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After the discovery of the first acoustic peak by the balloon-borne BOOMERanG experiment in 2000, the power spectrum was precisely observed by WMAP in 2003–2012, and even more precisely by the "Planck" spacecraft in 2013–2015. The results support the Lambda-CDM model.
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The observed CMB angular power spectrum provides powerful evidence in support of dark matter, as its precise structure is well fitted by the Lambda-CDM model, but difficult to reproduce with any competing model such as modified Newtonian dynamics (MOND).
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Structure formation refers to the period after the Big Bang when density perturbations collapsed to form stars, galaxies, and clusters. Prior to structure formation, the Friedmann solutions to general relativity describe a homogeneous universe. Later, small anisotropies gradually grew and condensed the homogeneous univ...
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Dark matter provides a solution to this problem because it is unaffected by radiation. Therefore, its density perturbations can grow first. The resulting gravitational potential acts as an attractive potential well for ordinary matter collapsing later, speeding up the structure formation process.
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If dark matter does not exist, then the next most likely explanation must be that general relativity – the prevailing theory of gravity – is incorrect and should be modified. The Bullet Cluster, the result of a recent collision of two galaxy clusters, provides a challenge for modified gravity theories because its appar...
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Type Ia supernovae can be used as standard candles to measure extragalactic distances, which can in turn be used to measure how fast the universe has expanded in the past. Data indicates the universe is expanding at an accelerating rate, the cause of which is usually ascribed to dark energy. Since observations indicate...
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Baryon acoustic oscillations (BAO) are fluctuations in the density of the visible baryonic matter (normal matter) of the universe on large scales. These are predicted to arise in the Lambda-CDM model due to acoustic oscillations in the photon–baryon fluid of the early universe, and can be observed in the cosmic microwa...
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Large galaxy redshift surveys may be used to make a three-dimensional map of the galaxy distribution. These maps are slightly distorted because distances are estimated from observed redshifts; the redshift contains a contribution from the galaxy's so-called peculiar velocity in addition to the dominant Hubble expansion...
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In astronomical spectroscopy, the Lyman-alpha forest is the sum of the absorption lines arising from the Lyman-alpha transition of neutral hydrogen in the spectra of distant galaxies and quasars. Lyman-alpha forest observations can also constrain cosmological models. These constraints agree with those obtained from WMA...
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Dark matter can refer to any substance which interacts predominantly via gravity with visible matter (e.g., stars and planets). Hence in principle it need not be composed of a new type of fundamental particle but could, at least in part, be made up of standard baryonic matter, such as protons or neutrons.
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Most of the ordinary matter familiar to astronomers, including planets, brown dwarfs, red dwarfs, visible stars, white dwarfs, neutron stars, and black holes, is called "baryonic matter" (referring to the baryons that dominate the mass of most ordinary matter). Solitary black holes, neutron stars, burnt-out dwarfs, and...
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Candidates for non-baryonic dark matter are hypothetical particles such as axions, sterile neutrinos, weakly interacting massive particles (WIMPs), supersymmetric particles, or geons. The three neutrino types already observed are indeed abundant, and dark, and matter, but because their individual masses – however uncer...
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Unlike baryonic matter, nonbaryonic matter did not contribute to the formation of the elements in the early universe (Big Bang nucleosynthesis) and so its presence is revealed only via its gravitational effects, or weak lensing. In addition, if the particles of which it is composed are supersymmetric, they can undergo ...
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If dark matter is composed of weakly-interacting particles, then an obvious question is whether it can form objects equivalent to planets, stars, or black holes. Historically, the answer has been it cannot, because of two factors:
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In 2015–2017, the idea that dense dark matter was composed of primordial black holes made a comeback following results of gravitational wave measurements which detected the merger of intermediate-mass black holes. Black holes with about 30 solar masses are not predicted to form by either stellar collapse (typically les...
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The possibility that atom-sized primordial black holes account for a significant fraction of dark matter was ruled out by measurements of positron and electron fluxes outside the Sun's heliosphere by the Voyager 1 spacecraft. Tiny black holes are theorized to emit Hawking radiation. However the detected fluxes were too...
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However, there still exists a largely unconstrained mass range smaller than that which can be limited by optical microlensing observations, where primordial black holes may account for all dark matter.
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Dark matter can be divided into "cold", "warm", and "hot" categories. These categories refer to velocity rather than an actual temperature, indicating how far corresponding objects moved due to random motions in the early universe, before they slowed due to cosmic expansion – this is an important distance called the "f...
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The categories are set with respect to the size of a protogalaxy (an object that later evolves into a dwarf galaxy): Dark matter particles are classified as cold, warm, or hot according to their FSL; much smaller (cold), similar to (warm), or much larger (hot) than a protogalaxy. Mixtures of the above are also possible...
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Cold dark matter leads to a bottom-up formation of structure with galaxies forming first and galaxy clusters at a latter stage, while hot dark matter would result in a top-down formation scenario with large matter aggregations forming early, later fragmenting into separate galaxies; the latter is excluded by high-redsh...
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These categories also correspond to fluctuation spectrum effects and the interval following the Big Bang at which each type became non-relativistic. Davis "et al." wrote in 1985:
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Another approximate dividing line is warm dark matter became non-relativistic when the universe was approximately 1 year old and 1 millionth of its present size and in the radiation-dominated era (photons and neutrinos), with a photon temperature 2.7 million Kelvins. Standard physical cosmology gives the particle horiz...
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The 2.7 million K photon temperature gives a typical photon energy of 250 electronvolts, thereby setting a typical mass scale for warm dark matter: particles much more massive than this, such as GeV–TeV mass WIMPs, would become non-relativistic much earlier than one year after the Big Bang and thus have FSLs much small...
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Cold dark matter offers the simplest explanation for most cosmological observations. It is dark matter composed of constituents with an FSL much smaller than a protogalaxy. This is the focus for dark matter research, as hot dark matter does not seem capable of supporting galaxy or galaxy cluster formation, and most par...
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The constituents of cold dark matter are unknown. Possibilities range from large objects like MACHOs (such as black holes and Preon stars) or RAMBOs (such as clusters of brown dwarfs), to new particles such as WIMPs and axions.
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Studies of Big Bang nucleosynthesis and gravitational lensing convinced most cosmologists that MACHOs cannot make up more than a small fraction of dark matter. According to A. Peter: "... the only "really plausible" dark-matter candidates are new particles."
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The 1997 DAMA/NaI experiment and its successor DAMA/LIBRA in 2013, claimed to directly detect dark matter particles passing through the Earth, but many researchers remain skeptical, as negative results from similar experiments seem incompatible with the DAMA results.
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Many supersymmetric models offer dark matter candidates in the form of the WIMPy Lightest Supersymmetric Particle (LSP). Separately, heavy sterile neutrinos exist in non-supersymmetric extensions to the standard model which explain the small neutrino mass through the seesaw mechanism.
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Warm dark matter comprises particles with an FSL comparable to the size of a protogalaxy. Predictions based on warm dark matter are similar to those for cold dark matter on large scales, but with less small-scale density perturbations. This reduces the predicted abundance of dwarf galaxies and may lead to lower density...
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No known particles can be categorized as warm dark matter. A postulated candidate is the sterile neutrino: A heavier, slower form of neutrino that does not interact through the weak force, unlike other neutrinos. Some modified gravity theories, such as scalar–tensor–vector gravity, require "warm" dark matter to make th...
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Hot dark matter consists of particles whose FSL is much larger than the size of a protogalaxy. The neutrino qualifies as such particle. They were discovered independently, long before the hunt for dark matter: they were postulated in 1930, and detected in 1956. Neutrinos' mass is less than 10 that of an electron. Neutr...
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The three known flavours of neutrinos are the "electron", "muon", and "tau". Their masses are slightly different. Neutrinos oscillate among the flavours as they move. It is hard to determine an exact upper bound on the collective average mass of the three neutrinos (or for any of the three individually). For example, i...
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Because galaxy-size density fluctuations get washed out by free-streaming, hot dark matter implies the first objects that can form are huge supercluster-size pancakes, which then fragment into galaxies. Deep-field observations show instead that galaxies formed first, followed by clusters and superclusters as galaxies c...
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If dark matter is made up of subatomic particles, then millions, possibly billions, of such particles must pass through every square centimeter of the Earth each second. Many experiments aim to test this hypothesis. Although WIMPs have been the main search candidates, axions have drawn renewed attention, with the Axion...
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These experiments can be divided into two classes: direct detection experiments, which search for the scattering of dark matter particles off atomic nuclei within a detector; and indirect detection, which look for the products of dark matter particle annihilations or decays.
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Direct detection experiments aim to observe low-energy recoils (typically a few keVs) of nuclei induced by interactions with particles of dark matter, which (in theory) are passing through the Earth. After such a recoil the nucleus will emit energy in the form of scintillation light or phonons, as they pass through sen...
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These experiments mostly use either cryogenic or noble liquid detector technologies. Cryogenic detectors operating at temperatures below 100 mK, detect the heat produced when a particle hits an atom in a crystal absorber such as germanium. Noble liquid detectors detect scintillation produced by a particle collision in ...
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Currently there has been no well-established claim of dark matter detection from a direct detection experiment, leading instead to strong upper limits on the mass and interaction cross section with nucleons of such dark matter particles. The DAMA/NaI and more recent DAMA/LIBRA experimental collaborations have detected ...
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A special case of direct detection experiments covers those with directional sensitivity. This is a search strategy based on the motion of the Solar System around the Galactic Center. A low-pressure time projection chamber makes it possible to access information on recoiling tracks and constrain WIMP-nucleus kinematics...
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Indirect detection experiments search for the products of the self-annihilation or decay of dark matter particles in outer space. For example, in regions of high dark matter density (e.g., the centre of our galaxy) two dark matter particles could annihilate to produce gamma rays or Standard Model particle–antiparticle ...
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A few of the dark matter particles passing through the Sun or Earth may scatter off atoms and lose energy. Thus dark matter may accumulate at the center of these bodies, increasing the chance of collision/annihilation. This could produce a distinctive signal in the form of high-energy neutrinos. Such a signal would be ...
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The detection by LIGO in September 2015 of gravitational waves opens the possibility of observing dark matter in a new way, particularly if it is in the form of primordial black holes.
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Many experimental searches have been undertaken to look for such emission from dark matter annihilation or decay, examples of which follow.
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The Energetic Gamma Ray Experiment Telescope observed more gamma rays in 2008 than expected from the Milky Way, but scientists concluded this was most likely due to incorrect estimation of the telescope's sensitivity.
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The Fermi Gamma-ray Space Telescope is searching for similar gamma rays. In April 2012, an analysis of previously available data from its Large Area Telescope instrument produced statistical evidence of a 130 GeV signal in the gamma radiation coming from the center of the Milky Way. WIMP annihilation was seen as the mo...
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At higher energies, ground-based gamma-ray telescopes have set limits on the annihilation of dark matter in dwarf spheroidal galaxies and in clusters of galaxies.
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The PAMELA experiment (launched in 2006) detected excess positrons. They could be from dark matter annihilation or from pulsars. No excess antiprotons were observed.
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In 2013 results from the Alpha Magnetic Spectrometer on the International Space Station indicated excess high-energy cosmic rays which could be due to dark matter annihilation.
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An alternative approach to the detection of dark matter particles in nature is to produce them in a laboratory. Experiments with the Large Hadron Collider (LHC) may be able to detect dark matter particles produced in collisions of the LHC proton beams. Because a dark matter particle should have negligible interactions ...
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Because dark matter has not yet been identified, many other hypotheses have emerged aiming to explain the same observational phenomena without introducing a new unknown type of matter. The most common method is to modify general relativity. General relativity is well-tested on solar system scales, but its validity on g...
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A problem with alternative hypotheses is that observational evidence for dark matter comes from so many independent approaches (see the "observational evidence" section above). Explaining any individual observation is possible but explaining all of them in the absence of dark matter is very difficult. Nonetheless, ther...
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The prevailing opinion among most astrophysicists is that while modifications to general relativity can conceivably explain part of the observational evidence, there is probably enough data to conclude there must be some form of dark matter present in the Universe.
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Dark matter regularly appears as a topic in hybrid periodicals that cover both factual scientific topics and science fiction, and dark matter itself has been referred to as "the stuff of science fiction". Mention of dark matter is made in works of fiction. In such cases, it is usually attributed extraordinary physical ...
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Francis Bacon, 1st Viscount St Alban (; 22 January 1561 – 9 April 1626), also known as Lord Verulam, was an English philosopher and statesman who served as Attorney General and Lord Chancellor of England. Bacon led the advancement of both natural philosophy and the scientific method and his works remained influential e...
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Bacon has been called the father of empiricism. He argued for the possibility of scientific knowledge based only upon inductive reasoning and careful observation of events in nature. He believed that science could be achieved by the use of a sceptical and methodical approach whereby scientists aim to avoid misleading t...
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Bacon was a patron of libraries and developed a system for cataloguing books under three categories – history, poetry, and philosophy – which could further be divided into specific subjects and subheadings. About books he wrote, "Some books are to be tasted; others swallowed; and some few to be chewed and digested." Th...
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Bacon was educated at Trinity College at the University of Cambridge, where he rigorously followed the medieval curriculum, which was presented largely in Latin. He was the first recipient of the Queen's counsel designation, conferred in 1597 when Elizabeth I reserved him as her legal advisor. After the accession of Ja...
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Francis Bacon was born on 22 January 1561 at York House near Strand in London, the son of Sir Nicholas Bacon (Lord Keeper of the Great Seal) by his second wife, Anne (Cooke) Bacon, the daughter of the noted Renaissance humanist Anthony Cooke. His mother's sister was married to William Cecil, 1st Baron Burghley, making ...
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Biographers believe that Bacon was educated at home in his early years owing to poor health, which would plague him throughout his life. He received tuition from John Walsall, a graduate of Oxford with a strong leaning toward Puristanism. He attended Trinity College at the University of Cambridge on 5 April 1573 at the...
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His studies brought him to the belief that the methods and results of science as then practised were erroneous. His reverence for Aristotle conflicted with his rejection of Aristotelian philosophy, which seemed to him barren, argumentative and wrong in its objectives.
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On 27 June 1576, he and Anthony entered "de societate magistrorum" at Gray's Inn. A few months later, Francis went abroad with Sir Amias Paulet, the English ambassador at Paris, while Anthony continued his studies at home. The state of government and society in France under Henry III afforded him valuable political ins...
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The sudden death of his father in February 1579 prompted Bacon to return to England. Sir Nicholas had laid up a considerable sum of money to purchase an estate for his youngest son, but he died before doing so, and Francis was left with only a fifth of that money. Having borrowed money, Bacon got into debt. To support ...
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Bacon stated that he had three goals: to uncover truth, to serve his country, and to serve his church. He sought to achieve these goals by seeking a prestigious post. In 1580, through his uncle, Lord Burghley, he applied for a post at court that might enable him to pursue a life of learning, but his application failed....
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His parliamentary career began when he was elected MP for Bossiney, Cornwall, in a by-election in 1581. In 1584 he took his seat in Parliament for Melcombe in Dorset, and in 1586 for Taunton. At this time, he began to write on the condition of parties in the church, as well as on the topic of philosophical reform in th...
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About this time, he again approached his powerful uncle for help; this move was followed by his rapid progress at the bar. He became a bencher in 1586 and was elected a Reader in 1587, delivering his first set of lectures in Lent the following year. In 1589, he received the valuable appointment of reversion to the Cler...
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In 1588 he became MP for Liverpool and then for Middlesex in 1593. He later sat three times for Ipswich (1597, 1601, 1604) and once for Cambridge University (1614).
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He became known as a liberal-minded reformer, eager to amend and simplify the law. Though a friend of the crown, he opposed feudal privileges and dictatorial powers. He spoke against religious persecution. He struck at the House of Lords in its usurpation of the Money Bills. He advocated for the union of England and Sc...
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Bacon soon became acquainted with Robert Devereux, the 2nd Earl of Essex, Queen Elizabeth's favourite. By 1591 he acted as the earl's confidential adviser. In 1592, he was commissioned to write a tract in response to the Jesuit Robert Parson's anti-government polemic, which he titled "Certain Observations Made upon a L...
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When the office of Attorney General fell vacant in 1594, Lord Essex's influence was not enough to secure the position for Bacon and it was given to Sir Edward Coke. Likewise, Bacon failed to secure the lesser office of Solicitor General in 1595, the Queen pointedly snubbing him by appointing Sir Thomas Fleming instead....
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In 1597 Bacon became the first Queen's Counsel designate, when Queen Elizabeth reserved him as her legal counsel. In 1597, he was also given a patent, giving him precedence at the Bar. Despite his designations, he was unable to gain the status and notoriety of others. In a plan to revive his position he unsuccessfully ...
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With others, Bacon was appointed to investigate the charges against Essex. A number of Essex's followers confessed that Essex had planned a rebellion against the Queen. Bacon was subsequently a part of the legal team headed by the Attorney General Sir Edward Coke at Essex's treason trial. After the execution, the Queen...
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According to his personal secretary and chaplain, William Rawley, as a judge Bacon was always tender-hearted, "looking upon the examples with the eye of severity, but upon the person with the eye of pity and compassion". And also that "he was free from malice", "no revenger of injuries", and "no defamer of any man".
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The succession of James I brought Bacon into greater favour. He was knighted in 1603. In another shrewd move, Bacon wrote his "Apologies" in defense of his proceedings in the case of Essex, as Essex had favoured James to succeed to the throne. The following year, during the course of the uneventful first parliament ses...
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In 1613, Bacon was finally appointed attorney general, after advising the king to shuffle judicial appointments. As attorney general, Bacon, by his zealous efforts—which included torture—to obtain the conviction of Edmund Peacham for treason, raised legal controversies of high constitutional importance; and successfull...
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Bacon continued to use his influence with the king to mediate between the throne and Parliament, and in this capacity he was further elevated in the same peerage, as Viscount St Alban, on 27 January 1621.
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Bacon's public career ended in disgrace in 1621. After he fell into debt, a parliamentary committee on the administration of the law charged him with 23 separate counts of corruption. His lifelong enemy, Sir Edward Coke, who had instigated these accusations, was one of those appointed to prepare the charges against the...
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There seems little doubt that Bacon had accepted gifts from litigants, but this was an accepted custom of the time and not necessarily evidence of deeply corrupt behaviour. While acknowledging that his conduct had been lax, he countered that he had never allowed gifts to influence his judgement and, indeed, he had on o...
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As the conduct of accepting gifts was ubiquitous and common practice, and the Commons was zealously inquiring into judicial corruption and malfeasance, it has been suggested that Bacon served as a scapegoat to divert attention from the clandestine and favorite of King James I own ill practice and alleged corruption.
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The true reason for his acknowledgement of guilt is the subject of debate, but some authors speculate that it may have been prompted by his sickness, or by a view that through his fame and the greatness of his office he would be spared harsh punishment. He may even have been blackmailed, with a threat to charge him wit...
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The British jurist Basil Montagu wrote in Bacon's defense, concerning the episode of his public disgrace:
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Bacon was a devout Anglican. He believed that philosophy and the natural world must be studied inductively, but argued that we can only study arguments for the existence of God. Information on his attributes (such as nature, action, and purposes) can only come from special revelation. Bacon also held that knowledge was...
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Bacon's idea of idols of the mind may have self-consciously represented an attempt to Christianize science at the same time as developing a new, reliable scientific method; Bacon gave worship of Neptune as an example of the idola tribus fallacy, hinting at the religious dimensions of his critique of the idols.
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Bacon was against the splintering within Christianity, believing that it would ultimately lead to the creation of atheism as a dominant worldview, as indicated with his quote that "The causes of atheism are: divisions in religion, if they be many; for any one main division, addeth zeal to both sides; but many divisions...
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When he was 36, Bacon courted Elizabeth Hatton, a young widow of 20. Reportedly, she broke off their relationship upon accepting marriage to a wealthier man, Bacon's rival, Sir Edward Coke. Years later, Bacon still wrote of his regret that the marriage to Hatton had not taken place.
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At the age of 45, Bacon married Alice Barnham, the 13-year-old daughter of a well-connected London alderman and MP. Bacon wrote two sonnets proclaiming his love for Alice. The first was written during his courtship and the second on his wedding day, 10 May 1606. When Bacon was appointed lord chancellor, "by special War...
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However, an increasing number of reports circulated about friction in the marriage, with speculation that this may have been due to Alice's making do with less money than she had once been accustomed to. It was said that she was strongly interested in fame and fortune, and when household finances dwindled, she complain...
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Several authors believe that, despite his marriage, Bacon was primarily attracted to men. Forker, for example, has explored the "historically documentable sexual preferences" of both Francis Bacon and King James I and concluded they were both oriented to "masculine love", a contemporary term that "seems to have been us...
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The well-connected antiquary John Aubrey noted in his "Brief Lives" concerning Bacon, "He was a Pederast. His Ganimeds and Favourites tooke Bribes". ("Pederast" in Renaissance diction meant generally "homosexual" rather than specifically a lover of minors; "ganimed" derives from the mythical prince abducted by Zeus to ...
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The Jacobean antiquarian Sir Simonds D'Ewes (Bacon's fellow Member of Parliament) implied there had been a question of bringing him to trial for buggery, which his brother Anthony Bacon had also been charged with.
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In his "Autobiography and Correspondence", in the diary entry for 3 May 1621, the date of Bacon's censure by Parliament, D'Ewes describes Bacon's love for his Welsh serving-men, in particular Godrick, a "very effeminate-faced youth" whom he calls "his catamite and bedfellow".
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This conclusion has been disputed by others, who point to lack of consistent evidence, and consider the sources to be more open to interpretation. Publicly, at least, Bacon distanced himself from the idea of homosexuality. In his "New Atlantis", he described his utopian island as being "the chastest nation under heaven...
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On 9 April 1626, Francis Bacon died of pneumonia while at Arundel mansion at Highgate outside London. An influential account of the circumstances of his death was given by John Aubrey's "Brief Lives". Aubrey's vivid account, which portrays Bacon as a martyr to experimental scientific method, had him journeying to High-...
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After stuffing the fowl with snow, Bacon contracted a fatal case of pneumonia. Some people, including Aubrey, consider these two contiguous, possibly coincidental events as related and causative of his death:Aubrey has been criticized for his evident credulousness in this and other works; on the other hand, he knew Tho...
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Being unwittingly on his deathbed, the philosopher dictated his last letter to his absent host and friend Lord Arundel:
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He was buried in St Michael's church in St Albans. At the news of his death, over 30 great minds collected together their eulogies of him, which were then later published in Latin.
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He left personal assets of about £7,000 and lands that realised £6,000 when sold. His debts amounted to more than £23,000, equivalent to more than £4m at current value.
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Francis Bacon's philosophy is displayed in the vast and varied writings he left, which might be divided into three great branches:
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Bacon's seminal work "Novum Organum" was influential in the 1630s and 1650s among scholars, in particular Sir Thomas Browne, who in his encyclopedia "Pseudodoxia Epidemica" (1646–72) frequently adheres to a Baconian approach to his scientific enquiries. This book entails the basis of the scientific method as a means of...
https://en.wikipedia.org/wiki?curid=11319
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According to Bacon, learning and knowledge all derive from the basis of inductive reasoning. Through his belief in experimental encounters, he theorised that all the knowledge that was necessary to fully understand a concept could be attained using induction. In order to get to the point of an inductive conclusion, one...
https://en.wikipedia.org/wiki?curid=11319
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Bacon explains how we come to this understanding and knowledge because of this process in comprehending the complexities of nature. "Bacon sees nature as an extremely subtle complexity, which affords all the energy of the natural philosopher to disclose her secrets." Bacon described the evidence and proof revealed thro...
https://en.wikipedia.org/wiki?curid=11319