facilities, oil rigs and refineries in the Gulf region were damaged, further increasing already high U.S. fuel prices. Residents of New Orleans, many of whom were impoverished and unable (or unwilling) to evacuate before the storm, were trapped for days by the flood waters. Tens of thousands had to be rescued by the U.S. military from their rooftops or from unsanitary and dangerous shelters in public buildings. State and local authorities were overwhelmed by the scale of the events. Their response to the disaster, as well the federal government's, were harshly criticized by legislators and citizens who saw in the confusion a dangerous lack of readiness and inability to preserve public safety. President Bush promised that the federal government would underwrite the rebuilding of New Orleans and other storm-damaged areas, the cost of which was estimated to run as high as $200 billion. Only weeks after Katrina, Hurricane Rita struck the Texas/Louisiana border in September. Rita caused the largest evacuation in U.S. history, as millions of people fled the Houston area, as well as portions of Louisiana. Rita resulted in over 100 fatalities, the vast majority of which were indirect, occurring during the evacuation or in the aftermath of the storm. Additionally, $10 billion in damage was attributed to Rita. Later in the season, Hurricane Wilma struck the state of Florida in October 2005, killing 35 people and doing $20 billion worth of damage. The storm yielded the lowest pressure value ever recorded in history before making landfall in Florida, making it the most intense storm on record. On Super Tuesday in February 2008, in the midst of heated primary elections in multiple states, a destructive tornado outbreak hit the Mid-South region, spawning dangerous nighttime twisters across the region. A total of 87 tornadoes were reported. Over 60 people were killed across Tennessee, Kentucky, Arkansas, and Alabama and hundreds were injured. Losses exceeded $1 billion. The outbreak was the deadliest outbreak in the US in 23 years, and brought renewed attention to the dangers of nighttime tornadoes, winter tornadoes, and the vulnerability of populations in the Southern United States. In September 2008, after two straight years of not being affected by a serious hurricane, Hurricane Gustav caused $18 billion in damage in Louisiana, and a few weeks later, the Galveston, Texas and Houston, Texas areas were devastated by Hurricane Ike with over $31 billion in damage, making Ike the third most destructive hurricane ever to hit the United States behind Hurricanes Andrew and Katrina. Over 100 people were killed. The hurricanes also caused gas prices to spike to around $4 per gallon. In the spring of 2011, several major tornado outbreaks affected the Central and Southern United States. Forty-three people were killed in a tornado outbreak from April 14–16. Approximately 350+ people were killed in a tornado outbreak from April 25–28, the deadliest US tornado outbreak in 75 years (since the 1936 Tupelo-Gainesville tornado outbreak). States particularly hit hard by the outbreaks included Oklahoma, Arkansas, Mississippi, Tennessee, Georgia, North Carolina, Virginia, and most especially, Alabama, which sustained over 250 fatalities alone. The latter outbreak produced $10 billion in damage, making it the costliest tornado outbreak in history. On May 22 an EF5 tornado devastated Joplin, Missouri, killing 154, injuring over 1,000 people, and causing $1–3 billion in damage, making it the deadliest single US tornado in 64 years and the costliest single tornado of all time. In August 2011, Hurricane Irene was the first hurricane to make landfall since Ike in 2008, striking the Eastern Seaboard of the United States, making landfalls in North Carolina, New Jersey, and New York. The storm killed at least 45 people and caused $10 billion in damage. The storm was particularly notable for its extensive flooding in the Northeast, and a couple days later, Tropical Storm Lee made landfall in Louisiana, its remnants tracking to the Northeast for even more devastating floods. In October 2012, Hurricane Sandy struck the East Coast of the United States, making landfall near Atlantic City, New Jersey. The storm knocked out power to millions of people and caused flooding in parts of New York City along with devastation to the Jersey Shore and portions of Long Island and Staten Island. The storm has been blamed for 121 fatalities and is estimated to have caused at least $50 billion in damage. In May 2013, at least 24 people were killed, 377 people were injured, and $1.5 to $3 billion in damage was caused when an EF5 tornado struck the Oklahoma City suburb of Moore, which was hit by a deadly and destructive F5 tornado only 14 years prior. Notable aviation disasters in the 1990s included TWA Flight 800 crashing off the coast of Long Island, en route to Paris, France, on July 17, 1996, due to an explosion of the fuel tank, killing 230 and EgyptAir Flight 990 crashing south of Nantucket, Massachusetts, en route to Cairo, Egypt, on October 31, 1999, due to deliberate crashing by the first officer, killing 217. Shortly after the 9/11 terrorist attacks, the second-deadliest U.S. aviation incident occurred when American Airlines Flight 587 crashed in Queens, New York, en route to the Dominican Republic, on November 12, 2001, due to overuse of rudder controls by the pilot to counteract turbulence, killing 265 (including 5 on the ground). On February 1, 2003, the Space Shuttle Columbia disintegrated upon re-entry to the Earth over parts of Texas and Louisiana during STS-107, resulting in the deaths of all seven astronauts. The incident resulted from a piece of foam insulation that fell off during launch, which struck the shuttle, creating a hole that allowed hot gases to penetrate the shuttle during re-entry. In the aftermath of the disaster, the Space Shuttle program was suspended for 29 months as NASA investigated the incident and made plans to prevent future tragedies. On February 17, 2003, a stampede occurred at the E2 nightclub in Chicago, after an incident involving pepper spray, resulting in the deaths of 21 people. Three days later, on February 20, 100 people perished and over 200 were injured in The Station nightclub fire in West Warwick, Rhode Island, when pyrotechnics ignited flammable sound-proofing during a performance by the band Great White. Both incidents brought attention to the need to crack down on building, fire, and safety code violations to prevent future tragedies. A porch collapse that killed 13 and seriously injured 57 in June 2003 in Chicago further emphasized the problems with building code violations in the United States. On August 1, 2007, the I-35W Mississippi River bridge in Minneapolis collapsed into the Mississippi River, killing 13 people and injuring over 50. The bridge was under construction at the time. The incident brought to attention the need to inspect and rehabilitate the aging infrastructure system in the United States. On April 20, 2010, an offshore oil drilling rig, the Deepwater Horizon, exploded and burned off the coast of Louisiana in the Gulf of Mexico. Dozens of workers fled the flames and were rescued by lifeboats and helicopters, however 11 were killed and 17 were injured in the incident. The rig burned for 36 hours before sinking. On April 24, it was discovered that a damaged wellhead was leaking oil into the Gulf of Mexico at a rapid rate. For approximately 90 days, tens of thousands of barrels of oil leaked into the ocean every day, resulting in the largest oil spill in United States history. The wellhead was successfully contained in mid-July, stopping the flow, and the well was completely sealed on September 18. Despite significant efforts to protect coastlines, the spill had devastating impacts on the environment and the economies of the Gulf Coast states. The Obama administration, and civil settlements with the Justice Department and Gulf Coast states, ordered well operator BP responsible for the $15 billion cleanup costs. The spill resulted in negative public approval ratings of the US government, the Obama administration, and BP, for their handling of the spill, with BP suffering the worst ratings. Energy issues After 1970 the U.S. began importing oil, as consumption kept rising and the nation's oil fields became less productive. Throughout the 1990s the world price of crude oil ranged between $10 and $40, and the average price at the pump did not exceed $1.40. Oil prices tripled after 2002, peaking at $147 in July 2008, about $4 a gallon; the price has continued to fluctuate widely. The theme of "energy independence" led to legislation mandating more fuel efficient autos—even electric vehicles—and more efficient use of energy, ranging from insulation to new light bulbs. Even worse than the high price, was the fear of shortages. Many proposals and pilot projects for replacement energy sources, from ethanol to wind power and solar power were discussed and, indeed, funded by Congress after 2000. In the economic stimulus package signed by President Obama in early 2009, billions of dollars were allocated for research and development of new energy sources. While public attention focused on supplies from the Middle East, the main source was Canada. After 2007, new methods of extraction opened up vast new deposits of oil in the Bakken Formation in North Dakota and Montana. As much as two trillion dollars' worth of natural gas is potentially available in the Marcellus Formation deposits located in the historic 19th-century oil fields in Appalachia, stretching from West Virginia through Pennsylvania into western New York. However, there is sharp debate underway regarding the environmental impact on the region's fresh water supply. The question of drilling in the Arctic National Wildlife Refuge (ANWR) was highly controversial, as Republican proposals were blocked by the Democrats in Congress. Republicans in 2008 were campaigning for more offshore drilling, with the slogan "drill, baby, drill", but the 2010 Gulf oil spill put all new drilling on hold. Politics Following the success of the First Gulf War, George H. W. Bush enjoyed very high approval ratings as president. However, economic recession and a reneged campaign pledge dogged Bush, sinking his formerly high approval ratings from the high 80s to the lower 40s and upper 30s. In the wake of Bush's political problems, Bill Clinton won the 1992 contest with 43% of the vote in a three-way race against Bush's 38%. Independent candidate Ross Perot tapped the discontent of the electorate with both parties, drawing roughly evenly from both candidates to receive a record 19% of the popular vote, but no electoral votes. Perot's result qualified his Reform Party to receive Federal Election Commission matching funds for campaign contributions in the 1996 election, thus laying the groundwork for another three-way race during the 1996 presidential election. Aged 46 when he took office in January 1993, Clinton was one of the youngest presidents in US history and the first born after WWII. Historians and political analysts immediately referred to him as marking a "generational shift" in American politics similar to when John F. Kennedy had become the first president born in the 20th century. His promising to focus on and resolve some of the United States' many domestic issues, he entered office with high expectations. Immediately, however, he was hurt when he had to withdraw major nominees (over nonpayment of taxes). Clinton's surgeon general, Joycelyn Elders, attracted controversy over public remarks that "it would be good for parents to teach their children about masturbation". Much of his planned activity was overwhelmed by the intense debate over his proposal to permit gays to serve in the military. In addition, the president had a difficult time gaining the respect of the US military establishment due to having been painted as a Vietnam War draft dodger. The outcome was a new "don't ask, don't tell" compromise policy and loss of initiative in other areas. One early domestic victory of the Clinton administration was the enactment of the 1994 Assault Weapons Ban. The ban was widely decried by the Republicans, who allowed it to lapse in 2004 while they controlled both Congress and the presidency. Bill Clinton's proposal of a national health care system, championed by his wife Hillary Clinton, ignited a political firestorm on the right, which vigorously opposed it on the general principle that government size should be reduced, not expanded. The proposed system did not survive the debate. However Hillary Clinton did succeed, along with a bipartisan coalition of members of congress, in establishing the Children's Health Insurance Program. The New Deal, the Great Society, and Watergate helped solidify Democratic control of Congress, but the 1980s and early 1990s were a period of fragmentation of their coalition, when the popularity of Democratic incumbents as constituent servants masked growing disenchantment with Congress' governing capacities. The strongly liberal policies of Clinton's first two years in office were also a cause of controversy, and the Democrats suddenly lost control of the House and the Senate for the first time in four decades in the 1994 midterm elections. Once in power, House Republicans, led by Newt Gingrich, faced the difficulty of learning to govern after 40 years as the minority party while simultaneously pursuing their "Contract with America", which they unveiled on the steps of Congress on September 27, 1994. Along with strong backing from traditional Democrats and liberals, Clinton was able to garner the support of moderates[who?] who appreciated his centrist "New Democrat" policies, which steered away from the expansion of government services of the New Deal and Great Society and allowed him to "triangulate", taking away many of the Republicans' top issues. One example of such compromises was welfare reform legislation signed into law in 1996. The new law required welfare recipients to work as a condition of benefits and imposed limits on how long individuals may receive payments, but did allow states to exempt 20% of their caseloads from the time limits. Clinton also pursued tough[according to whom?] federal anti-crime measures, steering more federal dollars toward the war on drugs, and calling for the hiring of 100,000 new police officers. Compromise came with difficulty, though, as the parties failed to agree on a budget, causing the federal government to shut down in late 1995 into early 1996. By the end of his administration, the federal government had experienced the country's longest economic expansion and produced a budget surplus. The first year of the budget surplus was also the first year since 1969 in which the federal government did not borrow from the Social Security Trust Fund. The 1996 Democratic National Convention in late August that nominated Clinton sparked protests, such as the one whereby Civil Rights Movement historian Randy Kryn and 10 others were arrested by the Federal Protective Service; later on, in November's 1996 presidential election, Clinton faced Bob Dole, Republican Senator from Kansas. An uninspired insider, Dole failed to attract the support of the GOP base and the incumbent president pulled to victory in the November election. Ross Perot ran for a second time, but was not allowed at the debate between Clinton and Dole and failed to attract as much support as he had in 1992. As a sign of the general cynicism and voter apathy during this period, turnout for the election was only 49%. Many voters in 1992 and 1996 had been willing to overlook long-standing rumors of extramarital affairs by Clinton, deeming them irrelevant. These matters came to a head, however, in February 1998 when reports surfaced of ongoing sexual relations between Clinton and a White House intern, Monica Lewinsky. Clinton initially and vigorously denied the relationship; "I did not have sexual relations with that woman, Miss Lewinsky." His wife Hillary described the allegations as fraudulent smears dredged up by a "vast right-wing conspiracy." Clinton was forced to retract his assertions in August 1998 after the Lewinsky matter came under investigation by independent counsel Kenneth Starr. Clinton was impeached in the United States House of Representatives, but acquitted at his trial by the U.S. Senate. A public backlash forced Speaker Gingrich to resign after a poor showing in the 1998 midterm elections. In 1999, Republican Dennis Hastert of Illinois became Speaker of the House, a position he would hold until 2007, making him the longest-serving Republican Speaker of the House. Though his 2000 election had been the focus of intense controversy which led eventually to a U.S. Supreme Court ruling in Bush v. Gore where the court ruled 5–4 in the former's favor by siding with the State of Florida's official vote count, Governor George W. Bush was sworn in as president on January 20, 2001. This made the 2000 election the third presidential election in which the electoral vote winner did not receive at least a plurality of the popular vote. Early in his term, Bush signed a $1.3 trillion federal tax cut aimed at revitalizing the economy, but the wars in the Middle East as well as assorted domestic spending packages passed by the Republican Congress led to ballooning Federal deficits. Other laws enacted in his first term included the No Child Left Behind Act education reform bill in 2002, the Partial-Birth Abortion Ban Act in 2003 and the Medicare Prescription Drug, Improvement, and Modernization Act in 2004. The first eight months of his term in office were relatively uneventful; however, it had become clear by that time that the economic boom of the late 1990s was at an end. The year 2001 was plagued by a nine-month recession, witnessing the end of the boom psychology and performance, with output increasing only 0.3% and unemployment and business failures rising. On September 11, 2001, al-Qaeda terrorists hijacked four commercial airliners and attacked the World Trade Center and the Pentagon in the September 11 attacks, killing nearly 3,000 and injuring over 6,000 people. Osama bin Laden claimed responsibility for the attacks. President Bush ordered all flights grounded and U.S. airspace remained closed for the rest of the week. An emergency bailout package for the airline industry was passed, and stocks fell dramatically when markets re-opened the following week. In response to the attacks, the Bush administration and Congress passed the controversial PATRIOT Act, aimed at enhancing security, and established the Department of Homeland Security, a mass consolidation of many federal agencies charged with investigation, intelligence, and emergency management. A new Terrorist Finance Tracking Program monitored the movements of terrorists' financial resources but was discontinued after being revealed by The New York Times. Telecommunication usage by known and suspected terrorists was studied through the NSA electronic surveillance program. On October 7, 2001, the United States invaded Afghanistan as part of a global war on terrorism, aimed at rooting out al-Qaeda, the Taliban, and other terrorist organizations. In mid-2002, President Bush announced that Iraq possessed chemical and nuclear weapons and posed a "clear and present danger" to stability in the Middle East. Plans for a full-scale military invasion of the country began amid widespread controversy. Antiwar protests occurred around the US and numerous other countries, mostly carried out by left-wing organizations, but some on the right and various military and diplomatic figures also doubted the wisdom of this venture. Regardless, the invasion of Iraq commenced on March 20, 2003. The Iraqi Army disintegrated without much resistance and within three weeks, US troops entered Baghdad to an overjoyed mob of Iraqi civilians who proceeded to tear down the giant statue of Saddam Hussein in the middle of the city. Bush announced on May 1, 2003, from an aircraft carrier that major combat operations in Iraq were completed, with a "Mission Accomplished" banner serving as a backdrop. Although the war was initially popular, a guerrilla insurgency quickly began mostly by Al Qaeda operatives who had entered the country. Led by Abu Musab al-Zarqawi, a wave of bombings and beheadings of captives occurred, including the highly publicized killing of government contractor Nick Berg. Zarqawi was killed by US troops in 2005. Ineffective policing strategies led to a mounting death toll among soldiers, but eventually in 2007 a campaign known as "The Surge" began where the US Army launched a large-scale anti-terrorism offensive. Along with the help of Iraqi locals unhappy with the destruction caused by (largely foreigner) Al Qaeda agents, the surge resulted in the end of most major violence in the country. Late in 2003, Hussein was captured, and was subsequently put to trial before the Iraqi people and executed in 2006. Meanwhile, the economy recovered from the early 2000s economic recession, with GDP growth rising to 7% in the middle of 2003, with continued growth through the mid-2000s. The unemployment rate peaked at 6% in 2003, before falling in 2004 and 2005, and dropping below 5% in 2006 and 2007. President George W. Bush was re-elected in November 2004, defeating Democratic contender Senator John Kerry in the electoral vote, and receiving 50.7% of the popular vote against John Kerry's 48.3%. Republicans also made gains in both houses of Congress. President Bush's reelection was assured by public support for the war on terror, the dour Senator Kerry's lack of appeal to his voter base, and the excessive attacks made on the president by the left, which helped turn public opinion against them. In addition, it came out that Kerry, a Vietnam War veteran, had participated in antiwar protests after returning home in 1970, including throwing away his medals. Some major acts in President Bush's second term included the Energy Policy Act of 2005, the Safe, Accountable, Flexible, Efficient Transportation Equity Act, and the Troubled Asset Relief Program. After seeing high approval ratings for much of his first term, Bush's popularity plummeted to record lows in his second term, due to his handling of the prolonged Iraq War, Hurricane Katrina, and the 2008 financial crisis. Democrats swept to victory in the 2006 elections, making Representative Nancy Pelosi Speaker of the United States House of Representatives, the first woman in that position, and electing record numbers of women and minorities. Upon winning the elections, the Democrats drew up a 100-Hour Plan of policy proposals upon assuming power in Congress. Major components of the plan included a pay-as-you-go plan for reducing the deficit; enacting the 9/11 Commission recommendations; increasing the federal minimum wage to $7.25 an hour; allowing the government to negotiate directly with pharmaceutical companies to secure lower drug prices for Medicare patients; and ending large tax subsidies for big oil companies to help foster energy independence. The 110th Congress did little to influence the war in Iraq besides passing a non-binding resolution against the Bush administration's troop surge. In addition, the House of Representatives passed a $124 billion emergency spending measure for war funding with the stipulation of a phased troop withdrawal. President Bush vetoed the bill because of the proposal of scaling down forces, making this the second veto of his term. During the months of May–June 2007, Senator Ted Kennedy and other senators co-sponsored the Comprehensive Immigration Reform Act of 2007. The purpose of this bill called for immigration reform under the intent of bringing amnesty and citizenship. On June 28 the Senate voted 53–45 for cloture, with 60 votes needed, spelling the end to the 2007 Immigration Bill. In 2007, while US unemployment dropped to its lowest level since the year 2000, the housing bubble reached its peak and economic growth slowed down, and by December 2007, the United States entered the severe long-lasting Great Recession. By mid-2008, property values and the values of other assets plummeted, and the stock market crashed in October 2008, spurred by a lack of investor confidence as the liquidity of assets began to evaporate. With the decline in wealth and the lack of investor and consumer confidence, growth and economic activity came to a screeching halt and the job growth of previous years was soon wiped out, with mass layoffs and unemployment rising rapidly in late 2008, and continuing into 2009. Federal Reserve chairman Ben Bernanke told a federal commission in November 2009, "As a scholar of the Great Depression, I honestly believe that September and October of 2008 was the worst financial crisis in global history, including the Great Depression." Of the 13 most important US financial institutions, "12 were at risk of failure within a period of a week or two". The Federal Reserve and the Treasury cooperated by pouring trillions into a financial system that had frozen up worldwide. They rescued many of the large financial corporations from bankruptcy – with the exception of Lehman Brothers, which went bankrupt – and took government control of insurance giant AIG, mortgage banks Fannie Mae and Freddie Mac, and both General Motors and Chrysler. In October 2008, Bush sought, and Congress passed, the Emergency Economic Stabilization Act of 2008 (commonly referred to as the "bank bailout") with the goal of protecting the US financial system from complete collapse in the wake of the recession, which brought significant declines in the stock market. The bill provided federal government guarantees of up to $700 billion to troubled financial institutions through the Troubled Asset Relief Program (TARP). By 2010, only a fraction of that money was ever spent, as banks were able to quickly repay loans from the federal government or ended up never needing the money. Meanwhile, unemployment doubled to nearly 10%, with states such as California and Michigan especially hard hit. While the stock market rebounded by 2011, and corporate profits had recovered, unemployment remained over 9% into 2011. The recession was worldwide, with Europe and Japan hard hit, while China, India and Canada fared much better. The nation went into the 2008 election cycle having a Republican president and Democratic Congress both with extremely low approval ratings. New York Senator Hillary Clinton had the inside track for the nomination but faced an unexpected challenge from Barack Obama, the nearly unknown junior Senator from Illinois. The GOP nominated Arizona Senator John McCain. During the general election, Obama's youthfulness, charisma, and widespread media support proved effective against McCain, seen as a stodgy Washington insider. In addition, his relatively advanced age (72) and injuries from captivity in the Vietnam War drew doubts over his health and stamina. Overall disillusionment with the Republican Party and George Bush's administration did not help McCain's cause, and his choice of Alaska governor Sarah Palin as his running mate also drew some controversy. Obama also drew some doubts over his inexperience and controversial associations with Weather Underground founder William Ayers and Reverend Jeremiah Wright, the pastor of an African-American church Obama had attended for years who was discovered to have made anti-white sermons. The decisive event was the collapse of the national financial system over the summer, launching a severe worldwide depression. On November 4, 2008, Obama defeated McCain 365 to 173 in the electoral vote and 52.9% to 45.7% in the popular vote to become the 44th president of the United States, making history in becoming the first African American to be elected to the highest executive office. Part of the strong showing came from a surge of support from younger voters, African Americans, Hispanics and independents. Democrats made further gains in Congress, adding to the majorities they had won in 2006. Obama's early policy decisions addressed the Great Recession and have included changes in tax policies, foreign policy initiatives and the phasing out of detention of prisoners at the Guantanamo Bay detention camp in Cuba. Within a few weeks of taking office, the new president and Congress passed the American Recovery and Reinvestment Act of 2009, which was ostensibly aimed at recovering from the economic collapse. This entailed a $700 billion stimulus package for the economy, although there were considerable questions over the amount of money spent or its actual effectiveness. A domestic initiative passed by the 111th Congress and signed into law by President Obama was the Affordable Care Act, an important statute guaranteeing comprehensive medical coverage to all Americans, regardless of age, sex, pre-existing health conditions or ability to pay. The Don't Ask, Don't Tell Repeal Act, which allowed openly gay people to serve in the military, was enacted in 2010. In foreign policy, President Obama withdrew US troops from Iraq in large numbers, bringing the Iraq War to an end in December 2011. At the same time, he also increased troop levels in the Afghanistan War. Early in his presidency, he successfully negotiated the New START treaty with the Russian Federation, which made significant reductions in their nuclear arsenals. The US also maintained ongoing talks, led by Secretary of State Hillary Clinton, with North Korea over its nuclear weapons program, as well as with Israel and the Palestinian Authority over a two-state solution to the Israeli–Palestinian conflict. In May 2011, President Obama announced in a televised speech to the nation that al-Qaeda leader and culprit behind many deadly acts of terrorism (including the September 11 attacks) Osama bin Laden was killed by US forces at a compound in Abbottabad, Pakistan. Although the recession reached its bottom in June 2009 and began to move up again, voters remained frustrated with the slow pace of the economic recovery. In the spring of 2009, large protests erupted in Washington, DC from conservative groups who began calling themselves the "Tea Party" and who were particularly opposed to the controversial stimulus act. The Tea Party would end up in a few years as a springboard for a large-scale Republican revival. In the 2010 midterms, the GOP retook control of the House, although the Senate remained in Democratic hands. Under the new Congress, which had a Republican House and a Democratic Senate, President Obama and Congress clashed for months over whether or not to raise the debt ceiling and whether or not to extend the payroll tax cuts for middle-income citizens that Obama signed into law. After months of heated debate, the debt ceiling was ultimately raised and the tax cuts extended. However, Obama's approval ratings continued to hover at around 46%, while Congress had an even lower approval rating of 11%. In the 2012 presidential election, the GOP nominated former Massachusetts governor Mitt Romney. Much like John McCain four years earlier, Romney was largely seen as a tepid moderate and a Beltway insider who did not inspire the conservative base of the Republican Party, nor independents. He also drew controversy for his stand on Obamacare, which had been based on the system he implemented as Governor of Massachusetts. Obama defeated his opponent to win a second term, with a tally in the Electoral College by 332 to 206 and in the popular vote by 51.06% to 47.21%. The electoral map remained the same as 2008, with the exception of North Carolina and Indiana flipping back as red states, and the party balance in Congress remained largely unchanged. In the November 2014 midterm elections, the Republican Party took control of the Senate and expanded its majority in the House of Representatives, an event that portended an ill omen for the Democrats. On December 17, 2014, President Barack Obama announced a restoration of full diplomatic relations with Cuba for the first time since 1961. A deal between the United States and Cuba was brokered during 18 months of secret talks hosted by Canada, with a final meeting hosted by Pope Francis at the Vatican. Although the US embargo remains in effect and ordinary tourism by Americans is still prohibited, the United States will ease travel restrictions, release three Cuban spies, and open an embassy in Havana. The New York Times reported in January 2015: In short: The state of union, while far stronger than when Mr. Obama took office, remains troubled. The financial crisis has ended, with job growth picking up and the American economy among the world's strongest right now. Yet the great 21st-century wage slowdown continues, with pay raises for most workers still meager. In other positive news, the deficit has fallen sharply, thanks to a combination of slower health-cost growth and budget cuts (the latter championed by Republicans). Many more people have health insurance, thanks to Mr. Obama's health law. More people are graduating from college—although Mr. Obama is likely to fall short of his vow to have the United States lead the world in college graduates by 2020. On the negative side, climate change appears to be accelerating, creating serious health and economic risks. The fall in gasoline prices, though welcome for many struggling families, won't help the climate. And with Mr. Obama delivering his address the day after Martin Luther King's Birthday, it's also worth remembering that the country's racial divides remain deep, with African-Americans still far behind other Americans by many measures. On June 26, 2015, the Supreme Court ruled, 5–4, in the case of Obergefell v. Hodges that same-sex marriage was a constitutionally protected right under the 14th Amendment. Shortly before the ruling, polling showed the majority of Americans approving of same-sex marriage. The ruling was celebrated by many, and President Obama advertised his support for the ruling by coloring the White House in gay pride colors using lights. This ruling was not achieved without controversy, as it did little to change the minds of those that disapproved of homosexuality in general. In regards to the Supreme Court, President Obama faced three vacancies during his administration. Justice David Souter retired in June 2009 and the president nominated as his replacement Sonia Sotomayor, the first Hispanic Supreme Court Justice in US history. Justice John Paul Stevens retired exactly one year later and Obama replaced him with Elena Kagan. Justice Antonin Scalia died on February 13, 2016. President Obama nominated Merrick Garland as his replacement, but the United States Senate, led by Republican Majority Leader Mitch McConnell refused to give Garland a hearing, instead arguing that the winner of the ongoing presidential election be given the opportunity to nominate Scalia's replacement instead. Justice Ruth Bader Ginsburg was pressured by liberal groups to retire while the Democrats remained in control of the White House, but declined to do so. On September 25, 2015, John Boehner announced that he would step down as Speaker and resign from Congress at the end of October 2015. Boehner's resignation took place after Pope Francis' address to Congress the day before, an event considered by Boehner as a high point in his legislative career. Boehner was replaced by Republican Paul Ryan, the U.S. representative for Wisconsin's 1st congressional district and former candidate for vice president along with Mitt Romney. Sources in Boehner's office indicated he was stepping aside in the face of increasing discord while trying to manage passage of a continuing resolution to fund the government. Conservative opposition to funding Planned Parenthood as part of the resolution, and stronger threats to Boehner's leadership on account of the controversy, prompted the abrupt announcement. Members of the caucus indicated that the resignation opened the way for a "clean bill" for government funding to pass, and "a commitment [was] made that there [would] be no shutdown." Social change Some Americans saw the presidential candidacy of Barack Obama, and his election in 2008 as the first black president of the United States, as a sign that the nation had, in fact, become post-racial. The conservative radio host Lou Dobbs, for example, said in November 2009, "We are now in a 21st-century post-partisan, post-racial society." Two months later, Chris Matthews, an MSNBC host, said of President Obama, "He is post-racial by all appearances. You know, I forgot he was black tonight for an hour." However, public opinion on whether the United States is post-racial is itself divided starkly by race. In a Washington Post/ABC News poll conducted in December 2014, about 50% of white respondents said they believed that the justice system treats Americans of all races equally, but only 10% of African Americans said the same. In the spring of 2015, according to a Gallup poll, 13 percent of black Americans surveyed identified race relations as the most important problem the United States faces, compared with 4 percent of white Americans. Arguments that the United States is not post-racial frequently emphasize the treatment of African Americans and other racial minorities in the criminal justice system and in interactions with the police. Killings of unarmed African Americans, often by police officers, have been widely publicized. In 2015, according to a study by The Guardian, police officers in the United States killed 7.13 black Americans per million, compared with 2.91 white Americans per million. Additionally: Young black men were nine times more likely than other Americans to be killed by police officers in 2015, according to the findings of a Guardian study that recorded a final tally of 1,134 deaths at the hands of law enforcement officers this year. Despite making up only 2% of the total US population, African-American males between the ages of 15 and 34 comprised more than 15% of all deaths logged this year by an ongoing investigation into the use of deadly force by police. Their rate of police-involved deaths was five times higher than for white men of the same age. Such killings had a marked effect on public perceptions of race relations in America. The 13 percent of black Americans who called race relations the most pressing problem in the United States in the spring 2015 Gallup poll dwarfed the 3 percent that Gallup reported at the beginning of 2014. And the percentage of white Americans who said race relations were the most important issue rose to 4 percent in 2015 from 1 percent in 2014. In response to high-profile incidents such as the fatal shootings of Michael Brown, Aiyana Jones, Trayvon Martin, Laquan McDonald, Tamir Rice, and Walter Scott, and the death of Freddie Gray from a spinal-cord injury sustained in police custody, academics and journalists have denounced claims that America is post-racial. Ta-Nehisi Coates wrote in The Atlantic in 2015 that the phrase "post-racial" was "usually employed by talk-show hosts and news anchors looking to measure progress in the Obama era." And Anna Holmes wrote in The New York Times, "Chattel slavery and the legacies it left behind continue to shape American society. Sometimes it seems as if the desire for a 'post-racial' America is an attempt by white people to liberate themselves from the burden of having to deal with that legacy." The divide in public opinion on the status of race in America was reflected in reactions to the Black Lives Matter movement. In response to the "black lives matter" rallying cry, some people, including politicians, began using the phrase "all lives matter". In August 2015, after a sheriff's deputy in Harris County, Texas, was fatally shot while pumping gas, Sheriff Ron Hickman claimed that the rhetoric of Black Lives Matter activists had contributed to the killing and said, "We’ve heard 'black lives matter'. All lives matter. Well, cops’ lives matter, too. So why don't we just drop the qualifier and just say 'lives matter', and take that to the bank.' Supporters of the Black Lives Matter movement criticized the "all lives matter" phrase, arguing that it minimized the systemic threats faced by African Americans. President Obama said in October, "There is a specific problem that is happening in the African-American community that's not happening in other communities." Andrew Rosenthal wrote, similarly, in The New York Times, "The point of 'Black Lives Matter' is that the lives of African-Americans have come under special and deadly threat since before the birth of this country." Evidence of continued racial divisions in the United States can also be found in demographics. For instance, African Americans account for less than 15 percent of the total population of Michigan, but more than 82 percent of the population of the state's largest city, Detroit — and Detroit, like many cities whose residents are predominantly black, has "self-segregated schools, dwindling tax bases and decaying public services". Even after the end of the crack epidemic, there remained a large disparity in crime rates between black people and whites, with black people accounting for 28% of arrests in 2013; over 50% of homicides and robberies where the race of the offender was known were committed by black suspects. As most crime is intraracial, most of their victims were black as well, and crime remained concentrated within black communities. Due to high crime rates, many inner city areas were heavily policed, often by police forces drawn from the population of the greater urban area rather than the local, primarily black, population, resulting in many black people feeling that they were being discriminated against by law enforcement. By 2009, black people accounted for 39.4% of the prison population in the United States. The incarceration rate of black males was over six times higher than that of white males, with a rate of 4,749 per 100,000 US residents. In August 2014, Darren Wilson, a white policeman in Ferguson, Missouri shot and killed Michael Brown, an 18-year-old unarmed black man who had robbed a nearby convenience store fifteen minutes earlier. While a grand jury investigation found that Wilson had acted in self-defense after Brown attacked him on two separate occasions, locals hostile to the police claimed that Brown had been gunned down while surrendering. Racial tensions in Ferguson between the mainly black population and mainly white police force led to both peaceful protests and riots, and several buildings were looted and set on fire. In response, the Ferguson Police Department deployed military-grade riot gear and riot control weaponry to disperse crowds and maintain order. Further protests erupted after the death of Eric Garner, a 43-year-old black resident of Staten Island, New York who died after being put in a nineteen-second long chokehold by New York City Police Department officer Daniel Pantaleo while resisting arrest. Garner was being investigated by the NYPD under suspicion of illegally selling cigarettes. Pantaleo's acquittal by a grand jury in December led to nationwide protests by a movement which came to call itself Black Lives Matter. See also Notes References External links |
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Contents Social network 1800s: Martineau · Tocqueville · Marx · Spencer · Le Bon · Ward · Pareto · Tönnies · Veblen · Simmel · Durkheim · Addams · Mead · Weber · Du Bois · Mannheim · Elias A social network is a social structure consisting of a set of social actors (such as individuals or organizations), networks of dyadic ties, and other social interactions between actors. The social network perspective provides a set of methods for analyzing the structure of whole social entities along with a variety of theories explaining the patterns observed in these structures. The study of these structures uses social network analysis to identify local and global patterns, locate influential entities, and examine dynamics of networks. For instance, social network analysis has been used in studying the spread of misinformation on social media platforms or analyzing the influence of key figures in social networks. Social networks and the analysis of them is an inherently interdisciplinary academic field which emerged from social psychology, sociology, statistics, and graph theory. Georg Simmel authored early structural theories in sociology emphasizing the dynamics of triads and "web of group affiliations". Jacob Moreno is credited with developing the first sociograms in the 1930s to study interpersonal relationships. These approaches were mathematically formalized in the 1950s and theories and methods of social networks became pervasive in the social and behavioral sciences by the 1980s. Social network analysis is now one of the major paradigms in contemporary sociology, and is also employed in a number of other social and formal sciences. Together with other complex networks, it forms part of the nascent field of network science. Overview The social network is a theoretical construct useful in the social sciences to study relationships between individuals, groups, organizations, or even entire societies (social units, see differentiation). The term is used to describe a social structure determined by such interactions. The ties through which any given social unit connects represent the convergence of the various social contacts of that unit. This theoretical approach is, necessarily, relational. An axiom of the social network approach to understanding social interaction is that social phenomena should be primarily conceived and investigated through the properties of relations between and within units, instead of the properties of these units themselves. Thus, one common criticism of social network theory is that individual agency is often ignored although this may not be the case in practice (see agent-based modeling). Precisely because many different types of relations, singular or in combination, form these network configurations, network analytics are useful to a broad range of research enterprises. In social science, these fields of study include, but are not limited to anthropology, biology, communication studies, economics, geography, information science, organizational studies, social psychology, sociology, and sociolinguistics. History In the late 1890s, both Émile Durkheim and Ferdinand Tönnies foreshadowed the idea of social networks in their theories and research of social groups. Tönnies argued that social groups can exist as personal and direct social ties that either link individuals who share values and belief (Gemeinschaft, German, commonly translated as "community") or impersonal, formal, and instrumental social links (Gesellschaft, German, commonly translated as "society"). Durkheim gave a non-individualistic explanation of social facts, arguing that social phenomena arise when interacting individuals constitute a reality that can no longer be accounted for in terms of the properties of individual actors. Georg Simmel, writing at the turn of the twentieth century, pointed to the nature of networks and the effect of network size on interaction and examined the likelihood of interaction in loosely knit networks rather than groups. Major developments in the field can be seen in the 1930s by several groups in psychology, anthropology, and mathematics working independently. In psychology, in the 1930s, Jacob L. Moreno began systematic recording and analysis of social interaction in small groups, especially classrooms and work groups (see sociometry). In anthropology, the foundation for social network theory is the theoretical and ethnographic work of Bronislaw Malinowski, Alfred Radcliffe-Brown, and Claude Lévi-Strauss. A group of social anthropologists associated with Max Gluckman and the Manchester School, including John A. Barnes, J. Clyde Mitchell and Elizabeth Bott Spillius, often are credited with performing some of the first fieldwork from which network analyses were performed, investigating community networks in southern Africa, India and the United Kingdom. Concomitantly, British anthropologist S. F. Nadel codified a theory of social structure that was influential in later network analysis. In sociology, the early (1930s) work of Talcott Parsons set the stage for taking a relational approach to understanding social structure. Later, drawing upon Parsons' theory, the work of sociologist Peter Blau provides a strong impetus for analyzing the relational ties of social units with his work on social exchange theory. By the 1970s, a growing number of scholars worked to combine the different tracks and traditions. One group consisted of sociologist Harrison White and his students at the Harvard University Department of Social Relations. Also independently active in the Harvard Social Relations department at the time were Charles Tilly, who focused on networks in political and community sociology and social movements, and Stanley Milgram, who developed the "six degrees of separation" thesis. Mark Granovetter and Barry Wellman are among the former students of White who elaborated and championed the analysis of social networks. Beginning in the late 1990s, social network analysis experienced work by sociologists, political scientists, and physicists such as Duncan J. Watts, Albert-László Barabási, Peter Bearman, Nicholas A. Christakis, James H. Fowler, and others, developing and applying new models and methods to emerging data available about online social networks, as well as "digital traces" regarding face-to-face networks. Levels of analysis In general, social networks are self-organizing, emergent, and complex, such that a globally coherent pattern appears from the local interaction of the elements that make up the system. These patterns become more apparent as network size increases. However, a global network analysis of, for example, all interpersonal relationships in the world is not feasible and is likely to contain so much information as to be uninformative. Practical limitations of computing power, ethics and participant recruitment and payment also limit the scope of a social network analysis. The nuances of a local system may be lost in a large network analysis, hence the quality of information may be more important than its scale for understanding network properties. Thus, social networks are analyzed at the scale relevant to the researcher's theoretical question. Although levels of analysis are not necessarily mutually exclusive, there are three general levels into which networks may fall: micro-level, meso-level, and macro-level. At the micro-level, social network research typically begins with an individual, snowballing as social relationships are traced, or may begin with a small group of individuals in a particular social context. Dyadic level: A dyad is a social relationship between two individuals. Network research on dyads may concentrate on structure of the relationship (e.g. multiplexity, strength), social equality, and tendencies toward reciprocity/mutuality. Triadic level: Add one individual to a dyad, and you have a triad. Research at this level may concentrate on factors such as balance and transitivity, as well as social equality and tendencies toward reciprocity/mutuality. In the balance theory of Fritz Heider the triad is the key to social dynamics. The discord in a rivalrous love triangle is an example of an unbalanced triad, likely to change to a balanced triad by a change in one of the relations. The dynamics of social friendships in society has been modeled by balancing triads. The study is carried forward with the theory of signed graphs. Actor level: The smallest unit of analysis in a social network is an individual in their social setting, i.e., an "actor" or "ego." Egonetwork analysis focuses on network characteristics, such as size, relationship strength, density, centrality, prestige and roles such as isolates, liaisons, and bridges. Such analyses, are most commonly used in the fields of psychology or social psychology, ethnographic kinship analysis or other genealogical studies of relationships between individuals. Subset level: Subset levels of network research problems begin at the micro-level, but may cross over into the meso-level of analysis. Subset level research may focus on distance and reachability, cliques, cohesive subgroups, or other group actions or behavior. In general, meso-level theories begin with a population size that falls between the micro- and macro-levels. However, meso-level may also refer to analyses that are specifically designed to reveal connections between micro- and macro-levels. Meso-level networks are low density and may exhibit causal processes distinct from interpersonal micro-level networks. Organizations: Formal organizations are social groups that distribute tasks for a collective goal. Network research on organizations may focus on either intra-organizational or inter-organizational ties in terms of formal or informal relationships. Intra-organizational networks themselves often contain multiple levels of analysis, especially in larger organizations with multiple branches, franchises or semi-autonomous departments. In these cases, research is often conducted at a work group level and organization level, focusing on the interplay between the two structures. Experiments with networked groups online have documented ways to optimize group-level coordination through diverse interventions, including the addition of autonomous agents to the groups. Randomly distributed networks: Exponential random graph models of social networks became state-of-the-art methods of social network analysis in the 1980s. This framework has the capacity to represent social-structural effects commonly observed in many human social networks, including general degree-based structural effects commonly observed in many human social networks as well as reciprocity and transitivity, and at the node-level, homophily and attribute-based activity and popularity effects, as derived from explicit hypotheses about dependencies among network ties. Parameters are given in terms of the prevalence of small subgraph configurations in the network and can be interpreted as describing the combinations of local social processes from which a given network emerges. These probability models for networks on a given set of actors allow generalization beyond the restrictive dyadic independence assumption of micro-networks, allowing models to be built from theoretical structural foundations of social behavior. Scale-free networks: A scale-free network is a network whose degree distribution follows a power law, at least asymptotically. In network theory a scale-free ideal network is a random network with a degree distribution that unravels the size distribution of social groups. Specific characteristics of scale-free networks vary with the theories and analytical tools used to create them, however, in general, scale-free networks have some common characteristics. One notable characteristic in a scale-free network is the relative commonness of vertices with a degree that greatly exceeds the average. The highest-degree nodes are often called "hubs", and may serve specific purposes in their networks, although this depends greatly on the social context. Another general characteristic of scale-free networks is the clustering coefficient distribution, which decreases as the node degree increases. This distribution also follows a power law. The Barabási model of network evolution shown above is an example of a scale-free network. Rather than tracing interpersonal interactions, macro-level analyses generally trace the outcomes of interactions, such as economic or other resource transfer interactions over a large population. Large-scale networks: Large-scale network is a term somewhat synonymous with "macro-level." It is primarily used in social and behavioral sciences, and in economics. Originally, the term was used extensively in the computer sciences (see large-scale network mapping). Complex networks: Most larger social networks display features of social complexity, which involves substantial non-trivial features of network topology, with patterns of complex connections between elements that are neither purely regular nor purely random (see, complexity science, dynamical system and chaos theory), as do biological, and technological networks. Such complex network features include a heavy tail in the degree distribution, a high clustering coefficient, assortativity or disassortativity among vertices, community structure (see stochastic block model), and hierarchical structure. In the case of agency-directed networks these features also include reciprocity, triad significance profile (TSP, see network motif), and other features. In contrast, many of the mathematical models of networks that have been studied in the past, such as lattices and random graphs, do not show these features. Theoretical links Various theoretical frameworks have been imported for the use of social network analysis. The most prominent of these are Graph theory, Balance theory, Social comparison theory, and more recently, the Social identity approach. Few complete theories have been produced from social network analysis. Two that have are structural role theory and heterophily theory. The basis of Heterophily Theory was the finding in one study that more numerous weak ties can be important in seeking information and innovation, as cliques have a tendency to have more homogeneous opinions as well as share many common traits. This homophilic tendency was the reason for the members of the cliques to be attracted together in the first place. However, being similar, each member of the clique would also know more or less what the other members knew. To find new information or insights, members of the clique will have to look beyond the clique to its other friends and acquaintances. This is what Granovetter called "the strength of weak ties". Structural holes In the context of networks, social capital exists where people have an advantage because of their location in a network. Contacts in a network provide information, opportunities and perspectives that can be beneficial to the central player in the network. Most social structures tend to be characterized by dense clusters of strong connections. Information within these clusters tends to be rather homogeneous and redundant. Non-redundant information is most often obtained through contacts in different clusters. When two separate clusters possess non-redundant information, there is said to be a structural hole between them. Thus, a network that bridges structural holes will provide network benefits that are in some degree additive, rather than overlapping. An ideal network structure has a vine and cluster structure, providing access to many different clusters and structural holes. Networks rich in structural holes are a form of social capital in that they offer information benefits. The main player in a network that bridges structural holes is able to access information from diverse sources and clusters. For example, in business networks, this is beneficial to an individual's career because he is more likely to hear of job openings and opportunities if his network spans a wide range of contacts in different industries/sectors. This concept is similar to Mark Granovetter's theory of weak ties, which rests on the basis that having a broad range of contacts is most effective for job attainment. Structural holes have been widely applied in social network analysis, resulting in applications in a wide range of practical scenarios as well as machine learning-based social prediction. Research clusters Research has used network analysis to examine networks created when artists are exhibited together in museum exhibition. Such networks have been shown to affect an artist's recognition in history and historical narratives, even when controlling for individual accomplishments of the artist. Other work examines how network grouping of artists can affect an individual artist's auction performance. An artist's status has been shown to increase when associated with higher status networks, though this association has diminishing returns over an artist's career. In J.A. Barnes' day, a "community" referred to a specific geographic location and studies of community ties had to do with who talked, associated, traded, and attended church with whom. Today, however, there are extended "online" communities developed through telecommunications devices and social network services. Such devices and services require extensive and ongoing maintenance and analysis, often using network science methods. Community development studies, today, also make extensive use of such methods. Complex networks require methods specific to modelling and interpreting social complexity and complex adaptive systems, including techniques of dynamic network analysis. Mechanisms such as Dual-phase evolution explain how temporal changes in connectivity contribute to the formation of structure in social networks. The study of social networks is being used to examine the nature of interdependencies between actors and the ways in which these are related to outcomes of conflict and cooperation. Areas of study include cooperative behavior among participants in collective actions such as protests; promotion of peaceful behavior, social norms, and public goods within communities through networks of informal governance; the role of social networks in both intrastate conflict and interstate conflict; and social networking among politicians, constituents, and bureaucrats. In criminology and urban sociology, much attention has been paid to the social networks among criminal actors. For example, murders can be seen as a series of exchanges between gangs. Murders can be seen to diffuse outwards from a single source, because weaker gangs cannot afford to kill members of stronger gangs in retaliation, but must commit other violent acts to maintain their reputation for strength. Diffusion of ideas and innovations studies focus on the spread and use of ideas from one actor to another or one culture and another. This line of research seeks to explain why some become "early adopters" of ideas and innovations, and links social network structure with facilitating or impeding the spread of an innovation. A case in point is the social diffusion of linguistic innovation such as neologisms. Experiments and large-scale field trials (e.g., by Nicholas Christakis and collaborators) have shown that cascades of desirable behaviors can be induced in social groups, in settings as diverse as Honduras villages, Indian slums, or in the lab. Still other experiments have documented the experimental induction of social contagion of voting behavior, emotions, risk perception, and commercial products. In demography, the study of social networks has led to new sampling methods for estimating and reaching populations that are hard to enumerate (for example, homeless people or intravenous drug users.) For example, respondent driven sampling is a network-based sampling technique that relies on respondents to a survey recommending further respondents. The field of sociology focuses almost entirely on networks of outcomes of social interactions. More narrowly, economic sociology considers behavioral interactions of individuals and groups through social capital and social "markets". Sociologists, such as Mark Granovetter, have developed core principles about the interactions of social structure, information, ability to punish or reward, and trust that frequently recur in their analyses of political, economic and other institutions. Granovetter examines how social structures and social networks can affect economic outcomes like hiring, price, productivity and innovation and describes sociologists' contributions to analyzing the impact of social structure and networks on the economy. Analysis of social networks is increasingly incorporated into health care analytics, not only in epidemiological studies but also in models of patient communication and education, disease prevention, mental health diagnosis and treatment, and in the study of health care organizations and systems. Human ecology is an interdisciplinary and transdisciplinary study of the relationship between humans and their natural, social, and built environments. The scientific philosophy of human ecology has a diffuse history with connections to geography, sociology, psychology, anthropology, zoology, and natural ecology. In the study of literary systems, network analysis has been applied by Anheier, Gerhards and Romo, De Nooy, Senekal, and Lotker, to study various aspects of how literature functions. The basic premise is that polysystem theory, which has been around since the writings of Even-Zohar, can be integrated with network theory and the relationships between different actors in the literary network, e.g. writers, critics, publishers, literary histories, etc., can be mapped using visualization from SNA. Research studies of formal or informal organization relationships, organizational communication, economics, economic sociology, and other resource transfers. Social networks have also been used to examine how organizations interact with each other, characterizing the many informal connections that link executives together, as well as associations and connections between individual employees at different organizations. Many organizational social network studies focus on teams. Within team network studies, research assesses, for example, the predictors and outcomes of centrality and power, density and centralization of team instrumental and expressive ties, and the role of between-team networks. Intra-organizational networks have been found to affect organizational commitment, organizational identification, interpersonal citizenship behaviour. Social capital is a form of economic and cultural capital in which social networks are central, transactions are marked by reciprocity, trust, and cooperation, and market agents produce goods and services not mainly for themselves, but for a common good. Social capital is split into three dimensions: the structural, the relational and the cognitive dimension. The structural dimension describes how partners interact with each other and which specific partners meet in a social network. Also, the structural dimension of social capital indicates the level of ties among organizations. This dimension is highly connected to the relational dimension which refers to trustworthiness, norms, expectations and identifications of the bonds between partners. The relational dimension explains the nature of these ties which is mainly illustrated by the level of trust accorded to the network of organizations. The cognitive dimension analyses the extent to which organizations share common goals and objectives as a result of their ties and interactions. Social capital is a sociological concept about the value of social relations and the role of cooperation and confidence to achieve positive outcomes. The term refers to the value one can get from their social ties. For example, newly arrived immigrants can make use of their social ties to established migrants to acquire jobs they may otherwise have trouble getting (e.g., because of unfamiliarity with the local language). A positive relationship exists between social capital and the intensity of social network use. In a dynamic framework, higher activity in a network feeds into higher social capital which itself encourages more activity. This particular cluster focuses on brand-image and promotional strategy effectiveness, taking into account the impact of customer participation on sales and brand-image. This is gauged through techniques such as sentiment analysis which rely on mathematical areas of study such as data mining and analytics. This area of research produces vast numbers of commercial applications as the main goal of any study is to understand consumer behaviour and drive sales. In many organizations, members tend to focus their activities inside their own groups, which stifles creativity and restricts opportunities. A player whose network bridges structural holes has an advantage in detecting and developing rewarding opportunities. Such a player can mobilize social capital by acting as a "broker" of information between two clusters that otherwise would not have been in contact, thus providing access to new ideas, opinions and opportunities. British philosopher and political economist John Stuart Mill, writes, "it is hardly possible to overrate the value of placing human beings in contact with persons dissimilar to themselves.... Such communication [is] one of the primary sources of progress." Thus, a player with a network rich in structural holes can add value to an organization through new ideas and opportunities. This in turn, helps an individual's career development and advancement. A social capital broker also reaps control benefits of being the facilitator of information flow between contacts. Full communication with exploratory mindsets and information exchange generated by dynamically alternating positions in a social network promotes creative and deep thinking. In the case of consulting firm Eden McCallum, the founders were able to advance their careers by bridging their connections with former big three consulting firm consultants and mid-size industry firms. By bridging structural holes and mobilizing social capital, players can advance their careers by executing new opportunities between contacts. There has been research that both substantiates and refutes the benefits of information brokerage. A study of high tech Chinese firms by Zhixing Xiao found that the control benefits of structural holes are "dissonant to the dominant firm-wide spirit of cooperation and the information benefits cannot materialize due to the communal sharing values" of such organizations. However, this study only analyzed Chinese firms, which tend to have strong communal sharing values. Information and control benefits of structural holes are still valuable in firms that are not quite as inclusive and cooperative on the firm-wide level. In 2004, Ronald Burt studied 673 managers who ran the supply chain for one of America's largest electronics companies. He found that managers who often discussed issues with other groups were better paid, received more positive job evaluations and were more likely to be promoted. Thus, bridging structural holes can be beneficial to an organization, and in turn, to an individual's career. Computer networks combined with social networking software produce a new medium for social interaction. A relationship over a computerized social networking service can be characterized by context, direction, and strength. The content of a relation refers to the resource that is exchanged. In a computer-mediated communication context, social pairs exchange different kinds of information, including sending a data file or a computer program as well as providing emotional support or arranging a meeting. With the rise of electronic commerce, information exchanged may also correspond to exchanges of money, goods or services in the "real" world. Social network analysis methods have become essential to examining these types of computer mediated communication. In addition, the sheer size and the volatile nature of social media has given rise to new network metrics. A key concern with networks extracted from social media is the lack of robustness of network metrics given missing data. Based on the pattern of homophily, ties between people are most likely to occur between nodes that are most similar to each other, or within neighbourhood segregation, individuals are most likely to inhabit the same regional areas as other individuals who are like them. Therefore, social networks can be used as a tool to measure the degree of segregation or homophily within a social network. Social Networks can both be used to simulate the process of homophily but it can also serve as a measure of level of exposure of different groups to each other within a current social network of individuals in a certain area. See also References Further reading External links |
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Contents Truth Social Truth Social is an American alt-tech social media platform owned by Trump Media & Technology Group (TMTG), an American company majority-owned by US president Donald Trump. It has been called a "Twitter clone" that competes with Parler, Gab, and Mastodon in trying to provide an alternative to Twitter and Facebook. The service was launched in February 2022, created in response to Trump's bans from major social networks after the January 6 Capitol attack. It is a self-styled "free-speech" alternative to mainstream platforms, catering primarily to a conservative and pro-Trump user base. Since mid-2022, it has faced financial and regulatory issues. It was unavailable on Google Play because of policies prohibiting content with physical threats and incitement to violence, but approved in October 2022 after agreeing to enforce policies against incitement. As of March 2024[update], it was ranked number 38 in Apple's App Store rankings for social media apps.[failed verification] In 2022, Similarweb ranked it 133 in the U.S. in their "News & Media Publishers" category, ahead of Gab at 720 and Parler at 5,117. Digital World Acquisition Corp. (DWAC), the special-purpose acquisition company formed to fund Truth Social's parent company TMTG and take it public, disclosed in 2023 that it was refunding investors the $1 billion it had raised for TMTG. A 2023 financial disclosure by DWAC indicated Truth Social had made a cumulative loss of at least $31 million since its inception. In 2024, DWAC shareholders voted to merge with TMTG, with the merged company trading on Nasdaq. In May 2024, TMTG's regulatory filing for the first quarter of 2024 reported $328 million in losses, resulting from taking the company public, and $770,000 in revenue. Estimates in early 2025 suggested 6.3 million monthly active users—small compared with major rivals. Truth Social has faced multiple regulatory and legal investigations, including scrutiny from the SEC and DOJ over financial disclosures and accounting practices. The platform has drawn criticism for content moderation inconsistencies, misinformation, and its role in Trump’s political and media ecosystem. History U.S. President Donald Trump raised the prospect of building a new social media platform after he was banned from Facebook and Twitter in 2021, following the 2021 United States Capitol attack In May 2021, Trump launched "From the Desk of Donald J. Trump", a web page where he posted short tweet-like announcements; it was shut down after less than a month, with Trump's senior aide Jason Miller confirming it would not be coming back. According to Reuters, two members of the cast of Trump's TV show The Apprentice, Wes Moss and Andy Litinsky, were "central" to the founding of Truth Social's parent company, the Trump Media & Technology Group (TMTG), having allegedly pitched the idea of a social network to Trump in January 2021. To facilitate becoming a publicly traded company, a special-purpose acquisition company (SPAC) called Digital World Acquisition Corp (DWAC) was created with the help of ARC Capital, a Shanghai-based firm specializing in listing Chinese companies on American stock markets that has been a target of SEC investigations for misrepresenting shell corporations. ARC also provided at least $2 million to get DWAC off the ground through a Singapore-based fund. Led by China-based banker Abraham Cinta, ARC Capital's global links included offices in Shanghai, Wuhan, Mexico City, and Jakarta, which Bloomberg News described as "surprising", due to Trump's comments on various foreign countries in office. Some investors were surprised to learn their investment money was being used to finance a Trump company. The DWAC chief executive Patrick Orlando, a Florida-based financier and former Deutsche Bank trader, was also the chief executive of the Wuhan-based Yunhong Holdings/Yunhong International, registered in the offshore tax haven of the Cayman Islands. In an October 2021 SEC filing, the special-purpose acquisition company Yunhong International stated its goal was to "capitalize on growing opportunities created by consumer/lifestyle businesses that have their primary operations in Asia." Reuters quoted a deleted presentation from 2020, in which ARC Capital said it "was able to craft a Wuhan-based SPAC sponsored by a family office, structured by ARC in Singapore, to allow our client to enjoy the flexibility and benefits of the U.S. financial markets." Yunhong was liquidated in December 2021, while its backers remained involved with the DWAC and Truth Social venture. An additional backer of the Trump social media venture, becoming the CFO of Digital World Acquisition, was Brazilian parliamentarian Luiz Philippe of Orléans-Braganza, a monarchist allied with Jair Bolsonaro. In October 2021, TMTG published a document outlining the Truth Social platform, citing a poll saying one-third of the U.S. population polled had stated they would use a social media platform endorsed by Trump. On October 20, TMTG issued a press release announcing the platform would have its public launch in "the first quarter of 2022." It was slated to enter limited beta for Apple iOS in November 2021, and though it did not meet this schedule for its beta testing, Trump claimed in December 2021 "invited guests" were already using the beta system. Hours after the press release, a person identifying themselves as a part of the hacker collective Anonymous used Shodan to discover domains related to the company, eventually locating what appeared to be a publicly-accessible mobile beta of the service. The URL, which permitted users to sign up and use the platform, was leaked across social media. Users began trolling, creating parody accounts, and posting rants and memes. Users were able to sign up with usernames of high-profile individuals including Trump, Mike Pence, and Jack Dorsey. The link was later taken offline. According to The Guardian, in December 2021, two loans totaling $8 million (~$9.11 million in 2024) were paid to Trump Media from obscure Putin-connected entities as the company was "on the brink of collapse". $2 million was paid by Paxum Bank, part-owned by Anton Postolnikov, a relation of Aleksandr Smirnov, a former Russian government official who now runs the Russian maritime company Rosmorport. $6 million was paid by an ostensibly separate entity, ES Family Trust, whose director was the director of Paxum Bank at the same time. As of March 2023, prosecutors in the US Attorney for the Southern District of New York were investigating the Russian ties. The Washington Post reported that Trump Media paid a $240,000 finder's fee as part of the arrangement, allegedly to a party associated with Digital World. The federal probe into investors of DWAC, according to The Washington Post, discovered that a wealthy investor in the company was allegedly connected to attempts to allegedly move assets from Russia, Ukraine, and China into the Caribbean, and other intermediaries such as Hong Kong, United Kingdom, and Belize. According to a government transcript, an informant referenced the process as "the full Singapore with a double dip, as we call it, with having the U.K. thrown in there, just to give it that added cleanliness and polishing off." The New York Times described Truth Social as an addition to the field of already-existing alt-tech platforms. BBC journalist James Clayton stated the platform could be a more successful version of other alt-tech social media platforms like Parler and Gab and is an attempt by Trump to gain his "megaphone" back. Gettr CEO Jason Miller, a former Trump advisor, praised Truth Social and said the platform will cause Facebook and Twitter to "lose even more market share". Gab said in a statement it supports Truth Social and users of Gab can follow Trump on his reserved Gab account. Among critical reactions, Chris Cillizza of CNN wrote that the platform was doomed to fail. Noah Berlatsky, writing for The Independent, described it as a "potential threat to democracy". The Forward raised concerns of antisemitism becoming prominent on the platform, noting similar platforms have become known for hosting antisemitic content, such as Parler, Gab, and Telegram. Rolling Stone observed that while Truth Social promises to be an open and free platform, Truth Social's terms of service include a clause stating users cannot disparage the service. The New York Times expressed skepticism about whether Truth Social would be able to compete effectively against rival services. Platform Truth Social is run by Trump Media & Technology Group, and headed by former California GOP Congressman Devin Nunes. In 2022, Talking Points Memo stated Nunes' remuneration was $750,000 per year. Other senior employees included chief of technology Josh Adams and chief of product development Billy Boozer, who both subsequently left the company. The company's headquarters are in Sarasota, Florida. It was reported to have about 40 employees in March 2022. In October 2024, ProPublica reported that a whistleblower sent a letter alerting the board that the company had outsourced programming work to Mexico, citing concerns about the quality of the work and the split from 'America first' principles. Truth Social is modeled heavily after Twitter; users are able to make posts ("Truths", similar to tweets) and share other users' posts ("ReTruths", similar to retweets). The Truth Social platform uses a custom version of the free and open-source social network hosting software Mastodon as its back end, which omits several Mastodon features, including polls and post visibility options. The platform uses Soapbox Technology's "Soapbox" front end instead of Mastodon's native front end. TMTG has advertised for developers with skills in using Elixir, the programming language used to build Pleroma, a social networking software compatible with Mastodon. On October 21, 2021, the Software Freedom Conservancy group stated they suspected Truth Social had violated Mastodon's AGPLv3 license by not offering its source code to all users. The Mastodon developers then formally requested that Truth Social comply with the terms of the software license, with Truth Social publishing its source code as a ZIP file on the website on November 12, 2021. On February 22, 2022, the source code download was moved to the website's legal section. A mirror of the source code is available at GitHub, where it was uploaded by uninvolved individuals. The service is designed for access by web browsing and as an app for both Android and Apple devices: The Truth Social service was originally hosted on RightForge, a company aimed at providing internet hosting for conservative causes that describes itself as "The first global Internet infrastructure company committed to American principles online". In December 2021, TMTG said it had partnered with the Canadian online video platform Rumble, which was already providing cloud services to the Truth Social beta service. In April 2022, TMTG announced Truth Social would be moving to Rumble's cloud platform and announced they would be performing infrastructure upgrades to increase the platform's performance. TMTG engaged the services of Hive, a content moderation company that uses machine learning to filter postings for unacceptable content. As of June 2022[update], Truth Social uses Cloudflare as its CDN for both mobile and web traffic. Reuters reported Fastly had refused to take Truth Social on as a customer. In July 2024, TMTG said it was purchasing streaming technology for Truth Social. Louisiana energy magnate James E. Davison is involved in the purchase under the business name JedTec LLC. In 2019, through his connections at the Trump White House, he received a $17 million federal grant to build roads. In August, the company announced plans for Truth+, a streaming service, without a specified launch date. It is intended to be integrated into Truth Social's website and apps. Truth Social was launched proclaiming itself as a "big tent" platform without political censorship, allowing for "free expression" without "discriminating on the basis of political ideology". When the company was first announced in October 2021, its terms of service said the company would not be legally responsible for "the content, accuracy, offensiveness, opinions [or] reliability" of anything users might post to the service. Some commentators noted that this self-declared immunity appeared to rely on Section 230 of the Communications Decency Act, a law Trump firmly opposed during his presidency. The original terms of service further added that users would be forbidden to "disparage, tarnish, or otherwise harm, in our opinion, us and/or the Site". Truth Social said it had the right to "suspend or terminate your account" and "take appropriate legal action". The anti-disparagement section of the terms of service was removed in late 2022. Sexual content remains forbidden by the terms of service. Truth Social has blocked accounts for behavior it considers harmful or inappropriate, including accounts with parody names and death threats. The platform has been widely accused of censorship. In June 2022, several accounts were banned after posting about investigations into the 2021 United States Capitol attack and the publicly televised January 6 hearings that detailed events leading up to the mob violence on that day, in which Trump supporters breached the United States Congress, seeking to overturn the 2020 presidential election. According to an August 2022 report from progressive consumer rights advocacy group Public Citizen, Truth Social was found to shadowban liberal and progressive users that disagree with the site's narrative, as well as a swathe of other content, including some conservative content. Truth Social has banned content mentioning abortion and the January 6 hearings. Public Citizen concluded that Truth Social's content moderation was substantially more limiting than Twitter, and said Truth Social's policies were creating an echo chamber of violent views. Operations Trump made the platform's first post on February 16, 2022. That day, TMTG CEO Devin Nunes said he expected the platform would not completely open to the public until late March. A beta test with 500 users was in operation during February 2022. On February 21, 2022, Truth Social was released on Apple iOS, reaching number one on the App Store's top charts. Due to an extensive backlog of applicants, upon downloading the app, about 500,000 people who initially attempted to register as users were automatically waitlisted. The app was installed 872,000 times during its first week, but a month later, new user signup had fallen to 60,000 per week. During that time, weekly visits to truthsocial.com fell from 6 million to fewer than 2 million. Upon its launch, the British automotive solar power company Trailar complained Truth Social's app logo closely resembled its "T" logo. The platform has been criticized for its poor performance at launch, with waitlisting users attempting to register and extended outages. A day after its launch, The Washington Post described it as "a disaster". A week after, Newsweek reported some early adopters were beginning to lose interest in the app due to low numbers of users and poor engagement, although others were willing to persevere with the app to see if things would improve. The Truth Social platform suffered from severe and persistent problems with scalability at launch, limiting the platform's growth. In early March 2022, multiple sources reported that Truth Social usage remained low, with Trump himself not having posted to his account since his first message two weeks earlier and his account having only 140,000 followers—less than 0.2% of the 90 million followers he had on Twitter before his account was banned. The Daily Dot reported the Truth Social iOS app had fallen from the number one slot for downloads on the Apple App Store to number 84. The Daily Beast reported Trump was dissatisfied with the social network's progress. At the end of March 2022, TheWrap reported that weekly installations of the Truth Social app had fallen from 872,000 in its launch week to around 60,000 per week, a reduction of over 90%. Visits to truthsocial.com had also fallen, from 6 million per week to 1.9 million. According to Sensor Tower, Truth Social had been downloaded 1.2 million times by late March. In early April 2022, Bloomberg News reported that shares in Truth Social's publicly traded holding company Digital World Acquisition Corp. (DWAC) had fallen 31% from the time of the app's launch in late February and 64% from its all-time high. In early April 2022, Business Insider described Truth Social as "like a conservative ghost town that had been overrun by bots". A U.S.-based reporter for the BBC attempted to sign up in early April and was placed on a waitlist with about 1.4 million requests ahead of him. On April 4, it was reported that Josh Adams and Billy Boozer, the platform's chief of technology and chief of product development respectively, had left the company. A report in The Washington Post stated Truth Social was "falling apart", with problems mounting on multiple fronts. A Guardian article compared Truth Social with Trump Steaks and Trump Vodka. As of late April 2022, MarketWatch reported Truth Social had around 513,000 active daily users, compared to Twitter's reported active daily userbase of 217 million. Usership figures were not available, but Trump was reported on August 19, 2022, to have 3.9 million Truth Social followers. He had had 89 million on Twitter and 34 million on Facebook before being banned from both platforms. As of early June 2022, SimilarWeb reported Truth Social's iOS app as ranking No. 49 in the social networking category of apps on the Apple App Store. As of October 2022, the iOS app had sunk to No. 75 in the social networking category. During May 2023, SimilarWeb's ranking of the Truth Social iOS app fluctuated wildly, ranging from #18 to No. 153 in the Apple App Store social networking category during that period. Trump Media has not reported the number of Truth Social users. Data aggregator SimilarWeb estimated their number of visitors per month at 5 million in February 2024 and the number of active users in the U.S. at 1 million per month. On March 25, 2024, the day TMTG's stock began trading publicly, Truth Social had 277,000 U.S. visitors, while Reddit had 32 million. By April 2024, Truth Social's daily average of active users in the U.S. had dropped 19% over the past year to around 113,000. During the same period, the daily average of active U.S. users on Twitter was down 11% to 34 million, on Reddit up 17% to 31.4 million, and on Threads up 5% to 3.5 million. The number of monthly visits from May 2023 to April 2024 was just over 4 million, down 39% compared to the period May 2022 to April 2023. Trump Media says it does not track traditional performance indicators such as daily or monthly visitor numbers, revenue per user, or ad impressions, saying in their FEC filing that they "might not align with the best interests" of the company or its stockholders. During Trump's second term, the daily average of active users had risen to 359,000 in May 2025 but was still far below X's 131.9 million, Threads's 112.9 million, and Reddit's 66.2 million, according to SimilarWeb as reported by CNN. Following Elon Musk's acquisition of Twitter, many commentators observed that a Musk-run Twitter would be likely to reduce demand for Truth Social's services. Musk said that as of late April 2022, Truth Social iOS app downloads exceeded those of Twitter and TikTok on the same platform. He said Truth Social only existed because of Twitter's restrictions on free speech. Describing Truth Social as a "terrible name", Musk joked that it should be renamed "Trumpet". Following Musk's comments on Twitter, the Truth Social app rose in popularity, returning to the number 1 position for free iOS apps on Apple's App Store on April 30, with the Twitter app at number 2; DWAC shares also rose in value. DWAC's share price fell after Musk's announcement of his intention to buy Twitter. Truth Social CEO Devin Nunes later stated that Musk had been encouraged by Trump to buy Twitter; Musk denied this, saying "This is false. I've had no communication, directly or indirectly, with Trump, who has publicly stated that he will be exclusively on Truth Social." Musk subsequently said he intended to reverse Twitter's ban on Trump's Twitter account if his bid for the company was successful. Following Musk's comments, Nunes reiterated that Trump was committed to Truth Social, and would not rejoin Twitter even if his ban were to be lifted. Following Musk's announcement in July that he no longer intended to purchase Twitter, DWAC shares rose. Musk later went through with the deal, purchased Twitter in October 2022 and after a public poll resulted in a majority of people wanting the ban to be lifted, the ban on Donald Trump was lifted in November. Donald Trump would not post to Twitter again for nearly a year, stating he preferred to use Truth Social as his primary platform. As of May 2022[update], Truth Social had not secured any advertising revenue. TMTG stated it "expects to incur significant losses into the foreseeable future". In late August 2022, Fox Business reported that Truth Social's hosting company RightForge claimed it was owed $1.6 million by Truth Social and was threatening to take legal action. In early September 2022, Digital World Acquisition Corp. (DWAC), the SPAC set to acquire TMTG, secured an extension from shareholders for up to six months for it to perform the deal. This left DWAC shares trading at $24, down from a 2021 high of $175. In the same month, Politico writer Jack Shafer wrote about the "slow-cooking financial disaster that has been simmering in Donald Trump's business Crock-Pot". On September 24, Reuters reported investors had withdrawn commitments of almost $140 million, following the expiry of a deadline on September 20. On November 3, DWAC postponed the shareholder vote on the merger deal for a sixth time. In January 2023, the New York Times reported that, while Truth Social now carried advertising, it was limited to niche products, without the participation of major brands. It reported Truth Social's burn rate at around $1.7m per month. In March 2023, The Guardian reported that "Federal prosecutors in New York involved in the criminal investigation into Donald Trump’s social media company last year started examining whether it violated money laundering statutes in connection with the acceptance of $8m with suspected Russian ties". In September 2023, DWAC postponed the merger deadline yet again. In October 2023 DWAC disclosed in a regulatory filing that it would refund to investors the $1 billion it had raised for TMTG, the parent company of Truth Social, triggering speculation that this might lead to Truth Social's eventual demise. A November 2023 DWAC financial disclosure indicated TMTG had generated losses such that management had "substantial doubt" about its ability to pay its bills, and the company's accounting firm had "substantial doubt" about TMTG's ability to remain in business. The Hollywood Reporter reported that Truth Social had made losses to date of between $31.5 million and $60.5 million, depending on the basis of how the accounts were interpreted. A number of news outlets had initially reported higher losses based on the report, leading Truth Social's parent company to file a lawsuit against them, accusing them of defamation. During the 2024 presidential campaign, Trump's personal financial Federal Communications Commission (FCC) disclosure for 2023 listed the site's value range at $5-25 million. On April 1, 2024, TMTG filed a report with the U.S. Securities and Exchange Commission (SEC) that showed the company had lost over $58 million in 2023 and that its only income was $4 million in advertising on Truth Social. Trump Media listed its largest expense for the year as interest payments totaling more than $39 million. In May 2024, TMTG disclosed Truth Social's unaudited financials for the first quarter of 2024, reporting $770,000 in revenue, down from $1.1 million for the same period in 2023, and $327.6 million in losses. According to the filing, $311 million of the losses resulted from "noncash expenses arising from the conversion of promissory notes" when the company went public, and roughly half of the operating losses of $12.1 million were merger-related costs. For the second quarter of 2024, TMTG reported $837,000 in revenue and a loss of $16.4 million. In February 2025, TMTG's filing with the Securities and Exchange Commission reported a net loss of $401 million on $3.6 million in revenue for 2024. The company also reported that CEO Devin Nunes received $47 million in compensation. TMTG's filing for the first quarter of 2025 reported a total revenue of $821,000, up 6.6% from the same period in 2024, and an operating loss of $39.5 million. The loss was partially offset by interest income, resulting in a net loss of $31.7 million. TMTG's filing for the second quarter of 2025 reported a total revenue of $883,300, up 5.5% from the same period in 2024, and an operating loss of $43.5 million. The loss was partially offset by interest and investment income, resulting in a net loss of $20 million, up from $16.4 million in the same period in 2023. TMTG's filing for the third quarter of 2025 reported a total revenue of $972,900, down 3% from the same period in 2024, and a net loss of $54.8 million, up from $19.2 million in the same period in 2024. The company also reported $20.3 million in legal expenses. In June 2022, federal regulators investigated whether TMTG had illegally coordinated with its holding company, Digital World Acquisition Corp, prior to the latter going public. A federal grand jury was empaneled as part of the investigation. TMTG released a statement saying they are cooperating with the investigation. Due to the investigation, Digital World has not merged with TMTG as planned. Digital World asked its shareholders to vote to allow an extra year to complete the merger, but as of September 6, 2022, it appeared they will not vote in favor of the extra time. If the companies do not merge, Truth Social may not receive $1.3 billion from Digital World. Donald Trump was revealed to have left the company's board on June 8, prior to the issuing of subpoenas. World Trademark Review reported that "Truth Social" had been applied for as a trademark in the European Union within a week of the announcement of Trump's company, and registered, potentially preventing the Truth Social service from operating in most of Europe. At the end of August 2022, the U.S. Patent and Trademark Office denied Trump Media & Technology Group's application for a trademark on "Truth Social" as two companies already use the term. A whistleblower submission was made by Will Wilkerson to the Securities and Exchange Commission in August 2022, with original source information of alleged federal securities law violations, detailing fraudulent misrepresentations in violation of federal securities laws. Wilkerson was one of the company's earliest employees; he held the post of senior vice president of operations, and was intimately involved in internal TMTG business strategy discussions. He was dismissed from the company in October 2022. In June 2023, U.S. prosecutors charged three Florida men for insider trading allegedly related to DWAC (Digital World Acquisition Corp) as part of Trump's social media merger deal in 2021. On February 15, 2024, the SEC approved the merger, declaring the registration statement for DWAC's combination with TMTG to be effective after markets closed on Wednesday, February 14, 2024. Share price and value Following the merger of DWAC into TMTG, the merged company was listed on the NASDAQ stock market under the ticker symbol DJT, after Trump's initials. The share price of the company rose rapidly after the merger, reaching a price that gave the company a nominal value of $4.48bn. It fell over the subsequent days, losing 20% on one day alone after the announcement of the company's profit and loss results over the previous year. On 4 September 2024 shares closed below $17, valuing Trump's majority stake in the company at under $2bn on paper. Trump is not permitted to sell his Truth Social shares or use them as collateral until six months after the merger. The stock has been described as a "meme stock", with early price rises driven by speculators and small investors loyal to Trump. Notable activity Although Donald Trump's participation in TMTG and the scale of his social media following was a major part of TMTG's marketing for Truth Social, Trump was initially not a frequent user of the Truth Social platform. He made the platform's first post on February 16, 2022, with the message "Get ready! Your favorite president will see you soon". His next post was made on April 28, posting "I'M BACK! #COVFEFE", a reference to the covfefe meme. Trump then started posting more frequently. Following the announcement of Elon Musk's proposed takeover of Twitter, Trump publicly stated that he does not intend to return to Twitter and intends to remain on Truth Social. On May 6, in a court filing responding to the New York attorney general's demand for his cell phones, Trump said Truth Social had recently given him a phone that he only uses to post on Truth Social. According to reports, Trump has a licensing agreement with TMTG requiring him to use Truth Social as his primary social media platform and to wait at least six hours before reposting material to any other social media platform, with some exceptions for political activities. In early August 2022, Truth Social experienced a significant increase in downloads following the FBI search of Mar-a-Lago. Following the publication of a heavily redacted affidavit regarding the search, Trump reacted angrily to the contents of the document in a series of Truth Social posts, saying "Affidavit heavily redacted!!! [...] Nothing mentioned on 'Nuclear,' a total public relations subterfuge by the FBI & DOJ, or our close working relationship regarding document turnover - WE GAVE THEM MUCH." The commentator Barbara McQuade observed that Trump's Truth Social posts on the matter might potentially undermine Trump's defense against charges arising from the search. Trump followed this days later with a sequence of sixty Truth Social posts. Multiple news sources noted that these posts represented a marked increase in the intensity of his rhetoric, explicitly referencing QAnon and 4chan conspiracy theories. In October 2022, Trump posted a comment criticizing American Jews, telling them to "get their act together and appreciate what they have in Israel" before it's "too late". Three organizations, including the Anti-Defamation League and the Jewish Democratic Council of America, criticized Trump's comment as condescending and as repeating a "dual loyalty" antisemitic trope. Rabbi Yaakov Menken, managing director at the Coalition for Jewish Values, on the contrary, stated that he supported Trump's comments and did not consider them as antisemitic. In November 2022, Trump released a post claiming without evidence that he had "sent in the FBI and the U.S. Attorneys" in 2018 to assist in the Florida gubernatorial election of Ron DeSantis. On 4 December 2022, Trump used his Truth Social account to say alleged election fraud allows for the "termination" of election rules found in the Constitution of the United States, stating: So, with the revelation of MASSIVE & WIDESPREAD FRAUD & DECEPTION in working closely with Big Tech Companies, the DNC, & the Democrat Party, do you throw the Presidential Election Results of 2020 OUT and declare the RIGHTFUL WINNER, or do you have a NEW ELECTION? A Massive Fraud of this type and magnitude allows for the termination of all rules, regulations, and articles, even those found in the Constitution. Our great "Founders" did not want, and would not condone, False & Fraudulent Elections! Trump's remarks were condemned by multiple parties, including the White House. In The Week, Damon Linker described it as the moment Trump "finally jumped the shark". Subsequently, Trump denied he called for the termination of the Constitution but maintained that any election misconduct should be undone. In August 2023, following special counsel's Jack Smith's indictment of Trump for charges related to the 2020 presidential election, Trump posted "IF YOU GO AFTER ME, I’M COMING AFTER YOU!" to Truth Social. Investigators referred Trump's remarks to the judge responsible for the case, seeking a protective order. On August 25, 2023, Trump posted to X/Twitter regarding his arrest in Georgia in regard to the Georgia election racketeering prosecution. This was his first use of social media outside of Truth Social for some years. In April 2024, Trump was held in contempt of court in a New York court in relation to Truth Social posts about his hush money trial that violated a gag order made by the court. To comply with orders from the court, Trump deleted the postings from Truth Social. As a response to the October No King's protests, Trump posted an AI-generated video on his Truth Social account that showed him flying a fighter jet and dropping liquid feces on protesters. The video sparked various reactions on the internet, like outrage and ridicule. Speaker of the house Mike Johnson justified the video, describing it as “satire” posted to make a "point". Devin Nunes, the CEO of Truth Social, posted a meme on the platform in October 2022 making a joke about the attack on Paul Pelosi, while referencing inaccurate reports that the attacker was in his underwear at the time. Nunes was widely criticized by Twitter users for doing this. On June 16, 2022, California Governor Gavin Newsom announced he had joined Truth Social, writing on his Twitter account "I just joined Trump's Truth Social. Going to be on there calling out Republican lies. This could get…interesting. My first post – breaking down America's red state murder problem." As of August 2024[update], his account still exists as a verified user and he has still been semi-active on the platform. Truth Social has been described as an alt-tech social media platform. Such platforms are popular among the alt-right, far-right, and others who espouse extremism or fringe theories, often because they employ less stringent content moderation than mainstream platforms. Axios reported that Truth Social had given a verified account to the white nationalist advocate Nick Fuentes, who has been banned from Twitter and Facebook. On August 11, 2022, a gunman, identified as Ricky Shiffer, wearing body armor and armed with a nail gun and an AR-15 style rifle attempted to storm the offices of the Federal Bureau of Investigation (FBI) in Cincinnati, Ohio. Following a subsequent police pursuit, he was killed in a standoff with police. Shiffer had published multiple posts on Truth Social in the days before the attack, following the FBI search of Mar-a-Lago, in which he expressed his desire to engage in violence and called for the killings of FBI agents. He also reportedly wrote a post on Truth Social following the attack, which detailed his failed attempt to storm the building. Since Shiffer's actions, some Truth Social users — including a verified account with 74,000 followers who said he was a designer for the site — claimed the attack was a false flag, without providing evidence, and the calls for violence were posts planted by federal law enforcement officials or Democratic operatives. In August 2023, Truth Social notified the FBI that Craig DeLeeuw Robertson had used Truth Social to make death threats against President Joe Biden. Robertson was later shot and killed at an armed standoff with FBI agents. Robertson, who had previously made death threats to multiple people and posted that he had a rifle he described as a "democrat eradicator", was a registered Republican who described himself as a "Maga Trumper". Axios reported in February 2022 that Truth Social had official-looking accounts for Fox News, TMZ, the National Football League, NASA, NASCAR, and others with legitimate-appearing links and logos, which had not been created by the named entities. The accounts were labelled as "bot" accounts. The Fox News account has since been verified by the platform. By April 2022, a bot account for The New York Times was labeled "The Failing NY Times", while a CNN bot account was labeled "CNN (Parody)". The Biden–Harris 2024 re-election campaign created an account on Truth Social in October 2023 known as "BidenHQ". It announced on the social media platform Twitter that it had created the account on Truth Social because it found the idea "very funny". Numerous observers characterised this as an exercise by the Biden campaign in trolling Donald Trump. Two days after the creation of the account, Axios reported that the Biden campaign's Truth Social account had more followers than that of the Trump campaign. The account was later rebranded as "HarrisHQ" in July 2024 following Joe Biden's withdrawal from the election and endorsement of Vice President Kamala Harris, who later became the democratic nominee for president but ultimately lost the general election to Trump. See also References External links |
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[SOURCE: https://en.wikipedia.org/wiki/Oculus_VR] | [TOKENS: 5735] |
Contents Reality Labs Reality Labs, formerly Oculus VR, is a business and research unit of Meta Platforms (formerly Facebook Inc.) that produces virtual reality (VR) and augmented reality (AR) hardware and software, including virtual reality headsets such as the Quest, and online platforms such as Horizon Worlds. In June 2022, several artificial intelligence (AI) initiatives that were previously a part of Meta AI were transitioned to Reality Labs. This also includes Meta's fundamental AI Research laboratory FAIR which is now part of the Reality Labs - Research (RLR) division. The Reality Labs unit is the result of the merger of several initiatives under Meta Platforms and the incorporation of several acquired companies. This includes CTRL-Labs founded by Thomas Reardon which develops non-invasive neural interface technology as well as Oculus, a company that was founded in 2012 by Palmer Luckey, Brendan Iribe, Michael Antonov and Nate Mitchell to develop a VR headset for video gaming. History As a head-mounted display (HMD) designer at the University of Southern California Institute for Creative Technologies, Palmer Luckey earned a reputation for having the largest personal collection of HMDs in the world and was a longtime moderator in Meant to be Seen (MTBS)'s discussion forums. Palmer created a series of new technologies that resulted in a VR headset that was both higher performance than what was currently on the market and was also inexpensive for gamers. To develop the new product, Luckey founded Oculus VR with Scaleform co-founders Brendan Iribe and Michael Antonov, Nate Mitchell and Andrew Scott Reisse. Coincidentally, John Carmack of id Software had been doing his research on HMDs and happened upon Palmer's developments. After sampling an early unit, Carmack favored Luckey's prototype, and just before the 2012 Electronic Entertainment Expo (E3), id Software announced that the BFG Edition of Doom 3 would be compatible with head-mounted display units. During the convention, Carmack introduced a duct-taped head-mounted display, based on Palmer's Oculus Rift prototype, which ran Carmack's software. The unit featured a high-speed IMU and a 5.6-inch (14 cm) LCD, visible via dual lenses that were positioned over the eyes to provide a 90 degree horizontal and 110 degree vertical stereoscopic 3D perspective. Carmack later left id Software as he was hired as Oculus VR's chief technology officer. The Oculus Rift prototype was demonstrated at E3 in June 2012. On August 1, 2012, the company announced a Kickstarter campaign to further develop the product. Oculus announced that the "dev kit" version of the Oculus Rift would be given as a reward to backers who pledged $300 or more on Kickstarter, with an expected shipping date set of December 2012 (though they did not actually ship until March 2013). There was also a limited run of 100 unassembled Rift prototype kits for pledges over $275 that would ship a month earlier. Both versions were intended to include Doom 3 BFG Edition, but Rift support in the game was not ready, so to make up for it they included a choice of discount vouchers for either Steam or the Oculus store.[citation needed] Within four hours of the announcement, Oculus secured its intended amount of US$250,000, and in less than 36 hours, the campaign had surpassed $1 million in funding, eventually ending with $2,437,429. On December 12, 2013, Marc Andreessen joined the company's board when his firm, Andreessen Horowitz, led the $75 million Series B venture funding. In total, Oculus VR has raised $91 million with $2.4 million raised via crowdfunding.[citation needed] Although Oculus only released a development prototype of its headset, on March 25, 2014, Mark Zuckerberg announced that Facebook, Inc. would be acquiring Oculus for US$2 billion, pending regulatory approval. The deal included $400 million in cash and 23.1 million common shares of Facebook, valued at $1.6 billion, as well as an additional $300 million assuming Facebook reaches certain milestones. This move was ridiculed by some backers who felt the acquisition was counter to the independent ideology of crowdfunding. Many Kickstarter backers and game industry figures, such as Minecraft developer Markus Persson, criticized the sale of Oculus to Facebook. On March 28, 2014, Michael Abrash joined the company as Chief Scientist. As of January 2015, the Oculus headquarters has been moved from Irvine, California to Menlo Park, where Facebook's headquarters are also located. Oculus has stated that this move is for their employees to be closer to Silicon Valley. In May 2015, Oculus acquired British company Surreal Vision, a company based on 3D scene-mapping reconstruction and augmented reality. News reported that Oculus and Surreal Vision could create "mixed reality" technology in Oculus' products, similar to the upcoming HMD, Microsoft HoloLens. They reported that Oculus, with Surreal's help, will make telepresence possible. On March 28, 2016, the first consumer version of Oculus Rift, Oculus Rift "CV1", was released. In October 2017, Oculus unveiled the standalone mobile headset Oculus Go in partnership with Chinese electronics manufacturer Xiaomi. On December 28, 2016, Facebook acquired Danish eye tracking startup The Eye Tribe. In September 2018, Oculus became a division of a new structural entity within Facebook known as Facebook Technologies, LLC. Facebook announced in August 2018 they had entered negotiations to lease the entire Burlingame Point campus in Burlingame, California, then under construction. The lease was executed in late 2018, and the site, owned by Kylli, a subsidiary of Genzon Investment Group, is expected to be complete by 2020. Oculus was expected to move to Burlingame Point when development is complete. In February 2019, Facebook released Oculus Quest, a high-end standalone headset. In March 2019, Facebook unveiled Oculus Rift S, an updated revision of the original Rift PC headset in partnership with Chinese electronics manufacturer Lenovo, which featured updated hardware and features carried over from the Go and Quest. On August 13, 2019, Nate Mitchell, Oculus co-founder and VP of product announced his departure from the company. On November 13, 2019, John Carmack wrote in a Facebook post that he would step down as CTO of Oculus to focus on developing artificial general intelligence. He stated he would remain involved with the company as a "Consulting CTO". In September 2020, Facebook unveiled Oculus Quest 2, an update to the original Quest with a revised design and updated hardware. Upon the acquisition of Oculus by Facebook, Inc., Luckey "guaranteed" that "you won't need to log into your Facebook account every time you wanna use the Oculus Rift." Under its ownership, Oculus has been promoted as a brand of Facebook rather than an independent entity and has increasingly integrated Facebook platforms into Oculus products. Support for optional Facebook integration was added to Gear VR in March 2016, with a focus on integration with the social network, and integrations with features such as Facebook Video and social games. By 2016, the division began to be largely marketed as Oculus from Facebook. In September 2016, support for optional Facebook integration was added to the Oculus Rift software, automatically populating the friends list with Facebook friends who have also linked their accounts (displaying them to each other under their real names, but still displaying screen names to anyone else). Users have been increasingly encouraged to use Facebook accounts to sign into its services (although standalone accounts not directly linked to the service were still supported). In 2018, Oculus VR became a division of Facebook Technologies, LLC, to create "a single legal entity that can support multiple Facebook technology and hardware products" (such as Facebook Portal). On August 18, 2020, Facebook announced that all "decisions around use, processing, retention, and sharing of [user] data" on its platforms will be delegated to the Facebook social network moving forward. Users became subject to the unified Facebook privacy policy, code of conduct, and community guidelines, and all users will be required to have a Facebook account to access Oculus products and services. Standalone account registration became unavailable in October 2020, all future Oculus hardware (beginning with Quest 2) will only support Facebook accounts, and support for existing standalone Oculus accounts on already-released products will end on January 1, 2023. Facebook stated that this was needed to facilitate "more Facebook powered multiplayer and social experiences" and make it "easier to share across our platforms". Facebook stated that users would still be able to control sharing from Oculus, maintain a separate friends list within the Oculus platform, and hide their real name to others. Users and media criticized Facebook for the move. Ars Technica noted that there is no clear way to opt-out of information tracking and that the collected data will likely be used for targeted advertising. Furthermore, Facebook requires the use of a person's real name. In September 2020, Facebook temporarily suspended sales of all Oculus products in Germany; a German watchdog had presented concerns that this integration requirement violates the General Data Protection Regulation (GDPR), which prohibits making use of a service contingent on consenting to the collection of personally identifiable information, and the requirement that existing users also link to a Facebook account to use Oculus hardware and services. On August 25, 2020, Facebook announced the formation of Facebook Reality Labs, a new unit that would encompass all of Facebook's virtual and augmented reality (AR) hardware and software, including Oculus, Portal, and Facebook Spark AR. The Oculus Connect conference was also renamed Facebook Connect. In June 2021, Facebook announced it would do a test launch of targeted advertisements in applications for Oculus Quest. The company claims that movement data, voice recordings and raw images from the headset will not be used in targeting. Instead, the ads will rely on information from the user's Facebook profile and all user activity related to Oculus, including apps used or installed. The company has not stated whether ads will appear only in applications or in the Oculus Home experience as well. In July 2021, Facebook announced it would be deprecating its proprietary Oculus API and adding full support for OpenXR. On October 25, 2021, during Connect, Facebook announced that it would invest $10 billion over the next year into Reality Labs, and that it would begin to report its revenue separately from the Facebook "Family of Apps"—which includes Facebook, Messenger, Instagram, and WhatsApp. Three days later on October 28, Facebook announced that it would change its corporate name to Meta (legally Meta Platforms, Inc.), as part of the company's long-term focus on metaverses and related technologies. The company also teased a "high-end" mixed reality headset codenamed "Project Cambria". As a result, CTO Andrew Bosworth announced that the Oculus brand would be phased out in 2022; all Facebook hardware products will be marketed under the Meta name, and Oculus Store would be renamed Quest Store. Likewise, immersive social platforms associated with Oculus will be brought under the Horizon brand (such as Horizon Worlds). He also stated that "as we've heard feedback from the VR community more broadly, we're working on new ways to log into Quest that won't require a Facebook account, landing sometime next year. This is one of our highest priority areas of work internally". In January 2022, the Oculus social media accounts were renamed "Meta Quest" in reference to its current VR product line. Concurrently, Meta began to retroactively refer to the Quest 2 as the "Meta Quest 2"—a change that has since been reflected in the packaging and hardware of subsequent units. In July 2022, Meta began to migrate Oculus accounts to the new "Meta account" system, which can be optionally linked with Facebook, Instagram, and WhatsApp accounts. In October 2022, "Project Cambria" was officially unveiled as the Meta Quest Pro. In January 2026, Reality Labs cut 10% of Reality Lab jobs as part of a streamlining of its VR investments to increase quality of software and hardware to make the business "more sustainable". Meta plans to stop sales of commercial SKUs of Meta Quest headsets on February 20, 2026 as part of this quality streamlining effort. As of January 2026, Reality Labs has accumulated a total of $80 billion in total operating losses since late 2020. Products The initial Oculus headsets, produced under the "Oculus Rift" brand, are traditional VR headsets that require a PC to operate. In February 2019, Facebook first released Oculus Quest—a standalone headset which contains integrated mobile computing hardware and does not require a PC to operate, but can optionally be used with Oculus Rift-compatible VR software by connecting it to a PC over USB-C. In 2018, Facebook CEO Mark Zuckerberg stated that the original Oculus Rift "CV1", Oculus Go (a lower-end standalone headset released in 2017), and Quest represented the company's first generation of products, and expected that successors to the three headsets would form its second generation. Oculus began to phase out the original Oculus Rift "CV1" in 2019, in favor of Oculus Rift S — a follow-up to the original model manufactured by Lenovo that incorporates elements of the Go and Quest. In September 2020, the Oculus Quest 2 was unveiled as an updated iteration of the first-generation Quest, and the Rift S was concurrently discontinued—making Quest the division's sole active product line. On September 26, 2018, Facebook unveiled Oculus Quest. It is a standalone headset which is not dependent on a PC for operation; the Quest contains embedded mobile hardware running an operating system based on Android source code, including a Snapdragon 835 system-on-chip, and 64 or 128 GB of internal storage. It contains two OLED displays with a resolution of 1600x1440 per-eye and running at 72 Hz. It supports included Oculus Touch controllers via an "inside-out" motion tracking system known as "Oculus insight", which consists of a series of cameras embedded in the headset. The controllers were redesigned to properly function with Insight. It supports games and applications downloaded via Oculus Store, with ported launch titles such as Beat Saber and Robo Recall. It also supports cross-platform multiplayer and cross-buys between PC and Quest. Facebook stated that they would impose stricter content and quality standards for software distributed for Quest than its other platforms, including requiring developers to undergo a pre-screening of their concepts to demonstrate "quality and probable market success". In June 2019, Facebook announced it sold $5 million worth of content for the Oculus Quest in its first two weeks on sale. In November 2019, Facebook released a beta for a new feature known as Oculus Link, which allows Oculus Rift-compatible software to be streamed from a PC to a Quest headset over USB. In May 2020, Facebook added additional support for the use of USB 2.0 cables, such as the charging cable supplied with the headset. Support for controller-free hand tracking was also launched that month. In September 2020, Facebook unveiled an updated version of the Quest, Oculus Quest 2. It is similar to the original Quest, but with the Snapdragon XR2 system-on-chip and additional RAM, an all plastic exterior, new cloth head straps, updated Oculus Touch controllers with improved ergonomics and battery life, and a 1832x1920 display running at 90 Hz, and up to 120 Hz as an experimental option. Similarly to the Rift S, it uses a single display panel rather than individual panels for each eye. Due to this design, it has more limited inter-pupillary distance options than the original Quest, with the ability to physically move the lenses to adjust for 3 common measurements. The Quest 2's models were both priced US$100 cheaper than their first-generation equivalents at launch, but its prices were increased in July 2022 for economic reasons. In October 2022, Meta unveiled Quest Pro, a mixed reality headset aimed primarily at enterprise and prosumer markets. The headset uses quantum dot displays, with thinner optics using pancake lenses for a more visor-like form factor, and has upgraded color passthrough cameras designed to facilitate mixed reality applications. Its hardware is upgraded from the Quest 2, with the Snapdragon XR2+ system-on-chip, increased RAM, and updated controllers with built-in tracking. These controllers were also made available for the existing Quest 2 as an optional accessory. On June 1, 2023, Meta announced the Quest 3, which was released on October 10, 2023. It features design and hardware features from the Quest Pro, including pancake lenses for a slimmer build, upgraded hardware (including the Snapdragon XR2 Gen 2 system-on-chip) and higher resolution displays, color passthrough cameras for mixed reality, as well as a depth sensor, and updated controllers inspired by the design of the Quest Pro (albeit still using inside-out tracking via infrared sensors, as with its predecessors). Meta positioned the Quest 3 as a high-end model, with the Quest 2 continuing to be sold alongside it. On April 22, 2024, Meta announced that its Android-based system software would be branded as "Horizon OS", and that it would license the platform to third-parties. Meta announced initial hardware partners such as Asus and Lenovo, as well as a partnership with Microsoft for a "limited edition" Xbox-branded Quest bundled with Xbox Wireless Controllers and Game Pass. Meta also stated that it was developing a "spatial app framework" to help port non-VR Android apps to Horizon OS, and that it was open to working with Google to support Play Store on Horizon OS—moves considered a parallel to Apple's support of iOS applications on visionOS. In 2024, leaks by Meta revealed an upcoming Quest model known as the Quest 3S, which is expected to be a low-end variant of the Quest 3 designed to supplant the Quest 2. Quest 3s was unveiled on September 25, 2024, and released on October 15, 2024, as part of the third generation of the Meta Quest line, serving as a cheaper option for new and budget VR players. The Oculus Rift CV1, also known as simply the Oculus Rift, was the first consumer model of the Oculus Rift headset. It was released on March 28, 2016, in 20 countries, at a starting price of US$599. The 6,955 backers who received the Development Kit 1 prototype via the original Oculus Rift Kickstarter campaign were eligible to receive the CV1 model for free. On December 6, 2016, Oculus released motion controller accessories for the headset known as Oculus Touch. In 2014, Samsung partnered with Oculus to develop the Gear VR, a VR headset accessory for Samsung Galaxy smartphones. It relies on the phone's display, which is viewed through lenses inside the headset. At Oculus Connect in September 2015, the Gear VR was announced for a consumer release in November; the initial model supported the Galaxy S6 and Galaxy S7 product lines, as well as the Galaxy Note 5. On October 11, 2017, Oculus unveiled the Oculus Go, a mobile VR headset manufactured by Xiaomi (the device was released in the Chinese market as the Xiaomi Mi VR). Unlike the Oculus Rift, the Go is a standalone headset which is not dependent on a PC for operation. Unlike VR systems such as Cardboard, Daydream, and the Oculus co-developed Samsung Gear VR (where VR software is run on a smartphone inserted into a physical enclosure, and its screen is viewed through lenses), it contains its own dedicated display and mobile computing hardware. The headset includes a 5.5-inch 1440p fast-switching liquid-crystal display (LCD), integrated speakers with spatial audio and a headphone jack for external audio, a Qualcomm Snapdragon 821 system-on-chip, and 32 or 64 GB of internal storage. It runs an Android-based operating system with access to VR software via the Oculus Home user experience and app store, including games and multimedia apps. The Go includes a handheld controller reminiscent of one designed for the Gear VR, which uses relative motion tracking. The Oculus Go does not use positional tracking. While official sales numbers have not been released, according to IDC the Oculus Go and Xiaomi Mi VR had sold nearly a quarter million units combined during the third quarter 2018, and in January 2019 market analysis firm SuperData estimated that over a million Oculus Go units had been sold since the device's launch. In his keynote at 2018's Oculus Connect developer conference, John Carmack revealed that the Go's retention rate was as high as the Rift's, something that nobody at the company had predicted. Carmack also noted that the Go had done especially well in Japan despite lacking internationalization support and the company not specifically catering to the Japanese market. Oculus Go was declared end-of-life in June 2020, with software submissions to end in December 2020, and firmware support ending in 2022. On March 20, 2019, at the Game Developers Conference, Facebook announced the Oculus Rift S, a successor to the original Oculus Rift headset. It was co-developed with and manufactured by Lenovo, and launched at a price of US$399. The Rift S contains hardware features from the Oculus Go and Oculus Quest, including Oculus Insight, integrated speakers, and a new "halo" strap. The Rift S uses the same 1440p LCD and lenses as the Oculus Go (a higher resolution in comparison to the original model, but lower in comparison to Oculus Quest), running at 80 Hz, and is backwards compatible with all existing Oculus Rift games and software. Unlike the original Oculus Rift, it does not have hardware control for inter-pupillary distance. In September 2020, Facebook announced it would be discontinuing the Oculus Rift S and in April 2021, shipments of the headset ceased. 2064x2208 1832 x 1920 In September 2021, Reality Labs and Ray-Ban announced Ray-Ban Stories, a collaboration on camera-equipped smart glasses that can upload video to Facebook. In the following years, additional AI glasses have been released through Reality Labs' partnership with EssilorLuxotica including a premium version featuring a small heads-up display. Divisions Oculus Studios is a division of Meta that serves as an umbrella organization for its first-party game development studios such as Beat Games, Within and Camouflaj. Initially the division was more broadly focused on funding, publishing and giving technical advice to third & second party studios to create games and experiences for Oculus Rift. Meta pledged to invest more than US$500 million on Oculus Studios to make games and content. This period saw them build multi-game relationships with prominent studio partners in a second-party capacity, studios such as Insomniac Games, Twisted Pixel Games, Turtle Rock Studios, and Gunfire Games. As focus moved away from the Rift and towards the very successful Meta Quest 2, the priority shifted to acquiring developers as first-party studios, so they could make exclusive games inhouse instead. Starting in 2020, Meta purchased both Beat Games (Beat Saber) and Sanzaru Games (Asgard's Wrath) and integrated them into Oculus Studios. Ready at Dawn, a game studio composed of former members of Naughty Dog and Blizzard Entertainment (and had also developed the Oculus Rift exclusive Lone Echo) were acquired in June 2020. In 2021, Meta began a deliberate effort of buying up studios that had made strong sales on their Quest 2 platform. In April 2021, Downpour Interactive, the developer of the virtual reality FPS multiplayer game, Onward, were purchased. The team would migrate over to Oculus Studios, although the game would continue to receive updates on all supported VR platforms. In May 2021, Meta bought BigBox VR, the developers of the popular battle royale, Population One. In June 2021, Meta purchased Unit2 Games, the makers of Crayta, a free-to-play platform that allows players to create and share their games via Facebook Gaming. Finally in November 2021, Meta purchased the formerly Microsoft owned studio, Twisted Pixel Games. The developer had been a successful second-party studio for Meta since 2017, and had produced the VR games Wilson's Heart, B-Team, Defector, and Path of the Warrior, all exclusively for Oculus platforms. Additionally, in October 2021, Meta announced they were purchasing Within, the studio behind the successful VR fitness app, Supernatural. It was stated they would continue to operate independently as part of Reality Labs. Later that year the FTC conducted a probe into the 400 million dollar deal. In July 2022, the FTC attempted to sue Meta, as it was felt with the purchase of the studios behind both Beat Saber and Supernatural, they would unfairly corner the VR fitness market. This legal action has blocked the purchase indefinitely. In February 2023 the FTC lawsuit was denied and the purchase of Within went ahead for Meta. At the Meta Connect 2022 event in October, Meta announced that they had acquired Armature Studio and Camouflaj as new members of Oculus Studios. Armature had created the highly popular Quest 2 VR port of Resident Evil 4. Camouflaj were best known for making Republique, and the PSVR exclusive Iron Man VR for Sony - this deal would see them port the latter game to the Quest 2 platform. On January 13, 2026, it was announced that Sanzaru Games, Twisted Pixel, and Armature Studio would be closed in Meta's effort to streamline and improve quality of Horizon OS and future VR HMDs, and help fund AI research and AR wearables. In 2023, Meta announced the formation of a new division called Oculus Publishing aimed at third-party content funding, development support, and marketing. According to Meta, Oculus Publishing has been involved in the publishing of 300 titles including Among Us VR, Bonelab, The Walking Dead: Saints & Sinners, and Blade & Sorcery: Nomad. Oculus Story Studio was an original animated virtual-reality film studio that existed between 2014 and May 2017, which launched three films. The studio aimed to pioneer animated virtual reality filmmaking and educate, inspire, and foster community for filmmakers interested in VR. Oculus Story Studio was first launched publicly at the 2015 Sundance Film Festival, where it presented three VR films - Dear Angelica, Henry, and Lost. Despite generally positive reception and critical acclaim, the studio did not publish any other works and was closed in May 2017. Litigation Following Facebook's acquisition of Oculus VR, ZeniMax Media, the parent company of id Software and John Carmack's previous employer, sought legal action against Oculus, accusing the company of theft of intellectual property relating to the Oculus Rift due to Carmack's transition from id Software to Oculus. The case, ZeniMax v. Oculus, was heard in a jury trial in the United States District Court for the Northern District of Texas, and their verdict was reached in February 2017, finding that Carmack had taken code from ZeniMax and used it in developing the Oculus Rift's software, violating his non-disclosure agreement with ZeniMax, and Oculus' use of the code was considered copyright infringement. ZeniMax was awarded $500 million in the jury verdict, later reduced to $250 million by the presiding judge, and the case was resolved in December 2018 through a confidential settlement agreement. In May 2022, Immersion Corporation sued Meta Platforms for patent infringement relating to the use of vibration functions in their gaming controllers. See also References External links |
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