text stringlengths 0 473k |
|---|
[SOURCE: https://en.wikipedia.org/wiki/Mars#cite_ref-2023Natur.622..712S_48-1] | [TOKENS: 11899] |
Contents Mars Mars is the fourth planet from the Sun. It is also known as the "Red Planet", for its orange-red appearance. Mars is a desert-like rocky planet with a tenuous atmosphere that is primarily carbon dioxide (CO2). At the average surface level the atmospheric pressure is a few thousandths of Earth's, atmospheric temperature ranges from −153 to 20 °C (−243 to 68 °F), and cosmic radiation is high. Mars retains some water, in the ground as well as thinly in the atmosphere, forming cirrus clouds, fog, frost, larger polar regions of permafrost and ice caps (with seasonal CO2 snow), but no bodies of liquid surface water. Its surface gravity is roughly a third of Earth's or double that of the Moon. Its diameter, 6,779 km (4,212 mi), is about half the Earth's, or twice the Moon's, and its surface area is the size of all the dry land of Earth. Fine dust is prevalent across the surface and the atmosphere, being picked up and spread at the low Martian gravity even by the weak wind of the tenuous atmosphere. The terrain of Mars roughly follows a north-south divide, the Martian dichotomy, with the northern hemisphere mainly consisting of relatively flat, low lying plains, and the southern hemisphere of cratered highlands. Geologically, the planet is fairly active with marsquakes trembling underneath the ground, but also hosts many enormous volcanoes that are extinct (the tallest is Olympus Mons, 21.9 km or 13.6 mi tall), as well as one of the largest canyons in the Solar System (Valles Marineris, 4,000 km or 2,500 mi long). Mars has two natural satellites that are small and irregular in shape: Phobos and Deimos. With a significant axial tilt of 25 degrees, Mars experiences seasons, like Earth (which has an axial tilt of 23.5 degrees). A Martian solar year is equal to 1.88 Earth years (687 Earth days), a Martian solar day (sol) is equal to 24.6 hours. Mars formed along with the other planets approximately 4.5 billion years ago. During the martian Noachian period (4.5 to 3.5 billion years ago), its surface was marked by meteor impacts, valley formation, erosion, the possible presence of water oceans and the loss of its magnetosphere. The Hesperian period (beginning 3.5 billion years ago and ending 3.3–2.9 billion years ago) was dominated by widespread volcanic activity and flooding that carved immense outflow channels. The Amazonian period, which continues to the present, is the currently dominating and remaining influence on geological processes. Because of Mars's geological history, the possibility of past or present life on Mars remains an area of active scientific investigation, with some possible traces needing further examination. Being visible with the naked eye in Earth's sky as a red wandering star, Mars has been observed throughout history, acquiring diverse associations in different cultures. In 1963 the first flight to Mars took place with Mars 1, but communication was lost en route. The first successful flyby exploration of Mars was conducted in 1965 with Mariner 4. In 1971 Mariner 9 entered orbit around Mars, being the first spacecraft to orbit any body other than the Moon, Sun or Earth; following in the same year were the first uncontrolled impact (Mars 2) and first successful landing (Mars 3) on Mars. Probes have been active on Mars continuously since 1997. At times, more than ten probes have simultaneously operated in orbit or on the surface, more than at any other planet beyond Earth. Mars is an often proposed target for future crewed exploration missions, though no such mission is currently planned. Natural history Scientists have theorized that during the Solar System's formation, Mars was created as the result of a random process of run-away accretion of material from the protoplanetary disk that orbited the Sun. Mars has many distinctive chemical features caused by its position in the Solar System. Elements with comparatively low boiling points, such as chlorine, phosphorus, and sulfur, are much more common on Mars than on Earth; these elements were probably pushed outward by the young Sun's energetic solar wind. After the formation of the planets, the inner Solar System may have been subjected to the so-called Late Heavy Bombardment. About 60% of the surface of Mars shows a record of impacts from that era, whereas much of the remaining surface is probably underlain by immense impact basins caused by those events. However, more recent modeling has disputed the existence of the Late Heavy Bombardment. There is evidence of an enormous impact basin in the Northern Hemisphere of Mars, spanning 10,600 by 8,500 kilometres (6,600 by 5,300 mi), or roughly four times the size of the Moon's South Pole–Aitken basin, which would be the largest impact basin yet discovered if confirmed. It has been hypothesized that the basin was formed when Mars was struck by a Pluto-sized body about four billion years ago. The event, thought to be the cause of the Martian hemispheric dichotomy, created the smooth Borealis basin that covers 40% of the planet. A 2023 study shows evidence, based on the orbital inclination of Deimos (a small moon of Mars), that Mars may once have had a ring system 3.5 billion years to 4 billion years ago. This ring system may have been formed from a moon, 20 times more massive than Phobos, orbiting Mars billions of years ago; and Phobos would be a remnant of that ring. Epochs: The geological history of Mars can be split into many periods, but the following are the three primary periods: Geological activity is still taking place on Mars. The Athabasca Valles is home to sheet-like lava flows created about 200 million years ago. Water flows in the grabens called the Cerberus Fossae occurred less than 20 million years ago, indicating equally recent volcanic intrusions. The Mars Reconnaissance Orbiter has captured images of avalanches. Physical characteristics Mars is approximately half the diameter of Earth or twice that of the Moon, with a surface area only slightly less than the total area of Earth's dry land. Mars is less dense than Earth, having about 15% of Earth's volume and 11% of Earth's mass, resulting in about 38% of Earth's surface gravity. Mars is the only presently known example of a desert planet, a rocky planet with a surface akin to that of Earth's deserts. The red-orange appearance of the Martian surface is caused by iron(III) oxide (nanophase Fe2O3) and the iron(III) oxide-hydroxide mineral goethite. It can look like butterscotch; other common surface colors include golden, brown, tan, and greenish, depending on the minerals present. Like Earth, Mars is differentiated into a dense metallic core overlaid by less dense rocky layers. The outermost layer is the crust, which is on average about 42–56 kilometres (26–35 mi) thick, with a minimum thickness of 6 kilometres (3.7 mi) in Isidis Planitia, and a maximum thickness of 117 kilometres (73 mi) in the southern Tharsis plateau. For comparison, Earth's crust averages 27.3 ± 4.8 km in thickness. The most abundant elements in the Martian crust are silicon, oxygen, iron, magnesium, aluminum, calcium, and potassium. Mars is confirmed to be seismically active; in 2019, it was reported that InSight had detected and recorded over 450 marsquakes and related events. Beneath the crust is a silicate mantle responsible for many of the tectonic and volcanic features on the planet's surface. The upper Martian mantle is a low-velocity zone, where the velocity of seismic waves is lower than surrounding depth intervals. The mantle appears to be rigid down to the depth of about 250 km, giving Mars a very thick lithosphere compared to Earth. Below this the mantle gradually becomes more ductile, and the seismic wave velocity starts to grow again. The Martian mantle does not appear to have a thermally insulating layer analogous to Earth's lower mantle; instead, below 1050 km in depth, it becomes mineralogically similar to Earth's transition zone. At the bottom of the mantle lies a basal liquid silicate layer approximately 150–180 km thick. The Martian mantle appears to be highly heterogenous, with dense fragments up to 4 km across, likely injected deep into the planet by colossal impacts ~4.5 billion years ago; high-frequency waves from eight marsquakes slowed as they passed these localized regions, and modeling indicates the heterogeneities are compositionally distinct debris preserved because Mars lacks plate tectonics and has a sluggishly convecting interior that prevents complete homogenization. Mars's iron and nickel core is at least partially molten, and may have a solid inner core. It is around half of Mars's radius, approximately 1650–1675 km, and is enriched in light elements such as sulfur, oxygen, carbon, and hydrogen. The temperature of the core is estimated to be 2000–2400 K, compared to 5400–6230 K for Earth's solid inner core. In 2025, based on data from the InSight lander, a group of researchers reported the detection of a solid inner core 613 kilometres (381 mi) ± 67 kilometres (42 mi) in radius. Mars is a terrestrial planet with a surface that consists of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. The Martian surface is primarily composed of tholeiitic basalt, although parts are more silica-rich than typical basalt and may be similar to andesitic rocks on Earth, or silica glass. Regions of low albedo suggest concentrations of plagioclase feldspar, with northern low albedo regions displaying higher than normal concentrations of sheet silicates and high-silicon glass. Parts of the southern highlands include detectable amounts of high-calcium pyroxenes. Localized concentrations of hematite and olivine have been found. Much of the surface is deeply covered by finely grained iron(III) oxide dust. The Phoenix lander returned data showing Martian soil to be slightly alkaline and containing elements such as magnesium, sodium, potassium and chlorine. These nutrients are found in soils on Earth, and are necessary for plant growth. Experiments performed by the lander showed that the Martian soil has a basic pH of 7.7, and contains 0.6% perchlorate by weight, concentrations that are toxic to humans. Streaks are common across Mars and new ones appear frequently on steep slopes of craters, troughs, and valleys. The streaks are dark at first and get lighter with age. The streaks can start in a tiny area, then spread out for hundreds of metres. They have been seen to follow the edges of boulders and other obstacles in their path. The commonly accepted hypotheses include that they are dark underlying layers of soil revealed after avalanches of bright dust or dust devils. Several other explanations have been put forward, including those that involve water or even the growth of organisms. Environmental radiation levels on the surface are on average 0.64 millisieverts of radiation per day, and significantly less than the radiation of 1.84 millisieverts per day or 22 millirads per day during the flight to and from Mars. For comparison the radiation levels in low Earth orbit, where Earth's space stations orbit, are around 0.5 millisieverts of radiation per day. Hellas Planitia has the lowest surface radiation at about 0.342 millisieverts per day, featuring lava tubes southwest of Hadriacus Mons with potentially levels as low as 0.064 millisieverts per day, comparable to radiation levels during flights on Earth. Although Mars has no evidence of a structured global magnetic field, observations show that parts of the planet's crust have been magnetized, suggesting that alternating polarity reversals of its dipole field have occurred in the past. This paleomagnetism of magnetically susceptible minerals is similar to the alternating bands found on Earth's ocean floors. One hypothesis, published in 1999 and re-examined in October 2005 (with the help of the Mars Global Surveyor), is that these bands suggest plate tectonic activity on Mars four billion years ago, before the planetary dynamo ceased to function and the planet's magnetic field faded. Geography and features Although better remembered for mapping the Moon, Johann Heinrich von Mädler and Wilhelm Beer were the first areographers. They began by establishing that most of Mars's surface features were permanent and by more precisely determining the planet's rotation period. In 1840, Mädler combined ten years of observations and drew the first map of Mars. Features on Mars are named from a variety of sources. Albedo features are named for classical mythology. Craters larger than roughly 50 km are named for deceased scientists and writers and others who have contributed to the study of Mars. Smaller craters are named for towns and villages of the world with populations of less than 100,000. Large valleys are named for the word "Mars" or "star" in various languages; smaller valleys are named for rivers. Large albedo features retain many of the older names but are often updated to reflect new knowledge of the nature of the features. For example, Nix Olympica (the snows of Olympus) has become Olympus Mons (Mount Olympus). The surface of Mars as seen from Earth is divided into two kinds of areas, with differing albedo. The paler plains covered with dust and sand rich in reddish iron oxides were once thought of as Martian "continents" and given names like Arabia Terra (land of Arabia) or Amazonis Planitia (Amazonian plain). The dark features were thought to be seas, hence their names Mare Erythraeum, Mare Sirenum and Aurorae Sinus. The largest dark feature seen from Earth is Syrtis Major Planum. The permanent northern polar ice cap is named Planum Boreum. The southern cap is called Planum Australe. Mars's equator is defined by its rotation, but the location of its Prime Meridian was specified, as was Earth's (at Greenwich), by choice of an arbitrary point; Mädler and Beer selected a line for their first maps of Mars in 1830. After the spacecraft Mariner 9 provided extensive imagery of Mars in 1972, a small crater (later called Airy-0), located in the Sinus Meridiani ("Middle Bay" or "Meridian Bay"), was chosen by Merton E. Davies, Harold Masursky, and Gérard de Vaucouleurs for the definition of 0.0° longitude to coincide with the original selection. Because Mars has no oceans, and hence no "sea level", a zero-elevation surface had to be selected as a reference level; this is called the areoid of Mars, analogous to the terrestrial geoid. Zero altitude was defined by the height at which there is 610.5 Pa (6.105 mbar) of atmospheric pressure. This pressure corresponds to the triple point of water, and it is about 0.6% of the sea level surface pressure on Earth (0.006 atm). For mapping purposes, the United States Geological Survey divides the surface of Mars into thirty cartographic quadrangles, each named for a classical albedo feature it contains. In April 2023, The New York Times reported an updated global map of Mars based on images from the Hope spacecraft. A related, but much more detailed, global Mars map was released by NASA on 16 April 2023. The vast upland region Tharsis contains several massive volcanoes, which include the shield volcano Olympus Mons. The edifice is over 600 km (370 mi) wide. Because the mountain is so large, with complex structure at its edges, giving a definite height to it is difficult. Its local relief, from the foot of the cliffs which form its northwest margin to its peak, is over 21 km (13 mi), a little over twice the height of Mauna Kea as measured from its base on the ocean floor. The total elevation change from the plains of Amazonis Planitia, over 1,000 km (620 mi) to the northwest, to the summit approaches 26 km (16 mi), roughly three times the height of Mount Everest, which in comparison stands at just over 8.8 kilometres (5.5 mi). Consequently, Olympus Mons is either the tallest or second-tallest mountain in the Solar System; the only known mountain which might be taller is the Rheasilvia peak on the asteroid Vesta, at 20–25 km (12–16 mi). The dichotomy of Martian topography is striking: northern plains flattened by lava flows contrast with the southern highlands, pitted and cratered by ancient impacts. It is possible that, four billion years ago, the Northern Hemisphere of Mars was struck by an object one-tenth to two-thirds the size of Earth's Moon. If this is the case, the Northern Hemisphere of Mars would be the site of an impact crater 10,600 by 8,500 kilometres (6,600 by 5,300 mi) in size, or roughly the area of Europe, Asia, and Australia combined, surpassing Utopia Planitia and the Moon's South Pole–Aitken basin as the largest impact crater in the Solar System. Mars is scarred by 43,000 impact craters with a diameter of 5 kilometres (3.1 mi) or greater. The largest exposed crater is Hellas, which is 2,300 kilometres (1,400 mi) wide and 7,000 metres (23,000 ft) deep, and is a light albedo feature clearly visible from Earth. There are other notable impact features, such as Argyre, which is around 1,800 kilometres (1,100 mi) in diameter, and Isidis, which is around 1,500 kilometres (930 mi) in diameter. Due to the smaller mass and size of Mars, the probability of an object colliding with the planet is about half that of Earth. Mars is located closer to the asteroid belt, so it has an increased chance of being struck by materials from that source. Mars is more likely to be struck by short-period comets, i.e., those that lie within the orbit of Jupiter. Martian craters can[discuss] have a morphology that suggests the ground became wet after the meteor impact. The large canyon, Valles Marineris (Latin for 'Mariner Valleys, also known as Agathodaemon in the old canal maps), has a length of 4,000 kilometres (2,500 mi) and a depth of up to 7 kilometres (4.3 mi). The length of Valles Marineris is equivalent to the length of Europe and extends across one-fifth the circumference of Mars. By comparison, the Grand Canyon on Earth is only 446 kilometres (277 mi) long and nearly 2 kilometres (1.2 mi) deep. Valles Marineris was formed due to the swelling of the Tharsis area, which caused the crust in the area of Valles Marineris to collapse. In 2012, it was proposed that Valles Marineris is not just a graben, but a plate boundary where 150 kilometres (93 mi) of transverse motion has occurred, making Mars a planet with possibly a two-tectonic plate arrangement. Images from the Thermal Emission Imaging System (THEMIS) aboard NASA's Mars Odyssey orbiter have revealed seven possible cave entrances on the flanks of the volcano Arsia Mons. The caves, named after loved ones of their discoverers, are collectively known as the "seven sisters". Cave entrances measure from 100 to 252 metres (328 to 827 ft) wide and they are estimated to be at least 73 to 96 metres (240 to 315 ft) deep. Because light does not reach the floor of most of the caves, they may extend much deeper than these lower estimates and widen below the surface. "Dena" is the only exception; its floor is visible and was measured to be 130 metres (430 ft) deep. The interiors of these caverns may be protected from micrometeoroids, UV radiation, solar flares and high energy particles that bombard the planet's surface. Martian geysers (or CO2 jets) are putative sites of small gas and dust eruptions that occur in the south polar region of Mars during the spring thaw. "Dark dune spots" and "spiders" – or araneiforms – are the two most visible types of features ascribed to these eruptions. Similarly sized dust will settle from the thinner Martian atmosphere sooner than it would on Earth. For example, the dust suspended by the 2001 global dust storms on Mars only remained in the Martian atmosphere for 0.6 years, while the dust from Mount Pinatubo took about two years to settle. However, under current Martian conditions, the mass movements involved are generally much smaller than on Earth. Even the 2001 global dust storms on Mars moved only the equivalent of a very thin dust layer – about 3 μm thick if deposited with uniform thickness between 58° north and south of the equator. Dust deposition at the two rover sites has proceeded at a rate of about the thickness of a grain every 100 sols. Atmosphere Mars lost its magnetosphere 4 billion years ago, possibly because of numerous asteroid strikes, so the solar wind interacts directly with the Martian ionosphere, lowering the atmospheric density by stripping away atoms from the outer layer. Both Mars Global Surveyor and Mars Express have detected ionized atmospheric particles trailing off into space behind Mars, and this atmospheric loss is being studied by the MAVEN orbiter. Compared to Earth, the atmosphere of Mars is quite rarefied. Atmospheric pressure on the surface today ranges from a low of 30 Pa (0.0044 psi) on Olympus Mons to over 1,155 Pa (0.1675 psi) in Hellas Planitia, with a mean pressure at the surface level of 600 Pa (0.087 psi). The highest atmospheric density on Mars is equal to that found 35 kilometres (22 mi) above Earth's surface. The resulting mean surface pressure is only 0.6% of Earth's 101.3 kPa (14.69 psi). The scale height of the atmosphere is about 10.8 kilometres (6.7 mi), which is higher than Earth's 6 kilometres (3.7 mi), because the surface gravity of Mars is only about 38% of Earth's. The atmosphere of Mars consists of about 96% carbon dioxide, 1.93% argon and 1.89% nitrogen along with traces of oxygen and water. The atmosphere is quite dusty, containing particulates about 1.5 μm in diameter which give the Martian sky a tawny color when seen from the surface. It may take on a pink hue due to iron oxide particles suspended in it. Despite repeated detections of methane on Mars, there is no scientific consensus as to its origin. One suggestion is that methane exists on Mars and that its concentration fluctuates seasonally. The existence of methane could be produced by non-biological process such as serpentinization involving water, carbon dioxide, and the mineral olivine, which is known to be common on Mars, or by Martian life. Compared to Earth, its higher concentration of atmospheric CO2 and lower surface pressure may be why sound is attenuated more on Mars, where natural sources are rare apart from the wind. Using acoustic recordings collected by the Perseverance rover, researchers concluded that the speed of sound there is approximately 240 m/s for frequencies below 240 Hz, and 250 m/s for those above. Auroras have been detected on Mars. Because Mars lacks a global magnetic field, the types and distribution of auroras there differ from those on Earth; rather than being mostly restricted to polar regions as is the case on Earth, a Martian aurora can encompass the planet. In September 2017, NASA reported radiation levels on the surface of the planet Mars were temporarily doubled, and were associated with an aurora 25 times brighter than any observed earlier, due to a massive, and unexpected, solar storm in the middle of the month. Mars has seasons, alternating between its northern and southern hemispheres, similar to on Earth. Additionally the orbit of Mars has, compared to Earth's, a large eccentricity and approaches perihelion when it is summer in its southern hemisphere and winter in its northern, and aphelion when it is winter in its southern hemisphere and summer in its northern. As a result, the seasons in its southern hemisphere are more extreme and the seasons in its northern are milder than would otherwise be the case. The summer temperatures in the south can be warmer than the equivalent summer temperatures in the north by up to 30 °C (54 °F). Martian surface temperatures vary from lows of about −110 °C (−166 °F) to highs of up to 35 °C (95 °F) in equatorial summer. The wide range in temperatures is due to the thin atmosphere which cannot store much solar heat, the low atmospheric pressure (about 1% that of the atmosphere of Earth), and the low thermal inertia of Martian soil. The planet is 1.52 times as far from the Sun as Earth, resulting in just 43% of the amount of sunlight. Mars has the largest dust storms in the Solar System, reaching speeds of over 160 km/h (100 mph). These can vary from a storm over a small area, to gigantic storms that cover the entire planet. They tend to occur when Mars is closest to the Sun, and have been shown to increase global temperature. Seasons also produce dry ice covering polar ice caps. Hydrology While Mars contains water in larger amounts, most of it is dust covered water ice at the Martian polar ice caps. The volume of water ice in the south polar ice cap, if melted, would be enough to cover most of the surface of the planet with a depth of 11 metres (36 ft). Water in its liquid form cannot persist on the surface due to Mars's low atmospheric pressure, which is less than 1% that of Earth. Only at the lowest of elevations are the pressure and temperature high enough for liquid water to exist for short periods. Although little water is present in the atmosphere, there is enough to produce clouds of water ice and different cases of snow and frost, often mixed with snow of carbon dioxide dry ice. Landforms visible on Mars strongly suggest that liquid water has existed on the planet's surface. Huge linear swathes of scoured ground, known as outflow channels, cut across the surface in about 25 places. These are thought to be a record of erosion caused by the catastrophic release of water from subsurface aquifers, though some of these structures have been hypothesized to result from the action of glaciers or lava. One of the larger examples, Ma'adim Vallis, is 700 kilometres (430 mi) long, much greater than the Grand Canyon, with a width of 20 kilometres (12 mi) and a depth of 2 kilometres (1.2 mi) in places. It is thought to have been carved by flowing water early in Mars's history. The youngest of these channels is thought to have formed only a few million years ago. Elsewhere, particularly on the oldest areas of the Martian surface, finer-scale, dendritic networks of valleys are spread across significant proportions of the landscape. Features of these valleys and their distribution strongly imply that they were carved by runoff resulting from precipitation in early Mars history. Subsurface water flow and groundwater sapping may play important subsidiary roles in some networks, but precipitation was probably the root cause of the incision in almost all cases. Along craters and canyon walls, there are thousands of features that appear similar to terrestrial gullies. The gullies tend to be in the highlands of the Southern Hemisphere and face the Equator; all are poleward of 30° latitude. A number of authors have suggested that their formation process involves liquid water, probably from melting ice, although others have argued for formation mechanisms involving carbon dioxide frost or the movement of dry dust. No partially degraded gullies have formed by weathering and no superimposed impact craters have been observed, indicating that these are young features, possibly still active. Other geological features, such as deltas and alluvial fans preserved in craters, are further evidence for warmer, wetter conditions at an interval or intervals in earlier Mars history. Such conditions necessarily require the widespread presence of crater lakes across a large proportion of the surface, for which there is independent mineralogical, sedimentological and geomorphological evidence. Further evidence that liquid water once existed on the surface of Mars comes from the detection of specific minerals such as hematite and goethite, both of which sometimes form in the presence of water. The chemical signature of water vapor on Mars was first unequivocally demonstrated in 1963 by spectroscopy using an Earth-based telescope. In 2004, Opportunity detected the mineral jarosite. This forms only in the presence of acidic water, showing that water once existed on Mars. The Spirit rover found concentrated deposits of silica in 2007 that indicated wet conditions in the past, and in December 2011, the mineral gypsum, which also forms in the presence of water, was found on the surface by NASA's Mars rover Opportunity. It is estimated that the amount of water in the upper mantle of Mars, represented by hydroxyl ions contained within Martian minerals, is equal to or greater than that of Earth at 50–300 parts per million of water, which is enough to cover the entire planet to a depth of 200–1,000 metres (660–3,280 ft). On 18 March 2013, NASA reported evidence from instruments on the Curiosity rover of mineral hydration, likely hydrated calcium sulfate, in several rock samples including the broken fragments of "Tintina" rock and "Sutton Inlier" rock as well as in veins and nodules in other rocks like "Knorr" rock and "Wernicke" rock. Analysis using the rover's DAN instrument provided evidence of subsurface water, amounting to as much as 4% water content, down to a depth of 60 centimetres (24 in), during the rover's traverse from the Bradbury Landing site to the Yellowknife Bay area in the Glenelg terrain. In September 2015, NASA announced that they had found strong evidence of hydrated brine flows in recurring slope lineae, based on spectrometer readings of the darkened areas of slopes. These streaks flow downhill in Martian summer, when the temperature is above −23 °C, and freeze at lower temperatures. These observations supported earlier hypotheses, based on timing of formation and their rate of growth, that these dark streaks resulted from water flowing just below the surface. However, later work suggested that the lineae may be dry, granular flows instead, with at most a limited role for water in initiating the process. A definitive conclusion about the presence, extent, and role of liquid water on the Martian surface remains elusive. Researchers suspect much of the low northern plains of the planet were covered with an ocean hundreds of meters deep, though this theory remains controversial. In March 2015, scientists stated that such an ocean might have been the size of Earth's Arctic Ocean. This finding was derived from the ratio of protium to deuterium in the modern Martian atmosphere compared to that ratio on Earth. The amount of Martian deuterium (D/H = 9.3 ± 1.7 10−4) is five to seven times the amount on Earth (D/H = 1.56 10−4), suggesting that ancient Mars had significantly higher levels of water. Results from the Curiosity rover had previously found a high ratio of deuterium in Gale Crater, though not significantly high enough to suggest the former presence of an ocean. Other scientists caution that these results have not been confirmed, and point out that Martian climate models have not yet shown that the planet was warm enough in the past to support bodies of liquid water. Near the northern polar cap is the 81.4 kilometres (50.6 mi) wide Korolev Crater, which the Mars Express orbiter found to be filled with approximately 2,200 cubic kilometres (530 cu mi) of water ice. In November 2016, NASA reported finding a large amount of underground ice in the Utopia Planitia region. The volume of water detected has been estimated to be equivalent to the volume of water in Lake Superior (which is 12,100 cubic kilometers). During observations from 2018 through 2021, the ExoMars Trace Gas Orbiter spotted indications of water, probably subsurface ice, in the Valles Marineris canyon system. Orbital motion Mars's average distance from the Sun is roughly 230 million km (143 million mi), and its orbital period is 687 (Earth) days. The solar day (or sol) on Mars is only slightly longer than an Earth day: 24 hours, 39 minutes, and 35.244 seconds. A Martian year is equal to 1.8809 Earth years, or 1 year, 320 days, and 18.2 hours. The gravitational potential difference and thus the delta-v needed to transfer between Mars and Earth is the second lowest for Earth. The axial tilt of Mars is 25.19° relative to its orbital plane, which is similar to the axial tilt of Earth. As a result, Mars has seasons like Earth, though on Mars they are nearly twice as long because its orbital period is that much longer. In the present day, the orientation of the north pole of Mars is close to the star Deneb. Mars has a relatively pronounced orbital eccentricity of about 0.09; of the seven other planets in the Solar System, only Mercury has a larger orbital eccentricity. It is known that in the past, Mars has had a much more circular orbit. At one point, 1.35 million Earth years ago, Mars had an eccentricity of roughly 0.002, much less than that of Earth today. Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years. Mars has its closest approach to Earth (opposition) in a synodic period of 779.94 days. It should not be confused with Mars conjunction, where the Earth and Mars are at opposite sides of the Solar System and form a straight line crossing the Sun. The average time between the successive oppositions of Mars, its synodic period, is 780 days; but the number of days between successive oppositions can range from 764 to 812. The distance at close approach varies between about 54 and 103 million km (34 and 64 million mi) due to the planets' elliptical orbits, which causes comparable variation in angular size. At their furthest Mars and Earth can be as far as 401 million km (249 million mi) apart. Mars comes into opposition from Earth every 2.1 years. The planets come into opposition near Mars's perihelion in 2003, 2018 and 2035, with the 2020 and 2033 events being particularly close to perihelic opposition. The mean apparent magnitude of Mars is +0.71 with a standard deviation of 1.05. Because the orbit of Mars is eccentric, the magnitude at opposition from the Sun can range from about −3.0 to −1.4. The minimum brightness is magnitude +1.86 when the planet is near aphelion and in conjunction with the Sun. At its brightest, Mars (along with Jupiter) is second only to Venus in apparent brightness. Mars usually appears distinctly yellow, orange, or red. When farthest away from Earth, it is more than seven times farther away than when it is closest. Mars is usually close enough for particularly good viewing once or twice at 15-year or 17-year intervals. Optical ground-based telescopes are typically limited to resolving features about 300 kilometres (190 mi) across when Earth and Mars are closest because of Earth's atmosphere. As Mars approaches opposition, it begins a period of retrograde motion, which means it will appear to move backwards in a looping curve with respect to the background stars. This retrograde motion lasts for about 72 days, and Mars reaches its peak apparent brightness in the middle of this interval. Moons Mars has two relatively small (compared to Earth's) natural moons, Phobos (about 22 km (14 mi) in diameter) and Deimos (about 12 km (7.5 mi) in diameter), which orbit at 9,376 km (5,826 mi) and 23,460 km (14,580 mi) around the planet. The origin of both moons is unclear, although a popular theory states that they were asteroids captured into Martian orbit. Both satellites were discovered in 1877 by Asaph Hall and were named after the characters Phobos (the deity of panic and fear) and Deimos (the deity of terror and dread), twins from Greek mythology who accompanied their father Ares, god of war, into battle. Mars was the Roman equivalent to Ares. In modern Greek, the planet retains its ancient name Ares (Aris: Άρης). From the surface of Mars, the motions of Phobos and Deimos appear different from that of the Earth's satellite, the Moon. Phobos rises in the west, sets in the east, and rises again in just 11 hours. Deimos, being only just outside synchronous orbit – where the orbital period would match the planet's period of rotation – rises as expected in the east, but slowly. Because the orbit of Phobos is below a synchronous altitude, tidal forces from Mars are gradually lowering its orbit. In about 50 million years, it could either crash into Mars's surface or break up into a ring structure around the planet. The origin of the two satellites is not well understood. Their low albedo and carbonaceous chondrite composition have been regarded as similar to asteroids, supporting a capture theory. The unstable orbit of Phobos would seem to point toward a relatively recent capture. But both have circular orbits near the equator, which is unusual for captured objects, and the required capture dynamics are complex. Accretion early in the history of Mars is plausible, but would not account for a composition resembling asteroids rather than Mars itself, if that is confirmed. Mars may have yet-undiscovered moons, smaller than 50 to 100 metres (160 to 330 ft) in diameter, and a dust ring is predicted to exist between Phobos and Deimos. A third possibility for their origin as satellites of Mars is the involvement of a third body or a type of impact disruption. More-recent lines of evidence for Phobos having a highly porous interior, and suggesting a composition containing mainly phyllosilicates and other minerals known from Mars, point toward an origin of Phobos from material ejected by an impact on Mars that reaccreted in Martian orbit, similar to the prevailing theory for the origin of Earth's satellite. Although the visible and near-infrared (VNIR) spectra of the moons of Mars resemble those of outer-belt asteroids, the thermal infrared spectra of Phobos are reported to be inconsistent with chondrites of any class. It is also possible that Phobos and Deimos were fragments of an older moon, formed by debris from a large impact on Mars, and then destroyed by a more recent impact upon the satellite. More recently, a study conducted by a team of researchers from multiple countries suggests that a lost moon, at least fifteen times the size of Phobos, may have existed in the past. By analyzing rocks which point to tidal processes on the planet, it is possible that these tides may have been regulated by a past moon. Human observations and exploration The history of observations of Mars is marked by oppositions of Mars when the planet is closest to Earth and hence is most easily visible, which occur every couple of years. Even more notable are the perihelic oppositions of Mars, which are distinguished because Mars is close to perihelion, making it even closer to Earth. The ancient Sumerians named Mars Nergal, the god of war and plague. During Sumerian times, Nergal was a minor deity of little significance, but, during later times, his main cult center was the city of Nineveh. In Mesopotamian texts, Mars is referred to as the "star of judgement of the fate of the dead". The existence of Mars as a wandering object in the night sky was also recorded by the ancient Egyptian astronomers and, by 1534 BCE, they were familiar with the retrograde motion of the planet. By the period of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets and systematic observations of their behavior. For Mars, they knew that the planet made 37 synodic periods, or 42 circuits of the zodiac, every 79 years. They invented arithmetic methods for making minor corrections to the predicted positions of the planets. In Ancient Greece, the planet was known as Πυρόεις. Commonly, the Greek name for the planet now referred to as Mars, was Ares. It was the Romans who named the planet Mars, for their god of war, often represented by the sword and shield of the planet's namesake. In the fourth century BCE, Aristotle noted that Mars disappeared behind the Moon during an occultation, indicating that the planet was farther away. Ptolemy, a Greek living in Alexandria, attempted to address the problem of the orbital motion of Mars. Ptolemy's model and his collective work on astronomy was presented in the multi-volume collection later called the Almagest (from the Arabic for "greatest"), which became the authoritative treatise on Western astronomy for the next fourteen centuries. Literature from ancient China confirms that Mars was known by Chinese astronomers by no later than the fourth century BCE. In the East Asian cultures, Mars is traditionally referred to as the "fire star" (火星) based on the Wuxing system. In 1609 Johannes Kepler published a 10 year study of Martian orbit, using the diurnal parallax of Mars, measured by Tycho Brahe, to make a preliminary calculation of the relative distance to the planet. From Brahe's observations of Mars, Kepler deduced that the planet orbited the Sun not in a circle, but in an ellipse. Moreover, Kepler showed that Mars sped up as it approached the Sun and slowed down as it moved farther away, in a manner that later physicists would explain as a consequence of the conservation of angular momentum.: 433–437 In 1610 the first use of a telescope for astronomical observation, including Mars, was performed by Italian astronomer Galileo Galilei. With the telescope the diurnal parallax of Mars was again measured in an effort to determine the Sun-Earth distance. This was first performed by Giovanni Domenico Cassini in 1672. The early parallax measurements were hampered by the quality of the instruments. The only occultation of Mars by Venus observed was that of 13 October 1590, seen by Michael Maestlin at Heidelberg. By the 19th century, the resolution of telescopes reached a level sufficient for surface features to be identified. On 5 September 1877, a perihelic opposition to Mars occurred. The Italian astronomer Giovanni Schiaparelli used a 22-centimetre (8.7 in) telescope in Milan to help produce the first detailed map of Mars. These maps notably contained features he called canali, which, with the possible exception of the natural canyon Valles Marineris, were later shown to be an optical illusion. These canali were supposedly long, straight lines on the surface of Mars, to which he gave names of famous rivers on Earth. His term, which means "channels" or "grooves", was popularly mistranslated in English as "canals". Influenced by the observations, the orientalist Percival Lowell founded an observatory which had 30- and 45-centimetre (12- and 18-in) telescopes. The observatory was used for the exploration of Mars during the last good opportunity in 1894, and the following less favorable oppositions. He published several books on Mars and life on the planet, which had a great influence on the public. The canali were independently observed by other astronomers, like Henri Joseph Perrotin and Louis Thollon in Nice, using one of the largest telescopes of that time. The seasonal changes (consisting of the diminishing of the polar caps and the dark areas formed during Martian summers) in combination with the canals led to speculation about life on Mars, and it was a long-held belief that Mars contained vast seas and vegetation. As bigger telescopes were used, fewer long, straight canali were observed. During observations in 1909 by Antoniadi with an 84-centimetre (33 in) telescope, irregular patterns were observed, but no canali were seen. The first spacecraft from Earth to visit Mars was Mars 1 of the Soviet Union, which flew by in 1963, but contact was lost en route. NASA's Mariner 4 followed and became the first spacecraft to successfully transmit from Mars; launched on 28 November 1964, it made its closest approach to the planet on 15 July 1965. Mariner 4 detected the weak Martian radiation belt, measured at about 0.1% that of Earth, and captured the first images of another planet from deep space. Once spacecraft visited the planet during the 1960s and 1970s, many previous concepts of Mars were radically broken. After the results of the Viking life-detection experiments, the hypothesis of a dead planet was generally accepted. The data from Mariner 9 and Viking allowed better maps of Mars to be made. Until 1997 and after Viking 1 shut down in 1982, Mars was only visited by three unsuccessful probes, two flying past without contact (Phobos 1, 1988; Mars Observer, 1993), and one (Phobos 2 1989) malfunctioning in orbit before reaching its destination Phobos. In 1997 Mars Pathfinder became the first successful rover mission beyond the Moon and started together with Mars Global Surveyor (operated until late 2006) an uninterrupted active robotic presence at Mars that has lasted until today. It produced complete, extremely detailed maps of the Martian topography, magnetic field and surface minerals. Starting with these missions a range of new improved crewless spacecraft, including orbiters, landers, and rovers, have been sent to Mars, with successful missions by the NASA (United States), Jaxa (Japan), ESA, United Kingdom, ISRO (India), Roscosmos (Russia), the United Arab Emirates, and CNSA (China) to study the planet's surface, climate, and geology, uncovering the different elements of the history and dynamic of the hydrosphere of Mars and possible traces of ancient life. As of 2023[update], Mars is host to ten functioning spacecraft. Eight are in orbit: 2001 Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, MAVEN, ExoMars Trace Gas Orbiter, the Hope orbiter, and the Tianwen-1 orbiter. Another two are on the surface: the Mars Science Laboratory Curiosity rover and the Perseverance rover. Collected maps are available online at websites including Google Mars. NASA provides two online tools: Mars Trek, which provides visualizations of the planet using data from 50 years of exploration, and Experience Curiosity, which simulates traveling on Mars in 3-D with Curiosity. Planned missions to Mars include: As of February 2024[update], debris from these types of missions has reached over seven tons. Most of it consists of crashed and inactive spacecraft as well as discarded components. In April 2024, NASA selected several companies to begin studies on providing commercial services to further enable robotic science on Mars. Key areas include establishing telecommunications, payload delivery and surface imaging. Habitability and habitation During the late 19th century, it was widely accepted in the astronomical community that Mars had life-supporting qualities, including the presence of oxygen and water. However, in 1894 W. W. Campbell at Lick Observatory observed the planet and found that "if water vapor or oxygen occur in the atmosphere of Mars it is in quantities too small to be detected by spectroscopes then available". That observation contradicted many of the measurements of the time and was not widely accepted. Campbell and V. M. Slipher repeated the study in 1909 using better instruments, but with the same results. It was not until the findings were confirmed by W. S. Adams in 1925 that the myth of the Earth-like habitability of Mars was finally broken. However, even in the 1960s, articles were published on Martian biology, putting aside explanations other than life for the seasonal changes on Mars. The current understanding of planetary habitability – the ability of a world to develop environmental conditions favorable to the emergence of life – favors planets that have liquid water on their surface. Most often this requires the orbit of a planet to lie within the habitable zone, which for the Sun is estimated to extend from within the orbit of Earth to about that of Mars. During perihelion, Mars dips inside this region, but Mars's thin (low-pressure) atmosphere prevents liquid water from existing over large regions for extended periods. The past flow of liquid water demonstrates the planet's potential for habitability. Recent evidence has suggested that any water on the Martian surface may have been too salty and acidic to support regular terrestrial life. The environmental conditions on Mars are a challenge to sustaining organic life: the planet has little heat transfer across its surface, it has poor insulation against bombardment by the solar wind due to the absence of a magnetosphere and has insufficient atmospheric pressure to retain water in a liquid form (water instead sublimes to a gaseous state). Mars is nearly, or perhaps totally, geologically dead; the end of volcanic activity has apparently stopped the recycling of chemicals and minerals between the surface and interior of the planet. Evidence suggests that the planet was once significantly more habitable than it is today, but whether living organisms ever existed there remains unknown. The Viking probes of the mid-1970s carried experiments designed to detect microorganisms in Martian soil at their respective landing sites and had positive results, including a temporary increase in CO2 production on exposure to water and nutrients. This sign of life was later disputed by scientists, resulting in a continuing debate, with NASA scientist Gilbert Levin asserting that Viking may have found life. A 2014 analysis of Martian meteorite EETA79001 found chlorate, perchlorate, and nitrate ions in sufficiently high concentrations to suggest that they are widespread on Mars. UV and X-ray radiation would turn chlorate and perchlorate ions into other, highly reactive oxychlorines, indicating that any organic molecules would have to be buried under the surface to survive. Small quantities of methane and formaldehyde detected by Mars orbiters are both claimed to be possible evidence for life, as these chemical compounds would quickly break down in the Martian atmosphere. Alternatively, these compounds may instead be replenished by volcanic or other geological means, such as serpentinite. Impact glass, formed by the impact of meteors, which on Earth can preserve signs of life, has also been found on the surface of the impact craters on Mars. Likewise, the glass in impact craters on Mars could have preserved signs of life, if life existed at the site. The Cheyava Falls rock discovered on Mars in June 2024 has been designated by NASA as a "potential biosignature" and was core sampled by the Perseverance rover for possible return to Earth and further examination. Although highly intriguing, no definitive final determination on a biological or abiotic origin of this rock can be made with the data currently available. Several plans for a human mission to Mars have been proposed, but none have come to fruition. The NASA Authorization Act of 2017 directed NASA to study the feasibility of a crewed Mars mission in the early 2030s; the resulting report concluded that this would be unfeasible. In addition, in 2021, China was planning to send a crewed Mars mission in 2033. Privately held companies such as SpaceX have also proposed plans to send humans to Mars, with the eventual goal to settle on the planet. As of 2024, SpaceX has proceeded with the development of the Starship launch vehicle with the goal of Mars colonization. In plans shared with the company in April 2024, Elon Musk envisions the beginning of a Mars colony within the next twenty years. This would be enabled by the planned mass manufacturing of Starship and initially sustained by resupply from Earth, and in situ resource utilization on Mars, until the Mars colony reaches full self sustainability. Any future human mission to Mars will likely take place within the optimal Mars launch window, which occurs every 26 months. The moon Phobos has been proposed as an anchor point for a space elevator. Besides national space agencies and space companies, groups such as the Mars Society and The Planetary Society advocate for human missions to Mars. In culture Mars is named after the Roman god of war (Greek Ares), but was also associated with the demi-god Heracles (Roman Hercules) by ancient Greek astronomers, as detailed by Aristotle. This association between Mars and war dates back at least to Babylonian astronomy, in which the planet was named for the god Nergal, deity of war and destruction. It persisted into modern times, as exemplified by Gustav Holst's orchestral suite The Planets, whose famous first movement labels Mars "The Bringer of War". The planet's symbol, a circle with a spear pointing out to the upper right, is also used as a symbol for the male gender. The symbol dates from at least the 11th century, though a possible predecessor has been found in the Greek Oxyrhynchus Papyri. The idea that Mars was populated by intelligent Martians became widespread in the late 19th century. Schiaparelli's "canali" observations combined with Percival Lowell's books on the subject put forward the standard notion of a planet that was a drying, cooling, dying world with ancient civilizations constructing irrigation works. Many other observations and proclamations by notable personalities added to what has been termed "Mars Fever". In the present day, high-resolution mapping of the surface of Mars has revealed no artifacts of habitation, but pseudoscientific speculation about intelligent life on Mars still continues. Reminiscent of the canali observations, these speculations are based on small scale features perceived in the spacecraft images, such as "pyramids" and the "Face on Mars". In his book Cosmos, planetary astronomer Carl Sagan wrote: "Mars has become a kind of mythic arena onto which we have projected our Earthly hopes and fears." The depiction of Mars in fiction has been stimulated by its dramatic red color and by nineteenth-century scientific speculations that its surface conditions might support not just life but intelligent life. This gave way to many science fiction stories involving these concepts, such as H. G. Wells's The War of the Worlds, in which Martians seek to escape their dying planet by invading Earth; Ray Bradbury's The Martian Chronicles, in which human explorers accidentally destroy a Martian civilization; as well as Edgar Rice Burroughs's series Barsoom, C. S. Lewis's novel Out of the Silent Planet (1938), and a number of Robert A. Heinlein stories before the mid-sixties. Since then, depictions of Martians have also extended to animation. A comic figure of an intelligent Martian, Marvin the Martian, appeared in Haredevil Hare (1948) as a character in the Looney Tunes animated cartoons of Warner Brothers, and has continued as part of popular culture to the present. After the Mariner and Viking spacecraft had returned pictures of Mars as a lifeless and canal-less world, these ideas about Mars were abandoned; for many science-fiction authors, the new discoveries initially seemed like a constraint, but eventually the post-Viking knowledge of Mars became itself a source of inspiration for works like Kim Stanley Robinson's Mars trilogy. See also Notes References Further reading External links Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Local Volume → Virgo Supercluster → Laniakea Supercluster → Pisces–Cetus Supercluster Complex → Local Hole → Observable universe → UniverseEach arrow (→) may be read as "within" or "part of". |
======================================== |
[SOURCE: https://www.wired.com/search/] | [TOKENS: 86] |
Search stories from WIRED 10,000+ results from WIRED © 2026 Condé Nast. All rights reserved. WIRED may earn a portion of sales from products that are purchased through our site as part of our Affiliate Partnerships with retailers. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Condé Nast. Ad Choices |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Elon_Musk#cite_ref-Eligon-2022_2-1] | [TOKENS: 10515] |
Contents Elon Musk Elon Reeve Musk (/ˈiːlɒn/ EE-lon; born June 28, 1971) is a businessman and entrepreneur known for his leadership of Tesla, SpaceX, Twitter, and xAI. Musk has been the wealthiest person in the world since 2025; as of February 2026,[update] Forbes estimates his net worth to be around US$852 billion. Born into a wealthy family in Pretoria, South Africa, Musk emigrated in 1989 to Canada; he has Canadian citizenship since his mother was born there. He received bachelor's degrees in 1997 from the University of Pennsylvania before moving to California to pursue business ventures. In 1995, Musk co-founded the software company Zip2. Following its sale in 1999, he co-founded X.com, an online payment company that later merged to form PayPal, which was acquired by eBay in 2002. Musk also became an American citizen in 2002. In 2002, Musk founded the space technology company SpaceX, becoming its CEO and chief engineer; the company has since led innovations in reusable rockets and commercial spaceflight. Musk joined the automaker Tesla as an early investor in 2004 and became its CEO and product architect in 2008; it has since become a leader in electric vehicles. In 2015, he co-founded OpenAI to advance artificial intelligence (AI) research, but later left; growing discontent with the organization's direction and their leadership in the AI boom in the 2020s led him to establish xAI, which became a subsidiary of SpaceX in 2026. In 2022, he acquired the social network Twitter, implementing significant changes, and rebranding it as X in 2023. His other businesses include the neurotechnology company Neuralink, which he co-founded in 2016, and the tunneling company the Boring Company, which he founded in 2017. In November 2025, a Tesla pay package worth $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Musk was the largest donor in the 2024 U.S. presidential election, where he supported Donald Trump. After Trump was inaugurated as president in early 2025, Musk served as Senior Advisor to the President and as the de facto head of the Department of Government Efficiency (DOGE). After a public feud with Trump, Musk left the Trump administration and returned to managing his companies. Musk is a supporter of global far-right figures, causes, and political parties. His political activities, views, and statements have made him a polarizing figure. Musk has been criticized for COVID-19 misinformation, promoting conspiracy theories, and affirming antisemitic, racist, and transphobic comments. His acquisition of Twitter was controversial due to a subsequent increase in hate speech and the spread of misinformation on the service, following his pledge to decrease censorship. His role in the second Trump administration attracted public backlash, particularly in response to DOGE. The emails he sent to Jeffrey Epstein are included in the Epstein files, which were published between 2025–26 and became a topic of worldwide debate. Early life Elon Reeve Musk was born on June 28, 1971, in Pretoria, South Africa's administrative capital. He is of British and Pennsylvania Dutch ancestry. His mother, Maye (née Haldeman), is a model and dietitian born in Saskatchewan, Canada, and raised in South Africa. Musk therefore holds both South African and Canadian citizenship from birth. His father, Errol Musk, is a South African electromechanical engineer, pilot, sailor, consultant, emerald dealer, and property developer, who partly owned a rental lodge at Timbavati Private Nature Reserve. His maternal grandfather, Joshua N. Haldeman, who died in a plane crash when Elon was a toddler, was an American-born Canadian chiropractor, aviator and political activist in the technocracy movement who moved to South Africa in 1950. Elon has a younger brother, Kimbal, a younger sister, Tosca, and four paternal half-siblings. Musk was baptized as a child in the Anglican Church of Southern Africa. Despite both Elon and Errol previously stating that Errol was a part owner of a Zambian emerald mine, in 2023, Errol recounted that the deal he made was to receive "a portion of the emeralds produced at three small mines". Errol was elected to the Pretoria City Council as a representative of the anti-apartheid Progressive Party and has said that his children shared their father's dislike of apartheid. After his parents divorced in 1979, Elon, aged around 9, chose to live with his father because Errol Musk had an Encyclopædia Britannica and a computer. Elon later regretted his decision and became estranged from his father. Elon has recounted trips to a wilderness school that he described as a "paramilitary Lord of the Flies" where "bullying was a virtue" and children were encouraged to fight over rations. In one incident, after an altercation with a fellow pupil, Elon was thrown down concrete steps and beaten severely, leading to him being hospitalized for his injuries. Elon described his father berating him after he was discharged from the hospital. Errol denied berating Elon and claimed, "The [other] boy had just lost his father to suicide, and Elon had called him stupid. Elon had a tendency to call people stupid. How could I possibly blame that child?" Elon was an enthusiastic reader of books, and had attributed his success in part to having read The Lord of the Rings, the Foundation series, and The Hitchhiker's Guide to the Galaxy. At age ten, he developed an interest in computing and video games, teaching himself how to program from the VIC-20 user manual. At age twelve, Elon sold his BASIC-based game Blastar to PC and Office Technology magazine for approximately $500 (equivalent to $1,600 in 2025). Musk attended Waterkloof House Preparatory School, Bryanston High School, and then Pretoria Boys High School, where he graduated. Musk was a decent but unexceptional student, earning a 61/100 in Afrikaans and a B on his senior math certification. Musk applied for a Canadian passport through his Canadian-born mother to avoid South Africa's mandatory military service, which would have forced him to participate in the apartheid regime, as well as to ease his path to immigration to the United States. While waiting for his application to be processed, he attended the University of Pretoria for five months. Musk arrived in Canada in June 1989, connected with a second cousin in Saskatchewan, and worked odd jobs, including at a farm and a lumber mill. In 1990, he entered Queen's University in Kingston, Ontario. Two years later, he transferred to the University of Pennsylvania, where he studied until 1995. Although Musk has said that he earned his degrees in 1995, the University of Pennsylvania did not award them until 1997 – a Bachelor of Arts in physics and a Bachelor of Science in economics from the university's Wharton School. He reportedly hosted large, ticketed house parties to help pay for tuition, and wrote a business plan for an electronic book-scanning service similar to Google Books. In 1994, Musk held two internships in Silicon Valley: one at energy storage startup Pinnacle Research Institute, which investigated electrolytic supercapacitors for energy storage, and another at Palo Alto–based startup Rocket Science Games. In 1995, he was accepted to a graduate program in materials science at Stanford University, but did not enroll. Musk decided to join the Internet boom of the 1990s, applying for a job at Netscape, to which he reportedly never received a response. The Washington Post reported that Musk lacked legal authorization to remain and work in the United States after failing to enroll at Stanford. In response, Musk said he was allowed to work at that time and that his student visa transitioned to an H1-B. According to numerous former business associates and shareholders, Musk said he was on a student visa at the time. Business career In 1995, Musk, his brother Kimbal, and Greg Kouri founded the web software company Zip2 with funding from a group of angel investors. They housed the venture at a small rented office in Palo Alto. Replying to Rolling Stone, Musk denounced the notion that they started their company with funds borrowed from Errol Musk, but in a tweet, he recognized that his father contributed 10% of a later funding round. The company developed and marketed an Internet city guide for the newspaper publishing industry, with maps, directions, and yellow pages. According to Musk, "The website was up during the day and I was coding it at night, seven days a week, all the time." To impress investors, Musk built a large plastic structure around a standard computer to create the impression that Zip2 was powered by a small supercomputer. The Musk brothers obtained contracts with The New York Times and the Chicago Tribune, and persuaded the board of directors to abandon plans for a merger with CitySearch. Musk's attempts to become CEO were thwarted by the board. Compaq acquired Zip2 for $307 million in cash in February 1999 (equivalent to $590,000,000 in 2025), and Musk received $22 million (equivalent to $43,000,000 in 2025) for his 7-percent share. In 1999, Musk co-founded X.com, an online financial services and e-mail payment company. The startup was one of the first federally insured online banks, and, in its initial months of operation, over 200,000 customers joined the service. The company's investors regarded Musk as inexperienced and replaced him with Intuit CEO Bill Harris by the end of the year. The following year, X.com merged with online bank Confinity to avoid competition. Founded by Max Levchin and Peter Thiel, Confinity had its own money-transfer service, PayPal, which was more popular than X.com's service. Within the merged company, Musk returned as CEO. Musk's preference for Microsoft software over Unix created a rift in the company and caused Thiel to resign. Due to resulting technological issues and lack of a cohesive business model, the board ousted Musk and replaced him with Thiel in 2000.[b] Under Thiel, the company focused on the PayPal service and was renamed PayPal in 2001. In 2002, PayPal was acquired by eBay for $1.5 billion (equivalent to $2,700,000,000 in 2025) in stock, of which Musk—the largest shareholder with 11.72% of shares—received $175.8 million (equivalent to $320,000,000 in 2025). In 2017, Musk purchased the domain X.com from PayPal for an undisclosed amount, stating that it had sentimental value. In 2001, Musk became involved with the nonprofit Mars Society and discussed funding plans to place a growth-chamber for plants on Mars. Seeking a way to launch the greenhouse payloads into space, Musk made two unsuccessful trips to Moscow to purchase intercontinental ballistic missiles (ICBMs) from Russian companies NPO Lavochkin and Kosmotras. Musk instead decided to start a company to build affordable rockets. With $100 million of his early fortune, (equivalent to $180,000,000 in 2025) Musk founded SpaceX in May 2002 and became the company's CEO and Chief Engineer. SpaceX attempted its first launch of the Falcon 1 rocket in 2006. Although the rocket failed to reach Earth orbit, it was awarded a Commercial Orbital Transportation Services program contract from NASA, then led by Mike Griffin. After two more failed attempts that nearly caused Musk to go bankrupt, SpaceX succeeded in launching the Falcon 1 into orbit in 2008. Later that year, SpaceX received a $1.6 billion NASA contract (equivalent to $2,400,000,000 in 2025) for Falcon 9-launched Dragon spacecraft flights to the International Space Station (ISS), replacing the Space Shuttle after its 2011 retirement. In 2012, the Dragon vehicle docked with the ISS, a first for a commercial spacecraft. Working towards its goal of reusable rockets, in 2015 SpaceX successfully landed the first stage of a Falcon 9 on a land platform. Later landings were achieved on autonomous spaceport drone ships, an ocean-based recovery platform. In 2018, SpaceX launched the Falcon Heavy; the inaugural mission carried Musk's personal Tesla Roadster as a dummy payload. Since 2019, SpaceX has been developing Starship, a reusable, super heavy-lift launch vehicle intended to replace the Falcon 9 and Falcon Heavy. In 2020, SpaceX launched its first crewed flight, the Demo-2, becoming the first private company to place astronauts into orbit and dock a crewed spacecraft with the ISS. In 2024, NASA awarded SpaceX an $843 million (equivalent to $865,000,000 in 2025) contract to build a spacecraft that NASA will use to deorbit the ISS at the end of its lifespan. In 2015, SpaceX began development of the Starlink constellation of low Earth orbit satellites to provide satellite Internet access. After the launch of prototype satellites in 2018, the first large constellation was deployed in May 2019. As of May 2025[update], over 7,600 Starlink satellites are operational, comprising 65% of all operational Earth satellites. The total cost of the decade-long project to design, build, and deploy the constellation was estimated by SpaceX in 2020 to be $10 billion (equivalent to $12,000,000,000 in 2025).[c] During the Russian invasion of Ukraine, Musk provided free Starlink service to Ukraine, permitting Internet access and communication at a yearly cost to SpaceX of $400 million (equivalent to $440,000,000 in 2025). However, Musk refused to block Russian state media on Starlink. In 2023, Musk denied Ukraine's request to activate Starlink over Crimea to aid an attack against the Russian navy, citing fears of a nuclear response. Tesla, Inc., originally Tesla Motors, was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning. Both men played active roles in the company's early development prior to Musk's involvement. Musk led the Series A round of investment in February 2004; he invested $6.35 million (equivalent to $11,000,000 in 2025), became the majority shareholder, and joined Tesla's board of directors as chairman. Musk took an active role within the company and oversaw Roadster product design, but was not deeply involved in day-to-day business operations. Following a series of escalating conflicts in 2007 and the 2008 financial crisis, Eberhard was ousted from the firm.[page needed] Musk assumed leadership of the company as CEO and product architect in 2008. A 2009 lawsuit settlement with Eberhard designated Musk as a Tesla co-founder, along with Tarpenning and two others. Tesla began delivery of the Roadster, an electric sports car, in 2008. With sales of about 2,500 vehicles, it was the first mass production all-electric car to use lithium-ion battery cells. Under Musk, Tesla has since launched several well-selling electric vehicles, including the four-door sedan Model S (2012), the crossover Model X (2015), the mass-market sedan Model 3 (2017), the crossover Model Y (2020), and the pickup truck Cybertruck (2023). In May 2020, Musk resigned as chairman of the board as part of the settlement of a lawsuit from the SEC over him tweeting that funding had been "secured" for potentially taking Tesla private. The company has also constructed multiple lithium-ion battery and electric vehicle factories, called Gigafactories. Since its initial public offering in 2010, Tesla stock has risen significantly; it became the most valuable carmaker in summer 2020, and it entered the S&P 500 later that year. In October 2021, it reached a market capitalization of $1 trillion (equivalent to $1,200,000,000,000 in 2025), the sixth company in U.S. history to do so. Musk provided the initial concept and financial capital for SolarCity, which his cousins Lyndon and Peter Rive founded in 2006. By 2013, SolarCity was the second largest provider of solar power systems in the United States. In 2014, Musk promoted the idea of SolarCity building an advanced production facility in Buffalo, New York, triple the size of the largest solar plant in the United States. Construction of the factory started in 2014 and was completed in 2017. It operated as a joint venture with Panasonic until early 2020. Tesla acquired SolarCity for $2 billion in 2016 (equivalent to $2,700,000,000 in 2025) and merged it with its battery unit to create Tesla Energy. The deal's announcement resulted in a more than 10% drop in Tesla's stock price; at the time, SolarCity was facing liquidity issues. Multiple shareholder groups filed a lawsuit against Musk and Tesla's directors, stating that the purchase of SolarCity was done solely to benefit Musk and came at the expense of Tesla and its shareholders. Tesla directors settled the lawsuit in January 2020, leaving Musk the sole remaining defendant. Two years later, the court ruled in Musk's favor. In 2016, Musk co-founded Neuralink, a neurotechnology startup, with an investment of $100 million. Neuralink aims to integrate the human brain with artificial intelligence (AI) by creating devices that are embedded in the brain. Such technology could enhance memory or allow the devices to communicate with software. The company also hopes to develop devices to treat neurological conditions like spinal cord injuries. In 2022, Neuralink announced that clinical trials would begin by the end of the year. In September 2023, the Food and Drug Administration approved Neuralink to initiate six-year human trials. Neuralink has conducted animal testing on macaques at the University of California, Davis. In 2021, the company released a video in which a macaque played the video game Pong via a Neuralink implant. The company's animal trials—which have caused the deaths of some monkeys—have led to claims of animal cruelty. The Physicians Committee for Responsible Medicine has alleged that Neuralink violated the Animal Welfare Act. Employees have complained that pressure from Musk to accelerate development has led to botched experiments and unnecessary animal deaths. In 2022, a federal probe was launched into possible animal welfare violations by Neuralink.[needs update] In 2017, Musk founded the Boring Company to construct tunnels; he also revealed plans for specialized, underground, high-occupancy vehicles that could travel up to 150 miles per hour (240 km/h) and thus circumvent above-ground traffic in major cities. Early in 2017, the company began discussions with regulatory bodies and initiated construction of a 30-foot (9.1 m) wide, 50-foot (15 m) long, and 15-foot (4.6 m) deep "test trench" on the premises of SpaceX's offices, as that required no permits. The Los Angeles tunnel, less than two miles (3.2 km) in length, debuted to journalists in 2018. It used Tesla Model Xs and was reported to be a rough ride while traveling at suboptimal speeds. Two tunnel projects announced in 2018, in Chicago and West Los Angeles, have been canceled. A tunnel beneath the Las Vegas Convention Center was completed in early 2021. Local officials have approved further expansions of the tunnel system. April 14, 2022 In early 2017, Musk expressed interest in buying Twitter and had questioned the platform's commitment to freedom of speech. By 2022, Musk had reached 9.2% stake in the company, making him the largest shareholder.[d] Musk later agreed to a deal that would appoint him to Twitter's board of directors and prohibit him from acquiring more than 14.9% of the company. Days later, Musk made a $43 billion offer to buy Twitter. By the end of April Musk had successfully concluded his bid for approximately $44 billion. This included approximately $12.5 billion in loans and $21 billion in equity financing. Having backtracked on his initial decision, Musk bought the company on October 27, 2022. Immediately after the acquisition, Musk fired several top Twitter executives including CEO Parag Agrawal; Musk became the CEO instead. Under Elon Musk, Twitter instituted monthly subscriptions for a "blue check", and laid off a significant portion of the company's staff. Musk lessened content moderation and hate speech also increased on the platform after his takeover. In late 2022, Musk released internal documents relating to Twitter's moderation of Hunter Biden's laptop controversy in the lead-up to the 2020 presidential election. Musk also promised to step down as CEO after a Twitter poll, and five months later, Musk stepped down as CEO and transitioned his role to executive chairman and chief technology officer (CTO). Despite Musk stepping down as CEO, X continues to struggle with challenges such as viral misinformation, hate speech, and antisemitism controversies. Musk has been accused of trying to silence some of his critics such as Twitch streamer Asmongold, who criticized him during one of his streams. Musk has been accused of removing their accounts' blue checkmarks, which hinders visibility and is considered a form of shadow banning, or suspending their accounts without justification. Other activities In August 2013, Musk announced plans for a version of a vactrain, and assigned engineers from SpaceX and Tesla to design a transport system between Greater Los Angeles and the San Francisco Bay Area, at an estimated cost of $6 billion. Later that year, Musk unveiled the concept, dubbed the Hyperloop, intended to make travel cheaper than any other mode of transport for such long distances. In December 2015, Musk co-founded OpenAI, a not-for-profit artificial intelligence (AI) research company aiming to develop artificial general intelligence, intended to be safe and beneficial to humanity. Musk pledged $1 billion of funding to the company, and initially gave $50 million. In 2018, Musk left the OpenAI board. Since 2018, OpenAI has made significant advances in machine learning. In July 2023, Musk launched the artificial intelligence company xAI, which aims to develop a generative AI program that competes with existing offerings like OpenAI's ChatGPT. Musk obtained funding from investors in SpaceX and Tesla, and xAI hired engineers from Google and OpenAI. December 16, 2022 Musk uses a private jet owned by Falcon Landing LLC, a SpaceX-linked company, and acquired a second jet in August 2020. His heavy use of the jets and the consequent fossil fuel usage have received criticism. Musk's flight usage is tracked on social media through ElonJet. In December 2022, Musk banned the ElonJet account on Twitter, and made temporary bans on the accounts of journalists that posted stories regarding the incident, including Donie O'Sullivan, Keith Olbermann, and journalists from The New York Times, The Washington Post, CNN, and The Intercept. In October 2025, Musk's company xAI launched Grokipedia, an AI-generated online encyclopedia that he promoted as an alternative to Wikipedia. Articles on Grokipedia are generated and reviewed by xAI's Grok chatbot. Media coverage and academic analysis described Grokipedia as frequently reusing Wikipedia content but framing contested political and social topics in line with Musk's own views and right-wing narratives. A study by Cornell University researchers and NBC News stated that Grokipedia cites sources that are blacklisted or considered "generally unreliable" on Wikipedia, for example, the conspiracy site Infowars and the neo-Nazi forum Stormfront. Wired, The Guardian and Time criticized Grokipedia for factual errors and for presenting Musk himself in unusually positive terms while downplaying controversies. Politics Musk is an outlier among business leaders who typically avoid partisan political advocacy. Musk was a registered independent voter when he lived in California. Historically, he has donated to both Democrats and Republicans, many of whom serve in states in which he has a vested interest. Since 2022, his political contributions have mostly supported Republicans, with his first vote for a Republican going to Mayra Flores in the 2022 Texas's 34th congressional district special election. In 2024, he started supporting international far-right political parties, activists, and causes, and has shared misinformation and numerous conspiracy theories. Since 2024, his views have been generally described as right-wing. Musk supported Barack Obama in 2008 and 2012, Hillary Clinton in 2016, Joe Biden in 2020, and Donald Trump in 2024. In the 2020 Democratic Party presidential primaries, Musk endorsed candidate Andrew Yang and expressed support for Yang's proposed universal basic income, and endorsed Kanye West's 2020 presidential campaign. In 2021, Musk publicly expressed opposition to the Build Back Better Act, a $3.5 trillion legislative package endorsed by Joe Biden that ultimately failed to pass due to unanimous opposition from congressional Republicans and several Democrats. In 2022, gave over $50 million to Citizens for Sanity, a conservative political action committee. In 2023, he supported Republican Ron DeSantis for the 2024 U.S. presidential election, giving $10 million to his campaign, and hosted DeSantis's campaign announcement on a Twitter Spaces event. From June 2023 to January 2024, Musk hosted a bipartisan set of X Spaces with Republican and Democratic candidates, including Robert F. Kennedy Jr., Vivek Ramaswamy, and Dean Phillips. In October 2025, former vice-president Kamala Harris commented that it was a mistake from the Democratic side to not invite Musk to a White House electric vehicle event organized in August 2021 and featuring executives from General Motors, Ford and Stellantis, despite Tesla being "the major American manufacturer of extraordinary innovation in this space." Fortune remarked that this was a nod to United Auto Workers and organized labor. Harris said presidents should put aside political loyalties when it came to recognizing innovation, and guessed that the non-invitation impacted Musk's perspective. Fortune noted that, at the time, Musk said, "Yeah, seems odd that Tesla wasn't invited." A month later, he criticized Biden as "not the friendliest administration." Jacob Silverman, author of the book Gilded Rage: Elon Musk and the Radicalization of Silicon Valley, said that the tech industry represented by Musk, Thiel, Andreessen and other capitalists, actually flourished under Biden, but the tech leaders chose Trump for their common ground on cultural issues. By early 2024, Musk had become a vocal and financial supporter of Donald Trump. In July 2024, minutes after the attempted assassination of Donald Trump, Musk endorsed him for president saying; "I fully endorse President Trump and hope for his rapid recovery." During the presidential campaign, Musk joined Trump on stage at a campaign rally, and during the campaign promoted conspiracy theories and falsehoods about Democrats, election fraud and immigration, in support of Trump. Musk was the largest individual donor of the 2024 election. In 2025, Musk contributed $19 million to the Wisconsin Supreme Court race, hoping to influence the state's future redistricting efforts and its regulations governing car manufacturers and dealers. In 2023, Musk said he shunned the World Economic Forum because it was boring. The organization commented that they had not invited him since 2015. He has participated in Dialog, dubbed "Tech Bilderberg" and organized by Peter Thiel and Auren Hoffman, though. Musk's international political actions and comments have come under increasing scrutiny and criticism, especially from the governments and leaders of France, Germany, Norway, Spain and the United Kingdom, particularly due to his position in the U.S. government as well as ownership of X. An NBC News analysis found he had boosted far-right political movements to cut immigration and curtail regulation of business in at least 18 countries on six continents since 2023. During his speech after the second inauguration of Donald Trump, Musk twice made a gesture interpreted by many as a Nazi or a fascist Roman salute.[e] He thumped his right hand over his heart, fingers spread wide, and then extended his right arm out, emphatically, at an upward angle, palm down and fingers together. He then repeated the gesture to the crowd behind him. As he finished the gestures, he said to the crowd, "My heart goes out to you. It is thanks to you that the future of civilization is assured." It was widely condemned as an intentional Nazi salute in Germany, where making such gestures is illegal. The Anti-Defamation League said it was not a Nazi salute, but other Jewish organizations disagreed and condemned the salute. American public opinion was divided on partisan lines as to whether it was a fascist salute. Musk dismissed the accusations of Nazi sympathies, deriding them as "dirty tricks" and a "tired" attack. Neo-Nazi and white supremacist groups celebrated it as a Nazi salute. Multiple European political parties demanded that Musk be banned from entering their countries. The concept of DOGE emerged in a discussion between Musk and Donald Trump, and in August 2024, Trump committed to giving Musk an advisory role, with Musk accepting the offer. In November and December 2024, Musk suggested that the organization could help to cut the U.S. federal budget, consolidate the number of federal agencies, and eliminate the Consumer Financial Protection Bureau, and that its final stage would be "deleting itself". In January 2025, the organization was created by executive order, and Musk was designated a "special government employee". Musk led the organization and was a senior advisor to the president, although his official role is not clear. In sworn statement during a lawsuit, the director of the White House Office of Administration stated that Musk "is not an employee of the U.S. DOGE Service or U.S. DOGE Service Temporary Organization", "is not the U.S. DOGE Service administrator", and has "no actual or formal authority to make government decisions himself". Trump said two days later that he had put Musk in charge of DOGE. A federal judge has ruled that Musk acted as the de facto leader of DOGE. Musk's role in the second Trump administration, particularly in response to DOGE, has attracted public backlash. He was criticized for his treatment of federal government employees, including his influence over the mass layoffs of the federal workforce. He has prioritized secrecy within the organization and has accused others of violating privacy laws. A Senate report alleged that Musk could avoid up to $2 billion in legal liability as a result of DOGE's actions. In May 2025, Bill Gates accused Musk of "killing the world's poorest children" through his cuts to USAID, which modeling by Boston University estimated had resulted in 300,000 deaths by this time, most of them of children. By November 2025, the estimated death toll had increased to 400,000 children and 200,000 adults. Musk announced on May 28, 2025, that he would depart from the Trump administration as planned when the special government employee's 130 day deadline expired, with a White House official confirming that Musk's offboarding from the Trump administration was already underway. His departure was officially confirmed during a joint Oval Office press conference with Trump on May 30, 2025. @realDonaldTrump is in the Epstein files. That is the real reason they have not been made public. June 5, 2025 After leaving office, Musk criticized the Trump administration's Big Beautiful Bill, calling it a "disgusting abomination" due to its provisions increasing the deficit. A feud began between Musk and Trump, with its most notable event being Musk alleging Trump had ties to sex offender Jeffrey Epstein on X (formerly Twitter) on June 5, 2025. Trump responded on Truth Social stating that Musk went "CRAZY" after the "EV Mandate" was purportedly taken away and threatened to cut Musk's government contracts. Musk then called for a third Trump impeachment. The next day, Trump stated that he did not wish to reconcile with Musk, and added that Musk would face "very serious consequences" if he funds Democratic candidates. On June 11, Musk publicly apologized for the tweets against Trump, saying they "went too far". Views November 6, 2022 Rejecting the conservative label, Musk has described himself as a political moderate, even as his views have become more right-wing over time. His views have been characterized as libertarian and far-right, and after his involvement in European politics, they have received criticism from world leaders such as Emmanuel Macron and Olaf Scholz. Within the context of American politics, Musk supported Democratic candidates up until 2022, at which point he voted for a Republican for the first time. He has stated support for universal basic income, gun rights, freedom of speech, a tax on carbon emissions, and H-1B visas. Musk has expressed concern about issues such as artificial intelligence (AI) and climate change, and has been a critic of wealth tax, short-selling, and government subsidies. An immigrant himself, Musk has been accused of being anti-immigration, and regularly blames immigration policies for illegal immigration. He is also a pronatalist who believes population decline is the biggest threat to civilization, and identifies as a cultural Christian. Musk has long been an advocate for space colonization, especially the colonization of Mars. He has repeatedly pushed for humanity colonizing Mars, in order to become an interplanetary species and lower the risks of human extinction. Musk has promoted conspiracy theories and made controversial statements that have led to accusations of racism, sexism, antisemitism, transphobia, disseminating disinformation, and support of white pride. While describing himself as a "pro-Semite", his comments regarding George Soros and Jewish communities have been condemned by the Anti-Defamation League and the Biden White House. Musk was criticized during the COVID-19 pandemic for making unfounded epidemiological claims, defying COVID-19 lockdowns restrictions, and supporting the Canada convoy protest against vaccine mandates. He has amplified false claims of white genocide in South Africa. Musk has been critical of Israel's actions in the Gaza Strip during the Gaza war, praised China's economic and climate goals, suggested that Taiwan and China should resolve cross-strait relations, and was described as having a close relationship with the Chinese government. In Europe, Musk expressed support for Ukraine in 2022 during the Russian invasion, recommended referendums and peace deals on the annexed Russia-occupied territories, and supported the far-right Alternative for Germany political party in 2024. Regarding British politics, Musk blamed the 2024 UK riots on mass migration and open borders, criticized Prime Minister Keir Starmer for what he described as a "two-tier" policing system, and was subsequently attacked as being responsible for spreading misinformation and amplifying the far-right. He has also voiced his support for far-right activist Tommy Robinson and pledged electoral support for Reform UK. In February 2026, Musk described Spanish Prime Minister Pedro Sánchez as a "tyrant" following Sánchez's proposal to prohibit minors under the age of 16 from accessing social media platforms. Legal affairs In 2018, Musk was sued by the U.S. Securities and Exchange Commission (SEC) for a tweet stating that funding had been secured for potentially taking Tesla private.[f] The securities fraud lawsuit characterized the tweet as false, misleading, and damaging to investors, and sought to bar Musk from serving as CEO of publicly traded companies. Two days later, Musk settled with the SEC, without admitting or denying the SEC's allegations. As a result, Musk and Tesla were fined $20 million each, and Musk was forced to step down for three years as Tesla chairman but was able to remain as CEO. Shareholders filed a lawsuit over the tweet, and in February 2023, a jury found Musk and Tesla not liable. Musk has stated in interviews that he does not regret posting the tweet that triggered the SEC investigation. In 2019, Musk stated in a tweet that Tesla would build half a million cars that year. The SEC reacted by asking a court to hold him in contempt for violating the terms of the 2018 settlement agreement. A joint agreement between Musk and the SEC eventually clarified the previous agreement details, including a list of topics about which Musk needed preclearance. In 2020, a judge blocked a lawsuit that claimed a tweet by Musk regarding Tesla stock price ("too high imo") violated the agreement. Freedom of Information Act (FOIA)-released records showed that the SEC concluded Musk had subsequently violated the agreement twice by tweeting regarding "Tesla's solar roof production volumes and its stock price". In October 2023, the SEC sued Musk over his refusal to testify a third time in an investigation into whether he violated federal law by purchasing Twitter stock in 2022. In February 2024, Judge Laurel Beeler ruled that Musk must testify again. In January 2025, the SEC filed a lawsuit against Musk for securities violations related to his purchase of Twitter. In January 2024, Delaware judge Kathaleen McCormick ruled in a 2018 lawsuit that Musk's $55 billion pay package from Tesla be rescinded. McCormick called the compensation granted by the company's board "an unfathomable sum" that was unfair to shareholders. The Delaware Supreme Court overturned McCormick's decision in December 2025, restoring Musk's compensation package and awarding $1 in nominal damages. Personal life Musk became a U.S. citizen in 2002. From the early 2000s until late 2020, Musk resided in California, where both Tesla and SpaceX were founded. He then relocated to Cameron County, Texas, saying that California had become "complacent" about its economic success. While hosting Saturday Night Live in 2021, Musk stated that he has Asperger syndrome (an outdated term for autism spectrum disorder). When asked about his experience growing up with Asperger's syndrome in a TED2022 conference in Vancouver, Musk stated that "the social cues were not intuitive ... I would just tend to take things very literally ... but then that turned out to be wrong — [people were not] simply saying exactly what they mean, there's all sorts of other things that are meant, and [it] took me a while to figure that out." Musk suffers from back pain and has undergone several spine-related surgeries, including a disc replacement. In 2000, he contracted a severe case of malaria while on vacation in South Africa. Musk has stated he uses doctor-prescribed ketamine for occasional depression and that he doses "a small amount once every other week or something like that"; since January 2024, some media outlets have reported that he takes ketamine, marijuana, LSD, ecstasy, mushrooms, cocaine and other drugs. Musk at first refused to comment on his alleged drug use, before responding that he had not tested positive for drugs, and that if drugs somehow improved his productivity, "I would definitely take them!". The New York Times' investigations revealed Musk's overuse of ketamine and numerous other drugs, as well as strained family relationships and concerns from close associates who have become troubled by his public behavior as he became more involved in political activities and government work. According to The Washington Post, President Trump described Musk as "a big-time drug addict". Through his own label Emo G Records, Musk released a rap track, "RIP Harambe", on SoundCloud in March 2019. The following year, he released an EDM track, "Don't Doubt Ur Vibe", featuring his own lyrics and vocals. Musk plays video games, which he stated has a "'restoring effect' that helps his 'mental calibration'". Some games he plays include Quake, Diablo IV, Elden Ring, and Polytopia. Musk once claimed to be one of the world's top video game players but has since admitted to "account boosting", or cheating by hiring outside services to achieve top player rankings. Musk has justified the boosting by claiming that all top accounts do it so he has to as well to remain competitive. In 2024 and 2025, Musk criticized the video game Assassin's Creed Shadows and its creator Ubisoft for "woke" content. Musk posted to X that "DEI kills art" and specified the inclusion of the historical figure Yasuke in the Assassin's Creed game as offensive; he also called the game "terrible". Ubisoft responded by saying that Musk's comments were "just feeding hatred" and that they were focused on producing a game not pushing politics. Musk has fathered at least 14 children, one of whom died as an infant. The Wall Street Journal reported in 2025 that sources close to Musk suggest that the "true number of Musk's children is much higher than publicly known". He had six children with his first wife, Canadian author Justine Wilson, whom he met while attending Queen's University in Ontario, Canada; they married in 2000. In 2002, their first child Nevada Musk died of sudden infant death syndrome at the age of 10 weeks. After his death, the couple used in vitro fertilization (IVF) to continue their family; they had twins in 2004, followed by triplets in 2006. The couple divorced in 2008 and have shared custody of their children. The elder twin he had with Wilson came out as a trans woman and, in 2022, officially changed her name to Vivian Jenna Wilson, adopting her mother's surname because she no longer wished to be associated with Musk. Musk began dating English actress Talulah Riley in 2008. They married two years later at Dornoch Cathedral in Scotland. In 2012, the couple divorced, then remarried the following year. After briefly filing for divorce in 2014, Musk finalized a second divorce from Riley in 2016. Musk then dated the American actress Amber Heard for several months in 2017; he had reportedly been "pursuing" her since 2012. In 2018, Musk and Canadian musician Grimes confirmed they were dating. Grimes and Musk have three children, born in 2020, 2021, and 2022.[g] Musk and Grimes originally gave their eldest child the name "X Æ A-12", which would have violated California regulations as it contained characters that are not in the modern English alphabet; the names registered on the birth certificate are "X" as a first name, "Æ A-Xii" as a middle name, and "Musk" as a last name. They received criticism for choosing a name perceived to be impractical and difficult to pronounce; Musk has said the intended pronunciation is "X Ash A Twelve". Their second child was born via surrogacy. Despite the pregnancy, Musk confirmed reports that the couple were "semi-separated" in September 2021; in an interview with Time in December 2021, he said he was single. In October 2023, Grimes sued Musk over parental rights and custody of X Æ A-Xii. Elon Musk has taken X Æ A-Xii to multiple official events in Washington, D.C. during Trump's second term in office. Also in July 2022, The Wall Street Journal reported that Musk allegedly had an affair with Nicole Shanahan, the wife of Google co-founder Sergey Brin, in 2021, leading to their divorce the following year. Musk denied the report. Musk also had a relationship with Australian actress Natasha Bassett, who has been described as "an occasional girlfriend". In October 2024, The New York Times reported Musk bought a Texas compound for his children and their mothers, though Musk denied having done so. Musk also has four children with Shivon Zilis, director of operations and special projects at Neuralink: twins born via IVF in 2021, a child born in 2024 via surrogacy and a child born in 2025.[h] On February 14, 2025, Ashley St. Clair, an influencer and author, posted on X claiming to have given birth to Musk's son Romulus five months earlier, which media outlets reported as Musk's supposed thirteenth child.[i] On February 22, 2025, it was reported that St Clair had filed for sole custody of her five-month-old son and for Musk to be recognised as the child's father. On March 31, 2025, Musk wrote that, while he was unsure if he was the father of St. Clair's child, he had paid St. Clair $2.5 million and would continue paying her $500,000 per year.[j] Later reporting from the Wall Street Journal indicated that $1 million of these payments to St. Clair were structured as a loan. In 2014, Musk and Ghislaine Maxwell appeared together in a photograph taken at an Academy Awards after-party, which Musk later described as a "photobomb". The January 2026 Epstein files contain emails between Musk and Epstein from 2012 to 2013, after Epstein's first conviction. Emails released on January 30, 2026, indicated that Epstein invited Musk to visit his private island on multiple occasions. The correspondence showed that while Epstein repeatedly encouraged Musk to attend, Musk did not visit the island. In one instance, Musk discussed the possibility of attending a party with his then-wife Talulah Riley and asked which day would be the "wildest party"; according to the emails, the visit did not take place after Epstein later cancelled the plans.[k] On Christmas day in 2012, Musk emailed Epstein asking "Do you have any parties planned? I’ve been working to the edge of sanity this year and so, once my kids head home after Christmas, I really want to hit the party scene in St Barts or elsewhere and let loose. The invitation is much appreciated, but a peaceful island experience is the opposite of what I’m looking for". Epstein replied that the "ratio on my island" might make Musk's wife uncomfortable to which Musk responded, "Ratio is not a problem for Talulah". On September 11, 2013, Epstein sent an email asking Musk if he had any plans for coming to New York for the opening of the United Nations General Assembly where many "interesting people" would be coming to his house to which Musk responded that "Flying to NY to see UN diplomats do nothing would be an unwise use of time". Epstein responded by stating "Do you think i am retarded. Just kidding, there is no one over 25 and all very cute." Musk has denied any close relationship with Epstein and described him as a "creep" who attempted to ingratiate himself with influential people. When Musk was asked in 2019 if he introduced Epstein to Mark Zuckerberg, Musk responded: "I don’t recall introducing Epstein to anyone, as I don’t know the guy well enough to do so." The released emails nonetheless showed cordial exchanges on a range of topics, including Musk's inquiry about parties on the island. The correspondence also indicated that Musk suggested hosting Epstein at SpaceX, while Epstein separately discussed plans to tour SpaceX and bring "the girls", though there is no evidence that such a visit occurred. Musk has described the release of the files a "distraction", later accusing the second Trump administration of suppressing them to protect powerful individuals, including Trump himself.[l] Wealth Elon Musk is the wealthiest person in the world, with an estimated net worth of US$690 billion as of January 2026, according to the Bloomberg Billionaires Index, and $852 billion according to Forbes, primarily from his ownership stakes in SpaceX and Tesla. Having been first listed on the Forbes Billionaires List in 2012, around 75% of Musk's wealth was derived from Tesla stock in November 2020, although he describes himself as "cash poor". According to Forbes, he became the first person in the world to achieve a net worth of $300 billion in 2021; $400 billion in December 2024; $500 billion in October 2025; $600 billion in mid-December 2025; $700 billion later that month; and $800 billion in February 2026. In November 2025, a Tesla pay package worth potentially $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Public image Although his ventures have been highly influential within their separate industries starting in the 2000s, Musk only became a public figure in the early 2010s. He has been described as an eccentric who makes spontaneous and impactful decisions, while also often making controversial statements, contrary to other billionaires who prefer reclusiveness to protect their businesses. Musk's actions and his expressed views have made him a polarizing figure. Biographer Ashlee Vance described people's opinions of Musk as polarized due to his "part philosopher, part troll" persona on Twitter. He has drawn denouncement for using his platform to mock the self-selection of personal pronouns, while also receiving praise for bringing international attention to matters like British survivors of grooming gangs. Musk has been described as an American oligarch due to his extensive influence over public discourse, social media, industry, politics, and government policy. After Trump's re-election, Musk's influence and actions during the transition period and the second presidency of Donald Trump led some to call him "President Musk", the "actual president-elect", "shadow president" or "co-president". Awards for his contributions to the development of the Falcon rockets include the American Institute of Aeronautics and Astronautics George Low Transportation Award in 2008, the Fédération Aéronautique Internationale Gold Space Medal in 2010, and the Royal Aeronautical Society Gold Medal in 2012. In 2015, he received an honorary doctorate in engineering and technology from Yale University and an Institute of Electrical and Electronics Engineers Honorary Membership. Musk was elected a Fellow of the Royal Society (FRS) in 2018.[m] In 2022, Musk was elected to the National Academy of Engineering. Time has listed Musk as one of the most influential people in the world in 2010, 2013, 2018, and 2021. Musk was selected as Time's "Person of the Year" for 2021. Then Time editor-in-chief Edward Felsenthal wrote that, "Person of the Year is a marker of influence, and few individuals have had more influence than Musk on life on Earth, and potentially life off Earth too." Notes References Works cited Further reading External links |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Black_hole#cite_note-262] | [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 |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Jews#cite_note-162] | [TOKENS: 15852] |
Contents Jews Jews (Hebrew: יְהוּדִים, ISO 259-2: Yehudim, Israeli pronunciation: [jehuˈdim]), or the Jewish people, are an ethnoreligious group and nation, originating from the Israelites of ancient Israel and Judah. They traditionally adhere to Judaism. Jewish ethnicity, religion, and community are highly interrelated, as Judaism is an ethnic religion, though many ethnic Jews do not practice it. Religious Jews regard converts to Judaism as members of the Jewish nation, pursuant to the long-standing conversion process. The Israelites emerged from the pre-existing Canaanite peoples to establish Israel and Judah in the Southern Levant during the Iron Age. Originally, Jews referred to the inhabitants of the kingdom of Judah and were distinguished from the gentiles and the Samaritans. According to the Hebrew Bible, these inhabitants predominately originate from the tribe of Judah, who were descendants of Judah, the fourth son of Jacob. The tribe of Benjamin were another significant demographic in Judah and were considered Jews too. By the late 6th century BCE, Judaism had evolved from the Israelite religion, dubbed Yahwism (for Yahweh) by modern scholars, having a theology that religious Jews believe to be the expression of the Mosaic covenant between God and the Jewish people. After the Babylonian exile, Jews referred to followers of Judaism, descendants of the Israelites, citizens of Judea, or allies of the Judean state. Jewish migration within the Mediterranean region during the Hellenistic period, followed by population transfers, caused by events like the Jewish–Roman wars, gave rise to the Jewish diaspora, consisting of diverse Jewish communities that maintained their sense of Jewish history, identity, and culture. In the following millennia, Jewish diaspora communities coalesced into three major ethnic subdivisions according to where their ancestors settled: the Ashkenazim (Central and Eastern Europe), the Sephardim (Iberian Peninsula), and the Mizrahim (Middle East and North Africa). While these three major divisions account for most of the world's Jews, there are other smaller Jewish groups outside of the three. Prior to World War II, the global Jewish population reached a peak of 16.7 million, representing around 0.7% of the world's population at that time. During World War II, approximately six million Jews throughout Europe were systematically murdered by Nazi Germany in a genocide known as the Holocaust. Since then, the population has slowly risen again, and as of 2021[update], was estimated to be at 15.2 million by the demographer Sergio Della Pergola or less than 0.2% of the total world population in 2012.[b] Today, over 85% of Jews live in Israel or the United States. Israel, whose population is 73.9% Jewish, is the only country where Jews comprise more than 2.5% of the population. Jews have significantly influenced and contributed to the development and growth of human progress in many fields, both historically and in modern times, including in science and technology, philosophy, ethics, literature, governance, business, art, music, comedy, theatre, cinema, architecture, food, medicine, and religion. Jews founded Christianity and had an indirect but profound influence on Islam. In these ways and others, Jews have played a significant role in the development of Western culture. Name and etymology The term "Jew" is derived from the Hebrew word יְהוּדִי Yehudi, with the plural יְהוּדִים Yehudim. Endonyms in other Jewish languages include the Ladino ג׳ודיו Djudio (plural ג׳ודיוס, Djudios) and the Yiddish ייִד Yid (plural ייִדן Yidn). Though Genesis 29:35 and 49:8 connect "Judah" with the verb yada, meaning "praise", scholars generally agree that "Judah" most likely derives from the name of a Levantine geographic region dominated by gorges and ravines. The gradual ethnonymic shift from "Israelites" to "Jews", regardless of their descent from Judah, although not contained in the Torah, is made explicit in the Book of Esther (4th century BCE) of the Tanakh. Some modern scholars disagree with the conflation, based on the works of Josephus, Philo and Apostle Paul. The English word "Jew" is a derivation of Middle English Gyw, Iewe. The latter was loaned from the Old French giu, which itself evolved from the earlier juieu, which in turn derived from judieu/iudieu which through elision had dropped the letter "d" from the Medieval Latin Iudaeus, which, like the New Testament Greek term Ioudaios, meant both "Jew" and "Judean" / "of Judea". The Greek term was a loan from Aramaic *yahūdāy, corresponding to Hebrew יְהוּדִי Yehudi. Some scholars prefer translating Ioudaios as "Judean" in the Bible since it is more precise, denotes the community's origins and prevents readers from engaging in antisemitic eisegesis. Others disagree, believing that it erases the Jewish identity of Biblical characters such as Jesus. Daniel R. Schwartz distinguishes "Judean" and "Jew". Here, "Judean" refers to the inhabitants of Judea, which encompassed southern Palestine. Meanwhile, "Jew" refers to the descendants of Israelites that adhere to Judaism. Converts are included in the definition. But Shaye J.D. Cohen argues that "Judean" is inclusive of believers of the Judean God and allies of the Judean state. Another scholar, Jodi Magness, wrote the term Ioudaioi refers to a "people of Judahite/Judean ancestry who worshipped the God of Israel as their national deity and (at least nominally) lived according to his laws." The etymological equivalent is in use in other languages, e.g., يَهُودِيّ yahūdī (sg.), al-yahūd (pl.), in Arabic, "Jude" in German, "judeu" in Portuguese, "Juif" (m.)/"Juive" (f.) in French, "jøde" in Danish and Norwegian, "judío/a" in Spanish, "jood" in Dutch, "żyd" in Polish etc., but derivations of the word "Hebrew" are also in use to describe a Jew, e.g., in Italian (Ebreo), in Persian ("Ebri/Ebrani" (Persian: عبری/عبرانی)) and Russian (Еврей, Yevrey). The German word "Jude" is pronounced [ˈjuːdə], the corresponding adjective "jüdisch" [ˈjyːdɪʃ] (Jewish) is the origin of the word "Yiddish". According to The American Heritage Dictionary of the English Language, fourth edition (2000), It is widely recognized that the attributive use of the noun Jew, in phrases such as Jew lawyer or Jew ethics, is both vulgar and highly offensive. In such contexts Jewish is the only acceptable possibility. Some people, however, have become so wary of this construction that they have extended the stigma to any use of Jew as a noun, a practice that carries risks of its own. In a sentence such as There are now several Jews on the council, which is unobjectionable, the substitution of a circumlocution like Jewish people or persons of Jewish background may in itself cause offense for seeming to imply that Jew has a negative connotation when used as a noun. Identity Judaism shares some of the characteristics of a nation, an ethnicity, a religion, and a culture, making the definition of who is a Jew vary slightly depending on whether a religious or national approach to identity is used.[better source needed] Generally, in modern secular usage, Jews include three groups: people who were born to a Jewish family regardless of whether or not they follow the religion, those who have some Jewish ancestral background or lineage (sometimes including those who do not have strictly matrilineal descent), and people without any Jewish ancestral background or lineage who have formally converted to Judaism and therefore are followers of the religion. In the context of biblical and classical literature, Jews could refer to inhabitants of the Kingdom of Judah, or the broader Judean region, allies of the Judean state, or anyone that followed Judaism. Historical definitions of Jewish identity have traditionally been based on halakhic definitions of matrilineal descent, and halakhic conversions. These definitions of who is a Jew date back to the codification of the Oral Torah into the Babylonian Talmud, around 200 CE. Interpretations by Jewish sages of sections of the Tanakh – such as Deuteronomy 7:1–5, which forbade intermarriage between their Israelite ancestors and seven non-Israelite nations: "for that [i.e. giving your daughters to their sons or taking their daughters for your sons,] would turn away your children from following me, to serve other gods"[failed verification] – are used as a warning against intermarriage between Jews and gentiles. Leviticus 24:10 says that the son in a marriage between a Hebrew woman and an Egyptian man is "of the community of Israel." This is complemented by Ezra 10:2–3, where Israelites returning from Babylon vow to put aside their gentile wives and their children. A popular theory is that the rape of Jewish women in captivity brought about the law of Jewish identity being inherited through the maternal line, although scholars challenge this theory citing the Talmudic establishment of the law from the pre-exile period. Another argument is that the rabbis changed the law of patrilineal descent to matrilineal descent due to the widespread rape of Jewish women by Roman soldiers. Since the anti-religious Haskalah movement of the late 18th and 19th centuries, halakhic interpretations of Jewish identity have been challenged. According to historian Shaye J. D. Cohen, the status of the offspring of mixed marriages was determined patrilineally in the Bible. He brings two likely explanations for the change in Mishnaic times: first, the Mishnah may have been applying the same logic to mixed marriages as it had applied to other mixtures (Kil'ayim). Thus, a mixed marriage is forbidden as is the union of a horse and a donkey, and in both unions the offspring are judged matrilineally. Second, the Tannaim may have been influenced by Roman law, which dictated that when a parent could not contract a legal marriage, offspring would follow the mother. Rabbi Rivon Krygier follows a similar reasoning, arguing that Jewish descent had formerly passed through the patrilineal descent and the law of matrilineal descent had its roots in the Roman legal system. Origins The prehistory and ethnogenesis of the Jews are closely intertwined with archaeology, biology, historical textual records, mythology, and religious literature. The ethnic origin of the Jews lie in the Israelites, a confederation of Iron Age Semitic-speaking tribes that inhabited a part of Canaan during the tribal and monarchic periods. Modern Jews are named after and also descended from the southern Israelite Kingdom of Judah. Gary A. Rendsburg links the early Canaanite nomadic pastoralists confederation to the Shasu known to the Egyptians around the 15th century BCE. According to the Hebrew Bible narrative, Jewish history begins with the Biblical patriarchs such as Abraham, his son Isaac, Isaac's son Jacob, and the Biblical matriarchs Sarah, Rebecca, Leah, and Rachel, who lived in Canaan. The twelve sons of Jacob subsequently gave birth to the Twelve Tribes. Jacob and his family migrated to Ancient Egypt after being invited to live with Jacob's son Joseph by the Pharaoh himself. Jacob's descendants were later enslaved until the Exodus, led by Moses. Afterwards, the Israelites conquered Canaan under Moses' successor Joshua, and went through the period of the Biblical judges after the death of Joshua. Through the mediation of Samuel, the Israelites were subject to a king, Saul, who was succeeded by David and then Solomon, after whom the United Monarchy ended and was split into a separate Kingdom of Israel and a Kingdom of Judah. The Kingdom of Judah is described as comprising the tribes of Judah, Benjamin and partially, Levi. They later assimilated remnants of other tribes who migrated there from the northern Kingdom of Israel. In the extra-biblical record, the Israelites become visible as a people between 1200 and 1000 BCE. There is well accepted archeological evidence referring to "Israel" in the Merneptah Stele, which dates to about 1200 BCE, and in the Mesha stele from 840 BCE. It is debated whether a period like that of the Biblical judges occurred and if there ever was a United Monarchy. There is further disagreement about the earliest existence of the Kingdoms of Israel and Judah and their extent and power. Historians agree that a Kingdom of Israel existed by c. 900 BCE,: 169–95 there is a consensus that a Kingdom of Judah existed by c. 700 BCE at least, and recent excavations in Khirbet Qeiyafa have provided strong evidence for dating the Kingdom of Judah to the 10th century BCE. In 587 BCE, Nebuchadnezzar II, King of the Neo-Babylonian Empire, besieged Jerusalem, destroyed the First Temple and deported parts of the Judahite population. Scholars disagree regarding the extent to which the Bible should be accepted as a historical source for early Israelite history. Rendsburg states that there are two approximately equal groups of scholars who debate the historicity of the biblical narrative, the minimalists who largely reject it, and the maximalists who largely accept it, with the minimalists being the more vocal of the two. Some of the leading minimalists reframe the biblical account as constituting the Israelites' inspiring national myth narrative, suggesting that according to the modern archaeological and historical account, the Israelites and their culture did not overtake the region by force, but instead branched out of the Canaanite peoples and culture through the development of a distinct monolatristic—and later monotheistic—religion of Yahwism centered on Yahweh, one of the gods of the Canaanite pantheon. The growth of Yahweh-centric belief, along with a number of cultic practices, gradually gave rise to a distinct Israelite ethnic group, setting them apart from other Canaanites. According to Dever, modern archaeologists have largely discarded the search for evidence of the biblical narrative surrounding the patriarchs and the exodus. According to the maximalist position, the modern archaeological record independently points to a narrative which largely agrees with the biblical account. This narrative provides a testimony of the Israelites as a nomadic people known to the Egyptians as belonging to the Shasu. Over time these nomads left the desert and settled on the central mountain range of the land of Canaan, in simple semi-nomadic settlements in which pig bones are notably absent. This population gradually shifted from a tribal lifestyle to a monarchy. While the archaeological record of the ninth century BCE provides evidence for two monarchies, one in the south under a dynasty founded by a figure named David with its capital in Jerusalem, and one in the north under a dynasty founded by a figure named Omri with its capital in Samaria. It also points to an early monarchic period in which these regions shared material culture and religion, suggesting a common origin. Archaeological finds also provide evidence for the later cooperation of these two kingdoms in their coalition against Aram, and for their destructions by the Assyrians and later by the Babylonians. Genetic studies on Jews show that most Jews worldwide bear a common genetic heritage which originates in the Middle East, and that they share certain genetic traits with other Gentile peoples of the Fertile Crescent. The genetic composition of different Jewish groups shows that Jews share a common gene pool dating back four millennia, as a marker of their common ancestral origin. Despite their long-term separation, Jewish communities maintained their unique commonalities, propensities, and sensibilities in culture, tradition, and language. History The earliest recorded evidence of a people by the name of Israel appears in the Merneptah Stele, which dates to around 1200 BCE. The majority of scholars agree that this text refers to the Israelites, a group that inhabited the central highlands of Canaan, where archaeological evidence shows that hundreds of small settlements were constructed between the 12th and 10th centuries BCE. The Israelites differentiated themselves from neighboring peoples through various distinct characteristics including religious practices, prohibition on intermarriage, and an emphasis on genealogy and family history. In the 10th century BCE, two neighboring Israelite kingdoms—the northern Kingdom of Israel and the southern Kingdom of Judah—emerged. Since their inception, they shared ethnic, cultural, linguistic and religious characteristics despite a complicated relationship. Israel, with its capital mostly in Samaria, was larger and wealthier, and soon developed into a regional power. In contrast, Judah, with its capital in Jerusalem, was less prosperous and covered a smaller, mostly mountainous territory. However, while in Israel the royal succession was often decided by a military coup d'état, resulting in several dynasty changes, political stability in Judah was much greater, as it was ruled by the House of David for the whole four centuries of its existence. Scholars also describe Biblical Jews as a 'proto-nation', in the modern nationalist sense, comparable to classical Greeks, the Gauls and the British Celts. Around 720 BCE, Kingdom of Israel was destroyed when it was conquered by the Neo-Assyrian Empire, which came to dominate the ancient Near East. Under the Assyrian resettlement policy, a significant portion of the northern Israelite population was exiled to Mesopotamia and replaced by immigrants from the same region. During the same period, and throughout the 7th century BCE, the Kingdom of Judah, now under Assyrian vassalage, experienced a period of prosperity and witnessed a significant population growth. This prosperity continued until the Neo-Assyrian king Sennacherib devastated the region of Judah in response to a rebellion in the area, ultimately halting at Jerusalem. Later in the same century, the Assyrians were defeated by the rising Neo-Babylonian Empire, and Judah became its vassal. In 587 BCE, following a revolt in Judah, the Babylonian king Nebuchadnezzar II besieged and destroyed Jerusalem and the First Temple, putting an end to the kingdom. The majority of Jerusalem's residents, including the kingdom's elite, were exiled to Babylon. According to the Book of Ezra, the Persian Cyrus the Great ended the Babylonian exile in 538 BCE, the year after he captured Babylon. The exile ended with the return under Zerubbabel the Prince (so called because he was a descendant of the royal line of David) and Joshua the Priest (a descendant of the line of the former High Priests of the Temple) and their construction of the Second Temple circa 521–516 BCE. As part of the Persian Empire, the former Kingdom of Judah became the province of Judah (Yehud Medinata), with a smaller territory and a reduced population. Judea was under control of the Achaemenids until the fall of their empire in c. 333 BCE to Alexander the Great. After several centuries under foreign imperial rule, the Maccabean Revolt against the Seleucid Empire resulted in an independent Hasmonean kingdom, under which the Jews once again enjoyed political independence for a period spanning from 110 to 63 BCE. Under Hasmonean rule the boundaries of their kingdom were expanded to include not only the land of the historical kingdom of Judah, but also the Galilee and Transjordan. In the beginning of this process the Idumeans, who had infiltrated southern Judea after the destruction of the First Temple, were converted en masse. In 63 BCE, Judea was conquered by the Romans. From 37 BCE to 6 CE, the Romans allowed the Jews to maintain some degree of independence by installing the Herodian dynasty as vassal kings. However, Judea eventually came directly under Roman control and was incorporated into the Roman Empire as the province of Judaea. The Jewish–Roman wars, a series of failed uprisings against Roman rule during the first and second centuries CE, had profound and devastating consequences for the Jewish population of Judaea. The First Jewish–Roman War (66–73/74 CE) culminated in the destruction of Jerusalem and the Second Temple, after which the significantly diminished Jewish population was stripped of political autonomy. A few generations later, the Bar Kokhba revolt (132–136 CE) erupted in response to Roman plans to rebuild Jerusalem as a Roman colony, and, possibly, to restrictions on circumcision. Its violent suppression by the Romans led to the near-total depopulation of Judea, and the demographic and cultural center of Jewish life shifted to Galilee. Jews were subsequently banned from residing in Jerusalem and the surrounding area, and the province of Judaea was renamed Syria Palaestina. These developments effectively ended Jewish efforts to restore political sovereignty in the region for nearly two millennia. Similar upheavals impacted the Jewish communities in the empire's eastern provinces during the Diaspora Revolt (115–117 CE), leading to the near-total destruction of Jewish diaspora communities in Libya, Cyprus and Egypt, including the highly influential community in Alexandria. The destruction of the Second Temple in 70 CE brought profound changes to Judaism. With the Temple's central place in Jewish worship gone, religious practices shifted towards prayer, Torah study (including Oral Torah), and communal gatherings in synagogues. Judaism also lost much of its sectarian nature.: 69 Two of the three main sects that flourished during the late Second Temple period, namely the Sadducees and Essenes, eventually disappeared, while Pharisaic beliefs became the foundational, liturgical, and ritualistic basis of Rabbinic Judaism, which emerged as the prevailing form of Judaism since late antiquity. The Jewish diaspora existed well before the destruction of the Second Temple in 70 CE and had been ongoing for centuries, with the dispersal driven by both forced expulsions and voluntary migrations. In Mesopotamia, a testimony to the beginnings of the Jewish community can be found in Joachin's ration tablets, listing provisions allotted to the exiled Judean king and his family by Nebuchadnezzar II, and further evidence are the Al-Yahudu tablets, dated to the 6th–5th centuries BCE and related to the exiles from Judea arriving after the destruction of the First Temple, though there is ample evidence for the presence of Jews in Babylonia even from 626 BCE. In Egypt, the documents from Elephantine reveal the trials of a community founded by a Persian Jewish garrison at two fortresses on the frontier during the 5th–4th centuries BCE, and according to Josephus the Jewish community in Alexandria existed since the founding of the city in the 4th century BCE by Alexander the Great. By 200 BCE, there were well established Jewish communities both in Egypt and Mesopotamia ("Babylonia" in Jewish sources) and in the two centuries that followed, Jewish populations were also present in Asia Minor, Greece, Macedonia, Cyrene, and, beginning in the middle of the first century BCE, in the city of Rome. Later, in the first centuries CE, as a result of the Jewish-Roman Wars, a large number of Jews were taken as captives, sold into slavery, or compelled to flee from the regions affected by the wars, contributing to the formation and expansion of Jewish communities across the Roman Empire as well as in Arabia and Mesopotamia. After the Bar Kokhba revolt, the Jewish population in Judaea—now significantly reduced— made efforts to recover from the revolt's devastating effects, but never fully regained its former strength. Between the second and fourth centuries CE, the region of Galilee emerged as the primary center of Jewish life in Syria Palaestina, experiencing both demographic growth and cultural development. It was during this period that two central rabbinic texts, the Mishnah and the Jerusalem Talmud, were composed. The Romans recognized the patriarchs—rabbinic sages such as Judah ha-Nasi—as representatives of the Jewish people, granting them a certain degree of autonomy. However, as the Roman Empire gave way to the Christianized Byzantine Empire under Constantine, Jews began to face persecution by both the Church and imperial authorities, Jews came to be persecuted by the church and the authorities, and many immigrated to communities in the diaspora. By the fourth century CE, Jews are believed to have lost their demographic majority in Syria Palaestina. The long-established Jewish community of Mesopotamia, which had been living under Parthian and later Sasanian rule, beyond the confines of the Roman Empire, became an important center of Jewish study as Judea's Jewish population declined. Estimates often place the Babylonian Jewish community of the 3rd to 7th centuries at around one million, making it the largest Jewish diaspora community of that period. Under the political leadership of the exilarch, who was regarded as a royal heir of the House of David, this community had an autonomous status and served as a place of refuge for the Jews of Syria Palaestina. A number of significant Talmudic academies, such as the Nehardea, Pumbedita, and Sura academies, were established in Mesopotamia, and many important Amoraim were active there. The Babylonian Talmud, a centerpiece of Jewish religious law, was compiled in Babylonia in the 3rd to 6th centuries. Jewish diaspora communities are generally described to have coalesced into three major ethnic subdivisions according to where their ancestors settled: the Ashkenazim (initially in the Rhineland and France), the Sephardim (initially in the Iberian Peninsula), and the Mizrahim (Middle East and North Africa). Romaniote Jews, Tunisian Jews, Yemenite Jews, Egyptian Jews, Ethiopian Jews, Bukharan Jews, Mountain Jews, and other groups also predated the arrival of the Sephardic diaspora. During the same period, Jewish communities in the Middle East thrived under Islamic rule, especially in cities like Baghdad, Cairo, and Damascus. In Babylonia, from the 7th to 11th centuries the Pumbedita and Sura academies led the Arab and to an extent the entire Jewish world. The deans and students of said academies defined the Geonic period in Jewish history. Following this period were the Rishonim who lived from the 11th to 15th centuries. Like their European counterparts, Jews in the Middle East and North Africa also faced periods of persecution and discriminatory policies, with the Almohad Caliphate in North Africa and Iberia issuing forced conversion decrees, causing Jews such as Maimonides to seek safety in other regions. Despite experiencing repeated waves of persecution, Ashkenazi Jews in Western Europe worked in a variety of fields, making an impact on their communities' economy and societies. In Francia, for example, figures like Isaac Judaeus and Armentarius occupied prominent social and economic positions. Francia also witnessed the development of a sophisticated tradition of biblical commentary, as exemplified by Rashi and the tosafists. In 1144, the first documented blood libel occurred in Norwich, England, marking an escalation in the pattern of discrimination and violence that Jews had already been subjected to throughout medieval Europe. During the 12th and 13th centuries, Jews faced frequent antisemitic legislation - including laws prescribing distinctive dress - alongside segregation, repeated blood libels, pogroms, and massacres such as the Rhineland Massacres (1066). The Jews of the Holy Roman Empire were designated Servi camerae regis (“servants of the imperial chamber”) by Frederick II, a status that afforded limited protection while simultaneously entangling them in the political struggles between the emperor and the German principalities and cities. Persecution intensified during the Black Death in the mid-14th century, when Jews were accused of poisoning wells and many communities were destroyed. These pressures, combined with major expulsions such as that from England in 1290, gradually pushed Ashkenazi Jewish populations eastward into Poland, Lithuania, and Russia. One of the largest Jewish communities of the Middle Ages was in the Iberian Peninsula, which for a time contained the largest Jewish population in Europe. Iberian Jewry endured discrimination under the Visigoths but saw its fortunes improve under Umayyad rule and later the Taifa kingdoms. During this period, the Jews of Muslim Spain entered a "Golden Age" marked by achievements in Hebrew poetry and literature, religious scholarship, grammar, medicine and science, with leading figures including Hasdai ibn Shaprut, Judah Halevi, Moses ibn Ezra and Solomon ibn Gabirol. Jews also rose to high office, most notably Samuel ibn Naghrillah, a scholar and poet who served as grand vizier and military commander of Granada. The Golden Age ended with the rise of the radical Almoravid and Almohad dynasties, whose persecutions drove many Jews from Iberia (including Maimonides), together with the advancing Reconquista. In 1391, widespread pogroms swept across Spain, leaving thousands dead and forcing mass conversions. The Spanish Inquisition was later established to pursue, torture and execute conversos who continued to practice Judaism in secret, while public disputations were staged to discredit Judaism. In 1492, after the Reconquista, Isabella I of Castile and Ferdinand II of Aragon decreed the expulsion of all Jews who refused conversion, sending an estimated 200,000 into exile in Portugal, Italy, North Africa, and the Ottoman Empire. In 1497, Portugal's Jews, about 30,000, were formally ordered expelled but instead were forcibly converted to retain their economic role. In 1498, some 3,500 Jews were expelled from Navarre. Many converts outwardly adopted Christianity while secretly preserving Jewish practices, becoming crypto-Jews (also known as marranos or anusim), who remained targets of the various Inquisitions for centuries. Following the expulsions from Spain and Portugal in the 1490s, Jewish exiles dispersed across the Mediterranean, Europe, and North Africa. Many settled in the Ottoman Empire—which, replacing the Iberian Peninsula, became home to the world's largest Jewish population—where new communities developed in Anatolia, the Balkans, and the Land of Israel. Cities such as Istanbul and Thessaloniki grew into major Jewish centers, while in 16th-century Safed a flourishing spiritual life took shape. There, Solomon Alkabetz, Moses Cordovero, and Isaac Luria developed influential new schools of Kabbalah, giving powerful impetus to Jewish mysticism, and Joseph Karo composed the Shulchan Aruch, which became a cornerstone of Jewish law. In the 17th century, Portuguese conversos who returned to Judaism and engaged in trade and banking helped establish Amsterdam as a prosperous Jewish center, while also forming communities in cities such as Antwerp and London. This period also witnessed waves of messianic fervor, most notably the rise of the Sabbatean movement in the 1660s, led by Sabbatai Zvi of İzmir, which reverberated throughout the Jewish world. In Eastern Europe, Poland–Lithuania became the principal center of Ashkenazi Jewry, eventually becoming home to the largest Jewish population in the world. Jewish life flourished there from in the early modern era, supported by relative stability, economic opportunity, and strong communal institutions. The mid-17th century brought devastation with the Cossack uprisings in Ukraine, which reversed migration flows and sent refugees westward, yet Poland–Lithuania remained the demographic and cultural heartland of Ashkenazic Jewry. Following the partitions of Poland, most of its Jews came under Russian rule and were confined to the "Pale of Settlement." The 18th century also witnessed new religious and intellectual currents. Hasidism, founded by Baal Shem Tov, emphasized mysticism and piety, while its opponents, the Misnagdim ("opponents") led by the Vilna Gaon, defended rabbinic scholarship and tradition. In Western Europe, during the 1760s and 1770s, the Haskalah (Jewish Enlightenment) emerged in German-speaking lands, where figures such as Moses Mendelssohn promoted secular learning, vernacular literacy, and integration into European society. Elsewhere, Jews began to be re-admitted to Western Europe, including England, where Menasseh ben Israel petitioned Oliver Cromwell for their return. In the Americas, Jews of Sephardic descent first arrived as conversos in Spanish and Portuguese colonies, where many faced trial by Inquisition tribunals for "judaizing." A more durable presence began in Dutch Brazil, where Jews openly practiced their religion and established the first synagogues in the New World, before the Portuguese reconquest forced their dispersal to Amsterdam, the Caribbean, and North America. Sephardic communities took root in Curaçao, Suriname, Jamaica, and Barbados, later joined by Ashkenazi migrants. In North America, Jews were present from the mid-17th century, with New Amsterdam hosting the first organized congregation in 1654. By the time of the American Revolution, small communities in New York, Newport, Philadelphia, Savannah, and Charleston played an active role in the struggle for independence. In the late 19th century, Jews in Western Europe gradually achieved legal emancipation, though social acceptance remained limited by persistent antisemitism and rising nationalism. In Eastern Europe, particularly within the Russian Empire's Pale of Settlement, Jews faced mounting legal restrictions and recurring pogroms. From this environment emerged Zionism, a national revival movement originating in Central and Eastern Europe that sought to re-establish a Jewish polity in the Land of Israel as a means of returning the Jewish people to their ancestral homeland and ending centuries of exile and persecution. This led to waves of Jewish migration to Ottoman-controlled Palestine. Theodor Herzl, who is considered the father of political Zionism, offered his vision of a future Jewish state in his 1896 book Der Judenstaat (The Jewish State); a year later, he presided over the First Zionist Congress. The antisemitism that inflicted Jewish communities in Europe also triggered a mass exodus of 2.8 million Jews to the United States between 1881 and 1924. Despite this, some Jews of Europe and the United States were able to make great achievements in various fields of science and culture. Among the most influential from this period are Albert Einstein in physics, Sigmund Freud in psychology, Franz Kafka in literature, and Irving Berlin in music. Many Nobel Prize winners at this time were Jewish, as is still the case. When Adolf Hitler and the Nazi Party came to power in Germany in 1933, the situation for Jews deteriorated rapidly as a direct result of Nazi policies. Many Jews fled from Europe to Mandatory Palestine, the United States, and the Soviet Union as a result of racial anti-Semitic laws, economic difficulties, and the fear of an impending war. World War II started in 1939, and by 1941, Hitler occupied almost all of Europe. Following the German invasion of the Soviet Union in 1941, the Final Solution—an extensive, organized effort with an unprecedented scope intended to annihilate the Jewish people—began, and resulted in the persecution and murder of Jews in Europe and North Africa. In Poland, three million were murdered in gas chambers in all concentration camps combined, with one million at the Auschwitz camp complex alone. The Holocaust is the name given to this genocide, in which six million Jews in total were systematically murdered. Before and during the Holocaust, enormous numbers of Jews immigrated to Mandatory Palestine. In 1944, the Jewish insurgency in Mandatory Palestine began with the aim of gaining full independence from the United Kingdom. On 14 May 1948, upon the termination of the mandate, David Ben-Gurion declared the creation of the State of Israel, a Jewish and democratic state. Immediately afterwards, all neighboring Arab states invaded, and were resisted by the newly formed Israel Defense Forces. In 1949, the war ended and Israel started building its state and absorbing waves of Aliyah, granting citizenship to Jews all over the world via the Law of Return passed in 1950. However, both the Israeli–Palestinian conflict and wider Arab–Israeli conflict continue to this day. Culture The Jewish people and the religion of Judaism are strongly interrelated. Converts to Judaism have a status within the Jewish people equal to those born into it. However, converts who go on to practice no Judaism are likely to be viewed with skepticism. Mainstream Judaism does not proselytize, and conversion is considered a difficult task. A significant portion of conversions are undertaken by children of mixed marriages, or would-be or current spouses of Jews. The Hebrew Bible, a religious interpretation of the traditions and early history of the Jews, established the first of the Abrahamic religions, which are now practiced by 54 percent of the world. Judaism guides its adherents in both practice and belief, and has been called not only a religion, but also a "way of life," which has made drawing a clear distinction between Judaism, Jewish culture, and Jewish identity rather difficult. Throughout history, in eras and places as diverse as the ancient Hellenic world, in Europe before and after The Age of Enlightenment (see Haskalah), in Islamic Spain and Portugal, in North Africa and the Middle East, India, China, or the contemporary United States and Israel, cultural phenomena have developed that are in some sense characteristically Jewish without being at all specifically religious. Some factors in this come from within Judaism, others from the interaction of Jews or specific communities of Jews with their surroundings, and still others from the inner social and cultural dynamics of the community, as opposed to from the religion itself. This phenomenon has led to considerably different Jewish cultures unique to their own communities. Hebrew is the liturgical language of Judaism (termed lashon ha-kodesh, "the holy tongue"), the language in which most of the Hebrew scriptures (Tanakh) were composed, and the daily speech of the Jewish people for centuries. By the 5th century BCE, Aramaic, a closely related tongue, joined Hebrew as the spoken language in Judea. By the 3rd century BCE, some Jews of the diaspora were speaking Greek. Others, such as in the Jewish communities of Asoristan, known to Jews as Babylonia, were speaking Hebrew and Aramaic, the languages of the Babylonian Talmud. Dialects of these same languages were also used by the Jews of Syria Palaestina at that time.[citation needed] For centuries, Jews worldwide have spoken the local or dominant languages of the regions they migrated to, often developing distinctive dialectal forms or branches that became independent languages. Yiddish is the Judaeo-German language developed by Ashkenazi Jews who migrated to Central Europe. Ladino is the Judaeo-Spanish language developed by Sephardic Jews who migrated to the Iberian Peninsula. Due to many factors, including the impact of the Holocaust on European Jewry, the Jewish exodus from Arab and Muslim countries, and widespread emigration from other Jewish communities around the world, ancient and distinct Jewish languages of several communities, including Judaeo-Georgian, Judaeo-Arabic, Judaeo-Berber, Krymchak, Judaeo-Malayalam and many others, have largely fallen out of use. For over sixteen centuries Hebrew was used almost exclusively as a liturgical language, and as the language in which most books had been written on Judaism, with a few speaking only Hebrew on the Sabbath. Hebrew was revived as a spoken language by Eliezer ben Yehuda, who arrived in Palestine in 1881. It had not been used as a mother tongue since Tannaic times. Modern Hebrew is designated as the "State language" of Israel. Despite efforts to revive Hebrew as the national language of the Jewish people, knowledge of the language is not commonly possessed by Jews worldwide and English has emerged as the lingua franca of the Jewish diaspora. Although many Jews once had sufficient knowledge of Hebrew to study the classic literature, and Jewish languages like Yiddish and Ladino were commonly used as recently as the early 20th century, most Jews lack such knowledge today and English has by and large superseded most Jewish vernaculars. The three most commonly spoken languages among Jews today are Hebrew, English, and Russian. Some Romance languages, particularly French and Spanish, are also widely used. Yiddish has been spoken by more Jews in history than any other language, but it is far less used today following the Holocaust and the adoption of Modern Hebrew by the Zionist movement and the State of Israel. In some places, the mother language of the Jewish community differs from that of the general population or the dominant group. For example, in Quebec, the Ashkenazic majority has adopted English, while the Sephardic minority uses French as its primary language. Similarly, South African Jews adopted English rather than Afrikaans. Due to both Czarist and Soviet policies, Russian has superseded Yiddish as the language of Russian Jews, but these policies have also affected neighboring communities. Today, Russian is the first language for many Jewish communities in a number of Post-Soviet states, such as Ukraine and Uzbekistan,[better source needed] as well as for Ashkenazic Jews in Azerbaijan, Georgia, and Tajikistan. Although communities in North Africa today are small and dwindling, Jews there had shifted from a multilingual group to a monolingual one (or nearly so), speaking French in Algeria, Morocco, and the city of Tunis, while most North Africans continue to use Arabic or Berber as their mother tongue.[citation needed] There is no single governing body for the Jewish community, nor a single authority with responsibility for religious doctrine. Instead, a variety of secular and religious institutions at the local, national, and international levels lead various parts of the Jewish community on a variety of issues. Today, many countries have a Chief Rabbi who serves as a representative of that country's Jewry. Although many Hasidic Jews follow a certain hereditary Hasidic dynasty, there is no one commonly accepted leader of all Hasidic Jews. Many Jews believe that the Messiah will act a unifying leader for Jews and the entire world. A number of modern scholars of nationalism support the existence of Jewish national identity in antiquity. One of them is David Goodblatt, who generally believes in the existence of nationalism before the modern period. In his view, the Bible, the parabiblical literature and the Jewish national history provide the base for a Jewish collective identity. Although many of the ancient Jews were illiterate (as were their neighbors), their national narrative was reinforced through public readings. The Hebrew language also constructed and preserved national identity. Although it was not widely spoken after the 5th century BCE, Goodblatt states: the mere presence of the language in spoken or written form could invoke the concept of a Jewish national identity. Even if one knew no Hebrew or was illiterate, one could recognize that a group of signs was in Hebrew script. ... It was the language of the Israelite ancestors, the national literature, and the national religion. As such it was inseparable from the national identity. Indeed its mere presence in visual or aural medium could invoke that identity. Anthony D. Smith, an historical sociologist considered one of the founders of the field of nationalism studies, wrote that the Jews of the late Second Temple period provide "a closer approximation to the ideal type of the nation [...] than perhaps anywhere else in the ancient world." He adds that this observation "must make us wary of pronouncing too readily against the possibility of the nation, and even a form of religious nationalism, before the onset of modernity." Agreeing with Smith, Goodblatt suggests omitting the qualifier "religious" from Smith's definition of ancient Jewish nationalism, noting that, according to Smith, a religious component in national memories and culture is common even in the modern era. This view is echoed by political scientist Tom Garvin, who writes that "something strangely like modern nationalism is documented for many peoples in medieval times and in classical times as well," citing the ancient Jews as one of several "obvious examples", alongside the classical Greeks and the Gaulish and British Celts. Fergus Millar suggests that the sources of Jewish national identity and their early nationalist movements in the first and second centuries CE included several key elements: the Bible as both a national history and legal source, the Hebrew language as a national language, a system of law, and social institutions such as schools, synagogues, and Sabbath worship. Adrian Hastings argued that Jews are the "true proto-nation", that through the model of ancient Israel found in the Hebrew Bible, provided the world with the original concept of nationhood which later influenced Christian nations. However, following Jerusalem's destruction in the first century CE, Jews ceased to be a political entity and did not resemble a traditional nation-state for almost two millennia. Despite this, they maintained their national identity through collective memory, religion and sacred texts, even without land or political power, and remained a nation rather than just an ethnic group, eventually leading to the rise of Zionism and the establishment of Israel. Steven Weitzman suggests that Jewish nationalist sentiment in antiquity was encouraged because under foreign rule (Persians, Greeks, Romans) Jews were able to claim that they were an ancient nation. This claim was based on the preservation and reverence of their scriptures, the Hebrew language, the Temple and priesthood, and other traditions of their ancestors. Doron Mendels further observes that the Hasmonean kingdom, one of the few examples of indigenous statehood at its time, significantly reinforced Jewish national consciousness. The memory of this period of independence contributed to the persistent efforts to revive Jewish sovereignty in Judea, leading to the major revolts against Roman rule in the 1st and 2nd centuries CE. Demographics Within the world's Jewish population there are distinct ethnic divisions, most of which are primarily the result of geographic branching from an originating Israelite population, and subsequent independent evolutions. An array of Jewish communities was established by Jewish settlers in various places around the Old World, often at great distances from one another, resulting in effective and often long-term isolation. During the millennia of the Jewish diaspora the communities would develop under the influence of their local environments: political, cultural, natural, and populational. Today, manifestations of these differences among the Jews can be observed in Jewish cultural expressions of each community, including Jewish linguistic diversity, culinary preferences, liturgical practices, religious interpretations, as well as degrees and sources of genetic admixture. Jews are often identified as belonging to one of two major groups: the Ashkenazim and the Sephardim. Ashkenazim are so named in reference to their geographical origins (their ancestors' culture coalesced in the Rhineland, an area historically referred to by Jews as Ashkenaz). Similarly, Sephardim (Sefarad meaning "Spain" in Hebrew) are named in reference their origins in Iberia. The diverse groups of Jews of the Middle East and North Africa are often collectively referred to as Sephardim together with Sephardim proper for liturgical reasons having to do with their prayer rites. A common term for many of these non-Spanish Jews who are sometimes still broadly grouped as Sephardim is Mizrahim (lit. 'easterners' in Hebrew). Nevertheless, Mizrahis and Sepharadim are usually ethnically distinct. Smaller groups include, but are not restricted to, Indian Jews such as the Bene Israel, Bnei Menashe, Cochin Jews, and Bene Ephraim; the Romaniotes of Greece; the Italian Jews ("Italkim" or "Bené Roma"); the Teimanim from Yemen; various African Jews, including most numerously the Beta Israel of Ethiopia; and Chinese Jews, most notably the Kaifeng Jews, as well as various other distinct but now almost extinct communities. The divisions between all these groups are approximate and their boundaries are not always clear. The Mizrahim for example, are a heterogeneous collection of North African, Central Asian, Caucasian, and Middle Eastern Jewish communities that are no closer related to each other than they are to any of the earlier mentioned Jewish groups. In modern usage, however, the Mizrahim are sometimes termed Sephardi due to similar styles of liturgy, despite independent development from Sephardim proper. Thus, among Mizrahim there are Egyptian Jews, Iraqi Jews, Lebanese Jews, Kurdish Jews, Moroccan Jews, Libyan Jews, Syrian Jews, Bukharian Jews, Mountain Jews, Georgian Jews, Iranian Jews, Afghan Jews, and various others. The Teimanim from Yemen are sometimes included, although their style of liturgy is unique and they differ in respect to the admixture found among them to that found in Mizrahim. In addition, there is a differentiation made between Sephardi migrants who established themselves in the Middle East and North Africa after the expulsion of the Jews from Spain and Portugal in the 1490s and the pre-existing Jewish communities in those regions. Ashkenazi Jews represent the bulk of modern Jewry, with at least 70 percent of Jews worldwide (and up to 90 percent prior to World War II and the Holocaust). As a result of their emigration from Europe, Ashkenazim also represent the overwhelming majority of Jews in the New World continents, in countries such as the United States, Canada, Argentina, Australia, and Brazil. In France, the immigration of Jews from Algeria (Sephardim) has led them to outnumber the Ashkenazim. Only in Israel is the Jewish population representative of all groups, a melting pot independent of each group's proportion within the overall world Jewish population. Y DNA studies tend to imply a small number of founders in an old population whose members parted and followed different migration paths. In most Jewish populations, these male line ancestors appear to have been mainly Middle Eastern. For example, Ashkenazi Jews share more common paternal lineages with other Jewish and Middle Eastern groups than with non-Jewish populations in areas where Jews lived in Eastern Europe, Germany, and the French Rhine Valley. This is consistent with Jewish traditions in placing most Jewish paternal origins in the region of the Middle East. Conversely, the maternal lineages of Jewish populations, studied by looking at mitochondrial DNA, are generally more heterogeneous. Scholars such as Harry Ostrer and Raphael Falk believe this indicates that many Jewish males found new mates from European and other communities in the places where they migrated in the diaspora after fleeing ancient Israel. In contrast, Behar has found evidence that about 40 percent of Ashkenazi Jews originate maternally from just four female founders, who were of Middle Eastern origin. The populations of Sephardi and Mizrahi Jewish communities "showed no evidence for a narrow founder effect." Subsequent studies carried out by Feder et al. confirmed the large portion of non-local maternal origin among Ashkenazi Jews. Reflecting on their findings related to the maternal origin of Ashkenazi Jews, the authors conclude "Clearly, the differences between Jews and non-Jews are far larger than those observed among the Jewish communities. Hence, differences between the Jewish communities can be overlooked when non-Jews are included in the comparisons." However, a 2025 genetic study on the Ashkenazi Jewish founder population supports the presence of a substantial Near Eastern component in the maternal lineages. Analyses of mitochondrial DNA (mtDNA) indicate that the core founder lineages, estimated at around 54, likely originated from the Near East, with these founder signatures appearing in multiple copies across the population. While later admixture introduced additional mtDNA lineages, these absorbed lineages are distinguishable from the original founders. The findings are consistent with genome-wide Identity-by-Descent and Lineage Extinction analyses, reinforcing the Near Eastern origin of the Ashkenazi maternal founders. A study showed that 7% of Ashkenazi Jews have the haplogroup G2c, which is mainly found in Pashtuns and on lower scales all major Jewish groups, Palestinians, Syrians, and Lebanese. Studies of autosomal DNA, which look at the entire DNA mixture, have become increasingly important as the technology develops. They show that Jewish populations have tended to form relatively closely related groups in independent communities, with most in a community sharing significant ancestry in common. For Jewish populations of the diaspora, the genetic composition of Ashkenazi, Sephardic, and Mizrahi Jewish populations show a predominant amount of shared Middle Eastern ancestry. According to Behar, the most parsimonious explanation for this shared Middle Eastern ancestry is that it is "consistent with the historical formulation of the Jewish people as descending from ancient Hebrew and Israelite residents of the Levant" and "the dispersion of the people of ancient Israel throughout the Old World". North African, Italian and others of Iberian origin show variable frequencies of admixture with non-Jewish historical host populations among the maternal lines. In the case of Ashkenazi and Sephardi Jews (in particular Moroccan Jews), who are closely related, the source of non-Jewish admixture is mainly Southern European, while Mizrahi Jews show evidence of admixture with other Middle Eastern populations. Behar et al. have remarked on a close relationship between Ashkenazi Jews and modern Italians. A 2001 study found that Jews were more closely related to groups of the Fertile Crescent (Kurds, Turks, and Armenians) than to their Arab neighbors, whose genetic signature was found in geographic patterns reflective of Islamic conquests. The studies also show that Sephardic Bnei Anusim (descendants of the "anusim" who were forced to convert to Catholicism), which comprise up to 19.8 percent of the population of today's Iberia (Spain and Portugal) and at least 10 percent of the population of Ibero-America (Hispanic America and Brazil), have Sephardic Jewish ancestry within the last few centuries. The Bene Israel and Cochin Jews of India, Beta Israel of Ethiopia, and a portion of the Lemba people of Southern Africa, despite more closely resembling the local populations of their native countries, have also been thought to have some more remote ancient Jewish ancestry. Views on the Lemba have changed and genetic Y-DNA analyses in the 2000s have established a partially Middle-Eastern origin for a portion of the male Lemba population but have been unable to narrow this down further. Although historically, Jews have been found all over the world, in the decades since World War II and the establishment of Israel, they have increasingly concentrated in a small number of countries. In 2021, Israel and the United States together accounted for over 85 percent of the global Jewish population, with approximately 45.3% and 39.6% of the world's Jews, respectively. More than half (51.2%) of world Jewry resides in just ten metropolitan areas. As of 2021, these ten areas were Tel Aviv, New York, Jerusalem, Haifa, Los Angeles, Miami, Philadelphia, Paris, Washington, and Chicago. The Tel Aviv metro area has the highest percent of Jews among the total population (94.8%), followed by Jerusalem (72.3%), Haifa (73.1%), and Beersheba (60.4%), the balance mostly being Israeli Arabs. Outside Israel, the highest percent of Jews in a metropolitan area was in New York (10.8%), followed by Miami (8.7%), Philadelphia (6.8%), San Francisco (5.1%), Washington (4.7%), Los Angeles (4.7%), Toronto (4.5%), and Baltimore (4.1%). As of 2010, there were nearly 14 million Jews around the world, roughly 0.2% of the world's population at the time. According to the 2007 estimates of The Jewish People Policy Planning Institute, the world's Jewish population is 13.2 million. This statistic incorporates both practicing Jews affiliated with synagogues and the Jewish community, and approximately 4.5 million unaffiliated and secular Jews.[citation needed] According to Sergio Della Pergola, a demographer of the Jewish population, in 2021 there were about 6.8 million Jews in Israel, 6 million in the United States, and 2.3 million in the rest of the world. Israel, the Jewish nation-state, is the only country in which Jews make up a majority of the citizens. Israel was established as an independent democratic and Jewish state on 14 May 1948. Of the 120 members in its parliament, the Knesset, as of 2016[update], 14 members of the Knesset are Arab citizens of Israel (not including the Druze), most representing Arab political parties. One of Israel's Supreme Court judges is also an Arab citizen of Israel. Between 1948 and 1958, the Jewish population rose from 800,000 to two million. Currently, Jews account for 75.4 percent of the Israeli population, or 6 million people. The early years of the State of Israel were marked by the mass immigration of Holocaust survivors in the aftermath of the Holocaust and Jews fleeing Arab lands. Israel also has a large population of Ethiopian Jews, many of whom were airlifted to Israel in the late 1980s and early 1990s. Between 1974 and 1979 nearly 227,258 immigrants arrived in Israel, about half being from the Soviet Union. This period also saw an increase in immigration to Israel from Western Europe, Latin America, and North America. A trickle of immigrants from other communities has also arrived, including Indian Jews and others, as well as some descendants of Ashkenazi Holocaust survivors who had settled in countries such as the United States, Argentina, Australia, Chile, and South Africa. Some Jews have emigrated from Israel elsewhere, because of economic problems or disillusionment with political conditions and the continuing Arab–Israeli conflict. Jewish Israeli emigrants are known as yordim. The waves of immigration to the United States and elsewhere at the turn of the 19th century, the founding of Zionism and later events, including pogroms in Imperial Russia (mostly within the Pale of Settlement in present-day Ukraine, Moldova, Belarus and eastern Poland), the massacre of European Jewry during the Holocaust, and the founding of the state of Israel, with the subsequent Jewish exodus from Arab lands, all resulted in substantial shifts in the population centers of world Jewry by the end of the 20th century. More than half of the Jews live in the Diaspora (see Population table). Currently, the largest Jewish community outside Israel, and either the largest or second-largest Jewish community in the world, is located in the United States, with 6 million to 7.5 million Jews by various estimates. Elsewhere in the Americas, there are also large Jewish populations in Canada (315,000), Argentina (180,000–300,000), and Brazil (196,000–600,000), and smaller populations in Mexico, Uruguay, Venezuela, Chile, Colombia and several other countries (see History of the Jews in Latin America). According to a 2010 Pew Research Center study, about 470,000 people of Jewish heritage live in Latin America and the Caribbean. Demographers disagree on whether the United States has a larger Jewish population than Israel, with many maintaining that Israel surpassed the United States in Jewish population during the 2000s, while others maintain that the United States still has the largest Jewish population in the world. Currently, a major national Jewish population survey is planned to ascertain whether or not Israel has overtaken the United States in Jewish population. Western Europe's largest Jewish community, and the third-largest Jewish community in the world, can be found in France, home to between 483,000 and 500,000 Jews, the majority of whom are immigrants or refugees from North African countries such as Algeria, Morocco, and Tunisia (or their descendants). The United Kingdom has a Jewish community of 292,000. In Eastern Europe, the exact figures are difficult to establish. The number of Jews in Russia varies widely according to whether a source uses census data (which requires a person to choose a single nationality among choices that include "Russian" and "Jewish") or eligibility for immigration to Israel (which requires that a person have one or more Jewish grandparents). According to the latter criteria, the heads of the Russian Jewish community assert that up to 1.5 million Russians are eligible for aliyah. In Germany, the 102,000 Jews registered with the Jewish community are a slowly declining population, despite the immigration of tens of thousands of Jews from the former Soviet Union since the fall of the Berlin Wall. Thousands of Israelis also live in Germany, either permanently or temporarily, for economic reasons. Prior to 1948, approximately 800,000 Jews were living in lands which now make up the Arab world (excluding Israel). Of these, just under two-thirds lived in the French-controlled Maghreb region, 15 to 20 percent in the Kingdom of Iraq, approximately 10 percent in the Kingdom of Egypt and approximately 7 percent in the Kingdom of Yemen. A further 200,000 lived in Pahlavi Iran and the Republic of Turkey. Today, around 26,000 Jews live in Muslim-majority countries, mainly in Turkey (14,200) and Iran (9,100), while Morocco (2,000), Tunisia (1,000), and the United Arab Emirates (500) host the largest communities in the Arab world. A small-scale exodus had begun in many countries in the early decades of the 20th century, although the only substantial aliyah came from Yemen and Syria. The exodus from Arab and Muslim countries took place primarily from 1948. The first large-scale exoduses took place in the late 1940s and early 1950s, primarily in Iraq, Yemen and Libya, with up to 90 percent of these communities leaving within a few years. The peak of the exodus from Egypt occurred in 1956. The exodus in the Maghreb countries peaked in the 1960s. Lebanon was the only Arab country to see a temporary increase in its Jewish population during this period, due to an influx of refugees from other Arab countries, although by the mid-1970s the Jewish community of Lebanon had also dwindled. In the aftermath of the exodus wave from Arab states, an additional migration of Iranian Jews peaked in the 1980s when around 80 percent of Iranian Jews left the country.[citation needed] Outside Europe, the Americas, the Middle East, and the rest of Asia, there are significant Jewish populations in Australia (112,500) and South Africa (70,000). There is also a 6,800-strong community in New Zealand. Since at least the time of the Ancient Greeks, a proportion of Jews have assimilated into the wider non-Jewish society around them, by either choice or force, ceasing to practice Judaism and losing their Jewish identity. Assimilation took place in all areas, and during all time periods, with some Jewish communities, for example the Kaifeng Jews of China, disappearing entirely. The advent of the Jewish Enlightenment of the 18th century (see Haskalah) and the subsequent emancipation of the Jewish populations of Europe and America in the 19th century, accelerated the situation, encouraging Jews to increasingly participate in, and become part of, secular society. The result has been a growing trend of assimilation, as Jews marry non-Jewish spouses and stop participating in the Jewish community. Rates of interreligious marriage vary widely: In the United States, it is just under 50 percent; in the United Kingdom, around 53 percent; in France, around 30 percent; and in Australia and Mexico, as low as 10 percent. In the United States, only about a third of children from intermarriages affiliate with Jewish religious practice. The result is that most countries in the Diaspora have steady or slightly declining religiously Jewish populations as Jews continue to assimilate into the countries in which they live.[citation needed] The Jewish people and Judaism have experienced various persecutions throughout their history. During Late Antiquity and the Early Middle Ages, the Roman Empire (in its later phases known as the Byzantine Empire) repeatedly repressed the Jewish population, first by ejecting them from their homelands during the pagan Roman era and later by officially establishing them as second-class citizens during the Christian Roman era. According to James Carroll, "Jews accounted for 10% of the total population of the Roman Empire. By that ratio, if other factors had not intervened, there would be 200 million Jews in the world today, instead of something like 13 million." Later in medieval Western Europe, further persecutions of Jews by Christians occurred, notably during the Crusades—when Jews all over Germany were massacred—and in a series of expulsions from the Kingdom of England, Germany, and France. Then there occurred the largest expulsion of all, when Spain and Portugal, after the Reconquista (the Catholic Reconquest of the Iberian Peninsula), expelled both unbaptized Sephardic Jews and the ruling Muslim Moors. In the Papal States, which existed until 1870, Jews were required to live only in specified neighborhoods called ghettos. Islam and Judaism have a complex relationship. Traditionally Jews and Christians living in Muslim lands, known as dhimmis, were allowed to practice their religions and administer their internal affairs, but they were subject to certain conditions. They had to pay the jizya (a per capita tax imposed on free adult non-Muslim males) to the Islamic state. Dhimmis had an inferior status under Islamic rule. They had several social and legal disabilities such as prohibitions against bearing arms or giving testimony in courts in cases involving Muslims. Many of the disabilities were highly symbolic. The one described by Bernard Lewis as "most degrading" was the requirement of distinctive clothing, not found in the Quran or hadith but invented in early medieval Baghdad; its enforcement was highly erratic. On the other hand, Jews rarely faced martyrdom or exile, or forced compulsion to change their religion, and they were mostly free in their choice of residence and profession. Notable exceptions include the massacre of Jews and forcible conversion of some Jews by the rulers of the Almohad dynasty in Al-Andalus in the 12th century, as well as in Islamic Persia, and the forced confinement of Moroccan Jews to walled quarters known as mellahs beginning from the 15th century and especially in the early 19th century. In modern times, it has become commonplace for standard antisemitic themes to be conflated with anti-Zionist publications and pronouncements of Islamic movements such as Hezbollah and Hamas, in the pronouncements of various agencies of the Islamic Republic of Iran, and even in the newspapers and other publications of Turkish Refah Partisi."[better source needed] Throughout history, many rulers, empires and nations have oppressed their Jewish populations or sought to eliminate them entirely. Methods employed ranged from expulsion to outright genocide; within nations, often the threat of these extreme methods was sufficient to silence dissent. The history of antisemitism includes the First Crusade which resulted in the massacre of Jews; the Spanish Inquisition (led by Tomás de Torquemada) and the Portuguese Inquisition, with their persecution and autos-da-fé against the New Christians and Marrano Jews; the Bohdan Chmielnicki Cossack massacres in Ukraine; the Pogroms backed by the Russian Tsars; as well as expulsions from Spain, Portugal, England, France, Germany, and other countries in which the Jews had settled. According to a 2008 study published in the American Journal of Human Genetics, 19.8 percent of the modern Iberian population has Sephardic Jewish ancestry, indicating that the number of conversos may have been much higher than originally thought. The persecution reached a peak in Nazi Germany's Final Solution, which led to the Holocaust and the slaughter of approximately 6 million Jews. Of the world's 16 million Jews in 1939, almost 40% were murdered in the Holocaust. The Holocaust—the state-led systematic persecution and genocide of European Jews (and certain communities of North African Jews in European controlled North Africa) and other minority groups of Europe during World War II by Germany and its collaborators—remains the most notable modern-day persecution of Jews. The persecution and genocide were accomplished in stages. Legislation to remove the Jews from civil society was enacted years before the outbreak of World War II. Concentration camps were established in which inmates were used as slave labour until they died of exhaustion or disease. Where the Third Reich conquered new territory in Eastern Europe, specialized units called Einsatzgruppen murdered Jews and political opponents in mass shootings. Jews and Roma were crammed into ghettos before being transported hundreds of kilometres by freight train to extermination camps where, if they survived the journey, the majority of them were murdered in gas chambers. Virtually every arm of Germany's bureaucracy was involved in the logistics of the mass murder, turning the country into what one Holocaust scholar has called "a genocidal nation." Throughout Jewish history, Jews have repeatedly been directly or indirectly expelled from both their original homeland, the Land of Israel, and many of the areas in which they have settled. This experience as refugees has shaped Jewish identity and religious practice in many ways, and is thus a major element of Jewish history. In summary, the pogroms in Eastern Europe, the rise of modern antisemitism, the Holocaust, as well as the rise of Arab nationalism, all served to fuel the movements and migrations of huge segments of Jewry from land to land and continent to continent until they arrived back in large numbers at their original historical homeland in Israel. In the Bible, the patriarch Abraham is described as a migrant to the land of Canaan from Ur of the Chaldees. His descendants, the Children of Israel, undertook the Exodus (meaning "departure" or "exit" in Greek) from ancient Egypt, as described in the Book of Exodus. The first movement documented in the historical record occurred with the resettlement policy of the Neo-Assyrian Empire, which mandated the deportation of conquered peoples, and it is estimated some 4,500,000 among its captive populations suffered this dislocation over three centuries of Assyrian rule. With regard to Israel, Tiglath-Pileser III claims he deported 80% of the population of Lower Galilee, some 13,520 people. Some 27,000 Israelites, 20 to 25% of the population of the Kingdom of Israel, were described as being deported by Sargon II, and were replaced by other deported populations and sent into permanent exile by Assyria, initially to the Upper Mesopotamian provinces of the Assyrian Empire. Between 10,000 and 80,000 people from the Kingdom of Judah were similarly exiled by Babylonia, but these people were then returned to Judea by Cyrus the Great of the Persian Achaemenid Empire. Many Jews were exiled again by the Roman Empire. The 2,000 year dispersion of the Jewish diaspora beginning under the Roman Empire, as Jews were spread throughout the Roman world and, driven from land to land, settled wherever they could live freely enough to practice their religion. Over the course of the diaspora the center of Jewish life moved from Babylonia to the Iberian Peninsula to Poland to the United States and, as a result of Zionism, back to Israel. There were also many expulsions of Jews during the Middle Ages and Enlightenment in Europe, including: 1290, 16,000 Jews were expelled from England, (see the Statute of Jewry); in 1396, 100,000 from France; in 1421, thousands were expelled from Austria. Many of these Jews settled in East-Central Europe, especially Poland. Following the Spanish Inquisition in 1492, the Spanish population of around 200,000 Sephardic Jews were expelled by the Spanish crown and Catholic church, followed by expulsions in 1493 in Sicily (37,000 Jews) and Portugal in 1496. The expelled Jews fled mainly to the Ottoman Empire, the Netherlands, and North Africa, others migrating to Southern Europe and the Middle East. During the 19th century, France's policies of equal citizenship regardless of religion led to the immigration of Jews (especially from Eastern and Central Europe). This contributed to the arrival of millions of Jews in the New World. Over two million Eastern European Jews arrived in the United States from 1880 to 1925. In the latest phase of migrations, the Islamic Revolution of Iran caused many Iranian Jews to flee Iran. Most found refuge in the US (particularly Los Angeles, California, and Long Island, New York) and Israel. Smaller communities of Persian Jews exist in Canada and Western Europe. Similarly, when the Soviet Union collapsed, many of the Jews in the affected territory (who had been refuseniks) were suddenly allowed to leave. This produced a wave of migration to Israel in the early 1990s. Israel is the only country with a Jewish population that is consistently growing through natural population growth, although the Jewish populations of other countries, in Europe and North America, have recently increased through immigration. In the Diaspora, in almost every country the Jewish population in general is either declining or steady, but Orthodox and Haredi Jewish communities, whose members often shun birth control for religious reasons, have experienced rapid population growth. Orthodox and Conservative Judaism discourage proselytism to non-Jews, but many Jewish groups have tried to reach out to the assimilated Jewish communities of the Diaspora in order for them to reconnect to their Jewish roots. Additionally, while in principle Reform Judaism favours seeking new members for the faith, this position has not translated into active proselytism, instead taking the form of an effort to reach out to non-Jewish spouses of intermarried couples. There is also a trend of Orthodox movements reaching out to secular Jews in order to give them a stronger Jewish identity so there is less chance of intermarriage. As a result of the efforts by these and other Jewish groups over the past 25 years, there has been a trend (known as the Baal teshuva movement) for secular Jews to become more religiously observant, though the demographic implications of the trend are unknown. Additionally, there is also a growing rate of conversion to Jews by Choice of gentiles who make the decision to head in the direction of becoming Jews. Contributions Jewish individuals have played a significant role in the development and growth of Western culture, advancing many fields of thought, science and technology, both historically and in modern times, including through discrete trends in Jewish philosophy, Jewish ethics and Jewish literature, as well as specific trends in Jewish culture, including in Jewish art, Jewish music, Jewish humor, Jewish theatre, Jewish cuisine and Jewish medicine. Jews have established various Jewish political movements, religious movements, and, through the authorship of the Hebrew Bible and parts of the New Testament, provided the foundation for Christianity and Islam. More than 20 percent of the awarded Nobel Prize have gone to individuals of Jewish descent. Philanthropic giving is a widespread core function among Jewish organizations. Notes References External links |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/History_of_Israel#Early_Israelites_(Iron_Age_I)] | [TOKENS: 14912] |
Contents History of Israel The history of Israel covers the Southern Levant region also known as Canaan, Palestine, or the Holy Land, which is the location of Israel and Palestine. From prehistory, as part of the Levantine corridor, the area witnessed waves of early humans from Africa, then the emergence of Natufian culture c. 10,000 BCE. The region entered the Bronze Age c. 2,000 BCE with the development of Canaanite civilization. In the Iron Age, the kingdoms of Israel and Judah were established, entities central to the origins of the Abrahamic religions. This has given rise to Judaism, Samaritanism, Christianity, Islam, Druzism, Baha'ism. The Land of Israel has seen many conflicts, been controlled by various polities, and hosted various ethnic groups. In the following centuries, the Assyrian, Babylonian, Achaemenid, and Macedonian empires conquered the region. Ptolemies and Seleucids vied for control during the Hellenistic period. Through the Hasmonean dynasty, the Jews maintained independence for a century before incorporation into the Roman Republic. As a result of the Jewish–Roman wars in the 1st and 2nd centuries CE, many Jews were killed, or sold into slavery. Following the advent of Christianity, demographics shifted towards newfound Christians, who replaced Jews as the majority by the 4th century. In the 7th century, Byzantine Christian rule over Israel was superseded in the Muslim conquest of the Levant by the Rashidun Caliphate, to later be ruled by the Umayyad, Abbasid, and Fatimid caliphates, before being conquered by the Seljuks in the 1070s. Throughout the 12th and 13th centuries, the Land of Israel saw wars between Christians and Muslims as part of the Crusades, with the Kingdom of Jerusalem overrun by Saladin's Ayyubids in the 12th century. The Crusaders hung on to decreasing territories for another century. In the 13th century, the Land of Israel became subject to Mongol conquest, though this was stopped by the Mamluk Sultanate, under whose rule it remained until the 16th century. The Mamluks were defeated by the Ottoman Empire, and the region became an Ottoman province until the early 20th century. The 19th century saw the rise of a Jewish nationalist movement in Europe known as Zionism; aliyah, Jewish immigration to Israel from the diaspora, increased. During World War I, the Sinai and Palestine campaign of the Allies led to the partition of the Ottoman Empire. Britain was granted control of the region by a League of Nations mandate, known as Mandatory Palestine. The British committed to the creation of a Jewish homeland in the 1917 Balfour Declaration. Palestinian Arabs sought to prevent Jewish immigration, and tensions grew during British administration. In 1947, the UN voted for the partition of Mandate Palestine and creation of a Jewish and Arab state. The Jews accepted the plan, while the Arabs rejected it. A civil war ensued, won by the Jews. In May 1948, the Israeli Declaration of Independence sparked the 1948 War in which Israel repelled the armies of the neighbouring states. It resulted in the 1948 Palestinian expulsion and flight and led to Jewish emigration from other parts of the Middle East. About 40% of the global Jewish population resides in Israel. In 1979, the Egypt–Israel peace treaty was signed. In 1993, Israel signed the Oslo I Accord with the Palestine Liberation Organization, which was followed by the establishment of the Palestinian Authority. In 1994, the Israel–Jordan peace treaty was signed. Despite a long-running Israeli–Palestinian peace process, the conflict continues. Prehistory The oldest evidence of early humans in the territory of modern Israel, dating to 1.5 million years ago, was found in Ubeidiya near the Sea of Galilee. Flint tool artefacts have been discovered at Yiron, the oldest stone tools found anywhere outside Africa.[dubious – discuss] The Daughters of Jacob Bridge over the Jordan River provides evidence of the control of fire by early humans around 780,000 years ago, one of the oldest known examples. In the Mount Carmel area at el-Tabun, and Es Skhul, Neanderthal and early modern human remains were found, showing the longest stratigraphic record in the region, spanning 600,000 years of human activity, from the Lower Paleolithic to the present day, representing roughly a million years of human evolution. Other significant Paleolithic sites include Qesem cave. A 200,000-year-old fossil from Misliya Cave is the second-oldest evidence of anatomically modern humans found outside Africa. Other notable finds include the Skhul and Qafzeh hominins, as well as Manot 1. Around 10th millennium BCE, the Natufian culture existed in the area. The beginning of agriculture in the region during the Neolithic Revolution is evidenced by sites such as Nahal Oren and Gesher. Here is one of the more common periodisations. Bronze Age Canaan The Canaanites are archaeologically attested in the Middle Bronze Age (2100–1550 BCE). There were probably independent or semi-independent city-states. Cities were often surrounded by massive earthworks, resulting in the archaeological mounds, or 'tells' common in the region today. In the late Middle Bronze Age, the Nile Delta in Egypt was settled by Canaanites who maintained close connections with Canaan. During that period, the Hyksos, dynasties of Canaanite/Asiatic origin, ruled much of Lower Egypt before being overthrown in the 16th century BCE. During the Late Bronze Age (1550–1200 BCE), there were Canaanite vassal states paying tribute to the New Kingdom of Egypt, which governed from Gaza. In 1457 BCE, Egyptian forces under the command of Pharaoh Thutmose III defeated a rebellious coalition of Canaanite vassal states led by Kadesh's king at the Battle of Megiddo. In the Late Bronze Age there was a period of civilizational collapse in the Middle East, Canaan fell into chaos, and Egyptian control ended. There is evidence that urban centers such as Hazor, Beit She'an, Megiddo, Ekron, Isdud and Ascalon were damaged or destroyed. Two groups appear at this time, and are associated with the transition to the Iron Age (they used iron weapons/tools which were better than earlier bronze): the Sea Peoples, particularly the Philistines, who migrated from the Aegean world and settled on the southern coast, and the Israelites, whose settlements dotted the highlands. Some 2nd millennium inscriptions about the semi-nomadic Habiru people are believed to be connected to the Hebrews, who were generally synonymous with the Biblical Israelites. Many scholars regard this connection to be plausible since the two ethnonyms have similar etymologies, although others argue that Habiru refers to a social class found in every Near Eastern society, including Hebrew societies. Ancient Israel and Judah: Iron Age to Babylonian period The earliest recorded evidence of a people by the name of Israel (as ysrỉꜣr) occurs in the Egyptian Merneptah Stele, erected for Pharaoh Merneptah c. 1209 BCE. Archeological evidence indicates that during the early Iron Age I, hundreds of small villages were established on the highlands of Canaan on both sides of the Jordan River, primarily in Samaria, north of Jerusalem. These villages had populations of up to 400, were largely self-sufficient and lived from herding, grain cultivation, and growing vines and olives with some economic interchange. The pottery was plain and undecorated. Writing was known and available for recording, even in small sites. William G. Dever sees this "Israel" in the central highlands as a cultural and probably political entity, more an ethnic group rather than an organized state. Modern scholars believe that the Israelites and their culture branched out of the Canaanite peoples and their cultures through the development of a distinct monolatristic—and later monotheistic—religion centred on a national god Yahweh. According to McNutt, "It is probably safe to assume that sometime during Iron Age I a population began to identify itself as 'Israelite'", differentiating itself from the Canaanites through such markers as the prohibition of intermarriage, an emphasis on family history and genealogy, and religion. Philistine cooking tools and the prevalence of pork in their diets, and locally made Mycenaean pottery—which later evolved into bichrome Philistine pottery—all support their foreign origin. Their cities were large and elaborate, which—together with the findings—point to a complex, hierarchical society. Israel Finkelstein believes that the oldest Abraham traditions originated in the Iron Age, which focus on the themes of land and offspring and possibly, his altars in Hebron. Abraham's Mesopotamian heritage is not discussed. In the 10th century BCE, the Israelite kingdoms of Judah and Israel emerged. The Hebrew Bible states that these were preceded by a single kingdom ruled by Saul, David and Solomon, who is said to have built the First Temple. Archaeologists have debated whether the united monarchy ever existed,[Notes 1] with those in favor of such a polity existing further divided between maximalists who support the Biblical accounts, and minimalists who argue that any such polity was likely smaller than suggested. Historians and archaeologists agree that the northern Kingdom of Israel existed by ca. 900 BCE and the Kingdom of Judah existed by ca. 850 BCE. The Kingdom of Israel was the more prosperous of the two kingdoms and soon developed into a regional power; during the days of the Omride dynasty, it controlled Samaria, Galilee, the upper Jordan Valley, the Sharon and large parts of the Transjordan. Samaria, the capital, was home to one of the largest Iron Age structures in the Levant. The Kingdom of Israel's capital moved between Shechem, Penuel and Tirzah before Omri settled it in Samaria, and the royal succession was often settled by a military coup d'état. The Kingdom of Judah was smaller but more stable; the Davidic dynasty ruled the kingdom for the four centuries of its existence, with the capital always in Jerusalem, controlling the Judaean Mountains, most of the Shephelah and the Beersheba valley in the northern Negev. In 854 BCE, according to the Kurkh Monoliths, an alliance between Ahab of Israel and Ben Hadad II of Aram-Damascus managed to repulse the incursions of the Assyrians, with a victory at the Battle of Qarqar. Another important discovery of the period is the Mesha Stele, a Moabite stele found in Dhiban when Emir Sattam Al-Fayez led Henry Tristram to it as they toured the lands of the vassals of the Bani Sakher. The stele is now in the Louvre. In the stele, Mesha, king of Moab, tells how Chemosh, the god of Moab, had been angry with his people and had allowed them to be subjugated to the Kingdom of Israel, but at length, Chemosh returned and assisted Mesha to throw off the yoke of Israel and restore the lands of Moab. It refers to Omri, king of Israel, to the god Yahweh, and may contain another early reference to the House of David. The Kingdom of Israel fell to the Assyrians following a long siege of the capital Samaria around 720 BCE. The records of Sargon II indicate that he captured Samaria and deported 27,290 inhabitants to Mesopotamia. It is likely that Shalmaneser captured the city since both the Babylonian Chronicles and the Hebrew Bible viewed the fall of Israel as the signature event of his reign. The Assyrian deportations became the basis for the Jewish idea of the Ten Lost Tribes. Foreign groups were settled by the Assyrians in the territories of the fallen kingdom. The Samaritans claim to be descended from Israelites of ancient Samaria who were not expelled by the Assyrians. It is believed that refugees from the destruction of Israel moved to Judah, massively expanding Jerusalem and leading to construction of the Siloam Tunnel during the rule of King Hezekiah (ruled 715–686 BCE). The Siloam inscription, a plaque written in Hebrew left by the construction team, was discovered in the tunnel in 1880s, and is today held by the Istanbul Archaeology Museum. During Hezekiah's rule, Sennacherib, the son of Sargon, attempted but failed to capture Judah. Assyrian records say that Sennacherib levelled 46 walled cities and besieged Jerusalem, leaving after receiving extensive tribute. Sennacherib erected the Lachish reliefs in Nineveh to commemorate a second victory at Lachish. The writings of four different "prophets" are believed to date from this period: Hosea and Amos in Israel and Micah and Isaiah of Judah. These men were mostly social critics who warned of the Assyrian threat and acted as religious spokesmen. They exercised some form of free speech and may have played a significant social and political role in Israel and Judah. They urged rulers and the general populace to adhere to god-conscious ethical ideals, seeing the Assyrian invasions as a divine punishment of the collective resulting from ethical failures. Under King Josiah (ruler from 641 to 619 BCE), the Book of Deuteronomy was either rediscovered or written. The Book of Joshua and the accounts of the kingship of David and Solomon in the Book of Kings are believed to have the same author. The books are known as Deuteronomist and considered to be a key step in the emergence of monotheism in Judah. They emerged at a time that Assyria was weakened by the emergence of Babylon and may be a committing to text of pre-writing verbal traditions. During the late 7th century BCE, Judah became a vassal state of the Neo-Babylonian Empire. In 601 BCE, Jehoiakim of Judah allied with Babylon's principal rival, Egypt, despite the strong remonstrances of the prophet Jeremiah. As a punishment, the Babylonians besieged Jerusalem in 597 BCE, and the city surrendered. The defeat was recorded by the Babylonians. Nebuchadnezzar pillaged Jerusalem and deported king Jechoiachin (Jeconiah), along with other prominent citizens, to Babylon; Zedekiah, his uncle, was installed as king. A few years later, Zedekiah launched another revolt against Babylon, and an army was sent to conquer Jerusalem. In 587 or 586 BCE, King Nebuchadnezzar II of Babylon conquered Jerusalem, destroyed the First Temple and razed the city. The Kingdom of Judah was abolished, and many of its citizens were exiled to Babylon. The former territory of Judah became a Babylonian province called Yehud with its center in Mizpah, north of the destroyed Jerusalem. Tablets that describe King Jehoiachin's rations were found in the ruins of Babylon. He was eventually released by the Babylonians. According to both the Bible and the Talmud, the Davidic dynasty continued as head of Babylonian Jewry, called the "Rosh Galut" (exilarch or head of exile). Arab and Jewish sources show that the Rosh Galut continued to exist for another 1,500 years in what is now Iraq, ending in the eleventh century. Second Temple period In 538 BCE, Cyrus the Great of the Achaemenid Empire conquered Babylon and took over its empire. Cyrus issued a proclamation granting religious freedom to all peoples subjugated by the Babylonians (see the Cyrus Cylinder). According to the Bible, Jewish exiles in Babylon, including 50,000 Judeans led by Zerubabel, returned to Judah to rebuild the Temple in Jerusalem. The Second Temple was subsequently completed c. 515 BCE. A second group of 5,000, led by Ezra and Nehemiah, returned to Judah in 456 BCE. The first was empowered by the Persian king to enforce religious rules, the second had the status of governor and a royal mission to restore the walls of the city. The country remained a province of the Achaemenid empire called Yehud until 332 BCE. The final text of the Torah is thought to have been written during the Persian period (probably 450–350 BCE). The text was formed by editing and unifying earlier texts. The returning Israelites adopted an Aramaic script (also known as the Ashuri alphabet), which they brought back from Babylon; this is the current Hebrew script. The Hebrew calendar closely resembles the Babylonian calendar and probably dates from this period. The Bible describes tension between the returnees, the elite of the First Temple period, and those who had remained in Judah. It is possible that the returnees, supported by the Persian monarchy, became large landholders at the expense of the people who had remained to work the land in Judah, whose opposition to the Second Temple would have reflected a fear that exclusion from the cult would deprive them of land rights. Judah had become in practice a theocracy, ruled by hereditary High Priests and a Persian-appointed governor, frequently Jewish, charged with keeping order and seeing that tribute was paid. A Judean military garrison was placed by the Persians on Elephantine Island near Aswan in Egypt. In the early 20th century, 175 papyrus documents recording activity in this community were discovered, including the "Passover Papyrus", a letter instructing the garrison on how to correctly conduct the Passover feast. In 332 BCE, Alexander the Great of Macedon conquered the region as part of his campaign against the Achaemenid Empire. After his death in 322 BCE, his generals divided the empire and Judea became a frontier region between the Seleucid Empire and Ptolemaic Kingdom in Egypt. Following a century of Ptolemaic rule, Judea was conquered by the Seleucid Empire in 200 BCE at the battle of Panium. Hellenistic rulers generally respected Jewish culture and protected Jewish institutions. Judea was ruled by the hereditary office of the High Priest of Israel as a Hellenistic vassal. Nevertheless, the region underwent a process of Hellenization, which heightened tensions between Greeks, Hellenized Jews, and observant Jews. These tensions escalated into clashes involving a power struggle for the position of high priest and the character of the holy city of Jerusalem. When Antiochus IV Epiphanes consecrated the temple, forbade Jewish practices, and forcibly imposed Hellenistic norms on the Jews, several centuries of religious tolerance under Hellenistic control came to an end. In 167 BCE, the Maccabean revolt erupted after Mattathias, a Jewish priest of the Hasmonean lineage, killed a Hellenized Jew and a Seleucid official who participated in sacrifice to the Greek gods in Modi'in. His son Judas Maccabeus defeated the Seleucids in several battles, and in 164 BCE, he captured Jerusalem and restored temple worship, an event commemorated by the Jewish festival of Hannukah. After Judas' death, his brothers Jonathan Apphus and Simon Thassi were able to establish and consolidate a vassal Hasmonean state in Judea, capitalizing on the Seleucid Empire's decline as a result of internal instability and wars with the Parthians, and by forging ties with the rising Roman Republic. Hasmonean leader John Hyrcanus was able to gain independence, doubling Judea's territories. He took control of Idumaea, where he converted the Edomites to Judaism, and invaded Scythopolis and Samaria, where he demolished the Samaritan Temple. Hyrcanus was also the first Hasmonean leader to mint coins. Under his sons, kings Aristobulus I and Alexander Jannaeus, Hasmonean Judea became a kingdom, and its territories continued to expand, now also covering the coastal plain, Galilee and parts of the Transjordan. Some scholars argue that the Hasmonean dynasty also institutionalized the final Jewish biblical canon. Under Hasmonean rule, the Pharisees, Sadducees and the mystic Essenes emerged as the principal Jewish social movements. The Pharisee sage Simeon ben Shetach is credited with establishing the first schools based around meeting houses. This was a key step in the emergence of Rabbinical Judaism. After Jannaeus' widow, queen Salome Alexandra, died in 67 BCE, her sons Hyrcanus II and Aristobulus II engaged in a civil war over succession. The conflicting parties requested Pompey's assistance on their behalf, which paved the way for a Roman takeover of the kingdom. In 63 BCE, the Roman Republic conquered Judaea, ending Jewish independence under the Hasmoneans. Roman general Pompey intervened in a dynastic civil war and, after capturing Jerusalem, reinstated Hyrcanus II as high priest but denied him the title of king. Rome soon installed the Herodian dynasty—of Idumean descent but Jewish by conversion—as a loyal replacement for the nationalist Hasmoneans. In 37 BCE, Herod the Great, the first client king of this line, took power after defeating the restored Hasmonean king Antigonus II Mattathias. Herod imposed heavy taxes, suppressed opposition, and centralized authority, which fostered widespread resentment. Herod also carried out major monumental construction projects throughout his kingdom, and significantly expanded the Second Temple, which he transformed into one of the largest religious structures in the ancient world. After his death in 4 BCE, his kingdom was divided among his sons into a tetrarchy under continued Roman oversight. In 6 CE, Roman emperor Augustus transformed Judaea into a Roman province, deposing its last Jewish ruler, Herod Archelaus, and appointing a Roman governor in his place. That same year, a census triggered a small uprising by Judas of Galilee, the founder of a movement that rejected foreign authority and recognized only God as king. Over the next six decades, with the brief exception of a short period of Jewish autonomy under the client king Herod Agrippa I, the province remained under direct Roman administration. Some governors ruled with brutality and showed little regard for Jewish religious sensitivities, deepening resentment among the local population. This discontent was also fueled by poor governance, corruption, and growing economic inequality, along with rising tensions between Jews and neighboring populations over ethnic, religious, and territorial disputes. At the same time, collective memory of the Maccabean revolt and the period of Hasmonean independence continued to inspire hopes for national liberation from Roman control. In 64 CE, the Temple High Priest Joshua ben Gamla introduced a religious requirement for Jewish boys to learn to read from the age of six. Over the next few hundred years this requirement became steadily more ingrained in Jewish tradition. The Jewish–Roman wars were a series of large-scale revolts by Jewish subjects against the Roman Empire between 66 and 135 CE. The term primarily applies to the First Jewish–Roman War (66–73 CE) and the Bar Kokhba revolt (132–136 CE), both nationalist rebellions aimed at restoring Jewish independence in Judea. Some sources also include the Diaspora Revolt (115–117 CE), an ethno-religious conflict fought across the Eastern Mediterranean and including the Kitos War in Judaea. The Jewish–Roman wars had a devastating impact on the Jewish people, transforming them from a major population in the Eastern Mediterranean into a dispersed and persecuted minority. The First Jewish-Roman War culminated in the destruction of Jerusalem and other towns and villages in Judaea, resulting in significant loss of life and a considerable segment of the population being uprooted or displaced. Those who remained were stripped of any form of political autonomy. Subsequently, the brutal suppression of the Bar Kokhba revolt resulted in even more severe consequences. Judea witnessed a significant depopulation, as many Jews were killed, expelled, or sold into slavery. The outcome of the conflict marked the termination of efforts to reestablish a Jewish state until the modern era. Jews were banned from residing in the vicinity of Jerusalem, which the Romans rebuilt into the pagan colony of Aelia Capitolina, and the province of Judaea was renamed Syria Palaestina. Collectively, these events enhanced the role of Jewish diaspora, relocating the Jewish demographic and cultural center to Galilee and eventually to Babylonia, with smaller communities across the Mediterranean, the Middle East, and beyond. The Jewish–Roman wars also had a major impact on Judaism, after the central worship site of Second Temple Judaism, the Second Temple in Jerusalem, was destroyed by Titus's troops in 70 CE. The destruction of the Temple led to a transformation in Jewish religious practices, emphasizing prayer, Torah study, and communal gatherings in synagogues. This pivotal shift laid the foundation for the emergence of Rabbinic Judaism, which has been the dominant form of Judaism since late antiquity, after the codification of the Babylonian Talmud. Late Roman and Byzantine periods As a result of the disastrous effects of the Bar Kokhba revolt, Jewish presence in the region significantly dwindled. Over the next centuries, more Jews left to communities in the Diaspora, especially the large, speedily growing Jewish communities in Babylonia and Arabia. Others remained in the Land of Israel, where the spiritual and demographic center shifted from the depopulated Judea to Galilee. Jewish presence also continued in the southern Hebron Hills, in Ein Gedi, and on the coastal plain. The Mishnah and the Jerusalem Talmud, huge compendiums of Rabbinical discussions, were compiled during the 2nd to 4th centuries CE in Tiberias and Jerusalem. Following the revolt, Judea's countryside was penetrated by pagan populations, including migrants from the nearby provinces of Syria, Phoenicia, and Arabia, whereas Aelia Capitolina, its immediate vicinity, and administrative centers were now inhabited by Roman veterans and settlers from the western parts of the empire. The Romans permitted a hereditary Rabbinical Patriarch from the House of Hillel, called the "Nasi", to represent the Jews in dealings with the Romans. One prominent figure was Judah ha-Nasi, credited with compiling the final version of the Mishnah, a vast collection of Jewish oral traditions. He also emphasized the importance of education in Judaism, leading to requirements that illiterate Jews be treated as outcasts. This might have contributed to some illiterate Jews converting to Christianity. Jewish seminaries, such as those at Shefaram and Bet Shearim, continued to produce scholars. The best of these became members of the Sanhedrin, which was located first at Sepphoris and later at Tiberias. In the Galillee, many synagogues have been found dating from this period, and the burial site of the Sanhedrin leaders was discovered in Beit She'arim. In the 3rd century, the Roman Empire faced an economic crisis and imposed heavy taxation to fund wars of imperial succession. This situation prompted additional Jewish migration from Syria Palaestina to the Sasanian Empire, known for its more tolerant environment; there, a flourishing Jewish community with important Talmudic academies thrived in Babylonia, engaging in a notable rivalry with the Talmudic academies of Palaestina. Early in the 4th century, the Emperor Constantine made Constantinople the capital of the East Roman Empire and made Christianity an accepted religion. His mother Helena made a pilgrimage to Jerusalem (326–328) and led the construction of the Church of the Nativity (birthplace of Jesus in Bethlehem), the Church of the Holy Sepulchre (burial site of Jesus in Jerusalem) and other key churches that still exist. The name Jerusalem was restored to Aelia Capitolina and became a Christian city. Jews were still banned from living in Jerusalem, but were allowed to visit and worship at the site of the ruined temple. Over the course of the next century Christians worked to eradicate "paganism", leading to the destruction of classical Roman traditions and eradication of their temples. In 351–2, another Jewish revolt in the Galilee erupted against a corrupt Roman governor. The Roman Empire split in 390 CE and the region became part of the Eastern Roman Empire, known as the Byzantine Empire. Under Byzantine rule, much of the region and its non-Jewish population were won over by Christianity, which eventually became the dominant religion in the region. The presence of holy sites drew Christian pilgrims, some of whom chose to settle, contributing to the rise of a Christian majority. Christian authorities encouraged this pilgrimage movement and appropriated lands, constructing magnificent churches at locations linked to biblical narratives. Additionally, monks established monasteries near pagan settlements, encouraging the conversion of local pagans. During the Byzantine period, the Jewish presence in the region declined, and it is believed that Jews lost their majority status in Palestine in the fourth century. While Judaism remained the sole non-Christian religion tolerated, restrictions on Jews gradually increased, prohibiting the construction of new places of worship, holding public office, or owning Christian slaves. In 425, after the death of the last Nasi, Gamliel VI, the Nasi office and the Sanhedrin were officially abolished, and the standing of yeshivot weakened. The leadership void was gradually filled by the Jewish center in Babylonia, which would assume a leading role in the Jewish world for generations after the Byzantine period. During the 5th and 6th centuries CE, the region witnessed a series of Samaritan revolts against Byzantine rule. Their suppression resulted in the decline of Samaritan presence and influence, and further consolidated Christian domination. Though it is acknowledged that some Jews and Samaritans converted to Christianity during the Byzantine period, the reliable historical records are limited, and they pertain to individual conversions rather than entire communities. In 611, Khosrow II, ruler of Sassanid Persia, invaded the Byzantine Empire. He was helped by Jewish fighters recruited by Benjamin of Tiberias and captured Jerusalem in 614. The "True Cross" was captured by the Persians. The Jewish Himyarite Kingdom in Yemen may also have provided support. Nehemiah ben Hushiel was made governor of Jerusalem. Christian historians of the period claimed the Jews massacred Christians in the city, but there is no archeological evidence of destruction, leading modern historians to question their accounts. In 628, Kavad II (son of Kosrow) returned Palestine and the True Cross to the Byzantines and signed a peace treaty with them. Following the Byzantine re-entry, Heraclius massacred the Jewish population of Galilee and Jerusalem, while renewing the ban on Jews entering the latter. Early Muslim period The Levant was conquered by an Arab army under the command of ʿUmar ibn al-Khaṭṭāb in 635, and became the province of Bilad al-Sham of the Rashidun Caliphate. Two military districts—Jund Filastin and Jund al-Urdunn—were established in Palestine. A new city called Ramlah was built as the Muslim capital of Jund Filastin, while Tiberias served as the capital of Jund al-Urdunn. The Byzantine ban on Jews living in Jerusalem came to an end. In 661, Mu'awiya I was crowned Caliph in Jerusalem, becoming the first of the (Damascus-based) Umayyad dynasty. In 691, Umayyad Caliph Abd al-Malik (685–705) constructed the Dome of the Rock shrine on the Temple Mount, where the two Jewish temples had been located. A second building, the Al-Aqsa Mosque, was also erected on the Temple Mount in 705. Both buildings were rebuilt in the 10th century following a series of earthquakes. In 750, Arab discrimination against non-Arab Muslims led to the Abbasid Revolution and the Umayyads were replaced by the Abbasid Caliphs who built a new city, Baghdad, to be their capital. This period is known as the Islamic Golden Age, the Arab Empire was the largest in the world and Baghdad the largest and richest city. Both Arabs and minorities prospered across the region and much scientific progress was made. There were however setbacks: During the 8th century, the Caliph Umar II introduced a law requiring Jews and Christians to wear identifying clothing. Jews were required to wear yellow stars round their neck and on their hats, Christians had to wear Blue. Clothing regulations arose during repressive periods of Arab rule and were more designed to humiliate then persecute non-Muslims. A poll tax was imposed on all non-Muslims by Islamic rulers and failure to pay could result in imprisonment or worse. In 982, Caliph Al-Aziz Billah of the Cairo-based Fatimid dynasty conquered the region. The Fatimids were followers of Isma'ilism, a branch of Shia Islam and claimed descent from Fatima, Mohammed's daughter. Around the year 1010, the Church of Holy Sepulchre (believed to be Jesus burial site), was destroyed by Fatimid Caliph al-Hakim, who relented ten years later and paid for it to be rebuilt. In 1020 al-Hakim claimed divine status and the newly formed Druze religion gave him the status of a messiah. Although the Arab conquest was relatively peaceful and did not cause widespread destruction, it did alter the country's demographics significantly. Over the ensuing several centuries, the region experienced a drastic decline in its population, from an estimated 1 million during Roman and Byzantine times to some 300,000 by the early Ottoman period. This demographic collapse was accompanied by a slow process of Islamization, that resulted from the flight of non-Muslim populations, immigration of Muslims, and local conversion. The majority of the remaining populace belonged to the lowest classes. While the Arab conquerors themselves left the area after the conquest and moved on to other places, the settlement of Arab tribes in the area both before and after the conquest also contributed to the Islamization. As a result, the Muslim population steadily grew and the area became gradually dominated by Muslims on a political and social level. During the early Islamic period, many Christians and Samaritans, belonging to the Byzantine upper class, migrated from the coastal cities to northern Syria and Cyprus, which were still under Byzantine control, while others fled to the central highlands and the Transjordan. As a result, the coastal towns, formerly important economic centers connected with the rest of the Byzantine world, were emptied of most of their residents. Some of these cities—namely Ashkelon, Acre, Arsuf, and Gaza—now fortified border towns, were resettled by Muslim populations, who developed them into significant Muslim centers. The region of Samaria also underwent a process of Islamization as a result of waves of conversion among the Samaritan population and the influx of Muslims into the area. The predominantly Jacobite Monophysitic Christian population had been hostile to Byzantium orthodoxy, and at times for that reason welcomed Muslim rule. There is no strong evidence for forced conversion, or that the jizya tax significantly affected such changes. The demographic situation in Palestine was further altered by urban decline under the Abbasids, and it is thought that the 749 earthquake hastened this process by causing an increase in the number of Jews, Christians, and Samaritans who emigrated to diaspora communities while also leaving behind others who remained in the devastated cities and poor villages until they converted to Islam. Historical records and archeological evidence suggest that many Samaritans converted under Abbasid and Tulunid rule, after suffering through severe difficulties such droughts, earthquakes, religious persecution, heavy taxes and anarchy. The same region also saw the settlement of Arabs. Over the period, the Samaritan population drastically decreased, with the rural Samaritan population converting to Islam, and small urban communities remaining in Nablus and Caesarea, as well as in Cairo, Damascus, Aleppo and Sarepta. Nevertheless, the Muslim population remained a minority in a predominantly Christian area, and it is likely that this status persisted until the Crusader period. Crusades and Mongols In 1095, Pope Urban II called upon Christians to wage a holy war and recapture Jerusalem from Muslim rule. Responding to this call, Christians launched the First Crusade in the same year, a military campaign aimed at retaking the Holy Land, ultimately resulting in the successful siege and conquest of Jerusalem in 1099. In the same year, the Crusaders conquered Beit She'an and Tiberias, and in the following decade, they captured coastal cities with the support of Italian city-state fleets, establishing these coastal ports as crucial strongholds for Crusader rule in the region. Following the First Crusade, several Crusader states were established in the Levant, with the Kingdom of Jerusalem (Regnum Hierosolymitanum) assuming a preeminent position and enjoying special status among them. The population consisted predominantly of Muslims, Christians, Jews, and Samaritans, while the Crusaders remained a minority and relied on the local population who worked the soil. The region saw the construction of numerous robust castles and fortresses, yet efforts to establish permanent European villages proved unsuccessful. Around 1180, Raynald of Châtillon, ruler of Transjordan, caused increasing conflict with the Ayyubid Sultan Saladin (Salah-al-Din), leading to the defeat of the Crusaders in the 1187 Battle of Hattin (above Tiberias). Saladin was able to peacefully take Jerusalem and conquered most of the former Kingdom of Jerusalem. Saladin's court physician was Maimonides, a refugee from Almohad (Muslim) persecution in Córdoba, Spain, where all non-Muslim religions had been banned. The Christian world's response to the loss of Jerusalem came in the Third Crusade of 1190. After lengthy battles and negotiations, Richard the Lionheart and Saladin concluded the Treaty of Jaffa in 1192 whereby Christians were granted free passage to make pilgrimages to the holy sites, while Jerusalem remained under Muslim rule. In 1229, Jerusalem peacefully reverted into Christian control as part of a treaty between Holy Roman Emperor Frederick II and Ayyubid sultan al-Kamil that ended the Sixth Crusade. In 1244, Jerusalem was sacked by the Khwarezmian Tatars who decimated the city's Christian population, drove out the Jews and razed the city. The Khwarezmians were driven out by the Ayyubids in 1247. Mamluk period Between 1258 and 1291, the area was the frontier between Mongol invaders (occasional Crusader allies) and the Mamluks of Egypt. The conflict impoverished the country and severely reduced the population. In Egypt a caste of warrior slaves, known as the Mamluks, gradually took control of the kingdom. The Mamluks were mostly of Turkish origin, and were bought as children and then trained in warfare. They were highly prized warriors, who gave rulers independence of the native aristocracy. In Egypt they took control of the kingdom following a failed invasion by the Crusaders (Seventh Crusade). The first Mamluk Sultan, Qutuz of Egypt, defeated the Mongols in the Battle of Ain Jalut ("Goliath's spring" near Ein Harod), ending the Mongol advances. He was assassinated by one of his Generals, Baibars, who went on to eliminate most of the Crusader outposts. The Mamluks ruled Palestine until 1516, regarding it as part of Syria. In Hebron, Jews were banned from worshipping at the Cave of the Patriarchs (the second-holiest site in Judaism); they were only allowed to enter 7 steps inside the site and the ban remained in place until Israel assumed control of the West Bank in the Six-Day War.[undue weight? – discuss] The Egyptian Mamluk sultan Al-Ashraf Khalil conquered the last outpost of Crusader rule in 1291. The Mamluks, continuing the policy of the Ayyubids, made the strategic decision to destroy the coastal area and to bring desolation to many of its cities, from Tyre in the north to Gaza in the south. Ports were destroyed and various materials were dumped to make them inoperable. The goal was to prevent attacks from the sea, given the fear of the return of the Crusaders. This had a long-term effect on those areas, which remained sparsely populated for centuries. The activity in that time concentrated more inland. With the 1492 expulsion of Jews from Spain and 1497 persecution of Jews and Muslims by Manuel I of Portugal, many Jews moved eastward, with some deciding to settle in the Mamluk Palestine. As a consequence, the local Jewish community underwent significant rejuvenation. The influx of Sephardic Jews began under Mamluk rule in the 15th century, and continued throughout the 16th century and especially after the Ottoman conquest. As city-dwellers, the majority of Sephardic Jews preferred to settle in urban areas, mainly in Safed but also in Jerusalem, while the Musta'arbi community comprised the majority of the villagers' Jews. Ottoman period Under the Mamluks, the area was a province of Bilad a-Sham (Syria). It was conquered by Turkish Sultan Selim I in 1516–17, becoming a part of the province of Ottoman Syria for the next four centuries, first as the Damascus Eyalet and later as the Syria Vilayet (following the Tanzimat reorganization of 1864). With the more favorable conditions that followed the Ottoman conquest, the immigration of Jews fleeing Catholic Europe, which had already begun under Mamluk rule, continued, and soon an influx of exiled Sephardic Jews came to dominate the Jewish community in the area. In 1558, Selim II (1566–1574), successor to Suleiman, whose wife Nurbanu Sultan was Jewish, gave control of Tiberias to Doña Gracia Mendes Nasi, one of the richest women in Europe and an escapee from the Inquisition. She encouraged Jewish refugees to settle in the area and established a Hebrew printing press. Safed became a centre for study of the Kabbalah and other Jewish religious studies, culminating with Joseph Karo's writing of the Shulchan Aruch – published in 1565 in Venice – which became the near-universal standard of Jewish religious law. Doña Nasi's nephew, Joseph Nasi, was made governor of Tiberias and he encouraged Jewish settlement from Italy. In 1660, a Druze power struggle led to the destruction of Safed and Tiberias. In the late 18th century a local Arab sheikh, Zahir al-Umar, created a de facto independent Emirate in the Galilee. Ottoman attempts to subdue the Sheikh failed, but after Zahir's death the Ottomans restored their rule in the area. In 1799, Napoleon briefly occupied the country and planned a proclamation inviting Jews to create a state. The proclamation was shelved following his defeat at Acre. In 1831, Muhammad Ali of Egypt, an Ottoman ruler who left the Empire and tried to modernize Egypt, conquered Ottoman Syria and imposed conscription, leading to the Arab revolt. In 1838, there was another Druze revolt. In 1839 Moses Montefiore met with Muhammed Pasha in Egypt and signed an agreement to establish 100–200 Jewish villages in the Damascus Eyalet of Ottoman Syria, but in 1840 the Egyptians withdrew before the deal was implemented, returning the area to Ottoman governorship. In 1844, Jews constituted the largest population group in Jerusalem. By 1896 Jews constituted an absolute majority in Jerusalem, but the overall population in Palestine was 88% Muslim and 9% Christian. Between 1882 and 1903, approximately 35,000 Jews moved to Palestine, known as the First Aliyah. In the Russian Empire, Jews faced growing persecution and legal restrictions. Half the world's Jews lived in the Russian Empire, where they were restricted to living in the Pale of Settlement. Severe pogroms in the early 1880s and legal repression led to 2 million Jews emigrating from the Russian Empire. 1.5 million went to the United States. Popular destinations were also Germany, France, the United Kingdom, the Netherlands, Argentina and Palestine. The Zionist movement began in earnest in 1882 with Leon Pinsker's pamphlet Auto-Emancipation, which argued for the creation of a Jewish national homeland as a means to avoid the violence plaguing Jewish communities in Eastern Europe. At the 1884 Katowice Conference, Russian Jews established the Bilu and Hovevei Zion ("Lovers of Zion") movements with the aim of settling in Palestine. In 1878, Russian Jewish emigrants established the village of Petah Tikva ("The Beginning of Hope"), followed by Rishon LeZion ("First to Zion") in 1882. The existing Ashkenazi communities were concentrated in the Four Holy Cities, extremely poor and relied on donations (halukka) from groups abroad, while the new settlements were small farming communities, but still relied on funding by the French Baron, Edmond James de Rothschild, who sought to establish profitable enterprises. Many early migrants could not find work and left, but despite the problems, more settlements arose and the community grew. After the Ottoman conquest of Yemen in 1881, a large number of Yemenite Jews also emigrated to Palestine, often driven by Messianism. In 1896 Theodor Herzl published Der Judenstaat (The Jewish State), in which he asserted that the solution to growing antisemitism in Europe (the so-called "Jewish Question") was to establish a Jewish state. In 1897, the World Zionist Organization was founded and the First Zionist Congress proclaimed its aim "to establish a home for the Jewish people in Palestine secured under public law." The Congress chose Hatikvah ("The Hope") as its anthem. Between 1904 and 1914, around 40,000 Jews settled in the area now known as Israel (the Second Aliyah). In 1908, the World Zionist Organization set up the Palestine Bureau (also known as the "Eretz Israel Office") in Jaffa and began to adopt a systematic Jewish settlement policy. In 1909, residents of Jaffa bought land outside the city walls and built the first entirely Hebrew-speaking town, Ahuzat Bayit (later renamed Tel Aviv). In 1915–1916, Talaat Pasha of the Young Turks forced around a million Armenian Christians from their homes in Eastern Turkey, marching them south through Syria, in what is now known as the Armenian genocide. The number of dead is thought to be around 700,000. Hundreds of thousands were forcibly converted to Islam. A community of survivors settled in Jerusalem, one of whom developed the now iconic Armenian pottery. During World War I, most Jews supported the Germans because they were fighting the Russians who were regarded as the Jews' main enemy. In Britain, the government sought Jewish support for the war effort for a variety of reasons including an antisemitic perception of "Jewish power" in the Ottoman Empire's Young Turks movement which was based in Thessaloniki, the most Jewish city in Europe (40% of the 160,000 population were Jewish). The British also hoped to secure American Jewish support for US intervention on Britain's behalf. There was already sympathy for the aims of Zionism in the British government, including the Prime Minister Lloyd George. Over 14,000 Jews were expelled by the Ottoman military commander from the Jaffa area in 1914–1915, due to suspicions they were subjects of Russia, an enemy, or Zionists wishing to detach Palestine from the Ottoman Empire, and when the entire population, including Muslims, of both Jaffa and Tel Aviv was subject to an expulsion order in April 1917, the affected Jews could not return until the British conquest ended in 1918, which drove the Turks out of Southern Syria. A year prior, in 1917, the British foreign minister, Arthur Balfour, sent a public letter to the British Lord Rothschild, a leading member of his party and leader of the Jewish community. The letter subsequently became known as the Balfour Declaration. It stated that the British Government "view[ed] with favour the establishment in Palestine of a national home for the Jewish people". The declaration provided the British government with a pretext for claiming and governing the country. New Middle Eastern boundaries were decided by an agreement between British and French bureaucrats. A Jewish Legion composed largely of Zionist volunteers organized by Ze'ev Jabotinsky and Joseph Trumpeldor participated in the British invasion. It also participated in the failed Gallipoli Campaign. The Nili Zionist spy network provided the British with details of Ottoman plans and troop concentrations. The Ottoman Empire chose to ally itself with Germany when the first war began. Arab leaders dreamed of freeing themselves from Ottoman rule and establishing self-government or forming an independent Arab state. Therefore, Britain contacted Hussein bin Ali of the Kingdom of Hejaz and proposed cooperation. Together they organized the Arab revolt that Britain supplied with very large quantities of rifles and ammunition. In cooperation between British artillery and Arab infantry, the city of Aqaba on the Red Sea was conquered. The Arab army then continued north while Britain attacked the ottomans from the sea. In 1917–1918, Jerusalem and Damascus were conquered from the ottomans. Britain then broke off cooperation with the Arab army. It turned out that Britain had already entered into the secret Sykes–Picot Agreement that meant that only Britain and France would be allowed to administer the land conquered from the Ottoman Empire. After pushing out the Ottomans, Palestine came under martial law. The British, French and Arab Occupied Enemy Territory Administration governed the area shortly before the armistice with the Ottomans until the promulgation of the mandate in 1920. Mandatory Palestine The British Mandate (in effect, British rule) of Palestine, including the Balfour Declaration, was confirmed by the League of Nations in 1922 and came into effect in 1923. The territory of Transjordan was also covered by the Mandate but under separate rules that excluded it from the Balfour Declaration. Britain signed a treaty with the United States (which did not join the League of Nations) in which the United States endorsed the terms of the Mandate, which was approved unanimously by both the U.S. Senate and House of Representatives. The Balfour declaration was published on the 2nd of November 1917 and the Bolsheviks seized control of Russia a week later. This led to civil war in the Russian Empire. Between 1918 and 1921, a series of pogroms led to the death of at least 100,000 Jews (mainly in what is now Ukraine), and the displacement as refugees of a further 600,000. This led to further migration to Palestine. Between 1919 and 1923, some 40,000 Jews arrived in Palestine in what is known as the Third Aliyah. Many of the Jewish immigrants of this period were Socialist Zionists and supported the Bolsheviks. The migrants became known as pioneers (halutzim), experienced or trained in agriculture who established self-sustaining communes called kibbutzim. Malarial marshes in the Jezreel Valley and Hefer Plain were drained and converted to agricultural use. Land was bought by the Jewish National Fund, a Zionist charity that collected money abroad for that purpose. After the French victory over the Arab Kingdom of Syria ended hopes of Arab independence, there were clashes between Arabs and Jews in Jerusalem during the 1920 Nebi Musa riots and in Jaffa the following year, leading to the establishment of the Haganah underground Jewish militia. A Jewish Agency was created which issued the entry permits granted by the British and distributed funds donated by Jews abroad. Between 1924 and 1929, over 80,000 Jews arrived in the Fourth Aliyah, fleeing antisemitism and heavy tax burdens imposed on trade in Poland and Hungary, inspired by Zionism and motivated by the closure of United States borders by the Immigration Act of 1924 which severely limited immigration from Eastern and Southern Europe. Pinhas Rutenberg, a former Commissar of St Petersburg in Russia's pre-Bolshevik Kerensky Government, built the first electricity generators in Palestine. In 1925, the Jewish Agency established the Hebrew University in Jerusalem and the Technion (technological university) in Haifa. British authorities introduced the Palestine pound (worth 1000 "mils") in 1927, replacing the Egyptian pound as the unit of currency in the Mandate. From 1928, the democratically elected Va'ad Leumi (Jewish National Council or JNC) became the main administrative institution of the Palestine Jewish community (Yishuv) and included non-Zionist Jews. As the Yishuv grew, the JNC adopted more government-type functions, such as education, health care, and security. With British permission, the Va'ad Leumi raised its own taxes and ran independent services for the Jewish population. In 1929, tensions grew over the Kotel (Wailing Wall), the holiest spot in the world for modern Judaism,[citation needed] which was then a narrow alleyway where the British banned Jews from using chairs or curtains: Many of the worshippers were elderly and needed seats; they also wanted to separate women from men. The Mufti of Jerusalem said it was Muslim property and deliberately had cattle driven through the alley.[citation needed] He alleged that the Jews were seeking control of the Temple Mount. This provided the spark for the August 1929 Palestine riots. The main victims were the (non-Zionist) ancient Jewish community at Hebron, who were massacred. The riots led to right-wing Zionists establishing their own militia in 1931, the Irgun Tzvai Leumi (National Military Organization, known in Hebrew by its acronym "Etzel"), which was committed to a more aggressive policy towards the Arab population. During the interwar period, the perception grew that there was an irreconciliable tension between the two Mandatory functions, of providing for a Jewish homeland in Palestine, and the goal of preparing the country for self-determination. The British rejected the principle of majority rule or any other measure that would give the Arab population, who formed the majority of the population, control over Palestinian territory. Between 1929 and 1938, 250,000 Jews arrived in Palestine (Fifth Aliyah). In 1933, the Jewish Agency and the Nazis negotiated the Ha'avara Agreement (transfer agreement), under which 50,000 German Jews would be transferred to Palestine. The Jews' possessions were confiscated and in return the Nazis allowed the Ha'avara organization to purchase 14 million pounds worth of German goods for export to Palestine and use it to compensate the immigrants. Although many Jews wanted to leave Nazi Germany, the Nazis prevented Jews from taking any money and restricted them to two suitcases so few could pay the British entry tax.[citation needed] The agreement was controversial and the Labour Zionist leader who negotiated the agreement, Haim Arlosoroff, was assassinated in Tel Aviv in 1933. The assassination was used by the British to create tension between the Zionist left and the Zionist right.[citation needed] Arlosoroff had been the boyfriend of Magda Ritschel some years before she married Joseph Goebbels. There has been speculation that he was assassinated by the Nazis to hide the connection but there is no evidence for it. Between 1933 and 1936, 174,000 arrived despite the large sums the British demanded for immigration permits: Jews had to prove they had 1,000 pounds for families with capital (equivalent to £85,824 in 2023), 500 pounds if they had a profession and 250 pounds if they were skilled labourers.[better source needed] Jewish immigration and Nazi propaganda contributed to the large-scale 1936–1939 Arab revolt in Palestine, a largely nationalist uprising directed at ending British rule. The head of the Jewish Agency, Ben-Gurion, responded to the Arab Revolt with a policy of "Havlagah"—self-restraint and a refusal to be provoked by Arab attacks in order to prevent polarization. The Etzel group broke off from the Haganah in opposition to this policy. The British responded to the revolt with the Peel Commission (1936–37), a public inquiry that recommended that an exclusively Jewish territory be created in the Galilee and western coast (including the population transfer of 225,000 Arabs); the rest becoming an exclusively Arab area. The two main Jewish leaders, Chaim Weizmann and David Ben-Gurion, had convinced the Zionist Congress to approve equivocally the Peel recommendations as a basis for more negotiation. The plan was rejected outright by the Palestinian Arab leadership and they renewed the revolt, which caused the British to abandon the plan as unworkable. Testifying before the Peel Commission, Weizmann said "There are in Europe 6,000,000 people ... for whom the world is divided into places where they cannot live and places where they cannot enter." In 1938, the US called an international conference to address the question of the vast numbers of Jews trying to escape Europe. Britain made its attendance contingent on Palestine being kept out of the discussion. No Jewish representatives were invited. The Nazis proposed their own solution: that the Jews of Europe be shipped to Madagascar (the Madagascar Plan). The agreement proved fruitless, and the Jews were stuck in Europe. With millions of Jews trying to leave Europe and every country closed to Jewish migration, the British decided to close Palestine. The White Paper of 1939, recommended that an independent Palestine, governed jointly by Arabs and Jews, be established within 10 years. The White Paper agreed to allow 75,000 Jewish immigrants into Palestine over the period 1940–44, after which migration would require Arab approval. Both the Arab and Jewish leadership rejected the White Paper. In March 1940 the British High Commissioner for Palestine issued an edict banning Jews from purchasing land in 95% of Palestine. Jews now resorted to illegal immigration: (Aliyah Bet or "Ha'apalah"), often organized by the Mossad Le'aliyah Bet and the Irgun. With no outside help and no countries ready to admit them, very few Jews managed to escape Europe between 1939 and 1945. Those caught by the British were mostly imprisoned in Mauritius. During the Second World War, the Jewish Agency worked to establish a Jewish army that would fight alongside the British forces. Churchill supported the plan but British military and government opposition led to its rejection. The British demanded that the number of Jewish recruits match the number of Arab recruits. In June 1940, Italy declared war on the British Commonwealth and sided with Germany. Within a month, Italian planes bombed Tel Aviv and Haifa, inflicting multiple casualties. In May 1941, the Palmach was established to defend the Yishuv against the planned Axis invasion through North Africa. The British refusal to provide arms to the Jews, even when Rommel's forces were advancing through Egypt in June 1942 (intent on occupying Palestine), and the 1939 White Paper led to the emergence of a Zionist leadership in Palestine that believed conflict with Britain was inevitable. Despite this, the Jewish Agency called on Palestine's Jewish youth to volunteer for the British Army. 30,000 Palestinian Jews and 12,000 Palestinian Arabs enlisted in the British armed forces during the war. In June 1944 the British agreed to create a Jewish Brigade that would fight in Italy. Approximately 1.5 million Jews around the world served in every branch of the allied armies, mainly in the Soviet and US armies. 200,000 Jews died serving in the Soviet army alone. A small group (about 200 activists), dedicated to resisting the British administration in Palestine, broke away from the Etzel (which advocated support for Britain during the war) and formed the "Lehi" (Stern Gang), led by Avraham Stern. In 1942, the USSR released the Revisionist Zionist leader Menachem Begin from the Gulag and he went to Palestine, taking command of the Etzel organization with a policy of increased conflict against the British. At about the same time Yitzhak Shamir escaped from the camp in Eritrea where the British were holding Lehi activists without trial, taking command of the Lehi (Stern Gang). Jews in the Middle East were also affected by the war. Most of North Africa came under Nazi control and many Jews were used as slaves. The 1941 pro-Axis coup in Iraq was accompanied by massacres of Jews. The Jewish Agency put together plans for a last stand in the event of Rommel invading Palestine (the Nazis planned to exterminate Palestine's Jews). Between 1939 and 1945, the Nazis, aided by local forces, led systematic efforts to kill every person of Jewish extraction in Europe (The Holocaust), causing the deaths of approximately 6 million Jews. A quarter of those killed were children. The Polish and German Jewish communities, which played an important role in defining the pre-1945 Jewish world, mostly ceased to exist. In the United States and Palestine, Jews of European origin became disconnected from their families and roots. As the Holocaust mainly affected Ashkenazi Jews, Sepharadi and Mizrahi Jews, who had been a minority, became a much more significant factor in the Jewish world. Those Jews who survived in central Europe, were displaced persons (refugees); an Anglo-American Committee of Inquiry, established to examine the Palestine issue, surveyed their ambitions and found that over 95% wanted to migrate to Palestine. In the Zionist movement the moderate Pro-British (and British citizen) Weizmann, whose son died flying in the RAF, was undermined by Britain's anti-Zionist policies. Leadership of the movement passed to the Jewish Agency in Palestine, now led by the anti-British Socialist-Zionist party (Mapai) led by David Ben-Gurion. The British Empire was severely weakened by the war. In the Middle East, the war had made Britain conscious of its dependence on Arab oil. Shortly after VE Day, the Labour Party won the general election in Britain. Although Labour Party conferences had for years called for the establishment of a Jewish state in Palestine, the Labour government now decided to maintain the 1939 White Paper policies. Illegal migration (Aliyah Bet) became the main form of Jewish entry into Palestine. Across Europe Bricha ("flight"), an organization of former partisans and ghetto fighters, smuggled Holocaust survivors from Eastern Europe to Mediterranean ports, where small boats tried to breach the British blockade of Palestine. Meanwhile, Jews from Arab countries began moving into Palestine overland. Despite British efforts to curb immigration, during the 14 years of the Aliyah Bet, over 110,000 Jews entered Palestine. By the end of World War II, the Jewish population of Palestine had increased to 33% of the total population. In an effort to win independence, Zionists now waged a guerrilla war against the British. The main underground Jewish militia, the Haganah, formed an alliance called the Jewish Resistance Movement with the Etzel and Stern Gang to fight the British. In June 1946, following instances of Jewish sabotage, such as in the Night of the Bridges, the British launched Operation Agatha, arresting 2,700 Jews, including the leadership of the Jewish Agency, whose headquarters were raided. Those arrested were held without trial. On 4 July 1946 a massive pogrom in Poland led to a wave of Holocaust survivors fleeing Europe for Palestine. Three weeks later, Irgun bombed the British Military Headquarters of the King David Hotel in Jerusalem, killing 91 people. In the days following the bombing, Tel Aviv was placed under curfew and over 120,000 Jews, nearly 20% of the Jewish population of Palestine, were questioned by the police. In the US, Congress criticized British handling of the situation and considered delaying loans that were vital to British post-war recovery. The alliance between Haganah and Etzel was dissolved after the King David bombings. Between 1945 and 1948, 100,000–120,000 Jews left Poland. Their departure was largely organized by Zionist activists under the umbrella of the semi-clandestine organization Berihah ("Flight"). Berihah was also responsible for the organized emigration of Jews from Romania, Hungary, Czechoslovakia and Yugoslavia, totalling 250,000 (including Poland) Holocaust survivors. The British imprisoned the Jews trying to enter Palestine in the Atlit detainee camp and Cyprus internment camps. Those held were mainly Holocaust survivors, including large numbers of children and orphans. In response to Cypriot fears that the Jews would never leave and because the 75,000 quota established by the 1939 White Paper had never been filled, the British allowed the refugees to enter Palestine at a rate of 750 per month. On 2 April 1947, the United Kingdom requested that the question of Palestine be handled by the General Assembly. The General Assembly created a committee, United Nations Special Committee on Palestine (UNSCOP), to report on "the question of Palestine". In July 1947 the UNSCOP visited Palestine and met with Jewish and Zionist delegations. The Arab Higher Committee boycotted the meetings. During the visit the British Foreign Secretary Ernest Bevin ordered that passengers from an Aliyah Bet ship, SS Exodus 1947, be sent back to Europe. The Holocaust surviving migrants on the ship were forcibly removed by British troops at Hamburg, Germany. The principal non-Zionist Orthodox Jewish (or Haredi) party, Agudat Israel, recommended to UNSCOP that a Jewish state be set up after reaching a religious status quo agreement with Ben-Gurion. The agreement granted an exemption from military service to a quota of yeshiva (religious seminary) students and to all Orthodox women, made the Sabbath the national weekend, guaranteed kosher food in government institutions and allowed Orthodox Jews to maintain a separate education system. The majority report of UNSCOP proposed "an independent Arab State, an independent Jewish State, and the City of Jerusalem", the last to be under "an International Trusteeship System". On 29 November 1947, in Resolution 181 (II), the General Assembly adopted the majority report of UNSCOP, but with slight modifications. The Plan also called for the British to allow "substantial" Jewish migration by 1 February 1948. Neither Britain nor the UN Security Council took any action to implement the recommendation made by the resolution and Britain continued detaining Jews attempting to enter Palestine. Concerned that partition would severely damage Anglo-Arab relations, Britain denied UN representatives access to Palestine during the period between the adoption of Resolution 181 (II) and the termination of the British Mandate. The British withdrawal was completed in May 1948. However, Britain continued to hold Jewish immigrants of "fighting age" and their families on Cyprus until March 1949. The General Assembly's vote caused joy in the Jewish community and anger in the Arab community. Violence broke out between the sides, escalating into civil war. From January 1948, operations became increasingly militarized, with the intervention of a number of Arab Liberation Army regiments inside Palestine, each active in a variety of distinct sectors around the different coastal towns. They consolidated their presence in Galilee and Samaria. Abd al-Qadir al-Husayni came from Egypt with several hundred men of the Army of the Holy War. Having recruited a few thousand volunteers, he organized the blockade of the 100,000 Jewish residents of Jerusalem. The Yishuv tried to supply the city using convoys of up to 100 armoured vehicles, but largely failed. By March, almost all Haganah's armoured vehicles had been destroyed, the blockade was in full operation, and hundreds of Haganah members who had tried to bring supplies into the city were killed. Up to 100,000 Arabs, from the urban upper and middle classes in Haifa, Jaffa and Jerusalem, or Jewish-dominated areas, evacuated abroad or to Arab centres eastwards. This situation caused the US to withdraw their support for the Partition plan, thus encouraging the Arab League to believe that the Palestinian Arabs, reinforced by the Arab Liberation Army, could put an end to the plan for partition. The British, on the other hand, decided on 7 February 1948 to support the annexation of the Arab part of Palestine by Transjordan. The Jordanian army was commanded by the British. David Ben-Gurion reorganized the Haganah and made conscription obligatory. Every Jewish man and woman in the country had to receive military training. Thanks to funds raised by Golda Meir from sympathisers in the United States, and Stalin's decision to support the Zionist cause, the Jewish representatives of Palestine were able to purchase important arms in Eastern Europe. Ben-Gurion gave Yigael Yadin the responsibility to plan for the announced intervention of the Arab states. The result of his analysis was Plan Dalet, in which Haganah passed from the defensive to the offensive. The plan sought to establish Jewish territorial continuity by conquering mixed zones. Tiberias, Haifa, Safed, Beisan, Jaffa and Acre fell, resulting in the flight of more than 250,000 Palestinian Arabs. On 14 May 1948, on the day the last British forces left Haifa, the Jewish People's Council gathered at the Tel Aviv Museum and proclaimed the establishment of a Jewish state, to be known as the State of Israel. State of Israel In 1948, following the 1947–1948 war in Mandatory Palestine, the Israeli Declaration of Independence sparked the 1948 Arab–Israeli War. This resulted in the 1948 Palestinian expulsion and flight from the land that the State of Israel came to control, and led to waves of Jewish immigration from other parts of the Middle East. The latter half of the 20th century saw further conflicts between Israel and its neighbouring Arab nations. In 1967, the Six-Day War erupted; in its aftermath, Israel captured and occupied the Golan Heights from Syria, the West Bank from Jordan, and the Gaza Strip and the Sinai Peninsula from Egypt. In 1973, the Yom Kippur War began with an attack by Egypt on the Israeli-occupied Sinai Peninsula. In 1979, the Egypt–Israel peace treaty was signed, based on the Camp David Accords. In 1993, Israel signed the Oslo I Accord with the Palestine Liberation Organization, which was followed by the establishment of the Palestinian National Authority. In 1994, the Israel–Jordan peace treaty was signed. Despite efforts to finalize the peace agreement, the conflict continues. Demographics See also Notes References Further reading External links Israeli settlementsTimeline, International law West BankJudea and Samaria Area Gaza StripHof Aza Regional Council |
======================================== |
[SOURCE: https://www.mako.co.il/spirituality-popular_culture/Article-494842ff06e9431006.htm] | [TOKENS: 36665] |
כניסת שבת, זמני יציאת שבת ומועדי הדלקת נרות - 20.02.2026זמני כניסת שבת פרשת תרומה - יציאת שבת, מועדי הדלקת נרות, זמני הדלקת נרות וצאת שבת בערים השונות בארץ ובעולם ורשימת בתי כנסת בכל עיר ועיר. שבת שלוםmakomakoפורסם: 14.02.26, 21:30קבלת שבת | AI: makoהקישור הועתקכניסה ויציאת שבת בערים בארץ - שבת פרשת תרומה, ד׳ באדר תשפ״ו 20.02.2026 ירושלים כניסת שבת: 16:49 יציאת שבת: 18:07נתניה כניסת שבת: 17:12 יציאת שבת: 18:08תל אביב כניסת שבת: 17:13 יציאת שבת: 18:09חדרה כניסת שבת: 17:12 יציאת שבת: 18:08חיפה כניסת שבת: 16:59 יציאת שבת: 18:07טבריה כניסת שבת: 17:09 יציאת שבת: 18:05באר שבע כניסת שבת: 17:14 יציאת שבת: 18:09אשקלון כניסת שבת: 17:14 יציאת שבת: 18:10רחובות כניסת שבת: 17:13 יציאת שבת: 18:09אילת כניסת שבת: 17:15 יציאת שבת: 18:10אשדוד כניסת שבת: 17:14 יציאת שבת: 18:09מודיעין כניסת שבת: 17:12 יציאת שבת: 18:08עפולה כניסת שבת: 17:10 יציאת שבת: 18:06פתח תקווה כניסת שבת: 17:12 יציאת שבת: 18:08נהריה כניסת שבת: 17:11 יציאת שבת: 18:07קרית גת כניסת שבת: 17:13 יציאת שבת: 18:09בית שמש כניסת שבת: 17:12 יציאת שבת: 18:08צפת כניסת שבת: 17:09 יציאת שבת: 18:05כפר סבא כניסת שבת: 17:12 יציאת שבת: 18:08אופקים כניסת שבת: 17:14 יציאת שבת: 18:10חולון כניסת שבת: 17:13 יציאת שבת: 18:09ראשון לציון כניסת שבת: 17:13 יציאת שבת: 18:09דימונה כניסת שבת: 17:13 יציאת שבת: 18:08עכו כניסת שבת: 17:11 יציאת שבת: 18:07רמלה כניסת שבת: 17:13 יציאת שבת: 18:09בית שאן כניסת שבת: 17:09 יציאת שבת: 18:06רעננה כניסת שבת: 17:12 יציאת שבת: 18:08ערד כניסת שבת: 17:12 יציאת שבת: 18:08בני ברק כניסת שבת: 17:09 יציאת שבת: 18:09לוד כניסת שבת: 17:00 יציאת שבת: 18:08כרמיאל כניסת שבת: 16:58 יציאת שבת: 18:06מודיעין עילית כניסת שבת: 17:00 יציאת שבת: 18:08נתיבות כניסת שבת: 17:02 יציאת שבת: 18:10ראש העין כניסת שבת: 17:00 יציאת שבת: 18:08מעלה אדומים כניסת שבת: 16:59 יציאת שבת: 18:07קריית שמונה כניסת שבת: 16:56 יציאת שבת: 18:05שדרות כניסת שבת: 17:02 יציאת שבת: 18:10קצרין כניסת שבת: 16:59 יציאת שבת: 18:05גבעת שמואל כניסת שבת: 17:00 יציאת שבת: 18:09חריש כניסת שבת: 17:01 יציאת שבת: 18:08רמת גן כניסת שבת: 17:09 יציאת שבת: 18:09גן יבנה כניסת שבת: 17:01 יציאת שבת: 18:10יבנה כניסת שבת: 17:01 יציאת שבת: 18:09אריאל כניסת שבת: 17:03 יציאת שבת: 18:08בת ים כניסת שבת: 17:01 יציאת שבת: 18:09הרצליה כניסת שבת: 17:00 יציאת שבת: 18:09זמני כניסת ויציאת השבת בערים ברחבי העולםניו יורק כניסת שבת: 17:18 יציאת שבת: 18:19לונדון כניסת שבת: 17:06 יציאת שבת: 18:17פריז כניסת שבת: 18:01 יציאת שבת: 19:09אמסטרדם כניסת שבת: 17:44 יציאת שבת: 18:56בודפשט כניסת שבת: 16:56 יציאת שבת: 18:03ברצלונה כניסת שבת: 18:13 יציאת שבת: 19:14סלוניקי כניסת שבת: 17:50 יציאת שבת: 18:51רומא כניסת שבת: 17:31 יציאת שבת: 18:32קייב כניסת שבת: 17:05 יציאת שבת: 18:15פראג כניסת שבת: 17:10 יציאת שבת: 18:19דובאי כניסת שבת: 17:57 יציאת שבת: 18:51אומן כניסת שבת: 17:10 יציאת שבת: 18:18ציריך כניסת שבת: 17:39 יציאת שבת: 18:45מיאמי כניסת שבת: 17:59 יציאת שבת: 18:53בוסטון כניסת שבת: 17:05 יציאת שבת: 18:07לאס וגאס כניסת שבת: 17:08 יציאת שבת: 18:07ברוקלין כניסת שבת: 17:18 יציאת שבת: 18:19בנגקוק כניסת שבת: 18:06 יציאת שבת: 18:57פרשת השבוע: תרומה/סיון רהב מאיר פרשת השבוע היא פרשת תרומה, והיא הפרשה השביעית בספר שמות. הפרשה עוסקת כולה בבניית המשכן, שהוא המרכז הרוחני שליווה את העם במסע של 40 שנה במדבר. התורה מצווה אותנו לבנות בכל מקום מרכז רוחני, כמו בית כנסת, והעם לא חיכה עד שהגיע לארץ ישראל ובנה את בית המקדש. תמיד צריך מקום קדוש שהולך איתנו. אחרי יציאת מצרים, קריעת ים סוף וקבלת התורה בהר סיני – יש בפרשה הזו שינוי כיוון: עכשיו אלוקים דורש מאיתנו להתחיל לפעול ולעשות. לא רק לקבל מתנות ושפע של חסדים ממנו, אלא לבצע דברים בעצמנו. לתרום למשכן ולבנות אותו. בריאת העולם מתוארת בתורה ב-30 פסוקים בערך, ובניית המשכן מתוארת בכ-400 פסוקים. פרשנינו מסבירים שהתורה אינה ספר היסטוריה או מדע, היא לא עוסקת בעולם אלא במה האדם צריך לעשות בעולם הזה. זה העיקר. בפרשה פסוק מפורסם: "ועשו לי מקדש - ושכנתי בתוכם". אלוקים מבקש שנקים מקום קדוש, שנפעל ונעשה, אבל מזכיר שהוא שוכן גם בתוך ליבנו, בתוכנו. השבוע - ראש חודש אדר (בימים שישי ושבת) ובעוד כשבועיים חג הפורים. משנכנס אדר מרבים בשמחה, והוא כבר נכנס. תחזית מזג האוויר - שישי ושבת 20-21/02/2026שישי בהיר. תחול עלייה בטמפרטורות וירידה באחוזי הלחות, ויהיה חם מהרגיל לעונה. ישרור אובך. בשעות אחר הצהריים ינשבו רוחות צפוניות ערות לאורך מישור החוף.שבת מעונן חלקית עד בהיר עם ירידה בטמפרטורות. למרות זאת, עדיין יהיה חם מהרגיל לעונה, בעיקר בפנים הארץ ובהרים.פרסומתשאלות ותשובות בנושא השבתהאם מותר לאכול אחרי כניסת שבת?נוהגים לקדש בעת כניסת השבת, לפני תחילת הארוחה. בוצעים את החלה ואז מתחילים את השבת.איפה מומלץ להניח את נרות השבת?יש כאלו שמקפידים לשים את הנרות על שולחן השבת. אם יש לכם ילדים קטנים עדיף לשים את הנרות במקום גבוה.איך נקבע זמן כניסת שבת?בירושלים נוהגים להדליק נרות 40 דקות לפני השקיעה. בחיפה נוהגים להדליק נרות 30 דקות לפני השקיעה וברוב המקומות – 20 דקות לפני השקיעה.האם מותר לשחק במשחקי קופסה בשבת?כן. למי שלא מחמיר מותר.האם מותר להתקלח בשבת?בעיקרון לא למי שמחמיר. מותר לשטוף רק את הפנים, הידיים והרגליים במים שחוממו מערב שבת.האם מותר לתת מתנה בשבת?מותר רק אם יש למתנה שימוש בשבת.האם מותר לרכוב על אופניים בשבת?בעיקרון לא. עם זאת, לילדים קטנים מותר.האם מותר לאכול לאחר כניסת השבת?מרגע שנכנסה השבת אזי יש להימנע ממזון ומשתייה עד לאחר הקידוש.מדוע זמני כניסת השבת משתנים מעיר לעיר בארץ?הסיבה לכך נעוצה במנהגים שונים - בעוד שלפי נוהג ירושלים מדליקים את נרות השבת כ-40 דקות לפני השקיעה, לפי נוהג חיפה מדליקים את נרות השבת כ-30 דקות לפני השקיעה. לעומת זאת בערים רבות מדליקים את הנרות רק כ-20 דקות לפני השקיעה. כך, ניתן למצוא הבדלים בשעת כניסת השבת בין ערים שונות.האם מותר לקבל את השבת לפני הזמן?זוהי מצווה להוסיף מהחול על הקודש ולקבל את השבת לפני השקיעה.עד מתי מותר להדליק נרות שבת?היות והדעות חלוקות לגבי העיתוי המדויק של כניסת השבת - שעת השקיעה לעומת שעת צאת הכוכבים, יש לקבל את השבת כמה דקות לפני השקיעה. ברוב הערים נהוג להדליק את הנרות לפחות 20 דקות לפני השקיעה (בירושלים 40 דקות ובחיפה 30 דקות לפני השקיעה).AI: makoפרסומתסדר יום השבתביום שישי לאחר כניסת השבת הדלקת נרות שבת קבלת שבת קידוש וסעודת ליל השבת עונג שבת ביום שבת עצמו: תפילת שחרית של יום שבת קידוש סעודת יום השבת תפילת מנחה של שבת סעודה שלישית הבדלה סעודה רביעית מצוות השבתכחלק מייחוד יום השבת מיתר ימי השבוע ישנם שלושה אופני התקדשות המבדלים את השבת מחול – מעשה, דיבור ומחשבה. זאת במטרה לשחרר אותנו מכל מלאכה וצער ולהשרות תחושת חופש, הרמוניה וקדושה.חמשת הלכות השבת מורכבות ושתי מצוות "עשה" ומשלוש מצוות "לא תעשה": לשבות בשביעי – לשבות מכל מלאכה ביום השבת שלא לעשות בו מלאכה שלא לענוש בשבת שלא לצאת חוץ לגבול בשבת לקדש היום בזכירה קבלת שבת | AI: makoמתכון לחלת שבת חשוב מאוד לנפות את הקמח (ולא מטעמי כשרות, זו פרקטיקה) ולא לשכוח את המלח. בצק ללא מלח מתקבל תפל ובלתי אכיל (מלח חשוב גם למאפים מתוקים). אפשר גם ללוש את הבצק 10 דקות בידיים (זמן הלישה חשוב בשביל שהגלוטן בבצק יבנה רשת יציבה ושהבצק יהיה מוכן לתפוח). והכי הכי חשוב: מוציאים את החלות ולא מעיזים לבצוע או לחתוך אותן לפני שהן מתקררות (פתיחת מאפה חם מהתנור הורסת אותו ומותירה אותו בצקי מבפנים. אם אוהבים לאכול חלה כשהיא חמה, פשוט מחממים אותה לפני האכילה). פרסומתהמצרכים (3 מנות): 1 ק״ג קמח מנופה רבע כוס (50 גרם) סוכר רבע כוס (60 מ"ל) שמן 1 כף שמרים יבשים 1 כף מלח 2 וחצי כוסות (600 מ"ל) מים לציפוי: ביצה טרופה קורט מלח קורט סוכר זרעי שומשום אופן ההכנה: מערבבים את כל החומרים מלבד המים כדקה (עד לאיחוד) במיקסר עם וו לישה. יוצקים פנימה את המים ולשים במהירות בינונית כ-6-7 דקות, עד לקבלת כדור בצק. מכסים את הקערה בניילון נצמד ומעליו מניחים מגבת. מתפיחים כ-45 דקות ובודקים את המצב - אם הבצק הכפיל את נפחו ממשיכים, אם לא, נותנים לו עוד רבע שעה. כשהבצק מכפיל את נפחו מחלקים אותו ל-3 חלקים שווים. חוצים כל חלק לשניים, כך שמתקבלים 6 חלקים שווים. קולעים או מעצבים את החלה: יוצרים שני גלילים מאורכים ומניחים בצורת צלב אחד על גבי השני. מתחילים להצליב את הגלילים משני הכיוונים כך שהחלה נקלעת לגובה ואז משכיבים אותה. אפשרות נוספת: חותכים כל גליל ל-4, יוצרים כדורים ומסדרים אותם בצורת כתר. חוזרים על הפעולה פעמיים נוספות, עם שאר הבצק. מתפיחים, מברישים ואופים: מכסים את החלות המעוצבות במגבת ומתפיחים כחצי שעה או עד שהנפח כמעט מכפיל את עצמו והחלות מתעגלות יפה. במקביל מחממים תנור ל-220 מעלות (או 200 בטורבו). מברישים את החלות בביצה טרופה עם מלח וסוכר, מפזרים שומשום ואופים 25 דקות, או עד שהחלות אפויות וזהובות יפה. מצננים לחלוטין ומגישים. AI: makoהדלקת נרות שבתזו היא אחת מהמצוות המוכרות והפופולריות ביותר, אבל מה אתם באמת יודעים עליה? הנה שבע עובדות חשובות על המצווה שפותחת לכם את היום השביעי ועוד עובדת בונוס בסקר שנערך בשנים האחרונות, הצהירו 77% מהנשים הנשאלות כי הן נוהגות להדליק נרות בכניסת שבת, 56% מהן באופן קבוע. על אף שהדלקת נרות שבת מזוהה בעיקר עם נשים, למעשה מדובר בחובה משפחתית ובמידה ואין אישה בבית, באופן זמני או קבוע, חובת ההדלקה מוטלת גם על הגבר. מכיוון שעל פי ההלכה היהודית אסורה הבערת אש בשבת, בעבר שימשו הנרות הדולקים כעיקר התאורה בבית, אולם היום הדלקת הנרות נעשית לרוב רק לשם המצווה. מתי מדליקים? את הנרות מדליקים לפני כניסת השבת כבר ביום שישי בערב, כעשרים דקות לפני שקיעת החמה. אולם למעשה אין שעה קבועה להדלקת נרות השבת. זמני כניסת שבת משתנים משבוע לשבוע, בהתאם לעונות השנה, לאזורים הגיאוגרפיים בארץ וללוח השנה העברי. כל שנשאר לעשות הוא להתעדכן כל פעם מחדש. כמה מדליקים? גם כאן אין תשובה אחידה. באופן עקרוני ניתן לצאת ידי חובה על ידי הדלקת נר אחד אולם מנהג משכבר הימים להדליק לפחות שני נרות - אחד כנגד "זכור" ואחד כנגד "שמור" - שני נוסחים המוזכרים בתנ"ך בהקשר של מצוות השבת. המתקדמים יותר ידליקו נרות כמספר בני המשפחה. ככל שהמשפחה מתרחבת - כך גם האור בבית. בלי עין הרע. איפה מדליקים? גם כאן אין תשובה אחידה. באופן עקרוני ניתן לצאת ידי חובה על ידי הדלקת נר אחד אולם מנהג משכבר הימים להדליק לפחות שני נרות - אחד כנגד "זכור" ואחד כנגד "שמור" - שני נוסחים המוזכרים בתנ"ך בהקשר של מצוות השבת. המתקדמים יותר ידליקו נרות כמספר בני המשפחה. ככל שהמשפחה מתרחבת - כך גם האור בבית. בלי עין הרע. במה מדליקים? בימינו מקובל להדליק נרות שבת באמצעות נרות השעווה המוכרים לכולנו, אולם בעבר היו מדליקים באמצעות שמן ופתילות כפי שהדליקו את המנורה בבית המקדש כשהיה קיים. ברמת העיקרון, אין פסול להדליק נרות שבת בכל דרך, כל עוד אין סכנה שהנר ייכבה וייאלץ את האדם לתקן אותו במהלך השבת. כמו כן חל איסור להשתמש בשמן עם ריח רע, שמן המפיץ ריח טוב ושמן מתנדף שעשוי לגרום לדליקה. הדלקה בשמן זית נחשבת למהודרת ביותר ויש שמדליקים כך עד היום. פרסומתAI: makoהידעתם? בגלל מחלוקת במשמעות ההלכתית של מועד "צאת הכוכבים", יש מי שנוהגים למשוך ולהאריך את השבת ולהוציא אותה בשעה מאוחרת יותר. השעה המאוחרת יותר מהשעה הנקובה בדרך כלל, נובעת מחישוב זמנים אחר אותו קבע רבי יעקב בן מאיר, הקרוי גם 'רבנו תם' וכונן את המושג "זמן רבינו תם" שמתייחס למצוות ולהלכות הקשורות לסוף היום ולתחילת הלילה. נוסח ברכת הדלקת נרות: "ברוך אתה ה' אלוקינו מלך העולם אשר קידשנו במצוותיו וציוונו להדליק נר של שבת". יש שמוסיפים: "יהי רצון מלפניך ה' אלוקיי ואלוקי אבותיי שתחונן אותי ואת אישי (ואת בני ואת אבי ואת אמי) ואת כל קרובי, ותיתן לנו ולכל ישראל חיים טובים וארוכים, ותזכרנו בזיכרון טובה וברכה, ותפקדנו בפקודת ישועה ורחמים, ותברכנו ברכות גדולות, ותשלים ביתנו, ותשכן שכינתך בינינו, וזכנו לגדל בנים ובני בנים, חכמים ונבונים, אוהבי ה', יראי אלוקים, אנשי אמת, זרע קדש, בה' דבקים, ומאירים את העולם בתורה ובמעשים טובים, ובכל מלאכת עבודת הבורא. אנא שמע את תחינתי בעת הזאת, בזכות שרה ורבקה ורחל ולאה אמותינו. האר נרנו שלא יכבה לעולם ועד, והאר פניך ונושעה, אמן".מדוע מדליקים נרות שבת?הדלקת נרות שבת היא מנהג עתיק ימים, המלווה את עם ישראל כבר אלפי שנים. למרות שהסיבה המקורית הייתה פונקציונלית - להאיר את הבית בימים שבהם האור היחיד היה אש - המסורת רוויה במשמעויות רבות ועמוקות.ראשית, הנרות מסמלים את השלווה והאחדות המשפחתית. בעבר, החשכה עלולה הייתה לגרום לבלבול, התנגשויות ואי-נוחות בתוך הבית. האור הנעים של הנרות הדליק לא רק את החלל הפיזי, אלא גם את לבבות בני המשפחה באהבה ואחווה.פרסומתנוסף על כך, נרות השבת מכבדים את קדושת היום ומעניקים לו תחושה של חגיגיות וענג. האור הזוהר מוסיף יופי ומשדרג את חווית הסעודות והמנוחה. בנוסף, הנרות קשורים לתיקון חטאה של חוה הראשונה שכיבתה את "נרו של עולם".יש הרואים בנרות סמל לנשמה הנוספת שאדם מקבל בשבת, בהתאם לפסוק "נר ה' נשמת אדם". בנוסף, חכמים טוענים כי לכל מצווה ישנן סיבות רוחניות נסתרות שאינן ידועות לנו לחלוטין.לבסוף, הדלקת הנרות מביאה לבית הארה רוחנית מיוחדת, מלבד האור הפיזי, ומחברת אותנו לשורשים העמוקים של מסורת ישראל.חשיבות המצווהחכמינו הדגישו את מרכזיותה של מצוות הדלקת הנרות עד כדי כך שקבעו: אדם הנדרש לבחור בין רכישת יין לקידוש או נרות שבת, עדיף שיבחר בנרות. יתרה מזאת, אדם שאין ביכולתו הכלכלית, מונחה לבקש עזרה מאחרים כדי לקיים מצווה זו.שורשי המסורתמקור המצווה נעוץ בדברי חכמים, והיא מעוגנת במסכת שבת. המשנה מקדישה פרק שלם לנושא, ומדגישה את חובת התזכורת לבני הבית להדליק נרות טרם כניסת השבת.משמעות הדלקת הנרותלמצווה זו שלושה טעמים מרכזיים: כבוד השבת - הארת הבית מהווה ביטוי מוחשי לכבוד השבת, כנאמר "וקראת לשבת עונג, לקדוש ה' מכובד" עונג שבת - האור תורם לאווירה חגיגית ומענגת, המעצימה את חווית השבת שלום בית - התאורה מונעת מכשולים ומתחים, ותורמת לאווירה משפחתית נעימה. פרסומתהדלקת נרות שבת בעידן המודרנילמרות קיומה של תאורה חשמלית, הדלקת נרות השבת המסורתית נשמרת בקפידה. האור החם והטבעי של הנרות מעניק ממד רוחני ייחודי שאינו ניתן להחלפה באור מלאכותי.סגולות וברכותרגע הדלקת הנרות נחשב לעת רצון מיוחדת, ומסורת ישראל מייחסת לו סגולות מיוחדות: זכות לבנים תלמידי חכמים הזדמנות לתפילה אישית קירוב הגאולה נשים רבות מנצלות רגע קדוש זה לתפילה מעומק הלב, אם בנוסח קבוע ואם בתפילה אישית, מתוך אמונה בכוחה המיוחד של שעה זו.AI: makoנוסח ברכת הדלקת נרות שבת:"ברוך אתה ה' אלוקינו מלך העולם אשר קידשנו במצוותיו וציוונו להדליק נר של שבת". יש שמוסיפים: "יהי רצון מלפניך ה' אלוקיי ואלוקי אבותיי שתחונן אותי ואת אישי (ואת בני ואת אבי ואת אמי) ואת כל קרובי, ותיתן לנו ולכל ישראל חיים טובים וארוכים, ותזכרנו בזיכרון טובה וברכה, ותפקדנו בפקודת ישועה ורחמים, ותברכנו ברכות גדולות, ותשלים ביתנו, ותשכן שכינתך בינינו, וזכנו לגדל בנים ובני בנים, חכמים ונבונים, אוהבי ה', יראי אלוקים, אנשי אמת, זרע קדש, בה' דבקים, ומאירים את העולם בתורה ובמעשים טובים, ובכל מלאכת עבודת הבורא. אנא שמע את תחינתי בעת הזאת, בזכות שרה ורבקה ורחל ולאה אמותינו. האר נרנו שלא יכבה לעולם ועד, והאר פניך ונושעה, אמן".AI: makoפרסומתיציאת שבת - מדריך מקיףיציאת שבת, או צאת השבת, היא הרגע שבו מסתיימת קדושת היום ומתחיל מוצאי שבת. לפי ההלכה, הזמן המדויק נקבע כאשר נראים בשמים שלושה כוכבים קטנים – סימן לכך שהלילה ירד לחלוטין. ברוב המקומות בישראל, יציאת שבת מתרחשת כ־20–30 דקות אחרי השקיעה, אך יש הבדלים בין ערים: בתל־אביב הזמן מעט מאוחר יותר מאשר בירושלים, ובחיפה היא מתרחשת כמה דקות אחרי המרכז. מיד לאחר יציאת השבת נוהגים לערוך את טקס ההבדלה: כוס יין, בשמים ונר, המהווה סמל למעבר בין השבת לשגרת השבוע. מנהג זה נושא משמעות דתית וחברתית עמוקה, והוא שונה מקהילה לקהילה.כדי לדעת את זמן יציאת השבת המדויק בעירכם, מומלץ להיעזר בלוח זמנים הלכתי המתעדכן לפי שעון קיץ וחורף.מהי יציאת שבת וכיצד נקבע זמנה?יציאת שבת מציינת את סיום יום השבת והמעבר לימי החול. זמן יציאת השבת נקבע לפי "צאת הכוכבים" - כאשר נראים שלושה כוכבים בינוניים ברקיע. ישנן מספר שיטות לחישוב זמן יציאת השבת: צאת הכוכבים הרגיל - 18-20 דקות לאחר שקיעת החמה (משתנה לפי אזור גיאוגרפי) זמן רבנו תם - כ-72 דקות לאחר השקיעה שיטת החזון איש - כ-50 דקות לאחר השקיעה רוב הקהילות והלוחות בישראל מציינים את זמן צאת השבת לפי שיטת צאת הכוכבים הרגיל, אך ישנן קהילות המחמירות ונוהגות לפי זמן רבנו תם או שיטות אחרות.ספר קודש | צילום: סאלי פאראג, shutterstockמדוע זמני יציאת השבת שונים בין הערים?בדומה לזמני כניסת השבת, גם זמני יציאת השבת משתנים בין ערים שונות בישראל. הסיבות לכך הן: הבדלים גיאוגרפיים: מיקום העיר משפיע על זמן השקיעה - ערים מערביות יותר יחוו שקיעה מאוחרת יותר טופוגרפיה: ערים הממוקמות בהרים או בעמקים יחוו שקיעה בזמנים שונים מנהגים מקומיים: בערים מסוימות נוהגים להוסיף זמן נוסף מעבר לצאת הכוכבים הרגיל פרסומתהשוני בזמנים בין הערים יכול להגיע לכ-5-10 דקות, כפי שניתן לראות בטבלאות זמני השבת השבועיות.הבדלה - הטקס המסיים את השבתעם יציאת השבת, מצווה לערוך הבדלה - טקס המסמל את ההבדלה בין קודש לחול. ההבדלה כוללת ארבעה מרכיבים עיקריים המסומנים בראשי התיבות "יבנה": י - יין: מברכים "בורא פרי הגפן" על כוס יין או מיץ ענבים ב - בשמים: מברכים "בורא מיני בשמים" ומריחים בשמים לנחם את הנפש על עזיבת הנשמה היתרה נ - נר: מברכים "בורא מאורי האש" על נר הבדלה (נר שיש לו לפחות שתי פתילות) ה - הבדלה: ברכת "המבדיל בין קודש לחול" נהוג להדר בכוס יין גדולה, להשתמש בבשמים מיוחדים (כגון הדסים, קינמון או ציפורן), ולהדליק נר מיוחד בעל מספר פתילות או שתי נרות שמחברים את להבותיהם.AI: makoנוסח ברכת ההבדלהלהלן נוסח ההבדלה המלא:הנה אל ישועתי אבטח ולא אפחד, כי עזי וזמרת יה ה' ויהי לי לישועה. ושאבתם מים בששון ממעיני הישועה. לה' הישועה על עמך ברכתך סלה. ה' צבאות עמנו משגב לנו אלהי יעקב סלה. ה' צבאות אשרי אדם בוטח בך. ה' הושיעה, המלך יעננו ביום קראנו. ליהודים היתה אורה ושמחה וששון ויקר. כן תהיה לנו. כוס ישועות אשא ובשם ה' אקרא.פרסומתברוך אתה ה' אלהינו מלך העולם בורא פרי הגפן.ברוך אתה ה' אלהינו מלך העולם בורא מיני בשמים.ברוך אתה ה' אלהינו מלך העולם בורא מאורי האש.ברוך אתה ה' אלהינו מלך העולם המבדיל בין קודש לחול, בין אור לחושך, בין ישראל לעמים, בין יום השביעי לששת ימי המעשה. ברוך אתה ה' המבדיל בין קודש לחול.מתי מותר להתחיל במלאכות לאחר השבת?עם יציאת השבת, מותר לחזור ולעשות את כל המלאכות שהיו אסורות במהלך השבת. עם זאת, ישנה חשיבות להבדיל בין קודש לחול לפני עשיית מלאכות: למי שאינו עורך הבדלה מלאה - די באמירת "ברוך המבדיל בין קודש לחול" כדי להתיר עשיית מלאכות מי שאינו אומר כלל את נוסח ההבדלה - מותר בעשיית מלאכות מיד עם צאת השבת, אך מצווה מן המובחר להבדיל תחילה ההלכה קובעת שאין לעשות מלאכות עד לאמירת "ברוך המבדיל בין קודש לחול" או עד לעריכת הבדלה מלאה.מנהגים מיוחדים במוצאי שבתבמוצאי שבת ישנם מספר מנהגים ייחודיים ומסורות מיוחדות:1. סעודת "מלווה מלכה"סעודה רביעית הנערכת במוצאי שבת ללוות את השבת ביציאתה. יש הנוהגים לאכול מאכלים חמים ולשיר זמירות מיוחדות. מסורת זו מקורה באמירה שיש ללוות את השבת בצאתה כפי שמלווים מלך או מלכה חשובים.2. שירת "אליהו הנביא"במוצאי שבת נהוג לשיר "אליהו הנביא" ולספר על בואו של משיח. על פי המסורת, אליהו הנביא יבשר על הגאולה, ומוצאי שבת נחשב לזמן מסוגל לגאולה.3. מנהגי ההבדלה המיוחדים שפיכת יין - נוהגים לשפוך מעט מהיין של ההבדלה לסימן ברכה ושפע כיבוי הנר ביין - נהוג לכבות את נר ההבדלה בשאריות היין שנשפכו לצלחת טבילת האצבעות ביין - יש הנוהגים לטבול אצבעותיהם ביין השפוך ולהעבירן על העיניים או כיסי הבגדים לסימן ברכה 4. אמירת "ויתן לך"רבים נוהגים לומר את פסוקי "ויתן לך" לאחר הבדלה - אוסף פסוקי ברכה מהתנ"ך המבקשים שפע, ברכה והצלחה לשבוע החדש.5. הבשמים וסגולותיהםהשימוש בבשמים במוצאי שבת אינו רק חלק מטקס ההבדלה, אלא גם בעל משמעויות וסגולות: מנחם על עזיבת הנשמה היתרה שניתנה בשבת מרומם את הנפש לקראת השבוע החדש מסמל את הריח הטוב שיש להוציא מהשבת אל ימי החול זמן רבנו תם - למחמירים ביציאת שבתרבים שואלים על "זמן רבנו תם" המוזכר לעיתים בלוחות השנה. זהו זמן יציאת שבת מאוחר יותר, שנקבע על פי שיטתו של רבי יעקב בן מאיר (רבנו תם), נכדו של רש"י, שחי במאה ה-12.לפי שיטה זו, השקיעה שאנו רואים אינה סוף היום ההלכתי, אלא רק תחילת תהליך השקיעה. רבנו תם סבר שיש להוסיף 72 דקות נוספות אחרי השקיעה הנראית עד לסיום השבת.יש קהילות וחסידויות שמחמירות ונוהגות לפי זמן רבנו תם תמיד, וישנם רבים שנוהגים להימנע ממלאכות מסוימות (כגון נסיעה) עד לזמן רבנו תם, אך מתירים מלאכות קלות אחרי צאת הכוכבים הרגיל."שבוע טוב" - המעבר משבת לשגרההמעבר משבת לימות החול הוא הזדמנות להתחדשות. רבים נוהגים לברך זה את זה ב"שבוע טוב" במוצאי שבת, בתקווה שברכת השבת תשפיע על השבוע כולו.מסורת ישראל מלמדת שברכת השבת מתפשטת לימי השבוע, ואדם שזכה לשמור שבת כהלכתה, יזכה לשבוע של שפע וברכה. יציאת השבת היא לא רק סיום טכני של יום המנוחה, אלא מעבר מהותי מקודש לחול, המלווה בטקסים ומנהגים המסייעים לנו לשמר משהו מקדושת השבת גם בימי המעשה. ההבדלה וסעודת מלווה מלכה מסמלות את רצוננו להמשיך ולהיות מושפעים מאווירת השבת גם בשבוע החדש העומד בפתח. פרסומתזמנים הלכתייםרוצים לדעת מתי עלות השחר ומתי זמן ציצית ותפילין בעיר מגוריכם? במאקו תמצאו את זמני היום ההלכתיים עבור ערי ישראל השונות. פשוט בחרו במערכת את עיר מגוריכם וצפו ברשימת הזמנים המקובלים באזור.>> לוח זמני היוםאיזה מתכונים כדאי להכין בשבת הקרובה?אנו מזמינים אתכם להיכנס למתחם מתכוני השבת שלנו ולהתעדכן במגוון רחב של סוגי תבשילים, מנות ראשונות, עיקריות וקינוחים, המתאימים בדיוק למזג האוויר ולאווירה של השבת הקרובה>> ארוחת שבתארוחת שישי | צילום: אפיק גבאי, סטיילינג: דיאנה לינדרבאיזו מסעדה כדאי לבקר בשבת הקרובה?מחפשים מסעדה מעולה לבקר בה בסוף השבוע? היכנסו לפינת האוכל של מבקר המסעדות ניר מאולבוגט במאקו וגלו את מיטב המסעדות בכל רחבי הארץ.>> פינת אוכלAI: makoעדכוני חדשות בזמן אמת - גם בסוף השבוערוצים להתעדכן בחדשות הכי חמות גם בסוף השבוע? הצטרפו ללמעלה ממיליון גולשים שכבר הורידו את V1 - אפליקציית סרטוני חדשות קצרים מבית שידורי קשת.>> V1AI: makoפרסומתאיזו מוזיקה לשמוע בשבת הקרובה?אנו מזמינים אתכם להיכנס למצעד המוזיקה השבועי של מאקו ולהתעדכן בכל להיטי השבוע החולף במצעד הישראלי ובמצעד הבינלאומי. כמו כן תוכלו להאזין לרשימת הטופ -100 שעשו את השבוע (ישראלי ולועזי כאחד) ישירות מהספוטיפיי.>> היטליסט - המצעד השבועי של ישראלצילום: makoמה לקרוא בשבת הקרובה?התעדכנו בכל הסיפורים החמים במגוון עולמות תוכן שונים החל ממתכונים מומלצים לשבת הקרובה, דרך אופנה, טורי דעה ועד לכתבות עומק עם האישים המעניינים ביותר בישראל.>> למגזין סוף השבוע של מאקולאיזה פודקאסט להאזין בשבת הקרובה?אנו מזמינים אתכם להאזין למגוון הפודקאסטים הפופולאריים מבית מאקו כגון: בזמן שעבדתם עם דרור גלוברמן ודני פלד, Wako הפודקאסט, אחד ביום עם אלעד שמחיוף ועוד.פרסומת>> למתחם הפודקאסטים שלנומה לראות בטלוויזיה בשבת הקרובהרוצים לעשות בינג' על סדרה ולא יודעים איזו סדרה לבחור? מחכים להשלים את כל פרקי השבוע של אחת מתוכניות קשת? היכנסו למתחם "מה רואים היום" כדי למצוא סדרות ראויות לבינג' בהתאמה אישית ול-12+ בכדי לבצע השלמות צפייה של תכני קשת השונים.AI: makoטיול לשבת - 20-21/02/2026רוצים לנסוע לטיול בשבת הקרובה ולא יודעים לאן? אנו במאקו שמחים להציג את פינת טיול לשבת: כל המקומות ששווה לבקר בהם בעת הזו:שמורת פורהבין קריית גת לצומת בית קמה, במרחק קצר מכביש 40, מסתתרת שמורת פורה – אחת ההפתעות הבולטות של צפון הנגב בעונה הנוכחית. גבעות ירוקות, מאגר מים עונתי, תל קדום ושרידים ארכיאולוגיים נפגשים במסלול מעגלי נוח באורך של עד ארבעה קילומטרים, המאפשר טיול משפחתי רגוע בלב מרבדי כלניות ופריחה צבעונית.פרסומתפסטיבל דרום בלבהכל ירוק ופורח, פסטיבל "דרום בלב" יצא לדרך והתושבים מחכים שנגיע ונחזיר קצת נורמליות לאזור. זה בדיוק הזמן לטייל באזור עוטף עזה, ויש לנו כמה המלצות: החל מעגלת קפה, דרך חנויות מקומיות ובתרונות בארי ועד לאנדרטאות השונות.>> למסלולי הטיול המלאיםAI: makoתחזית אסטרולוגית לשבוע הקרוב -15-21/02/2026AI: makoפרסומתמזל דלי - תחזית שבועית: ראשון עד שלישי: אתם במצב רוח רומנטי כפי שזמן רב לא הייתם. נימה אופטימית גורמת לכל מה שקורה לכם להתפרש לכיוון הרצוי לכם. אתם נרגשים משפע ההצעות שמגיעות אליכם. הלב רוצה אהבה וכמה שיותר, יותר טוב. אל תחמיצו את ההזדמנויות שעומדות בדרך. בעבודה, כדאי לדחות את כל המשימות שאינן דחופות ממש. אתם לא בשיא הריכוז.רביעי עד שבת: זה פרק זמן מעייף בו אתם עסוקים בעניינים כאלה או אחרים, ומנהלים כל העת ויכוחים ומשא מתן עם יריב ראוי בצד השני. אל תיפלו למלכודת של כוחניות תחת המסווה של לעשות עסקים על הצד הטוב ביותר. סמכו גם על האינטואיציות שלכם לגבי האנשים המעורבים. העיקר שתשמרו על יושר פנימי ועמידה בלוח זמנים. קרובי משפחה עלולים להפגין התנהגות כפייתית. מזל דגים - תחזית שבועית:ראשון עד שלישי: זה הזמן שלכם לפרוץ קדימה ואתם מרגישים את זה בעצמות. יש לכם תוכניות מפה ועד להודעה חדשה אבל ייתכן כי אין לכם מספיק כסף כדי להגשים את התוכניות הגרנדיוזיות. המגבלות יובילו אתכם לצמצום האפשרויות עד שתבחרו בדרך המציאותית האפשרית. אל תיכנעו לאנשים שיש להם פנטזיות גדולות שמנסים להפעיל מניפולציות על חשבון אחרים. רביעי עד שבת: למרות החריצות המאפיינת אתכם, ברגע של מבחן, יש לכם נטייה לבחור בדרך הקלה. להתמודד עם קשיים זה לא בדיוק הקטע שלכם לאחרונה, בעיקר כשמדובר בנושאים גשמיים. אתם נהנים לשחק אותה ולהראות לכולם שאתם חיים בספירה אחרת, גבוהה יותר מכולם. רוחניות מאוד חשוב לכם ולעיתים אתם משכנעים את עצמכם שזה הכי חשוב בחיים. מזל טלה - תחזית שבועית:ראשון עד שלישי: אתם מעט מתוחים וזה נובע מן הידיעה שמישהו מעמיד אתכם במבחן. זה הזמן המתאים לעבוד על הביטחון העצמי. מה שתקרינו יתקבל בחזרה כיחס מן הסביבה הקרובה והרחוקה. מצאו זמן להקדיש לפעילות ספורטיבית על מנת להוציא רגשות תוקפנות. במקום להתפרץ נסו להירגע ושמרו את הרעיונות המהפכניים שלכם לעצמכם, לפחות בשלב זה. רביעי עד שבת: אתם מרגישים צורך חזק במיוחד והתעניינות בנושאים של תרבות ורוחניות. האינטלקט שלכם צמא למידע חדש וליציאה מהשגרה. הרעיון של לימודים שוב עולה על הפרק. שתפו את בני המשפחה ברגשותיכם ובתהליכים שאתם עוברים. מבחינה רומנטית יחול שיפור אחרי שתחליטו. השקט הפנימי יקרין לטובה על כל מי שנמצא בסביבה.פרסומת>> לתחזית השבועית של יתר המזלותשינויים בתחבורה הציבורית במהלך סוף השבוערכבת ישראללקבלת מידע על זמני הרכבות האחרונות בימי שישי והרכבות הראשונות במוצאי שבת יש להיכנס לאתר רכבת ישראל.>> רכבת ישראלצילום: רכבת ישראלאוטובוסיםלקבלת מידע על זמני האוטובוסים האחרונים בימי שישי והאוטובוסים הראשונים במוצאי שבת יש להיכנס לאתר הרשות הארצית לתחבורה ציבורית.>> הרשות הארצית לתחבורה ציבוריתAI: makoלקבלת מידע על מערכי ההיסעים בסופי השבוע של הרשויות המקומיות יש להיכנס לאתר נעים בסופ"ש.>> נעים בסופ"שהדלקת נרותפרשת השבועשבתשמירת שבתמצאתם טעות לשון? כניסת שבת, זמני יציאת שבת ומועדי הדלקת נרות - 20.02.2026 זמני כניסת שבת פרשת תרומה - יציאת שבת, מועדי הדלקת נרות, זמני הדלקת נרות וצאת שבת בערים השונות בארץ ובעולם ורשימת בתי כנסת בכל עיר ועיר. שבת שלום פרשת השבוע היא פרשת תרומה, והיא הפרשה השביעית בספר שמות. הפרשה עוסקת כולה בבניית המשכן, שהוא המרכז הרוחני שליווה את העם במסע של 40 שנה במדבר. התורה מצווה אותנו לבנות בכל מקום מרכז רוחני, כמו בית כנסת, והעם לא חיכה עד שהגיע לארץ ישראל ובנה את בית המקדש. תמיד צריך מקום קדוש שהולך איתנו. אחרי יציאת מצרים, קריעת ים סוף וקבלת התורה בהר סיני – יש בפרשה הזו שינוי כיוון: עכשיו אלוקים דורש מאיתנו להתחיל לפעול ולעשות. לא רק לקבל מתנות ושפע של חסדים ממנו, אלא לבצע דברים בעצמנו. לתרום למשכן ולבנות אותו. בריאת העולם מתוארת בתורה ב-30 פסוקים בערך, ובניית המשכן מתוארת בכ-400 פסוקים. פרשנינו מסבירים שהתורה אינה ספר היסטוריה או מדע, היא לא עוסקת בעולם אלא במה האדם צריך לעשות בעולם הזה. זה העיקר. שישי בהיר. תחול עלייה בטמפרטורות וירידה באחוזי הלחות, ויהיה חם מהרגיל לעונה. ישרור אובך. בשעות אחר הצהריים ינשבו רוחות צפוניות ערות לאורך מישור החוף. שבת מעונן חלקית עד בהיר עם ירידה בטמפרטורות. למרות זאת, עדיין יהיה חם מהרגיל לעונה, בעיקר בפנים הארץ ובהרים. האם מותר לאכול אחרי כניסת שבת? נוהגים לקדש בעת כניסת השבת, לפני תחילת הארוחה. בוצעים את החלה ואז מתחילים את השבת. איפה מומלץ להניח את נרות השבת? יש כאלו שמקפידים לשים את הנרות על שולחן השבת. אם יש לכם ילדים קטנים עדיף לשים את הנרות במקום גבוה. איך נקבע זמן כניסת שבת? בירושלים נוהגים להדליק נרות 40 דקות לפני השקיעה. בחיפה נוהגים להדליק נרות 30 דקות לפני השקיעה וברוב המקומות – 20 דקות לפני השקיעה. האם מותר לשחק במשחקי קופסה בשבת? כן. למי שלא מחמיר מותר. האם מותר להתקלח בשבת? בעיקרון לא למי שמחמיר. מותר לשטוף רק את הפנים, הידיים והרגליים במים שחוממו מערב שבת. האם מותר לתת מתנה בשבת? מותר רק אם יש למתנה שימוש בשבת. האם מותר לרכוב על אופניים בשבת? בעיקרון לא. עם זאת, לילדים קטנים מותר. האם מותר לאכול לאחר כניסת השבת? מרגע שנכנסה השבת אזי יש להימנע ממזון ומשתייה עד לאחר הקידוש. מדוע זמני כניסת השבת משתנים מעיר לעיר בארץ? הסיבה לכך נעוצה במנהגים שונים - בעוד שלפי נוהג ירושלים מדליקים את נרות השבת כ-40 דקות לפני השקיעה, לפי נוהג חיפה מדליקים את נרות השבת כ-30 דקות לפני השקיעה. לעומת זאת בערים רבות מדליקים את הנרות רק כ-20 דקות לפני השקיעה. כך, ניתן למצוא הבדלים בשעת כניסת השבת בין ערים שונות. האם מותר לקבל את השבת לפני הזמן? זוהי מצווה להוסיף מהחול על הקודש ולקבל את השבת לפני השקיעה. עד מתי מותר להדליק נרות שבת? היות והדעות חלוקות לגבי העיתוי המדויק של כניסת השבת - שעת השקיעה לעומת שעת צאת הכוכבים, יש לקבל את השבת כמה דקות לפני השקיעה. ברוב הערים נהוג להדליק את הנרות לפחות 20 דקות לפני השקיעה (בירושלים 40 דקות ובחיפה 30 דקות לפני השקיעה). ביום שישי לאחר כניסת השבת ביום שבת עצמו: כחלק מייחוד יום השבת מיתר ימי השבוע ישנם שלושה אופני התקדשות המבדלים את השבת מחול – מעשה, דיבור ומחשבה. זאת במטרה לשחרר אותנו מכל מלאכה וצער ולהשרות תחושת חופש, הרמוניה וקדושה. חמשת הלכות השבת מורכבות ושתי מצוות "עשה" ומשלוש מצוות "לא תעשה": המצרכים (3 מנות): לציפוי: אופן ההכנה: זו היא אחת מהמצוות המוכרות והפופולריות ביותר, אבל מה אתם באמת יודעים עליה? הנה שבע עובדות חשובות על המצווה שפותחת לכם את היום השביעי ועוד עובדת בונוס הידעתם? בגלל מחלוקת במשמעות ההלכתית של מועד "צאת הכוכבים", יש מי שנוהגים למשוך ולהאריך את השבת ולהוציא אותה בשעה מאוחרת יותר. השעה המאוחרת יותר מהשעה הנקובה בדרך כלל, נובעת מחישוב זמנים אחר אותו קבע רבי יעקב בן מאיר, הקרוי גם 'רבנו תם' וכונן את המושג "זמן רבינו תם" שמתייחס למצוות ולהלכות הקשורות לסוף היום ולתחילת הלילה. נוסח ברכת הדלקת נרות: "ברוך אתה ה' אלוקינו מלך העולם אשר קידשנו במצוותיו וציוונו להדליק נר של שבת". יש שמוסיפים: "יהי רצון מלפניך ה' אלוקיי ואלוקי אבותיי שתחונן אותי ואת אישי (ואת בני ואת אבי ואת אמי) ואת כל קרובי, ותיתן לנו ולכל ישראל חיים טובים וארוכים, ותזכרנו בזיכרון טובה וברכה, ותפקדנו בפקודת ישועה ורחמים, ותברכנו ברכות גדולות, ותשלים ביתנו, ותשכן שכינתך בינינו, וזכנו לגדל בנים ובני בנים, חכמים ונבונים, אוהבי ה', יראי אלוקים, אנשי אמת, זרע קדש, בה' דבקים, ומאירים את העולם בתורה ובמעשים טובים, ובכל מלאכת עבודת הבורא. אנא שמע את תחינתי בעת הזאת, בזכות שרה ורבקה ורחל ולאה אמותינו. האר נרנו שלא יכבה לעולם ועד, והאר פניך ונושעה, אמן". הדלקת נרות שבת היא מנהג עתיק ימים, המלווה את עם ישראל כבר אלפי שנים. למרות שהסיבה המקורית הייתה פונקציונלית - להאיר את הבית בימים שבהם האור היחיד היה אש - המסורת רוויה במשמעויות רבות ועמוקות. ראשית, הנרות מסמלים את השלווה והאחדות המשפחתית. בעבר, החשכה עלולה הייתה לגרום לבלבול, התנגשויות ואי-נוחות בתוך הבית. האור הנעים של הנרות הדליק לא רק את החלל הפיזי, אלא גם את לבבות בני המשפחה באהבה ואחווה. נוסף על כך, נרות השבת מכבדים את קדושת היום ומעניקים לו תחושה של חגיגיות וענג. האור הזוהר מוסיף יופי ומשדרג את חווית הסעודות והמנוחה. בנוסף, הנרות קשורים לתיקון חטאה של חוה הראשונה שכיבתה את "נרו של עולם". יש הרואים בנרות סמל לנשמה הנוספת שאדם מקבל בשבת, בהתאם לפסוק "נר ה' נשמת אדם". בנוסף, חכמים טוענים כי לכל מצווה ישנן סיבות רוחניות נסתרות שאינן ידועות לנו לחלוטין. לבסוף, הדלקת הנרות מביאה לבית הארה רוחנית מיוחדת, מלבד האור הפיזי, ומחברת אותנו לשורשים העמוקים של מסורת ישראל. חשיבות המצווה חכמינו הדגישו את מרכזיותה של מצוות הדלקת הנרות עד כדי כך שקבעו: אדם הנדרש לבחור בין רכישת יין לקידוש או נרות שבת, עדיף שיבחר בנרות. יתרה מזאת, אדם שאין ביכולתו הכלכלית, מונחה לבקש עזרה מאחרים כדי לקיים מצווה זו. שורשי המסורת מקור המצווה נעוץ בדברי חכמים, והיא מעוגנת במסכת שבת. המשנה מקדישה פרק שלם לנושא, ומדגישה את חובת התזכורת לבני הבית להדליק נרות טרם כניסת השבת. משמעות הדלקת הנרות למצווה זו שלושה טעמים מרכזיים: הדלקת נרות שבת בעידן המודרני למרות קיומה של תאורה חשמלית, הדלקת נרות השבת המסורתית נשמרת בקפידה. האור החם והטבעי של הנרות מעניק ממד רוחני ייחודי שאינו ניתן להחלפה באור מלאכותי. סגולות וברכות רגע הדלקת הנרות נחשב לעת רצון מיוחדת, ומסורת ישראל מייחסת לו סגולות מיוחדות: נשים רבות מנצלות רגע קדוש זה לתפילה מעומק הלב, אם בנוסח קבוע ואם בתפילה אישית, מתוך אמונה בכוחה המיוחד של שעה זו. "ברוך אתה ה' אלוקינו מלך העולם אשר קידשנו במצוותיו וציוונו להדליק נר של שבת". יש שמוסיפים: "יהי רצון מלפניך ה' אלוקיי ואלוקי אבותיי שתחונן אותי ואת אישי (ואת בני ואת אבי ואת אמי) ואת כל קרובי, ותיתן לנו ולכל ישראל חיים טובים וארוכים, ותזכרנו בזיכרון טובה וברכה, ותפקדנו בפקודת ישועה ורחמים, ותברכנו ברכות גדולות, ותשלים ביתנו, ותשכן שכינתך בינינו, וזכנו לגדל בנים ובני בנים, חכמים ונבונים, אוהבי ה', יראי אלוקים, אנשי אמת, זרע קדש, בה' דבקים, ומאירים את העולם בתורה ובמעשים טובים, ובכל מלאכת עבודת הבורא. אנא שמע את תחינתי בעת הזאת, בזכות שרה ורבקה ורחל ולאה אמותינו. האר נרנו שלא יכבה לעולם ועד, והאר פניך ונושעה, אמן". יציאת שבת, או צאת השבת, היא הרגע שבו מסתיימת קדושת היום ומתחיל מוצאי שבת. לפי ההלכה, הזמן המדויק נקבע כאשר נראים בשמים שלושה כוכבים קטנים – סימן לכך שהלילה ירד לחלוטין. ברוב המקומות בישראל, יציאת שבת מתרחשת כ־20–30 דקות אחרי השקיעה, אך יש הבדלים בין ערים: בתל־אביב הזמן מעט מאוחר יותר מאשר בירושלים, ובחיפה היא מתרחשת כמה דקות אחרי המרכז. מיד לאחר יציאת השבת נוהגים לערוך את טקס ההבדלה: כוס יין, בשמים ונר, המהווה סמל למעבר בין השבת לשגרת השבוע. מנהג זה נושא משמעות דתית וחברתית עמוקה, והוא שונה מקהילה לקהילה. כדי לדעת את זמן יציאת השבת המדויק בעירכם, מומלץ להיעזר בלוח זמנים הלכתי המתעדכן לפי שעון קיץ וחורף. יציאת שבת מציינת את סיום יום השבת והמעבר לימי החול. זמן יציאת השבת נקבע לפי "צאת הכוכבים" - כאשר נראים שלושה כוכבים בינוניים ברקיע. ישנן מספר שיטות לחישוב זמן יציאת השבת: רוב הקהילות והלוחות בישראל מציינים את זמן צאת השבת לפי שיטת צאת הכוכבים הרגיל, אך ישנן קהילות המחמירות ונוהגות לפי זמן רבנו תם או שיטות אחרות. בדומה לזמני כניסת השבת, גם זמני יציאת השבת משתנים בין ערים שונות בישראל. הסיבות לכך הן: השוני בזמנים בין הערים יכול להגיע לכ-5-10 דקות, כפי שניתן לראות בטבלאות זמני השבת השבועיות. עם יציאת השבת, מצווה לערוך הבדלה - טקס המסמל את ההבדלה בין קודש לחול. ההבדלה כוללת ארבעה מרכיבים עיקריים המסומנים בראשי התיבות "יבנה": נהוג להדר בכוס יין גדולה, להשתמש בבשמים מיוחדים (כגון הדסים, קינמון או ציפורן), ולהדליק נר מיוחד בעל מספר פתילות או שתי נרות שמחברים את להבותיהם. להלן נוסח ההבדלה המלא: הנה אל ישועתי אבטח ולא אפחד, כי עזי וזמרת יה ה' ויהי לי לישועה. ושאבתם מים בששון ממעיני הישועה. לה' הישועה על עמך ברכתך סלה. ה' צבאות עמנו משגב לנו אלהי יעקב סלה. ה' צבאות אשרי אדם בוטח בך. ה' הושיעה, המלך יעננו ביום קראנו. ליהודים היתה אורה ושמחה וששון ויקר. כן תהיה לנו. כוס ישועות אשא ובשם ה' אקרא. ברוך אתה ה' אלהינו מלך העולם בורא פרי הגפן. ברוך אתה ה' אלהינו מלך העולם בורא מיני בשמים. ברוך אתה ה' אלהינו מלך העולם בורא מאורי האש. ברוך אתה ה' אלהינו מלך העולם המבדיל בין קודש לחול, בין אור לחושך, בין ישראל לעמים, בין יום השביעי לששת ימי המעשה. ברוך אתה ה' המבדיל בין קודש לחול. עם יציאת השבת, מותר לחזור ולעשות את כל המלאכות שהיו אסורות במהלך השבת. עם זאת, ישנה חשיבות להבדיל בין קודש לחול לפני עשיית מלאכות: ההלכה קובעת שאין לעשות מלאכות עד לאמירת "ברוך המבדיל בין קודש לחול" או עד לעריכת הבדלה מלאה. במוצאי שבת ישנם מספר מנהגים ייחודיים ומסורות מיוחדות: 1. סעודת "מלווה מלכה" סעודה רביעית הנערכת במוצאי שבת ללוות את השבת ביציאתה. יש הנוהגים לאכול מאכלים חמים ולשיר זמירות מיוחדות. מסורת זו מקורה באמירה שיש ללוות את השבת בצאתה כפי שמלווים מלך או מלכה חשובים. 2. שירת "אליהו הנביא" במוצאי שבת נהוג לשיר "אליהו הנביא" ולספר על בואו של משיח. על פי המסורת, אליהו הנביא יבשר על הגאולה, ומוצאי שבת נחשב לזמן מסוגל לגאולה. 3. מנהגי ההבדלה המיוחדים 4. אמירת "ויתן לך" רבים נוהגים לומר את פסוקי "ויתן לך" לאחר הבדלה - אוסף פסוקי ברכה מהתנ"ך המבקשים שפע, ברכה והצלחה לשבוע החדש. 5. הבשמים וסגולותיהם השימוש בבשמים במוצאי שבת אינו רק חלק מטקס ההבדלה, אלא גם בעל משמעויות וסגולות: רבים שואלים על "זמן רבנו תם" המוזכר לעיתים בלוחות השנה. זהו זמן יציאת שבת מאוחר יותר, שנקבע על פי שיטתו של רבי יעקב בן מאיר (רבנו תם), נכדו של רש"י, שחי במאה ה-12. לפי שיטה זו, השקיעה שאנו רואים אינה סוף היום ההלכתי, אלא רק תחילת תהליך השקיעה. רבנו תם סבר שיש להוסיף 72 דקות נוספות אחרי השקיעה הנראית עד לסיום השבת. יש קהילות וחסידויות שמחמירות ונוהגות לפי זמן רבנו תם תמיד, וישנם רבים שנוהגים להימנע ממלאכות מסוימות (כגון נסיעה) עד לזמן רבנו תם, אך מתירים מלאכות קלות אחרי צאת הכוכבים הרגיל. המעבר משבת לימות החול הוא הזדמנות להתחדשות. רבים נוהגים לברך זה את זה ב"שבוע טוב" במוצאי שבת, בתקווה שברכת השבת תשפיע על השבוע כולו. מסורת ישראל מלמדת שברכת השבת מתפשטת לימי השבוע, ואדם שזכה לשמור שבת כהלכתה, יזכה לשבוע של שפע וברכה. יציאת השבת היא לא רק סיום טכני של יום המנוחה, אלא מעבר מהותי מקודש לחול, המלווה בטקסים ומנהגים המסייעים לנו לשמר משהו מקדושת השבת גם בימי המעשה. ההבדלה וסעודת מלווה מלכה מסמלות את רצוננו להמשיך ולהיות מושפעים מאווירת השבת גם בשבוע החדש העומד בפתח. רוצים לדעת מתי עלות השחר ומתי זמן ציצית ותפילין בעיר מגוריכם? במאקו תמצאו את זמני היום ההלכתיים עבור ערי ישראל השונות. פשוט בחרו במערכת את עיר מגוריכם וצפו ברשימת הזמנים המקובלים באזור. >> לוח זמני היום אנו מזמינים אתכם להיכנס למתחם מתכוני השבת שלנו ולהתעדכן במגוון רחב של סוגי תבשילים, מנות ראשונות, עיקריות וקינוחים, המתאימים בדיוק למזג האוויר ולאווירה של השבת הקרובה >> ארוחת שבת מחפשים מסעדה מעולה לבקר בה בסוף השבוע? היכנסו לפינת האוכל של מבקר המסעדות ניר מאולבוגט במאקו וגלו את מיטב המסעדות בכל רחבי הארץ. >> פינת אוכל רוצים להתעדכן בחדשות הכי חמות גם בסוף השבוע? הצטרפו ללמעלה ממיליון גולשים שכבר הורידו את V1 - אפליקציית סרטוני חדשות קצרים מבית שידורי קשת. >> V1 אנו מזמינים אתכם להיכנס למצעד המוזיקה השבועי של מאקו ולהתעדכן בכל להיטי השבוע החולף במצעד הישראלי ובמצעד הבינלאומי. כמו כן תוכלו להאזין לרשימת הטופ -100 שעשו את השבוע (ישראלי ולועזי כאחד) ישירות מהספוטיפיי. >> היטליסט - המצעד השבועי של ישראל התעדכנו בכל הסיפורים החמים במגוון עולמות תוכן שונים החל ממתכונים מומלצים לשבת הקרובה, דרך אופנה, טורי דעה ועד לכתבות עומק עם האישים המעניינים ביותר בישראל. >> למגזין סוף השבוע של מאקו אנו מזמינים אתכם להאזין למגוון הפודקאסטים הפופולאריים מבית מאקו כגון: בזמן שעבדתם עם דרור גלוברמן ודני פלד, Wako הפודקאסט, אחד ביום עם אלעד שמחיוף ועוד. >> למתחם הפודקאסטים שלנו רוצים לעשות בינג' על סדרה ולא יודעים איזו סדרה לבחור? מחכים להשלים את כל פרקי השבוע של אחת מתוכניות קשת? היכנסו למתחם "מה רואים היום" כדי למצוא סדרות ראויות לבינג' בהתאמה אישית ול-12+ בכדי לבצע השלמות צפייה של תכני קשת השונים. רוצים לנסוע לטיול בשבת הקרובה ולא יודעים לאן? אנו במאקו שמחים להציג את פינת טיול לשבת: כל המקומות ששווה לבקר בהם בעת הזו: בין קריית גת לצומת בית קמה, במרחק קצר מכביש 40, מסתתרת שמורת פורה – אחת ההפתעות הבולטות של צפון הנגב בעונה הנוכחית. גבעות ירוקות, מאגר מים עונתי, תל קדום ושרידים ארכיאולוגיים נפגשים במסלול מעגלי נוח באורך של עד ארבעה קילומטרים, המאפשר טיול משפחתי רגוע בלב מרבדי כלניות ופריחה צבעונית. הכל ירוק ופורח, פסטיבל "דרום בלב" יצא לדרך והתושבים מחכים שנגיע ונחזיר קצת נורמליות לאזור. זה בדיוק הזמן לטייל באזור עוטף עזה, ויש לנו כמה המלצות: החל מעגלת קפה, דרך חנויות מקומיות ובתרונות בארי ועד לאנדרטאות השונות. >> למסלולי הטיול המלאים מזל דלי - תחזית שבועית: ראשון עד שלישי: אתם במצב רוח רומנטי כפי שזמן רב לא הייתם. נימה אופטימית גורמת לכל מה שקורה לכם להתפרש לכיוון הרצוי לכם. אתם נרגשים משפע ההצעות שמגיעות אליכם. הלב רוצה אהבה וכמה שיותר, יותר טוב. אל תחמיצו את ההזדמנויות שעומדות בדרך. בעבודה, כדאי לדחות את כל המשימות שאינן דחופות ממש. אתם לא בשיא הריכוז.רביעי עד שבת: זה פרק זמן מעייף בו אתם עסוקים בעניינים כאלה או אחרים, ומנהלים כל העת ויכוחים ומשא מתן עם יריב ראוי בצד השני. אל תיפלו למלכודת של כוחניות תחת המסווה של לעשות עסקים על הצד הטוב ביותר. סמכו גם על האינטואיציות שלכם לגבי האנשים המעורבים. העיקר שתשמרו על יושר פנימי ועמידה בלוח זמנים. קרובי משפחה עלולים להפגין התנהגות כפייתית. מזל דגים - תחזית שבועית: ראשון עד שלישי: זה הזמן שלכם לפרוץ קדימה ואתם מרגישים את זה בעצמות. יש לכם תוכניות מפה ועד להודעה חדשה אבל ייתכן כי אין לכם מספיק כסף כדי להגשים את התוכניות הגרנדיוזיות. המגבלות יובילו אתכם לצמצום האפשרויות עד שתבחרו בדרך המציאותית האפשרית. אל תיכנעו לאנשים שיש להם פנטזיות גדולות שמנסים להפעיל מניפולציות על חשבון אחרים. רביעי עד שבת: למרות החריצות המאפיינת אתכם, ברגע של מבחן, יש לכם נטייה לבחור בדרך הקלה. להתמודד עם קשיים זה לא בדיוק הקטע שלכם לאחרונה, בעיקר כשמדובר בנושאים גשמיים. אתם נהנים לשחק אותה ולהראות לכולם שאתם חיים בספירה אחרת, גבוהה יותר מכולם. רוחניות מאוד חשוב לכם ולעיתים אתם משכנעים את עצמכם שזה הכי חשוב בחיים. מזל טלה - תחזית שבועית: ראשון עד שלישי: אתם מעט מתוחים וזה נובע מן הידיעה שמישהו מעמיד אתכם במבחן. זה הזמן המתאים לעבוד על הביטחון העצמי. מה שתקרינו יתקבל בחזרה כיחס מן הסביבה הקרובה והרחוקה. מצאו זמן להקדיש לפעילות ספורטיבית על מנת להוציא רגשות תוקפנות. במקום להתפרץ נסו להירגע ושמרו את הרעיונות המהפכניים שלכם לעצמכם, לפחות בשלב זה. רביעי עד שבת: אתם מרגישים צורך חזק במיוחד והתעניינות בנושאים של תרבות ורוחניות. האינטלקט שלכם צמא למידע חדש וליציאה מהשגרה. הרעיון של לימודים שוב עולה על הפרק. שתפו את בני המשפחה ברגשותיכם ובתהליכים שאתם עוברים. מבחינה רומנטית יחול שיפור אחרי שתחליטו. השקט הפנימי יקרין לטובה על כל מי שנמצא בסביבה. >> לתחזית השבועית של יתר המזלות רכבת ישראל לקבלת מידע על זמני הרכבות האחרונות בימי שישי והרכבות הראשונות במוצאי שבת יש להיכנס לאתר רכבת ישראל. >> רכבת ישראל אוטובוסים לקבלת מידע על זמני האוטובוסים האחרונים בימי שישי והאוטובוסים הראשונים במוצאי שבת יש להיכנס לאתר הרשות הארצית לתחבורה ציבורית. >> הרשות הארצית לתחבורה ציבורית לקבלת מידע על מערכי ההיסעים בסופי השבוע של הרשויות המקומיות יש להיכנס לאתר נעים בסופ"ש. >> נעים בסופ"ש |
======================================== |
[SOURCE: https://www.theverge.com/wearables] | [TOKENS: 1266] |
Wearable The Verge is covering the rapidly evolving world of wearables. We test everything from smartwatches like the Apple Watch, to smart glasses like the Meta Ray-Bans, to fitness trackers like the Oura Ring to find out which ones deliver on their promises. Follow along to find out whether covering our bodies in screens and sensors can actually make us smarter and healthier. Amid reports that Meta is preparing to release a smartwatch later this year, one Verge commenter has already figured out what the social media giant is going to do with all that new data. jeffehobbs: People To Follow Who Have Low 𝑆𝑝𝑂2 Levels Like You >>[show less] Get the day’s best comment and more in my free newsletter, The Verge Daily. Oura is lobbying for relaxed wearables regulation. It has a point, but is regulation even the problem here? Remember when EssilorLuxottica said it sold 2 million and would hit 10 million a year by 2027? 10M seems well within reach. “In 2025, we sold more than 7 million units of AI glasses, posting exponential growth,” said CEO Francesco Milleri. Prices may stay high in the short term, though, they hinted on the earnings call. Sega has partnered with Seiko to make a limited edition 65th anniversary watch with a subtle Sonic the Hedgehog motif, though he may not be the best character to associate with a timepiece. Lewise: Shame it’ll always run fast Get the day’s best comment and more in my free newsletter, The Verge Daily. The two companies have collaborated on a new timepiece commemorating Sega’s 65th anniversary last year. Available in a black or silver finish the watch’s face features the hours in a font matching the Sega logo found below Seiko’s, with a Sonic silhouette can be found on a subdial. They’re 71,500 yen each, or around $458. Correction, February 9th: An image caption in an earlier version of this article misstated the watch uses an automatic movement. It features a quartz movement. This is a great read about Runna — a popular running app that was bought by Strava last year. While many runners swear by it, several reported injuries from using the AI-powered running coach. (Including yours truly.) Runna’s now rolling out easier programs, which I’m going to start testing once this horrible cold snap lets up. [Wall Street Journal] This Politico story is a fascinating deep dive into Oura cozying up to the government. What caught my eye is a tidbit that Oura is lobbying lawmakers for a “digital health screener” device classification process that would sidestep the more intensive FDA clearance process for medical devices. [Politico] A passionate group of women rediscovered fitness in VR. They’re furious with Mark Zuckerberg for killing their community. Good news, I’ll be on starting at 11AM PT / 2PM ET to answer them in a subscriber-exclusive AMA. Comment your questions in the post below. If you don’t have questions, come hang anyway. Tell me about your latest tech-related existential crisis or what you’d like me to cover in 2026. It’ll be a blast. I wear lots of technology for a living, ask me anything Mirumi is adorable. But living with it reminded me of the limits to the companionship a social robot can provide. That’s according to Seong Cho, head of marketing for mobile, during today’s quarterly earnings call. Discussing plans for 2026, he mentioned XR form factors including “next-generation AR glasses.” Samsung has been developing the glasses with Google as a follow-up to Galaxy XR, but this is the first we’ve heard of a release window. Tennis’s biggest stars keep being asked to take their Whoop trackers off at the Australian Open. The wearable is permitted by the sport’s governing bodies, but banned by the tournament, prompting frustration from player (and, um, paid Whoop ambassador) Aryna Sabalenka: “All the tournaments I play, we wear Whoop. It’s just for tracking my health. I don’t understand why Grand Slams are not allowing us to wear it.” [The Athletic] Patent infringement lawsuits are heating up in the world of smart glasses, with Xreal suing Viture earlier this month and Meta being sued last year over the electromyography tech in the Neural Band used to control the Meta Ray-Ban Display. [Bloomberg] The search for the contents of my mystery “GLP-3” vial leads further into the wellness wild west. ”In the United States, the new moto watch in PANTONE Volcanic Ash will be available for pre-order at motorola.com on January 22 (MSRP: $149.99),” Motorola spokesperson Brendan Hall tells The Verge. “The device will officially go on-sale on January 28.” The watch was announced during CES. At the time, Motorola didn’t share the price. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Motorola’s latest smartwatch promises 13-day battery life and Polar-powered health tracking When I wrote about Nike’s “neuroscience-based” Mind 001 and 002 shoes, I thought they looked uncomfortable. The 22 nodes in each shoe are meant to stimulate your foot’s pressure points and relax your mind, and those nodes “hurt,” according to shoe reviewer Chris Chase at WearTesters. They might be a particularly bad match for Chase, who has arthritis in the balls of his feet. Still, the discomfort and general gimmicky vibe is a pass from Chase (and me). Smart lights that know where they’re placed in a room, wild designs for next-gen routers, and a glowing inedible donut. Rollable laptops, twice-folding phones, and a ‘longevity station.’ This is the CES tech we come back for. Pagination Most Popular The Verge Daily A free daily digest of the news that matters most. This is the title for the native ad © 2026 Vox Media, LLC. All Rights Reserved |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/International_Federation_for_the_Promotion_of_Mechanism_and_Machine_Science] | [TOKENS: 701] |
Contents International Federation for the Promotion of Mechanism and Machine Science International Federation for the Promotion of Mechanism and Machine Science (IFToMM) is an organization that supports international exchange of researchers and engineers from the wide range of discipline related to Mechanical Engineering. Mission To promote research and development in the field of Machines and Mechanisms by theoretical and experimental methods, along with their practical application. History It was on September 29, 1969 at the Second World Congress on Theory of Mechanisms and Machines which took place in Zakopane (Poland), that two scientists, Ivan Artobolevski (USSR) and Erskine Crossley (USA), proposed to establish an International Federation of scientists and engineers to facilitate worldwide collaboration. Representatives of 13 countries signed the foundation act and the International Federation for the Theory of Machines (IFToMM) came into existence. The initial Member Organizations were represented by: Given the expansion of the topics within the IFToMM umbrella, in 1999, the Executive Council decided to recognize the changing role of the organization in international collaboration and approved a new name: "The International Federation for the Promotion of Mechanism and Machine Science". However, the Executive Council considered that the abbreviation IFToMM was already widely used, and therefore suggested to keep it (along with the logo) as a short version of the organization's name. IFToMM officers are the Chairs of IFToMM Member Organizations, the Chairs of Permanent Commissions and Technical Committees, as well as the members of the Executive Council. A complete historical list of IFToMM officers was published in the Proceedings of the Second International Symposium on History of Machines and Mechanisms HMM2004. The Presidents were: The Secretaries General were: Meetings List of all IFToMM World congresses: Notes Members Membership in IFToMM is not individual. Instead, it is by Member Organization (MO) which are akin to national or territorial organizations. A full list of Member Organizations available on the IFToMM web site. Each MO has its own individual or group membership rules. As of the 2015 General Assembly held in Taipei (Taiwan), IFToMM had 47 MOs. In 2018, the membership went down to 45 MOs. Organizational structure The organizational structure of IFToMM includes following bodies The General Assembly is the supreme body of the Federation that determines policy. It is composed of the Chief Delegates of IFToMM Members and members of the Executive Council. The Executive Council is responsible for managing the affairs of the Federation between the sessions of the General Assembly. The Executive Council includes the President, Vice-President, Secretary-General, Treasurer, and six ordinary members. There are four Permanent Commissions (PCs) and 14 Technical Committees (TCs) established under IFToMM supervision. Each Permanent Commission and Technical Committee is composed of a Chairperson, appointed by the Executive Council, and a Secretary and members, nominated by the Chairperson and appointed by the Executive Council. The general goals for the work of the Commissions and Committees are aimed at promoting their fields of interest by attracting researchers and practitioners, including young individuals. The four PCs are: While the 14 TCs are: See also References External links The new official website https://iftomm-world.org/ replaced the old legacy website http://www.iftomm.net/ in early 2021. The legacy website is kept online for now to insure information availability. |
======================================== |
[SOURCE: https://huggingface.co/datasets/Raziel1234/WebBooks#overview] | [TOKENS: 90] |
Datasets: Raziel1234 / WebBooks like 0 Books Corpus Dataset Overview This dataset is a large collection of text lines extracted from free books available on Project Gutenberg. The dataset is primarily composed of literary texts, including classical literature and science fiction. It is designed for training custom language models focused on book-style text generation. Dataset Structure Each line in the corpus represents a cleaned sentence or paragraph extracted from the HTML of Project Gutenberg books. Features Usage |
======================================== |
[SOURCE: https://huggingface.co/datasets/Raziel1234/WebBooks#dataset-structure] | [TOKENS: 90] |
Datasets: Raziel1234 / WebBooks like 0 Books Corpus Dataset Overview This dataset is a large collection of text lines extracted from free books available on Project Gutenberg. The dataset is primarily composed of literary texts, including classical literature and science fiction. It is designed for training custom language models focused on book-style text generation. Dataset Structure Each line in the corpus represents a cleaned sentence or paragraph extracted from the HTML of Project Gutenberg books. Features Usage |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Association_for_Civil_Rights_in_Israel] | [TOKENS: 1130] |
Contents Association for Civil Rights in Israel The Association for Civil Rights in Israel (ACRI) (Hebrew: האגודה לזכויות האזרח בישראל, romanized: HaAgudah LeZkhut HaEzrakh BeYisrael; Arabic: جمعية حقوق المواطن في اسرائيل, romanized: Jamʻīyat Ḥuqūq al-Muwāṭin fī Isrāʼīl) was created in 1972 as an independent, non-partisan not-for-profit organization with the mission of protecting human rights and civil rights in Israel and the territories under its control. ACRI is Israel's oldest and largest human rights organization. Headquartered in Tel Aviv, with offices in Jerusalem, and Nazareth, the organization promotes transparency and accountability in government. ACRI has been accused by critics, including former Prime Minister Yitzhak Rabin, of defending terrorists. History Established in 1972, ACRI views itself as being "committed to promoting the universality of human rights and defending the human rights and civil liberties of all, regardless of religion, nationality, gender, ethnicity, political affiliation, sexual orientation, or socioeconomic background." The association established its views based on the basic rights recognized in the Universal Declaration of Human Rights, adopted by the United Nations General Assembly in 1948, and the values in Declaration of the Establishment of the State of Israel.[citation needed] In 1981, ACRI instituted a human rights award to be given to "individuals and organizations that have made an outstanding contribution to the advancement of human rights in Israel". The award was renamed in 1983 as the "Emil Grunzweig Human Rights Award." In 2009, ACRI organized what has become an annual "Human Rights March" to mark International Human Rights Day (December 10) in Tel Aviv. Activity ACRI's Legal Department argues cases before the Supreme Court of Israel, and also seeks redress before district and labor courts, government ministries, and Knesset committees. ACRI's Education Department conducts human rights training programs, produces educational curricula in Hebrew and Arabic, and organizes conferences and lectures on human rights education. Additionally, ACRI operates a program on International Humanitarian Law (IHL) and offers IHL educational workshops to social activists, students, educators, youth movement counselors, and students at pre-military academies to "enhance the participants’ knowledge of IHL, and to provide opportunities for discussion and for developing their positions on the issues involved." ACRI publishes reports and information leaflets; organizes lectures, conferences, film screenings and other public and community events covering a wide range of human rights issues; and runs a public hotline to assist people whose rights have been infringed. Internationally, ACRI submits shadow reports and provides information to UN committees and representatives regarding Israel’s compliance with its human rights obligations; meets with foreign diplomats and government representatives; participates in international conferences and NGO networks; and raises awareness of human rights issues by generating ongoing international media coverage. ACRI focus on issues pertaining to Arab Minority Rights, Anti-Democratic Initiatives, Freedom of Expression, LGBT Rights, East Jerusalem, Human Rights Defenders in the Occupied Palestinian Territories (OPT), Migrant Workers, Child Rights, Negev Bedouins, Refugees and Asylum Seekers, Right to Health, Women's Rights, and the Right to Housing. ACRI deals also with freedom of expression and the right to demonstrate. The association has initiated many legal actions to establish the right to demonstrate and the rights of demonstrators. Criticism Though ACRI does not identify itself politically, activities of the association has been criticized as assisting organizations that harm Israel's national security. Such criticism was made by prime-minister Yitzhak Rabin over an appeal about exiling 400 Hamas activists to Lebanon in 1992. Rabin Called ACRI - "Association for Rights of Hamas". On the other side of the political spectrum, right-wing activists have called it "Association for Palestinian Civil Rights". In November 2017, Education Minister Naftali Bennett cancelled a conference to be held in cooperation with ACRI following a letter sent by a group of bereaved families accusing ACRI of defending terrorists. ACRI denied the allegations and stated that it does not defend terrorists during their criminal proceedings, rather only in regards to their rights in prison and matters of citizenship and residency. The Emil Grunzweig human rights award The Emil Grunzweig Human Rights Award is awarded annually by Association for Civil Rights in Israel to "individuals and organizations that have made an outstanding contribution to the advancement of human rights in Israel". The award was established in 1981 as an initiative by Professor Jacob Lorch, but was renamed in 1983 after the murder of activist Emil Grunzweig by a grenade thrown by a right-wing Israeli extremist during a Peace Now demonstration against the war in Lebanon. Recipients of the award have included: Funding As well as donations from individuals, foundations and other institutions. International network ACRI is a member of the International Network of Civil Liberties Organizations (INCLO), a network of 13 independent human rights organizations around the world with the aim of advancing human liberty in their respective countries. The American Civil Liberties Union (ACLU) is among the oldest of the 13. Representative publications See also References External links |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Internet#cite_ref-76] | [TOKENS: 9291] |
Contents Internet The Internet (or internet)[a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP)[b] to communicate between networks and devices. It is a network of networks that comprises private, public, academic, business, and government networks of local to global scope, linked by electronic, wireless, and optical networking technologies. The Internet carries a vast range of information services and resources, such as the interlinked hypertext documents and applications of the World Wide Web (WWW), electronic mail, discussion groups, internet telephony, streaming media and file sharing. Most traditional communication media, including telephone, radio, television, paper mail, newspapers, and print publishing, have been transformed by the Internet, giving rise to new media such as email, online music, digital newspapers, news aggregators, and audio and video streaming websites. The Internet has enabled and accelerated new forms of personal interaction through instant messaging, Internet forums, and social networking services. Online shopping has also grown to occupy a significant market across industries, enabling firms to extend brick and mortar presences to serve larger markets. Business-to-business and financial services on the Internet affect supply chains across entire industries. The origins of the Internet date back to research that enabled the time-sharing of computer resources, the development of packet switching, and the design of computer networks for data communication. The set of communication protocols to enable internetworking on the Internet arose from research and development commissioned in the 1970s by the Defense Advanced Research Projects Agency (DARPA) of the United States Department of Defense in collaboration with universities and researchers across the United States and in the United Kingdom and France. The Internet has no single centralized governance in either technological implementation or policies for access and usage. Each constituent network sets its own policies. The overarching definitions of the two principal name spaces on the Internet, the Internet Protocol address (IP address) space and the Domain Name System (DNS), are directed by a maintainer organization, the Internet Corporation for Assigned Names and Numbers (ICANN). The technical underpinning and standardization of the core protocols is an activity of the non-profit Internet Engineering Task Force (IETF). Terminology The word internetted was used as early as 1849, meaning interconnected or interwoven. The word Internet was used in 1945 by the United States War Department in a radio operator's manual, and in 1974 as the shorthand form of Internetwork. Today, the term Internet most commonly refers to the global system of interconnected computer networks, though it may also refer to any group of smaller networks. The word Internet may be capitalized as a proper noun, although this is becoming less common. This reflects the tendency in English to capitalize new terms and move them to lowercase as they become familiar. The word is sometimes still capitalized to distinguish the global internet from smaller networks, though many publications, including the AP Stylebook since 2016, recommend the lowercase form in every case. In 2016, the Oxford English Dictionary found that, based on a study of around 2.5 billion printed and online sources, "Internet" was capitalized in 54% of cases. The terms Internet and World Wide Web are often used interchangeably; it is common to speak of "going on the Internet" when using a web browser to view web pages. However, the World Wide Web, or the Web, is only one of a large number of Internet services. It is the global collection of web pages, documents and other web resources linked by hyperlinks and URLs. History In the 1960s, computer scientists began developing systems for time-sharing of computer resources. J. C. R. Licklider proposed the idea of a universal network while working at Bolt Beranek & Newman and, later, leading the Information Processing Techniques Office at the Advanced Research Projects Agency (ARPA) of the United States Department of Defense. Research into packet switching,[c] one of the fundamental Internet technologies, started in the work of Paul Baran at RAND in the early 1960s and, independently, Donald Davies at the United Kingdom's National Physical Laboratory in 1965. After the Symposium on Operating Systems Principles in 1967, packet switching from the proposed NPL network was incorporated into the design of the ARPANET, an experimental resource sharing network proposed by ARPA. ARPANET development began with two network nodes which were interconnected between the University of California, Los Angeles and the Stanford Research Institute on 29 October 1969. The third site was at the University of California, Santa Barbara, followed by the University of Utah. By the end of 1971, 15 sites were connected to the young ARPANET. Thereafter, the ARPANET gradually developed into a decentralized communications network, connecting remote centers and military bases in the United States. Other user networks and research networks, such as the Merit Network and CYCLADES, were developed in the late 1960s and early 1970s. Early international collaborations for the ARPANET were rare. Connections were made in 1973 to Norway (NORSAR and, later, NDRE) and to Peter Kirstein's research group at University College London, which provided a gateway to British academic networks, the first internetwork for resource sharing. ARPA projects, the International Network Working Group and commercial initiatives led to the development of various protocols and standards by which multiple separate networks could become a single network, or a network of networks. In 1974, Vint Cerf at Stanford University and Bob Kahn at DARPA published a proposal for "A Protocol for Packet Network Intercommunication". Cerf and his graduate students used the term internet as a shorthand for internetwork in RFC 675. The Internet Experiment Notes and later RFCs repeated this use. The work of Louis Pouzin and Robert Metcalfe had important influences on the resulting TCP/IP design. National PTTs and commercial providers developed the X.25 standard and deployed it on public data networks. The ARPANET initially served as a backbone for the interconnection of regional academic and military networks in the United States to enable resource sharing. Access to the ARPANET was expanded in 1981 when the National Science Foundation (NSF) funded the Computer Science Network (CSNET). In 1982, the Internet Protocol Suite (TCP/IP) was standardized, which facilitated worldwide proliferation of interconnected networks. TCP/IP network access expanded again in 1986 when the National Science Foundation Network (NSFNet) provided access to supercomputer sites in the United States for researchers, first at speeds of 56 kbit/s and later at 1.5 Mbit/s and 45 Mbit/s. The NSFNet expanded into academic and research organizations in Europe, Australia, New Zealand and Japan in 1988–89. Although other network protocols such as UUCP and PTT public data networks had global reach well before this time, this marked the beginning of the Internet as an intercontinental network. Commercial Internet service providers emerged in 1989 in the United States and Australia. The ARPANET was decommissioned in 1990. The linking of commercial networks and enterprises by the early 1990s, as well as the advent of the World Wide Web, marked the beginning of the transition to the modern Internet. Steady advances in semiconductor technology and optical networking created new economic opportunities for commercial involvement in the expansion of the network in its core and for delivering services to the public. In mid-1989, MCI Mail and Compuserve established connections to the Internet, delivering email and public access products to the half million users of the Internet. Just months later, on 1 January 1990, PSInet launched an alternate Internet backbone for commercial use; one of the networks that added to the core of the commercial Internet of later years. In March 1990, the first high-speed T1 (1.5 Mbit/s) link between the NSFNET and Europe was installed between Cornell University and CERN, allowing much more robust communications than were capable with satellites. Later in 1990, Tim Berners-Lee began writing WorldWideWeb, the first web browser, after two years of lobbying CERN management. By Christmas 1990, Berners-Lee had built all the tools necessary for a working Web: the HyperText Transfer Protocol (HTTP) 0.9, the HyperText Markup Language (HTML), the first Web browser (which was also an HTML editor and could access Usenet newsgroups and FTP files), the first HTTP server software (later known as CERN httpd), the first web server, and the first Web pages that described the project itself. In 1991 the Commercial Internet eXchange was founded, allowing PSInet to communicate with the other commercial networks CERFnet and Alternet. Stanford Federal Credit Union was the first financial institution to offer online Internet banking services to all of its members in October 1994. In 1996, OP Financial Group, also a cooperative bank, became the second online bank in the world and the first in Europe. By 1995, the Internet was fully commercialized in the U.S. when the NSFNet was decommissioned, removing the last restrictions on use of the Internet to carry commercial traffic. As technology advanced and commercial opportunities fueled reciprocal growth, the volume of Internet traffic started experiencing similar characteristics as that of the scaling of MOS transistors, exemplified by Moore's law, doubling every 18 months. This growth, formalized as Edholm's law, was catalyzed by advances in MOS technology, laser light wave systems, and noise performance. Since 1995, the Internet has tremendously impacted culture and commerce, including the rise of near-instant communication by email, instant messaging, telephony (Voice over Internet Protocol or VoIP), two-way interactive video calls, and the World Wide Web. Increasing amounts of data are transmitted at higher and higher speeds over fiber optic networks operating at 1 Gbit/s, 10 Gbit/s, or more. The Internet continues to grow, driven by ever-greater amounts of online information and knowledge, commerce, entertainment and social networking services. During the late 1990s, it was estimated that traffic on the public Internet grew by 100 percent per year, while the mean annual growth in the number of Internet users was thought to be between 20% and 50%. This growth is often attributed to the lack of central administration, which allows organic growth of the network, as well as the non-proprietary nature of the Internet protocols, which encourages vendor interoperability and prevents any one company from exerting too much control over the network. In November 2006, the Internet was included on USA Today's list of the New Seven Wonders. As of 31 March 2011[update], the estimated total number of Internet users was 2.095 billion (30% of world population). It is estimated that in 1993 the Internet carried only 1% of the information flowing through two-way telecommunication. By 2000 this figure had grown to 51%, and by 2007 more than 97% of all telecommunicated information was carried over the Internet. Modern smartphones can access the Internet through cellular carrier networks, and internet usage by mobile and tablet devices exceeded desktop worldwide for the first time in October 2016. As of 2018[update], 80% of the world's population were covered by a 4G network. The International Telecommunication Union (ITU) estimated that, by the end of 2017, 48% of individual users regularly connect to the Internet, up from 34% in 2012. Mobile Internet connectivity has played an important role in expanding access in recent years, especially in Asia and the Pacific and in Africa. The number of unique mobile cellular subscriptions increased from 3.9 billion in 2012 to 4.8 billion in 2016, two-thirds of the world's population, with more than half of subscriptions located in Asia and the Pacific. The limits that users face on accessing information via mobile applications coincide with a broader process of fragmentation of the Internet. Fragmentation restricts access to media content and tends to affect the poorest users the most. One solution, zero-rating, is the practice of Internet service providers allowing users free connectivity to access specific content or applications without cost. Social impact The Internet has enabled new forms of social interaction, activities, and social associations, giving rise to the scholarly study of the sociology of the Internet. Between 2000 and 2009, the number of Internet users globally rose from 390 million to 1.9 billion. By 2010, 22% of the world's population had access to computers with 1 billion Google searches every day, 300 million Internet users reading blogs, and 2 billion videos viewed daily on YouTube. In 2014 the world's Internet users surpassed 3 billion or 44 percent of world population, but two-thirds came from the richest countries, with 78 percent of Europeans using the Internet, followed by 57 percent of the Americas. However, by 2018, Asia alone accounted for 51% of all Internet users, with 2.2 billion out of the 4.3 billion Internet users in the world. China's Internet users surpassed a major milestone in 2018, when the country's Internet regulatory authority, China Internet Network Information Centre, announced that China had 802 million users. China was followed by India, with some 700 million users, with the United States third with 275 million users. However, in terms of penetration, in 2022, China had a 70% penetration rate compared to India's 60% and the United States's 90%. In 2022, 54% of the world's Internet users were based in Asia, 14% in Europe, 7% in North America, 10% in Latin America and the Caribbean, 11% in Africa, 4% in the Middle East and 1% in Oceania. In 2019, Kuwait, Qatar, the Falkland Islands, Bermuda and Iceland had the highest Internet penetration by the number of users, with 93% or more of the population with access. As of 2022, it was estimated that 5.4 billion people use the Internet, more than two-thirds of the world's population. Early computer systems were limited to the characters in the American Standard Code for Information Interchange (ASCII), a subset of the Latin alphabet. After English (27%), the most requested languages on the World Wide Web are Chinese (25%), Spanish (8%), Japanese (5%), Portuguese and German (4% each), Arabic, French and Russian (3% each), and Korean (2%). Modern character encoding standards, such as Unicode, allow for development and communication in the world's widely used languages. However, some glitches such as mojibake (incorrect display of some languages' characters) still remain. Several neologisms exist that refer to Internet users: Netizen (as in "citizen of the net") refers to those actively involved in improving online communities, the Internet in general or surrounding political affairs and rights such as free speech, Internaut refers to operators or technically highly capable users of the Internet, digital citizen refers to a person using the Internet in order to engage in society, politics, and government participation. The Internet allows greater flexibility in working hours and location, especially with the spread of unmetered high-speed connections. The Internet can be accessed almost anywhere by numerous means, including through mobile Internet devices. Mobile phones, datacards, handheld game consoles and cellular routers allow users to connect to the Internet wirelessly.[citation needed] Educational material at all levels from pre-school (e.g. CBeebies) to post-doctoral (e.g. scholarly literature through Google Scholar) is available on websites. The internet has facilitated the development of virtual universities and distance education, enabling both formal and informal education. The Internet allows researchers to conduct research remotely via virtual laboratories, with profound changes in reach and generalizability of findings as well as in communication between scientists and in the publication of results. By the late 2010s the Internet had been described as "the main source of scientific information "for the majority of the global North population".: 111 Wikis have also been used in the academic community for sharing and dissemination of information across institutional and international boundaries. In those settings, they have been found useful for collaboration on grant writing, strategic planning, departmental documentation, and committee work. The United States Patent and Trademark Office uses a wiki to allow the public to collaborate on finding prior art relevant to examination of pending patent applications. Queens, New York has used a wiki to allow citizens to collaborate on the design and planning of a local park. The English Wikipedia has the largest user base among wikis on the World Wide Web and ranks in the top 10 among all sites in terms of traffic. The Internet has been a major outlet for leisure activity since its inception, with entertaining social experiments such as MUDs and MOOs being conducted on university servers, and humor-related Usenet groups receiving much traffic. Many Internet forums have sections devoted to games and funny videos. Another area of leisure activity on the Internet is multiplayer gaming. This form of recreation creates communities, where people of all ages and origins enjoy the fast-paced world of multiplayer games. These range from MMORPG to first-person shooters, from role-playing video games to online gambling. While online gaming has been around since the 1970s, modern modes of online gaming began with subscription services such as GameSpy and MPlayer. Streaming media is the real-time delivery of digital media for immediate consumption or enjoyment by end users. Streaming companies (such as Netflix, Disney+, Amazon's Prime Video, Mubi, Hulu, and Apple TV+) now dominate the entertainment industry, eclipsing traditional broadcasters. Audio streamers such as Spotify and Apple Music also have significant market share in the audio entertainment market. Video sharing websites are also a major factor in the entertainment ecosystem. YouTube was founded on 15 February 2005 and is now the leading website for free streaming video with more than two billion users. It uses a web player to stream and show video files. YouTube users watch hundreds of millions, and upload hundreds of thousands, of videos daily. Other video sharing websites include Vimeo, Instagram and TikTok.[citation needed] Although many governments have attempted to restrict both Internet pornography and online gambling, this has generally failed to stop their widespread popularity. A number of advertising-funded ostensible video sharing websites known as "tube sites" have been created to host shared pornographic video content. Due to laws requiring the documentation of the origin of pornography, these websites now largely operate in conjunction with pornographic movie studios and their own independent creator networks, acting as de-facto video streaming services. Major players in this field include the market leader Aylo, the operator of PornHub and numerous other branded sites, as well as other independent operators such as xHamster and Xvideos. As of 2023[update], Internet traffic to pornographic video sites rivalled that of mainstream video streaming and sharing services. Remote work is facilitated by tools such as groupware, virtual private networks, conference calling, videotelephony, and VoIP so that work may be performed from any location, such as the worker's home.[citation needed] The spread of low-cost Internet access in developing countries has opened up new possibilities for peer-to-peer charities, which allow individuals to contribute small amounts to charitable projects for other individuals. Websites, such as DonorsChoose and GlobalGiving, allow small-scale donors to direct funds to individual projects of their choice. A popular twist on Internet-based philanthropy is the use of peer-to-peer lending for charitable purposes. Kiva pioneered this concept in 2005, offering the first web-based service to publish individual loan profiles for funding. The low cost and nearly instantaneous sharing of ideas, knowledge, and skills have made collaborative work dramatically easier, with the help of collaborative software, which allow groups to easily form, cheaply communicate, and share ideas. An example of collaborative software is the free software movement, which has produced, among other things, Linux, Mozilla Firefox, and OpenOffice.org (later forked into LibreOffice).[citation needed] Content management systems allow collaborating teams to work on shared sets of documents simultaneously without accidentally destroying each other's work.[citation needed] The internet also allows for cloud computing, virtual private networks, remote desktops, and remote work.[citation needed] The online disinhibition effect describes the tendency of many individuals to behave more stridently or offensively online than they would in person. A significant number of feminist women have been the target of various forms of harassment, including insults and hate speech, to, in extreme cases, rape and death threats, in response to posts they have made on social media. Social media companies have been criticized in the past for not doing enough to aid victims of online abuse. Children also face dangers online such as cyberbullying and approaches by sexual predators, who sometimes pose as children themselves. Due to naivety, they may also post personal information about themselves online, which could put them or their families at risk unless warned not to do so. Many parents choose to enable Internet filtering or supervise their children's online activities in an attempt to protect their children from pornography or violent content on the Internet. The most popular social networking services commonly forbid users under the age of 13. However, these policies can be circumvented by registering an account with a false birth date, and a significant number of children aged under 13 join such sites.[citation needed] Social networking services for younger children, which claim to provide better levels of protection for children, also exist. Internet usage has been correlated to users' loneliness. Lonely people tend to use the Internet as an outlet for their feelings and to share their stories with others, such as in the "I am lonely will anyone speak to me" thread.[citation needed] Cyberslacking can become a drain on corporate resources; employees spend a significant amount of time surfing the Web while at work. Internet addiction disorder is excessive computer use that interferes with daily life. Nicholas G. Carr believes that Internet use has other effects on individuals, for instance improving skills of scan-reading and interfering with the deep thinking that leads to true creativity. Electronic business encompasses business processes spanning the entire value chain: purchasing, supply chain management, marketing, sales, customer service, and business relationship. E-commerce seeks to add revenue streams using the Internet to build and enhance relationships with clients and partners. According to International Data Corporation, the size of worldwide e-commerce, when global business-to-business and -consumer transactions are combined, equate to $16 trillion in 2013. A report by Oxford Economics added those two together to estimate the total size of the digital economy at $20.4 trillion, equivalent to roughly 13.8% of global sales. While much has been written of the economic advantages of Internet-enabled commerce, there is also evidence that some aspects of the Internet such as maps and location-aware services may serve to reinforce economic inequality and the digital divide. Electronic commerce may be responsible for consolidation and the decline of mom-and-pop, brick and mortar businesses resulting in increases in income inequality. A 2013 Institute for Local Self-Reliance report states that brick-and-mortar retailers employ 47 people for every $10 million in sales, while Amazon employs only 14. Similarly, the 700-employee room rental start-up Airbnb was valued at $10 billion in 2014, about half as much as Hilton Worldwide, which employs 152,000 people. At that time, Uber employed 1,000 full-time employees and was valued at $18.2 billion, about the same valuation as Avis Rent a Car and The Hertz Corporation combined, which together employed almost 60,000 people. Advertising on popular web pages can be lucrative, and e-commerce. Online advertising is a form of marketing and advertising which uses the Internet to deliver promotional marketing messages to consumers. It includes email marketing, search engine marketing (SEM), social media marketing, many types of display advertising (including web banner advertising), and mobile advertising. In 2011, Internet advertising revenues in the United States surpassed those of cable television and nearly exceeded those of broadcast television.: 19 Many common online advertising practices are controversial and increasingly subject to regulation. The Internet has achieved new relevance as a political tool. The presidential campaign of Howard Dean in 2004 in the United States was notable for its success in soliciting donation via the Internet. Many political groups use the Internet to achieve a new method of organizing for carrying out their mission, having given rise to Internet activism. Social media websites, such as Facebook and Twitter, helped people organize the Arab Spring, by helping activists organize protests, communicate grievances, and disseminate information. Many have understood the Internet as an extension of the Habermasian notion of the public sphere, observing how network communication technologies provide something like a global civic forum. However, incidents of politically motivated Internet censorship have now been recorded in many countries, including western democracies. E-government is the use of technological communications devices, such as the Internet, to provide public services to citizens and other persons in a country or region. E-government offers opportunities for more direct and convenient citizen access to government and for government provision of services directly to citizens. Cybersectarianism is a new organizational form that involves: highly dispersed small groups of practitioners that may remain largely anonymous within the larger social context and operate in relative secrecy, while still linked remotely to a larger network of believers who share a set of practices and texts, and often a common devotion to a particular leader. Overseas supporters provide funding and support; domestic practitioners distribute tracts, participate in acts of resistance, and share information on the internal situation with outsiders. Collectively, members and practitioners of such sects construct viable virtual communities of faith, exchanging personal testimonies and engaging in the collective study via email, online chat rooms, and web-based message boards. In particular, the British government has raised concerns about the prospect of young British Muslims being indoctrinated into Islamic extremism by material on the Internet, being persuaded to join terrorist groups such as the so-called "Islamic State", and then potentially committing acts of terrorism on returning to Britain after fighting in Syria or Iraq.[citation needed] Applications and services The Internet carries many applications and services, most prominently the World Wide Web, including social media, electronic mail, mobile applications, multiplayer online games, Internet telephony, file sharing, and streaming media services. The World Wide Web is a global collection of documents, images, multimedia, applications, and other resources, logically interrelated by hyperlinks and referenced with Uniform Resource Identifiers (URIs), which provide a global system of named references. URIs symbolically identify services, web servers, databases, and the documents and resources that they can provide. HyperText Transfer Protocol (HTTP) is the main access protocol of the World Wide Web. Web services also use HTTP for communication between software systems for information transfer, sharing and exchanging business data and logistics and is one of many languages or protocols that can be used for communication on the Internet. World Wide Web browser software, such as Microsoft Edge, Mozilla Firefox, Opera, Apple's Safari, and Google Chrome, enable users to navigate from one web page to another via the hyperlinks embedded in the documents. These documents may also contain computer data, including graphics, sounds, text, video, multimedia and interactive content. Client-side scripts can include animations, games, office applications and scientific demonstrations. Email is an important communications service available via the Internet. The concept of sending electronic text messages between parties, analogous to mailing letters or memos, predates the creation of the Internet. Internet telephony is a common communications service realized with the Internet. The name of the principal internetworking protocol, the Internet Protocol, lends its name to voice over Internet Protocol (VoIP).[citation needed] VoIP systems now dominate many markets, being as easy and convenient as a traditional telephone, while having substantial cost savings, especially over long distances. File sharing is the practice of transferring large amounts of data in the form of computer files across the Internet, for example via file servers. The load of bulk downloads to many users can be eased by the use of "mirror" servers or peer-to-peer networks. Access to the file may be controlled by user authentication, the transit of the file over the Internet may be obscured by encryption, and money may change hands for access to the file. The price can be paid by the remote charging of funds from, for example, a credit card whose details are also passed—usually fully encrypted—across the Internet. The origin and authenticity of the file received may be checked by a digital signature. Governance The Internet is a global network that comprises many voluntarily interconnected autonomous networks. It operates without a central governing body. The technical underpinning and standardization of the core protocols (IPv4 and IPv6) is an activity of the Internet Engineering Task Force (IETF), a non-profit organization of loosely affiliated international participants that anyone may associate with by contributing technical expertise. While the hardware components in the Internet infrastructure can often be used to support other software systems, it is the design and the standardization process of the software that characterizes the Internet and provides the foundation for its scalability and success. The responsibility for the architectural design of the Internet software systems has been assumed by the IETF. The IETF conducts standard-setting work groups, open to any individual, about the various aspects of Internet architecture. The resulting contributions and standards are published as Request for Comments (RFC) documents on the IETF web site. The principal methods of networking that enable the Internet are contained in specially designated RFCs that constitute the Internet Standards. Other less rigorous documents are simply informative, experimental, or historical, or document the best current practices when implementing Internet technologies. To maintain interoperability, the principal name spaces of the Internet are administered by the Internet Corporation for Assigned Names and Numbers (ICANN). ICANN is governed by an international board of directors drawn from across the Internet technical, business, academic, and other non-commercial communities. The organization coordinates the assignment of unique identifiers for use on the Internet, including domain names, IP addresses, application port numbers in the transport protocols, and many other parameters. Globally unified name spaces are essential for maintaining the global reach of the Internet. This role of ICANN distinguishes it as perhaps the only central coordinating body for the global Internet. The National Telecommunications and Information Administration, an agency of the United States Department of Commerce, had final approval over changes to the DNS root zone until the IANA stewardship transition on 1 October 2016. Regional Internet registries (RIRs) were established for five regions of the world to assign IP address blocks and other Internet parameters to local registries, such as Internet service providers, from a designated pool of addresses set aside for each region:[citation needed] The Internet Society (ISOC) was founded in 1992 with a mission to "assure the open development, evolution and use of the Internet for the benefit of all people throughout the world". Its members include individuals as well as corporations, organizations, governments, and universities. Among other activities ISOC provides an administrative home for a number of less formally organized groups that are involved in developing and managing the Internet, including: the Internet Engineering Task Force (IETF), Internet Architecture Board (IAB), Internet Engineering Steering Group (IESG), Internet Research Task Force (IRTF), and Internet Research Steering Group (IRSG). On 16 November 2005, the United Nations-sponsored World Summit on the Information Society in Tunis established the Internet Governance Forum (IGF) to discuss Internet-related issues.[citation needed] Infrastructure The communications infrastructure of the Internet consists of its hardware components and a system of software layers that control various aspects of the architecture. As with any computer network, the Internet physically consists of routers, media (such as cabling and radio links), repeaters, and modems. However, as an example of internetworking, many of the network nodes are not necessarily Internet equipment per se. Internet packets are carried by other full-fledged networking protocols, with the Internet acting as a homogeneous networking standard, running across heterogeneous hardware, with the packets guided to their destinations by IP routers.[citation needed] Internet service providers (ISPs) establish worldwide connectivity between individual networks at various levels of scope. At the top of the routing hierarchy are the tier 1 networks, large telecommunication companies that exchange traffic directly with each other via very high speed fiber-optic cables and governed by peering agreements. Tier 2 and lower-level networks buy Internet transit from other providers to reach at least some parties on the global Internet, though they may also engage in peering. End-users who only access the Internet when needed to perform a function or obtain information, represent the bottom of the routing hierarchy.[citation needed] An ISP may use a single upstream provider for connectivity, or implement multihoming to achieve redundancy and load balancing. Internet exchange points are major traffic exchanges with physical connections to multiple ISPs. Large organizations, such as academic institutions, large enterprises, and governments, may perform the same function as ISPs, engaging in peering and purchasing transit on behalf of their internal networks. Research networks tend to interconnect with large subnetworks such as GEANT, GLORIAD, Internet2, and the UK's national research and education network, JANET.[citation needed] Common methods of Internet access by users include broadband over coaxial cable, fiber optics or copper wires, Wi-Fi, satellite, and cellular telephone technology.[citation needed] Grassroots efforts have led to wireless community networks. Commercial Wi-Fi services that cover large areas are available in many cities, such as New York, London, Vienna, Toronto, San Francisco, Philadelphia, Chicago and Pittsburgh. Most servers that provide internet services are today hosted in data centers, and content is often accessed through high-performance content delivery networks. Colocation centers often host private peering connections between their customers, internet transit providers, cloud providers, meet-me rooms for connecting customers together, Internet exchange points, and landing points and terminal equipment for fiber optic submarine communication cables, connecting the internet. Internet Protocol Suite The Internet standards describe a framework known as the Internet protocol suite (also called TCP/IP, based on the first two components.) This is a suite of protocols that are ordered into a set of four conceptional layers by the scope of their operation, originally documented in RFC 1122 and RFC 1123:[citation needed] The most prominent component of the Internet model is the Internet Protocol. IP enables internetworking, essentially establishing the Internet itself. Two versions of the Internet Protocol exist, IPv4 and IPv6.[citation needed] Aside from the complex array of physical connections that make up its infrastructure, the Internet is facilitated by bi- or multi-lateral commercial contracts (e.g., peering agreements), and by technical specifications or protocols that describe the exchange of data over the network.[citation needed] For locating individual computers on the network, the Internet provides IP addresses. IP addresses are used by the Internet infrastructure to direct internet packets to their destinations. They consist of fixed-length numbers, which are found within the packet. IP addresses are generally assigned to equipment either automatically via Dynamic Host Configuration Protocol, or are configured.[citation needed] Domain Name Systems convert user-inputted domain names (e.g. "en.wikipedia.org") into IP addresses.[citation needed] Internet Protocol version 4 (IPv4) defines an IP address as a 32-bit number. IPv4 is the initial version used on the first generation of the Internet and is still in dominant use. It was designed in 1981 to address up to ≈4.3 billion (109) hosts. However, the explosive growth of the Internet has led to IPv4 address exhaustion, which entered its final stage in 2011, when the global IPv4 address allocation pool was exhausted. Because of the growth of the Internet and the depletion of available IPv4 addresses, a new version of IP IPv6, was developed in the mid-1990s, which provides vastly larger addressing capabilities and more efficient routing of Internet traffic. IPv6 uses 128 bits for the IP address and was standardized in 1998. IPv6 deployment has been ongoing since the mid-2000s and is currently in growing deployment around the world, since Internet address registries began to urge all resource managers to plan rapid adoption and conversion. By design, IPv6 is not directly interoperable with IPv4. Instead, it establishes a parallel version of the Internet not directly accessible with IPv4 software. Thus, translation facilities exist for internetworking, and some nodes have duplicate networking software for both networks. Essentially all modern computer operating systems support both versions of the Internet Protocol.[citation needed] Network infrastructure, however, has been lagging in this development.[citation needed] A subnet or subnetwork is a logical subdivision of an IP network.: 1, 16 Computers that belong to a subnet are addressed with an identical most-significant bit-group in their IP addresses. This results in the logical division of an IP address into two fields, the network number or routing prefix and the rest field or host identifier. The rest field is an identifier for a specific host or network interface.[citation needed] The routing prefix may be expressed in Classless Inter-Domain Routing (CIDR) notation written as the first address of a network, followed by a slash character (/), and ending with the bit-length of the prefix. For example, 198.51.100.0/24 is the prefix of the Internet Protocol version 4 network starting at the given address, having 24 bits allocated for the network prefix, and the remaining 8 bits reserved for host addressing. Addresses in the range 198.51.100.0 to 198.51.100.255 belong to this network. The IPv6 address specification 2001:db8::/32 is a large address block with 296 addresses, having a 32-bit routing prefix.[citation needed] For IPv4, a network may also be characterized by its subnet mask or netmask, which is the bitmask that when applied by a bitwise AND operation to any IP address in the network, yields the routing prefix. Subnet masks are also expressed in dot-decimal notation like an address. For example, 255.255.255.0 is the subnet mask for the prefix 198.51.100.0/24.[citation needed] Computers and routers use routing tables in their operating system to forward IP packets to reach a node on a different subnetwork. Routing tables are maintained by manual configuration or automatically by routing protocols. End-nodes typically use a default route that points toward an ISP providing transit, while ISP routers use the Border Gateway Protocol to establish the most efficient routing across the complex connections of the global Internet.[citation needed] The default gateway is the node that serves as the forwarding host (router) to other networks when no other route specification matches the destination IP address of a packet. Security Internet resources, hardware, and software components are the target of criminal or malicious attempts to gain unauthorized control to cause interruptions, commit fraud, engage in blackmail or access private information. Malware is malicious software used and distributed via the Internet. It includes computer viruses which are copied with the help of humans, computer worms which copy themselves automatically, software for denial of service attacks, ransomware, botnets, and spyware that reports on the activity and typing of users.[citation needed] Usually, these activities constitute cybercrime. Defense theorists have also speculated about the possibilities of hackers using cyber warfare using similar methods on a large scale. Malware poses serious problems to individuals and businesses on the Internet. According to Symantec's 2018 Internet Security Threat Report (ISTR), malware variants number has increased to 669,947,865 in 2017, which is twice as many malware variants as in 2016. Cybercrime, which includes malware attacks as well as other crimes committed by computer, was predicted to cost the world economy US$6 trillion in 2021, and is increasing at a rate of 15% per year. Since 2021, malware has been designed to target computer systems that run critical infrastructure such as the electricity distribution network. Malware can be designed to evade antivirus software detection algorithms. The vast majority of computer surveillance involves the monitoring of data and traffic on the Internet. In the United States for example, under the Communications Assistance For Law Enforcement Act, all phone calls and broadband Internet traffic (emails, web traffic, instant messaging, etc.) are required to be available for unimpeded real-time monitoring by Federal law enforcement agencies. Under the Act, all U.S. telecommunications providers are required to install packet sniffing technology to allow Federal law enforcement and intelligence agencies to intercept all of their customers' broadband Internet and VoIP traffic.[d] The large amount of data gathered from packet capture requires surveillance software that filters and reports relevant information, such as the use of certain words or phrases, the access to certain types of web sites, or communicating via email or chat with certain parties. Agencies, such as the Information Awareness Office, NSA, GCHQ and the FBI, spend billions of dollars per year to develop, purchase, implement, and operate systems for interception and analysis of data. Similar systems are operated by Iranian secret police to identify and suppress dissidents. The required hardware and software were allegedly installed by German Siemens AG and Finnish Nokia. Some governments, such as those of Myanmar, Iran, North Korea, Mainland China, Saudi Arabia and the United Arab Emirates, restrict access to content on the Internet within their territories, especially to political and religious content, with domain name and keyword filters. In Norway, Denmark, Finland, and Sweden, major Internet service providers have voluntarily agreed to restrict access to sites listed by authorities. While this list of forbidden resources is supposed to contain only known child pornography sites, the content of the list is secret. Many countries, including the United States, have enacted laws against the possession or distribution of certain material, such as child pornography, via the Internet but do not mandate filter software. Many free or commercially available software programs, called content-control software are available to users to block offensive specific on individual computers or networks in order to limit access by children to pornographic material or depiction of violence.[citation needed] Performance As the Internet is a heterogeneous network, its physical characteristics, including, for example the data transfer rates of connections, vary widely. It exhibits emergent phenomena that depend on its large-scale organization. PB per monthYear020,00040,00060,00080,000100,000120,000140,000199019952000200520102015Petabytes per monthGlobal Internet Traffic Volume The volume of Internet traffic is difficult to measure because no single point of measurement exists in the multi-tiered, non-hierarchical topology. Traffic data may be estimated from the aggregate volume through the peering points of the Tier 1 network providers, but traffic that stays local in large provider networks may not be accounted for.[citation needed] An Internet blackout or outage can be caused by local signaling interruptions. Disruptions of submarine communications cables may cause blackouts or slowdowns to large areas, such as in the 2008 submarine cable disruption. Less-developed countries are more vulnerable due to the small number of high-capacity links. Land cables are also vulnerable, as in 2011 when a woman digging for scrap metal severed most connectivity for the nation of Armenia. Internet blackouts affecting almost entire countries can be achieved by governments as a form of Internet censorship, as in the blockage of the Internet in Egypt, whereby approximately 93% of networks were without access in 2011 in an attempt to stop mobilization for anti-government protests. Estimates of the Internet's electricity usage have been the subject of controversy, according to a 2014 peer-reviewed research paper that found claims differing by a factor of 20,000 published in the literature during the preceding decade, ranging from 0.0064 kilowatt hours per gigabyte transferred (kWh/GB) to 136 kWh/GB. The researchers attributed these discrepancies mainly to the year of reference (i.e. whether efficiency gains over time had been taken into account) and to whether "end devices such as personal computers and servers are included" in the analysis. In 2011, academic researchers estimated the overall energy used by the Internet to be between 170 and 307 GW, less than two percent of the energy used by humanity. This estimate included the energy needed to build, operate, and periodically replace the estimated 750 million laptops, a billion smart phones and 100 million servers worldwide as well as the energy that routers, cell towers, optical switches, Wi-Fi transmitters and cloud storage devices use when transmitting Internet traffic. According to a non-peer-reviewed study published in 2018 by The Shift Project (a French think tank funded by corporate sponsors), nearly 4% of global CO2 emissions could be attributed to global data transfer and the necessary infrastructure. The study also said that online video streaming alone accounted for 60% of this data transfer and therefore contributed to over 300 million tons of CO2 emission per year, and argued for new "digital sobriety" regulations restricting the use and size of video files. See also Notes References Sources Further reading External links |
======================================== |
[SOURCE: https://www.mako.co.il/home-family-kids/Article-df5ebe37893f281026.htm] | [TOKENS: 92] |
We are sorry... ...but your activity and behavior on this website made us think that you are a bot. Please solve this CAPTCHA in helping us understand your behavior to grant access You reached this page when trying to access https://www.mako.co.il/home-family-kids/Article-df5ebe37893f281026.htm from 79.181.162.231 on February 21 2026, 10:51:50 UTC |
======================================== |
[SOURCE: https://www.theverge.com/buying-guides] | [TOKENS: 481] |
Buying Guides You’ve read all the reviews, but now you’re actually ready to buy something and need to make a decision. The Verge Buying Guides are here for you — these are our go-to recommendations for the ultimate question: which one do I buy? Our picks aren’t necessarily the best in every category, but they are the best choices for most people. We also aim to provide an alternative option if our main selection isn’t the right one for you. Buying Guides are updated as new products are released and tested, so be sure to check back frequently for new information. Whether you want to read in the bath or scribble notes in the margins, there’s an e-reader for just about everyone. The best from Apple, Bose, Samsung, Sony, Beats, Google, and more. Latest In Buying Guides Robot vacuums are great for carpets, but if you live in a place with a lot of hardwood floors, models that can also mop offer a better overall cleaning experience. Not all robot vacuum / mop hybrids are created equal, so we’ve updated our best robot vacuum and mop buying guide with new recommendations. Check ‘em out! The best robot vacuum and mop to buy right now On tear gas, and what it means when the government uses it on civilians. We just updated our buying guide for the best Android phones, and the OnePlus 15 stands out as the choice if battery life is your main concern. Want something more affordable? The Pixel 9A is an excellent budget-friendly option. The best Android phones You’re in luck. I just published a big update to my robot vacuum buying guide following months of testing dozens of new bots. Plus, this week is the best time of year to buy a floor-cleaning machine, as they’re seeing major discounts ahead of Black Friday. (Well, all except my top pick!). The best robot vacuums you can buy Good news. We just overhauled our buying guide ahead of Black Friday. Psst: just get an Apple Watch SE 3. The best Apple Watch to buy Whether wired, wireless, or low profile, here are our picks for the best readily available boards. Pagination Most Popular Verge Deals Sign up for Verge Deals to get deals on products we’ve tested sent to your inbox weekly. This is the title for the native ad © 2026 Vox Media, LLC. All Rights Reserved |
======================================== |
[SOURCE: https://www.theverge.com/gadgets] | [TOKENS: 1316] |
Gadgets Posts from this topic will be added to your daily email digest and your homepage feed. See All Phones Posts from this topic will be added to your daily email digest and your homepage feed. See All Chips Anker’s MagGo Wireless Charging Station is currently on sale for a new low of $39.99 ($50 off) at Woot. The foldable, Qi2-certified charger can deliver up to 15W of power to MagSafe-compatible iPhones, fast-charge an Apple Watch Series 11, and top off a pair of earbuds via a third wireless pad. It also doubles as a StandBy-ready dock, so you can use your phone as an ad hoc widget machine. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. It’s my turn to graciously host one of our Verge subscriber-exclusive AMAs. Join me in the comments here at 11AM PT / 2PM ET, and feel free to get your question(s) in early. Ask me about laptops, laptop reviews, photography or whatever else we can geek-out over together. I review laptops for The Verge, ask me anything In case you haven’t heard, RAMageddon is here. And while the tech industry will survive this apocalypse, it might well be forever changed by it. letechguye: This feels like a watershed moment for the personal computer and consumer tech in general. No matter what happens with AI, it’s clear tech companies no longer value consumers/users at all. Price hikes, subscription models, and “protect the children” will continue until eventually every device is a thin client that requires a call home. But not before being intercepted by Palantir. It’s quite sad. Get the day’s best comment and more in my free newsletter, The Verge Daily. Despite fierce competition from the Kindle and Kobo, Barnes & Noble’s Nook is still around after over 16 years. The latest version, now available for preorder for $149.99, is an Android 15 tablet with an 8.7-inch screen, stereo speakers, a headphone jack, and a 5,100mAh battery good for up to 16.5 hours of use. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. The company had paused production on the TB800 EQ in December because of a tracking issue when the trackball was handled from a certain angle. In an email to The Verge, spokesperson Ken Hagihara confirmed that it isn’t coming back. Bummer. I liked the TB800 and its many scroll wheels. Kensington’s new trackball comes packed with scroll wheels An update to the Rivian mobile app released today introduces a companion app for the Apple Watch. From your wrist you can lock and unlock doors, vent windows, activate the alarm, adjust the cabin temperature using the Apple Watch’s crown dial, and monitor your vehicle’s battery status from your watch face. Costco members can get access to an exclusive Asus Xbox ROG Ally promotion running through February 22nd that knocks $100 off the original $589.99 price and includes four games. The entry-level handheld had a rocky launch late last year, but its software has improved since then. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. First announced at CES 2025 and then launched on Kickstarter last October, Hyper’s HyperSpace TrackPad Pro has been delayed indefinitely. An update on its Kickstarter page blames “overseas supply chain issues” and since a new delivery date isn’t known, the company is offering refunds to backers or credits for its online store plus an extra $50. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Amid reports that Meta is preparing to release a smartwatch later this year, one Verge commenter has already figured out what the social media giant is going to do with all that new data. jeffehobbs: People To Follow Who Have Low 𝑆𝑝𝑂2 Levels Like You >>[show less] Get the day’s best comment and more in my free newsletter, The Verge Daily. According to The New Camera, a customer walked into a DJI Authorized drone store in Malaysia to show off the new baby steadicam. The store in question seems to have taken its own videos off Instagram and TikTok, but New Camera uploaded this copy. There’s a slim chance we could get this one in the US. You can currently grab a double pack featuring remastered versions of both Super Mario Galaxy and Super Mario Galaxy 2 at Amazon and Walmart for $59 ($11 off), which is one of the better prices we’ve seen on the excellent Nintendo Switch ports. Just don’t go in expecting a ton of additional content or newfangled features. Read our review. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. If you’ve even wondered how important that lumen measurement is on projectors… Here’s the monstrous Nebula X1 Pro next to the little Nebula P1. I’ve got both portable projectors with detachable speakers in for testing, but only one is viewable in ambient mid-day light. Look, if you’re going to build a product that sits below a car’s backup camera and squirts it clean every now and then, there’s really only one name you can give it, and it isn’t Lens Lizard. oak: disappointed that they decided against calling it the backup-bidet Get the day’s best comment and more in my free newsletter, The Verge Daily. Govee’s RGBIC Floor Lamp is on sale for just $64.98 ($35 off) at Amazon. The 4.6-foot smart lamp can light up your home with over 16 million colors, syncs with music, and boasts dozens of preset effects. I’ve owned it for more than a year, and despite being a last-gen model, it’s a reliable way to brighten your living space. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Pagination Most Popular The Verge Daily A free daily digest of the news that matters most. This is the title for the native ad © 2026 Vox Media, LLC. All Rights Reserved |
======================================== |
[SOURCE: https://www.theverge.com/good-deals] | [TOKENS: 1131] |
Deals Only the best deals on Verge-approved gadgets get the Verge Deals stamp of approval, so if you’re looking for a deal on your next gadget or gift from major retailers like Amazon, Walmart, Best Buy, Target, and more, this is the place to be. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. It comes with a one-year warranty, although it might have minor cosmetic imperfections. Finally, a tome worthy of Samus and her otherworldly escapades. Latest In Deals Anker’s MagGo Wireless Charging Station is currently on sale for a new low of $39.99 ($50 off) at Woot. The foldable, Qi2-certified charger can deliver up to 15W of power to MagSafe-compatible iPhones, fast-charge an Apple Watch Series 11, and top off a pair of earbuds via a third wireless pad. It also doubles as a StandBy-ready dock, so you can use your phone as an ad hoc widget machine. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Costco members can get access to an exclusive Asus Xbox ROG Ally promotion running through February 22nd that knocks $100 off the original $589.99 price and includes four games. The entry-level handheld had a rocky launch late last year, but its software has improved since then. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. You can currently grab a double pack featuring remastered versions of both Super Mario Galaxy and Super Mario Galaxy 2 at Amazon and Walmart for $59 ($11 off), which is one of the better prices we’ve seen on the excellent Nintendo Switch ports. Just don’t go in expecting a ton of additional content or newfangled features. Read our review. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. The aluminum charging stand is on sale at Amazon for an all-time low of $54.99 — a whopping $95 off its initial list price. Apple’s latest AirPods Max don’t support wireless charging, but Mophie’s clever dock features a small dongle that magnetically aligns with the charging pins to deliver power whenever you drop your headphones in. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Now through February 15, new and returning subscribers can get one year of MasterClass for half off, with plans starting at $60. The platform offers video classes taught by leaders in their fields, from relationship courses led by personal growth experts to lessons in cooking, sports, the arts, business, and more. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. If you’re in the market for a Sonos soundbar, the refurbished Sonos Arc SL is $429, down from its original $679 price. At just $60 more than the current sale price on the second-gen Beam model, you’re getting bigger sound and proper Dolby Atmos here (but no mics for voice control), plus the same one-year warranty that comes with new products. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. The Soundcore Sleep A30 have fallen to $179.99 ($50 off) at Amazon and Best Buy, matching their best price to date. The compact noise-canceling earbuds are great for side sleepers and ideal for masking light to moderate snoring, though we were only able to eke out about 6.5 hours per charge while streaming audio over Bluetooth. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. DJI’s Osmo Mobile 7P Gimbal Stabilizer has hit a new low price of $99 ($20 off) at Amazon and Best Buy. The smartphone accessory makes capturing stabilized selfies and videos easier and includes a built-in tripod and a telescoping arm. It can also automatically follow you, start and stop recording, and lets you adjust framing with a wave of your hand. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. In a trend that we hope continues, the price of the first-gen AirTag Bluetooth tracker has sunk below $20 for the first time at Amazon and Walmart. Originally $29 (what you’ll currently pay for the second-gen model with claims of wider coverage and better accuracy), you can pick one up for $17. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. There’s a great Steam PC game bundle available at Humble for the next two weeks and change. The “Sci-Fi Shooters 2.0” bundle includes the System Shock 2 remaster, the Star Wars: Dark Forces remaster, Doom Eternal, and more fun games for just $20 (a $224 value). Proceeds go to non-profit organizations including One Tree Planted and Cool Effect. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Pagination Most Popular Verge Deals Sign up for Verge Deals to get deals on products we’ve tested sent to your inbox weekly. This is the title for the native ad © 2026 Vox Media, LLC. All Rights Reserved |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Black_hole#cite_note-263] | [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 |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Fast.ai#External_links] | [TOKENS: 302] |
Contents fast.ai fast.ai is a non-profit research group focused on deep learning and artificial intelligence. It was founded in 2016 by Jeremy Howard and Rachel Thomas with the goal of democratizing deep learning. They do this by providing a massive open online course (MOOC) named "Practical Deep Learning for Coders," which has no other prerequisites except for knowledge of the programming language Python. Massive Open Online Course The free MOOC "Practical Deep Learning for Coders" is available as recorded videos, initially taught by Howard and Thomas at the University of San Francisco. In contrast to other online learning platforms such as Coursera or Udemy, a certificate is not granted to those successfully finishing the course online. Only the students following the in-person classes can obtain a certificate from the University of San Francisco. The MOOC consists of two parts, each containing seven lessons. Topics include image classification, stochastic gradient descent, natural language processing (NLP), and various deep learning architectures such as convolutional neural networks (CNNs), recursive neural networks (RNNs) and generative adversarial networks (GANs). Applications and alumni Software In the fall of 2018, fast.ai released v1.0 of their free open-source library for deep learning called fastai (without a period), sitting atop PyTorch. Google Cloud was the first to announce its support. This open-source framework is hosted on GitHub and is licensed under the Apache License, Version 2.0. References External links |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Category:Free_software] | [TOKENS: 211] |
Category:Free software This is a category of articles relating to software that meets The Free Software Definition. That is to say that users can freely use, study, copy, redistribute, modify, and publish modified versions of the software, making it "free software" or "open-source software". In practical terms, this means either software whose source code has been released into the public domain, or software which is distributed with a free software license, including, but not limited to, the list of FSF approved software licenses, and whose source code is available to anyone who receives a copy of the software. Going forward, please add articles to specific sub-categories instead of to this general category. People involved with Free software are not a subcategory of Free software, they are under Free software people, which is related. Subcategories This category has the following 13 subcategories, out of 13 total. Pages in category "Free software" The following 10 pages are in this category, out of 10 total. This list may not reflect recent changes. |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Supreme_Court_of_Israel#High_Court_of_Justice] | [TOKENS: 3792] |
Contents Supreme Court of Israel The Supreme Court of Israel (Hebrew: בֵּית הַמִּשְׁפָּט הָעֶלְיוֹן, romanized: Be(i)t HaMishpat HaElyon, Hebrew acronym Bagatz; Arabic: المحكمة العليا, romanized: al-Maḥkama al-‘Ulyā) is the highest court in Israel. It has ultimate appellate jurisdiction over all other courts, and in some cases original jurisdiction. The Supreme Court consists of 15 judges appointed by the president of Israel, upon nomination by the Judicial Selection Committee. Once appointed, Judges serve until retirement at the age of 70 unless they resign or are removed from office. The Court is situated in Jerusalem's Givat Ram governmental campus, about half a kilometer from Israel's legislature, the Knesset. By the principle of binding precedent (stare decisis), Supreme Court rulings are binding upon every other court, except itself. Over the years, it has ruled on numerous sensitive issues, some of which relate to the Israeli–Palestinian conflict, the rights of Arab citizens, and discrimination between Jewish groups in Israel. When ruling as the High Court of Justice (Hebrew: בֵּית מִשְׁפָּט גָּבוֹהַּ לְצֶדֶק, romanized: Be(i)t Mishpat Gavo'ah LeTzedek, also known as its acronym Bagatz, Hebrew: בג"ץ), the court rules on the legality of decisions of State authorities: government decisions, those of local authorities and other bodies and persons performing public functions under the law, and direct challenges to the constitutionality of laws enacted by the Knesset. The court may review actions by state authorities outside of Israel. Yitzhak Amit is the president of the Supreme Court since 13 February 2025, with Noam Sohlberg as Deputy President since 10 April 2025. The Supreme Court has been a main focus of incumbent justice minister Yariv Levin, with an attempt in 2023 to limit the power of the Supreme Court failing and Levin refusing to meet Amit since 2025 in what has been branded as a constitutional crisis. Judicial appointments Supreme Court justices are appointed by the President of Israel, from names submitted by the Judicial Selection Committee, which is composed of nine members: three Supreme Court Judges (including the President of the Supreme Court), two cabinet ministers (one of them being the Minister of Justice), two Knesset members, and two representatives of the Israel Bar Association. Appointing Supreme Court justices requires a majority of 7 of the 9 committee members, or two less than the number present at the meeting.[citation needed] All candidates for appointment to the Supreme Court must have a minimum of five years of experience as a district court judge or otherwise at least ten years of professional legal experience including a minimum of five years practicing law in Israel. These requirements may be waived for a person recognized as an "eminent jurist", although this special category has only been used once for an appointment. The three organs of state—the legislative, executive, and judicial branches of government—as well as the bar association are represented in the Judges' Nominations Committee. Thus, the shaping of the judicial body, through the manner of judicial appointment, is carried out by all the authorities together. Supreme Court Judges cannot be removed from office except by a decision of the Court of Discipline, consisting of judges appointed by the President of the Supreme Court, or upon a decision of the Judicial Selection Committee—at the proposal of the Minister of Justice or the President of the Supreme Court—with the agreement of seven of its nine members. The following are qualified to be appointed Judge of the Supreme Court: a person who has held office as a judge of a District Court for a period of five years, or a person who is inscribed, or entitled to be inscribed, in the roll of advocates, and has for not less than ten years –continuously or intermittently, and of which five years at least in Israel – been engaged in the profession of an advocate, served in a judicial capacity or other legal function in the service of the State of Israel or other service as designated in regulations in this regard, or has taught law at a university or a higher school of learning as designated in regulations in this regard. An "eminent jurist" can also be appointed to the Supreme Court. At the head of the Supreme Court and at the head of the judicial system as a whole is the President of the Supreme Court, and the Deputy President. A judge serves until reaching 70 years of age, or the judge resigns, dies, is appointed to a position which is disqualifying from continued service as a judge, or is removed from office. Current justices The number of Supreme Court justices is determined by a resolution of the Knesset. Currently, there are 11 justices with 4 vacant places. As of October 2025[update], the Supreme Court justices are: Yitzhak Amit (1958, Israel) Noam Sohlberg (1962, Israel) Daphne Barak-Erez (1965, United States) David Mintz (1959, UK) Yael Willner (1959, Israel) Ofer Grosskopf (1969, Israel) Alex Stein (1957, USSR, now Moldova) (1958, Israel) (1958, Israel) (1961, Israel) (1962, Israel) Keren Azulay and Lior Mishaly Shlomai serve as the Court Magistrate Judges (or "Registrars"). Below is a list of presidents of the Supreme Court. Roles of the Supreme Court As an appellate court, the Supreme Court considers cases on appeal (criminal, civil, and military ) on judgments and other decisions of the District Courts. It also considers appeals on judicial and quasi-judicial decisions of various kinds, such as matters relating to the legality of Knesset elections and disciplinary rulings of the Bar Association. As the High Court of Justice (Hebrew: בֵּית מִשְׁפָּט גָּבוֹהַּ לְצֶדֶק, romanized: Beit Mishpat Gavo'ah LeTzedek, also known as its acronym Bagatz, Hebrew: בג"ץ), the Supreme Court rules on matters within its original jurisdiction, primarily regarding the legality of decisions of State authorities: Government decisions, those of local authorities and other bodies and persons performing public functions under the law, and direct challenges to the constitutionality of laws enacted by the Knesset. The Israeli Defense Forces are also subject to the HCJ's judicial review. The court has broad discretionary authority to rule on matters in which it considers it necessary to grant relief in the interests of justice, and which are not within the jurisdiction of another court or tribunal. The High Court of Justice grants relief through orders such as injunction, mandamus and Habeas Corpus, as well as through declaratory judgments. The Supreme Court can also sit at a “further hearing” on its own judgment. In a matter on which the Supreme Court has ruled, whether as a court of appeals or as the High Court of Justice, with a panel of three or more Judges, it may rule at a further hearing with a panel of a larger number of Judges. A further hearing may be held if the Supreme Court makes a ruling inconsistent with a previous ruling or if the Court deems that the importance, difficulty or novelty of a ruling of the Court justifies such hearing. A special power, unique to the Supreme Court, is the power to order a retrial on a criminal matter in which the defendant has been convicted by a final judgment. A ruling to hold a retrial may be made where the Court finds that evidence provided in the case was based upon lies or was forged; where new facts or evidence are discovered that are likely to alter the decision in the case in favor of the accused; where another has meanwhile been convicted of carrying out the same offense and it appears from the circumstances revealed in the trial of that other person that the original party convicted of the offense did not commit it; or, where there is a real concern for miscarriage of justice in the conviction. In practice, a ruling to hold a retrial is very rarely made. The Court announces its judgments through individually signed opinions setting out the result and underlying reasoning. In general, there is a lead opinion for the majority, but there is no "opinion of the Court" as such. Each participating Judge will either note that she or he concurs in the lead opinion (and possibly another opinion as well) or write a separate concurrence. It is not unusual for most or all of the participating Judges to write separately, even when they agree as to the outcome. The Court's opinions are available in Hebrew on its own website and from Nevo. A relatively small subset has been translated into English. These are available in a searchable online database at Versa. They can also be found on the Court's own site and have been published in hard copy in annual volumes by William S. Hein & Co. as the Israel Law Reports. In addition, the Israel Ministry of Foreign Affairs, in cooperation with the Court, has published three volumes of English translations of selected decisions entitled Judgments of the Israel Supreme Court: Fighting Terrorism within the Law. These are part of the Versa database and also can be found online at the MFA's website. In the 1980s and the 1990s, the Supreme Court established its role as a protector of human rights, intervening to secure freedom of speech and freedom to demonstrate, reduce military censorship, limit the use of certain military methods and promote equality between various sectors of the population, which has led to some criticism of judicial overreach. Composition The Supreme Court, both as an appellate court and the High Court of Justice, is normally constituted of a panel of three Judges. A single Supreme Court Judge may rule on interim orders, temporary orders or petitions for an order nisi, and on appeals on interim rulings of District Courts, or on judgments given by a single District Court judge on appeal, and on a judgment or decision of the Magistrates’ Courts. The Supreme Court sits as a panel of five Judges or more in a rehearing on a matter in which the Supreme Court sat with a panel of three Judges. The Supreme Court may sit as a panel of a larger uneven number of Judges than three in matters that involve fundamental legal questions and constitutional issues of particular importance. In a case on which the President of the Supreme Court sits, the President is the Presiding Judge; in a case on which the Deputy President sits and the President does not sit, the Deputy President is the Presiding Judge; in any other case, the Judge with the greatest length of service is the Presiding Judge. The length of service, for this purpose, is calculated from the date of the appointment of the Judge to the Supreme Court. Public perception According to a 2017 poll by non-profit organization Israel Democracy Institute, the Supreme Court is the only State institution that the majority of both Jewish (57%) and Arab citizens of Israel (54%) have trust in, marking a slight increase from their 2016 poll. The institute's 2017 poll on the statement "[t]he power of judicial review over Knesset legislation should be taken away from the Supreme Court" found that 58% of Israelis disagree, 36% agree, and 6% do not know. Trust in the court dropped in a 2022 poll that showed 41% trust among Jews, and opposition to an "override clause", allowing the Knesset to nulify supreme court decisions with a simple-majority, dropping to 48%. In 2025 a poll from Reichman University's Institute for Liberty & Responsibility revealed that public trust in the Supreme Court is more than twice as high as the public's trust in the government. The poll found that the institution with the highest amount of public trust is the IDF at 65 percent, followed by the Supreme Court at 44%, the government at 17% and the Knesset at 11%. Judicial reform attempts The 2023 Israeli judicial reform is a proposed series of changes to the judicial system and the balance of powers in Israel put forward by the thirty-seventh government of Israel, and spearheaded by Deputy Prime Minister and Minister of Justice Yariv Levin and the Chair of the Knesset's Constitution, Law and Justice Committee, Simcha Rothman. It seeks to curb the judiciary's influence over lawmaking and public policy by limiting the Supreme Court's power to exercise judicial review, granting the government control over judicial appointments and limiting the authority of government legal advisors. If adopted, the reform would grant the Knesset the power to override Supreme Court rulings by a majority of 61 or more votes, diminish the ability of the court to conduct judicial review of legislation and of administrative action, prohibit the court from ruling on the constitutionality of basic laws, and change the makeup of the Judicial Selection Committee so that a majority of its members are appointed by the government. 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 court ruled, by a narrow 8-to-7 majority, that the Knesset law blocking the court's use of the "reasonableness" doctrine was unconstitutional, overturning the law—thus self-validating, reasserting and reinforcing the court's own authority to use the "reasonableness" standard, at its discretion, to review and overturn Knesset-passed laws. At the same time, by a broad 12–3 majority, the court ruled that it had the right to review any Knesset-passed Basic Law, and decide on its constitutional legitimacy, so as to "intervene in those rare and exceptional cases wherein the Knesset exceeds its Constitutive authority." The rulings were seen as a major defeat for Netanyahu and Levin. From 2023 until 2025, Justice Minister Levin had blocked the accession of Amit as permanent president who was nominated based on the long-standing seniority-based convention, arguing he possesses discretion regarding the committee's convening, the identity of the candidates to be presented for a vote, and the timing of such a vote, but was forced to call a vote following a unanimous High Court decision although also seen as a part of the judicial reform attempt. Amit was appointed Chief Justice on 26 January 2025, and sworn in on 13 February 2025 by Israeli president Isaac Herzog with Levin boycotting the inauguration and vowing to refuse to meet Amit. A draft of a new judicial reform was presented on 9 January 2025 as a “compromise” between Levin and Foreign Minister Gideon Sa’ar. According to the proposal, the majority necessary for high court appointments will be five out of nine, instead of seven. However, every High Court appointment will require the agreement of at least one representative from the opposition and one from the government. Appointments to other judicial positions will require the approval of one member of the government, one from the opposition, and one judge. The proposal also included a mechanism to prevent a deadlock in Supreme Court appointments. If a year passes with two vacancies, the government and opposition will each propose three candidates, out of which the other side must choose one. The proposal was passed and will apply as a law beginning with the next Knesset after the elections in 2026. Architecture The building was donated to Israel by the Jewish philanthropist Dorothy de Rothschild. Outside the President's Chamber has displayed the letter Ms. Rothschild wrote to Prime Minister Shimon Peres expressing her intention to donate a new building for the Supreme Court. It was designed by Ram Karmi and Ada Karmi-Melamede and opened in 1992. According to the critic Ran Shechori, the building is a "serious attempt to come to grips with the local building tradition". He writes that, It makes rich and wide-ranging references to the whole lexicon of Eretz-Israel building over the centuries, starting with Herodian structures, through the Hellenistic tomb of Absalom, the Crusaders, Greek Orthodox monasteries, and up to the British Mandate period. This outpouring is organized in a complex, almost baroque structure, built out of contrasts light-shade, narrow-wide, open-closed, stone-plaster, straight-round, and a profusion of existential experiences. Paul Goldberger of The New York Times calls it "Israel's finest public building," achieving "a remarkable and exhilarating balance between the concerns of daily life and the symbolism of the ages." He notes the complexity of the design with its interrelated geometric patterns: There is no clear front door and no simple pattern to the organization. The building cannot be described solely as long, or solely as rounded or as being arranged around a series of courtyards, though from certain angles, like the elephant described by the blind man, it could be thought to be any one of these. The structure, in fact, consists of three main sections: a square library wing within which is set a round courtyard containing a copper-clad pyramid, a rectangular administrative wing containing judges' chambers arrayed around a cloistered courtyard and a wing containing five courtrooms, all of which extend like fingers from a great main hall. The building is a blend of enclosed and open spaces; old and new; lines and circles. Approaching the Supreme Court library, one enters the pyramid area, a large space that serves as a turning point before the entrance to the courtrooms. This serene space acts as the inner "gatehouse" of the Supreme Court building. The Pyramid was inspired by the Tomb of Zechariah and Tomb of Absalom in the Kidron Valley in Jerusalem. Natural light enters round windows at the apex of the pyramid, forming circles of sunlight on the inside walls and on the floor. See also References External links |
======================================== |
[SOURCE: https://www.theverge.com/gift-guides] | [TOKENS: 661] |
Gift Guides No matter how well you know someone, it can still be difficult to find the right tech gift. Why not leave your shopping in the hands of complete strangers? The Verge is comprised of a diverse group of people with passions, tastes, and hobbies that are equally representative of someone you probably know. We like what they like, so whether you’re shopping for a birthday, trying to find the perfect thing for Mother’s or Father’s Day, back to school or graduation, or looking for inspiration for holiday presents, you’ll find something fun, quirky, useful (or all three) in our gift guides. A curated mix of tech-y standouts, everyday favorites, and other delights for everyone on your list. We’ve collected 36 items designed to make student life that much easier (and far more enjoyable). We’ve brought together 36 last-minute gift ideas for your dad, including tech, tools, and ways to unwind. We have several clever gift ideas for anyone needing a modern home makeover in 2025. A collection of fun, affordable, and unique gifts fit for everyone on your list. Some of us freshly anointed moms and dads pooled together our top tech picks that make early days with baby just a touch easier (or more fun and nerdy). From gadgets that’ll take care of the chores to smart coffee machines and cozy throws, here are some of our favorite gadgets and goods that’ll spruce up any home. Our budget-friendly gift guide has it all, from buzzy earbuds and drift-free gamepads to the coolest lightsaber knockoff there is. From smart ovens and calendars to color-changing nail polish, here are some of our favorite gadgets and goods to gift mom this year. Whether you’re assembling a PC, planning an epic Etsy crafts store, or just fixing a squeaky old chair, we found some handy tools that anyone can appreciate. Gifting in this economy? Totally doable. We’ve found scores of great budget-friendly gift ideas that can help you load up for the holidays. The holidays are expensive, but they don’t have to be. From fitness trackers to smart speakers, here are the best gifts under $50. If you’re unsure what to gift the father figure in your life this year, we have more than a few suggestions. We’ve compiled a collection of great gifts for any globetrotter, whether they’re headed to Beijing, Baltimore, or anywhere in between. Equipping a student for school, especially campus life, takes more than some composition books and a few No. 2 pencils. We’ve curated a collection of great gifts that should appease any dad, from tabletop games and tools to some of our favorite tech. We’ve rounded up a collection of gadgets that are sure to make a splash this year, from MacBooks and musical frames to our favorite vlogging camera. We found all sorts of gadgets and goodies to celebrate the class of 2024, from the practical to the poignant. We found a collection of unique gift ideas that go beyond the flowers and chocolates that typically rule the day. Pagination Most Popular The Verge Daily A free daily digest of the news that matters most. This is the title for the native ad © 2026 Vox Media, LLC. All Rights Reserved |
======================================== |
[SOURCE: https://huggingface.co/datasets/Raziel1234/WebBooks#features] | [TOKENS: 90] |
Datasets: Raziel1234 / WebBooks like 0 Books Corpus Dataset Overview This dataset is a large collection of text lines extracted from free books available on Project Gutenberg. The dataset is primarily composed of literary texts, including classical literature and science fiction. It is designed for training custom language models focused on book-style text generation. Dataset Structure Each line in the corpus represents a cleaned sentence or paragraph extracted from the HTML of Project Gutenberg books. Features Usage |
======================================== |
[SOURCE: https://www.wired.com/story/metadata-exposes-authors-of-ices-mega-detention-center-plans/] | [TOKENS: 1987] |
Maddy VarnerSecurityFeb 20, 2026 1:27 PMMetadata Exposes Authors of ICE’s ‘Mega’ Detention Center PlansComments and other data left on a PDF detailing Homeland Security’s proposal to build “mega” detention and processing centers reveal the personnel involved in its creation.The Department of Justice headquarters in Washington, DC on June 9, 2025.Photograph: Bryan Dozier/Getty ImagesSave StorySave this storySave StorySave this storyA PDF that Department of Homeland Security officials provided to New Hampshire governor Kelly Ayotte’s office about a new effort to build “mega” detention and processing centers across the United States contains embedded comments and metadata identifying the people who worked on it.The seemingly accidental exposure of the identities of DHS personnel who crafted Immigration and Customs Enforcement’s mega detention center plan lands amid widespread public pushback against the expansion of ICE detention centers and the department’s brutal immigration enforcement tactics.Metadata in the document, which concerns ICE’s “Detention Reengineering Initiative” (DRI), lists as its author Jonathan Florentino, the director of ICE’s Newark, New Jersey, Field Office of Enforcement and Removal Operations.In a note embedded on top of an FAQ question, “What is the average length of stay for the aliens?” Tim Kaiser, the deputy chief of staff for US Citizenship and Immigration Services, asked David Venturella, a former GEO Group executive whom The Washington Post described as an adviser overseeing an ICE division that manages detention center contracts, to “Please confirm” that the average stay for the new mega detention centers would be 60 days.Venturella replied in a note that remained visible on the published document, “Ideally, I'd like to see a 30-day average for the Mega Center but 60 is fine.”Details of the Kaiser and Venturella's involvement in the document were first flagged by Project Salt Box. DHS did not respond to a request for comment about what the three men’s role in the DRI project is, nor did it answer questions about whether Florentino had access to a PDF processor subscription that might have enabled him to scrub metadata and comments from the PDF before sending it to the New Hampshire governor. (The so-called Department of Government Efficiency spent last year slashing the number of software licenses across the federal government.)The document itself says that ICE intends to update a new detention model by the end of September of this year. ICE says it will create “an efficient detention network by reducing the total number of contracted detention facilities in use while increasing total bed capacity, enhancing custody management, and streamlining removal operations.”“ICE’s surge hiring effort has resulted in the addition of 12,000 new law enforcement officers,” the DHS document says. “For ICE to sustain the anticipated increase in enforcement operations and arrests in 2026, an increase in detention capacity will be a necessary downstream requirement.”Got a Tip?Are you a current or former government employee who wants to talk about US immigration enforcement? We'd like to hear from you. Using a nonwork phone or computer, contact the reporter securely on Signal at mvarner.01.ICE plans on having two types of facilities: regional processing centers that will hold between 1,000 to 1,500 detainees for an average stay of three to seven days, and the mega detention facilities, which will hold an average of 7,000 to 10,000 people for an average of 60 days. It’s been referred to as a “hub and spoke model,” where the smaller facilities will feed into the mega ones.“ICE plans to activate all facilities by November 30, 2026, ensuring the timely expansion of detention capacity,” the document says.Beyond detention centers, ICE plans to buy or lease offices and other facilities in more than 150 locations, in nearly every state in the US, according to documents first reported by WIRED.The errant comment in the PDF sent to New Hampshire’s governor is not the only issue the set of documents apparently had; according to the New Hampshire Bulletin, a previous version of an accompanying document, an economic impact analysis of a processing site in Merrimack, New Hampshire, referenced “the Oklahoma economy” in the opening lines. The errant document remains on the governor’s website, as of publication.Across the country, ICE’s mega detention center projects have sparked controversy. ICE’s purchase of a warehouse in Surprise, Arizona, spurred hundreds to attend a city council meeting on the topic, according to KJZZ in Phoenix. In Social Circle, Georgia, city officials have pushed back against DHS’s proposal to build a mega center there, because officials say the city’s water and sewage treatment infrastructure would not be able to handle the influx of people.Updated 3:37 pm ET, February 20, 2026: Added a link to Project Salt Box, which first reported on metadata showing Kaiser and Venturella worked on the DHS document. Metadata Exposes Authors of ICE’s ‘Mega’ Detention Center Plans A PDF that Department of Homeland Security officials provided to New Hampshire governor Kelly Ayotte’s office about a new effort to build “mega” detention and processing centers across the United States contains embedded comments and metadata identifying the people who worked on it. The seemingly accidental exposure of the identities of DHS personnel who crafted Immigration and Customs Enforcement’s mega detention center plan lands amid widespread public pushback against the expansion of ICE detention centers and the department’s brutal immigration enforcement tactics. Metadata in the document, which concerns ICE’s “Detention Reengineering Initiative” (DRI), lists as its author Jonathan Florentino, the director of ICE’s Newark, New Jersey, Field Office of Enforcement and Removal Operations. In a note embedded on top of an FAQ question, “What is the average length of stay for the aliens?” Tim Kaiser, the deputy chief of staff for US Citizenship and Immigration Services, asked David Venturella, a former GEO Group executive whom The Washington Post described as an adviser overseeing an ICE division that manages detention center contracts, to “Please confirm” that the average stay for the new mega detention centers would be 60 days. Venturella replied in a note that remained visible on the published document, “Ideally, I'd like to see a 30-day average for the Mega Center but 60 is fine.” Details of the Kaiser and Venturella's involvement in the document were first flagged by Project Salt Box. DHS did not respond to a request for comment about what the three men’s role in the DRI project is, nor did it answer questions about whether Florentino had access to a PDF processor subscription that might have enabled him to scrub metadata and comments from the PDF before sending it to the New Hampshire governor. (The so-called Department of Government Efficiency spent last year slashing the number of software licenses across the federal government.) The document itself says that ICE intends to update a new detention model by the end of September of this year. ICE says it will create “an efficient detention network by reducing the total number of contracted detention facilities in use while increasing total bed capacity, enhancing custody management, and streamlining removal operations.” “ICE’s surge hiring effort has resulted in the addition of 12,000 new law enforcement officers,” the DHS document says. “For ICE to sustain the anticipated increase in enforcement operations and arrests in 2026, an increase in detention capacity will be a necessary downstream requirement.” ICE plans on having two types of facilities: regional processing centers that will hold between 1,000 to 1,500 detainees for an average stay of three to seven days, and the mega detention facilities, which will hold an average of 7,000 to 10,000 people for an average of 60 days. It’s been referred to as a “hub and spoke model,” where the smaller facilities will feed into the mega ones. “ICE plans to activate all facilities by November 30, 2026, ensuring the timely expansion of detention capacity,” the document says. Beyond detention centers, ICE plans to buy or lease offices and other facilities in more than 150 locations, in nearly every state in the US, according to documents first reported by WIRED. The errant comment in the PDF sent to New Hampshire’s governor is not the only issue the set of documents apparently had; according to the New Hampshire Bulletin, a previous version of an accompanying document, an economic impact analysis of a processing site in Merrimack, New Hampshire, referenced “the Oklahoma economy” in the opening lines. The errant document remains on the governor’s website, as of publication. Across the country, ICE’s mega detention center projects have sparked controversy. ICE’s purchase of a warehouse in Surprise, Arizona, spurred hundreds to attend a city council meeting on the topic, according to KJZZ in Phoenix. In Social Circle, Georgia, city officials have pushed back against DHS’s proposal to build a mega center there, because officials say the city’s water and sewage treatment infrastructure would not be able to handle the influx of people. Updated 3:37 pm ET, February 20, 2026: Added a link to Project Salt Box, which first reported on metadata showing Kaiser and Venturella worked on the DHS document. You Might Also Like In your inbox: Upgrade your life with WIRED-tested gear A wave of unexplained bot traffic is sweeping the web Big Story: The women training for pregnancy like it’s a marathon Iran’s digital surveillance machine is almost complete Listen: Silicon Valley tech workers are trying to stop ICE © 2026 Condé Nast. All rights reserved. WIRED may earn a portion of sales from products that are purchased through our site as part of our Affiliate Partnerships with retailers. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Condé Nast. Ad Choices |
======================================== |
[SOURCE: https://en.wikipedia.org/wiki/Sabalan,_Safad] | [TOKENS: 778] |
Contents Sabalan, Safad Sabalan (Arabic: سبلان, Sabalân) was a Palestinian Arab village in the Safad Subdistrict, located 15.5 kilometers (9.6 mi) northwest of Safad. It stood at an elevation of 800 meters (2,600 ft) above sea level overlooking the Druze village of Hurfeish (now a Druze town). In 1945, Sabalan had a population of 70. It was depopulated during the 1948 Palestine War. History According to Muhammad Fahour, a former resident of Sabalan, the village was founded during the French campaign in Syria (1798–1801) when Suleiman al-Bahiri, an Egyptian officer from Egyptian, decided to escape to Palestine after Napoleon declared war on Egypt. Following a recurrent dream he had, he decided to settle on Mount Sabalan. In 1881, the PEF's Survey of Western Palestine (SWP) described 'Neby Sebelan' as "a village, built of stone, surrounding the tomb of the Neby Sebalan; containing about 100 Moslems; on top of high hill, with figs, olives, and arable land. There are four good springs to the east, besides cisterns." Some believe Sabalan is supposed to be Zebulun, the son of Jacob, while others claim he was a da'i ("missionary") who joined the Druze religion and helped promote it in the region. Archaeological artifacts, namely rock-cut tombs are located near the tomb. A population list from about 1887 showed 'Nebi Abu Sebalan' to have about 75 inhabitants; all Muslims. In the British Mandate period, it had a circular plan with most of its houses being closely clustered together. Because of the steep slopes that surrounded Sabalan, the village was only able to expand on its northwestern end. Although the tomb of Nabi Sabalan was sacred to the Druze, at the centre of the village stood a mosque. In the 1922 census of Palestine Sabalan had a population of 68; all Muslims, increasing in the 1931 census, to 94 Muslims, living in 18 houses. By 1945 the population was 70 Muslims, and the village consisted of 1,798 dunams of land, according to an official land and population survey. Of this, a total of 421 dunams were used for cereals; 144 dunams were irrigated or used for plantations, while a 14 dunams were built-up (urban) areas. On October 30, 1948, during the Israeli offensive Operation Hiram, Sabalan was captured. Units of Israel's Golani Brigade overran the village with support from the Sheva Brigade as they were advancing along the road leading from Suhmata and Sa'sa'. No Jewish localities were built on village lands, According to Palestinian historian, Walid Khalidi, "Only one village house and a well remain." The remaining house is occupied by the Druze guards and caretakers of the Nabi Sabalan tomb and new buildings were constructed to accommodate pilgrims and visitors. In 1965, Druze youth activists led by the poet Samih al-Qasim protested the confiscation of the lands surrounding the tomb by the Israeli government, which declared them "state lands". The Druze religious leadership established Eid al-Nabi Sabalan (Feast of the Prophet Sabalan) in 1971. Today, the lands of the village, including the holy shrine, were annexed to the Druze town of Hurfeish. A neighborhood for released soldiers was built there. References Bibliography External links |
======================================== |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.