Timeline of cosmological theories
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This timeline of cosmological theories and discoveries is a chronological record of the development of humanity's understanding of the cosmos over the last two-plus millennia. Modern cosmological ideas follow the development of the scientific discipline of physical cosmology.
For millennia, what today is known to be the Solar System was regarded as the contents of the "whole universe", so advances in the knowledge of both mostly paralleled. Clear distinction was not made until circa mid-17th century. See Timeline of Solar System astronomy for further details on this side.
Antiquity
- c. 16th century BCE – Mesopotamian cosmology has a flat, circular Earth enclosed in a cosmic ocean.[1]
- c. 15th–11th century BCE – The unmanifest for an equal length. The universe remains manifest for 4.32 billion years and unmanifestfor an equal length. Innumerable universes exist simultaneously. These cycles have and will last forever, driven by desires.
- c. 15th–6th century BCE – During this period, Zoroastrian Cosmology Develops and defines Creation as a manifestation of a cosmic conflict between existence and non-existence, good and evil, and light and darkness.
- 6th century BCE – The Babylonian Map of the World shows the Earth surrounded by the cosmic ocean, with seven islands arranged around it so as to form a seven-pointed star. Contemporary Biblical cosmology reflects the same view of a flat, circular Earth swimming on water and overarched by the solid vault of the firmament to which are fastened the stars.
- 6th–4th century BCE – Greek philosophers, as early as Anaximander,[2] introduce the idea of multiple or even infinite universes.[3] Democritus further detailed that these worlds varied in distance, size; the presence, number and size of their suns and moons; and that they are subject to destructive collisions.[4] Also during this time period, the Greeks established that the Earth is spherical rather than flat.[5][6]
- 6th century BCE – Peloponnesus[9]), and consequently, he realized how far from Earth it might be. In his system the celestial bodies turned at different distances. At the origin, after the separation of hot and cold, a ball of flame appeared that surrounded Earth like bark on a tree. This ball broke apart to form the rest of the Universe. It resembled a system of hollow concentric wheels, filled with fire, with the rims pierced by holes like those of a flute. Consequently, the Sun was the fire that one could see through a hole the same size as the Earth on the farthest wheel, and an eclipse corresponded with the occlusion of that hole. The diameter of the solar wheel was twenty-seven times that of the Earth (or twenty-eight, depending on the sources)[10] and the lunar wheel, whose fire was less intense, eighteen (or nineteen) times. Its hole could change shape, thus explaining lunar phases. The stars and the planets, located closer,[11] followed the same model.[12]
- 5th century BCE – the centre of the universe.[13]
- 5th century BCE – Pythagoreans as Philolaus believed the motion of planets is caused by an out-of-sight "fire" at the centre of the universe (not the Sun) that powers them, and Sun and Earth orbit that Central Fire at different distances. The Earth's inhabited side is always opposite to the Central Fire, rendering it invisible to people. They also claimed that the Moon and the planets orbit the Earth.[14] This model depicts a moving Earth, simultaneously self-rotating and orbiting around an external point (but not around the Sun), thus not being geocentrical, contrary to common intuition. Due to philosophical concerns about the number 10 (a "perfect number" for the Pythagorians), they also added a tenth "hidden body" or Counter-Earth (Antichthon), always in the opposite side of the invisible Central Fire and therefore also invisible from Earth.[15]
- 4th century BCE –
- 4th century BCE – Eudoxus of Cnidus devised a geometric-mathematical model for the movements of the planets, the first known effort in this sense, based on (conceptual) concentric spheres centered on Earth.[22] To explain the complexity of the movements of the planets along with that of the Sun and the Moon, Eudoxus thought they move as if they were attached to a number of concentrical, invisible spheres, every of them rotating around its own and different axis and at different paces. His model had twenty-seven homocentric spheres with each sphere explaining a type of observable motion for each celestial object. Eudoxus emphasised that this is a purely mathematical construct of the model in the sense that the spheres of each celestial body do not exist, it just shows the possible positions of the bodies.[23] His model was later refined and expanded by Callippus.
- 4th century BCE – Aristotle follows the Plato's Earth-centered universe in which the Earth is stationary and the cosmos (or universe) is finite in extent but infinite in time. He argued for a spherical Earth using lunar eclipses[24] and other observations. Aristotle adopted and expanded even more the previous Eudoxus' and Callippus' model, but by supposing the spheres were material and crystalline.[25] Aristotle also tried to determine whether the Earth moves and concluded that all the celestial bodies fall towards Earth by natural tendency and since Earth is the centre of that tendency, it is stationary.[26] Plato seems to have obscurely argued that the universe did have a beginning, but Aristotle and others interpreted his words differently.[27]
- 4th century BCE –
- 4th century BCE – Earth rotates on its axis, from west to east, once every 24 hours, contradicting Aristotle's teachings. Simplicius says that Heraclides proposed that the irregular movements of the planets can be explained if the Earth moves while the Sun stays still,[29] but these statements are disputed.[30]
- 3rd century BCE – Aristarchus of Samos proposes a Sun-centered universe and Earth's rotation in its own axis. He also provides evidences for his theory from his own observations.[31]
- 3rd century BCE – light years, if Aristarchus' theories were correct.
- 2nd century BCE – Seleucus of Seleucia elaborates on Aristarchus' heliocentric universe, using the phenomenon of tides to explain heliocentrism. Seleucus was the first to prove the heliocentric system through reasoning. Seleucus' arguments for a heliocentric cosmology were probably related to the phenomenon of tides. According to Strabo (1.1.9), Seleucus was the first to state that the tides are due to the attraction of the Moon, and that the height of the tides depends on the Moon's position relative to the Sun. Alternatively, he may have proved heliocentricity by determining the constants of a geometric model for it.[32]
- 2nd century BCE – Apollonius of Perga shows the equivalence of two descriptions of the apparent retrograde planet motions (assuming the geocentric model), one using eccentrics and another deferent and epicycles.[33] The latter will be a key feature for future models. The epicycle is described as a small orbit within a greater one, called the deferent: as a planet orbits the Earth, it also orbits the original orbit, so its trajectory resembles a curve known as an epitrochoid. This could explain how the planet seems to move as viewed from Earth.
- 2nd century BCE – Eratosthenes determines that the radius of the Earth is roughly 6,400 km.[34]
- 2nd century BCE – star catalog of about 850 entries.[36]
- c. 2nd century BCE–3rd century CE – In kalpa (day of Brahma) period lasting for 4.32 billion years, and is followed by a pralaya (night) period of partial dissolution equal in duration. In some Puranas (e.g. Bhagavata Purana), a larger cycle of time is described where matter (mahat-tattva or universal womb) is created from primal matter (prakriti) and root matter (pradhana) every 622.08 trillion years, from which Brahma is born.[37] The elements of the universe are created, used by Brahma, and fully dissolved within a maha-kalpa (life of Brahma; 100 of his 360-day years) period lasting for 311.04 trillion years containing 36,000 kalpas (days) and pralayas (nights), and is followed by a maha-pralaya period of full dissolution equal in duration.[38][39][40][41] The texts also speak of innumerable worlds or universes.[42]
- 2nd century CE – The Almagest, which also cataloged 1,022 stars and other astronomical objects (largely based upon Hipparchus'), remained the most authoritative text on astronomy and largest astronomical catalogue until the 17th century.[44][45]
Middle Ages
- 2nd century CE-5th century CE – Jain cosmology considers the loka, or universe, as an uncreated entity, existing since infinity, the shape of the universe as similar to a man standing with legs apart and arm resting on his waist. This Universe, according to Jainism, is broad at the top, narrow at the middle and once again becomes broad at the bottom.
- 5th century (or earlier) – Buddhist texts speak of "hundreds of thousands of billions, countlessly, innumerably, boundlessly, incomparably, incalculably, unspeakably, inconceivably, immeasurably, inexplicably many worlds" to the east, and "infinite worlds in the ten directions".[46][47]
- 5th century – Several Indian astronomers propose a rudimentary Sun-centered universe, including Aryabhata. He also writes a treatise on motion of planets, Sun and Moon and stars. Aryabhatta puts forward the theory of rotation of the Earth in its own axis and explained day and night was caused by the diurnal rotation of the Earth. He also provided empirical evidence for his notion from his astronomical experiments and observation.[48]
- 5th century – The Jewish talmud gives an argument for finite universe theory along with explanation.
- 5th century – Martianus Capella describes a modified geocentric model, in which the Earth is at rest in the center of the universe and circled by the Moon, the Sun, three planets and the stars, while Mercury and Venus circle the Sun, all surrounded by the sphere of fixed stars.[49]
- 6th century – John Philoponus proposes a universe that is finite in time and argues against the ancient Greek notion of an infinite universe
- 7th century – The Quran says in Chapter 21: Verse 30 – "Have those who disbelieved not considered that the Heavens and the Earth were a joined entity, and We separated them".
- 9th–12th centuries – Al-Kindi (Alkindus), Saadia Gaon (Saadia ben Joseph) and Al-Ghazali (Algazel) support a universe that has a finite past and develop two logical arguments for the notion.
- 12th century –
- 12th century – Robert Grosseteste described the birth of the Universe in an explosion and the crystallisation of matter. He also put forward several new ideas such as rotation of the Earth around its axis and the cause of day and night. His treatise De Luce is the first attempt to describe the heavens and Earth using a single set of physical laws.[51]
- 14th century – Levi ben Gershon (Gersonides) estimates the distance to the outermost orb of the fixed stars to be no less than 159,651,513,380,944 Earth radii, or about 100,000 light-years in modern units.[52]
- 14th century – Several European mathematicians and astronomers develop the theory of Earth's rotation including Nicole Oresme. Oresme also give logical reasoning, empirical evidence and mathematical proofs for his notion.[53][54]
- 15th century – Nicholas of Cusa proposes that the Earth rotates on its axis in his book, On Learned Ignorance (1440).[55] Like Oresme, he also wrote about the possibility of the plurality of worlds.[56]
Renaissance
- 1501 – Indian astronomer Nilakantha Somayaji proposes a universe in which the planets orbit the Sun, but the Sun orbits the Earth.[57]
- 1543 – Nicolaus Copernicus publishes his heliocentric universe in his De revolutionibus orbium coelestium.[58]
- 1576 – Thomas Digges modifies the Copernican system by removing its outer edge and replacing the edge with a star-filled unbounded space.[59]
- 1584 – Giordano Bruno proposes a non-hierarchical cosmology, wherein the Copernican Solar System is not the center of the universe, but rather, a relatively insignificant star system, amongst an infinite multitude of others.[60]
- 1588 – Tycho Brahe publishes his own Tychonic system, a blend between Ptolemy's classical geocentric model and Copernicus' heliocentric model, in which the Sun and the Moon revolve around the Earth, in the center of universe, and all other planets revolve around the Sun.[61] It is a geo-heliocentric model similar to that described by Somayaji.
- 1600 – William Gilbert rejects the idea of a limiting sphere of the fixed stars for which no proof has been offered.[62]
- 1609 – Galileo Galilei examines the skies and constellations through a telescope and concluded that the "fixed stars" which had been studied and mapped were only a tiny portion of the massive universe that lay beyond the reach of the naked eye.[63] When in 1610 he aimed his telescope to the faint strip of the Milky Way, he found it resolves into countless white star-like spots, presumably farther stars themselves.[64]
- 1610 – Kepler's laws universal.[65]
Enlightenment to Victorian Era
- 1659 – Christiaan Huygens makes precise measurements of the angular distance between the Sun and Venus, which were based on the first absolute measurements of the Astronomical unit.[66]
- 1672 – Jean Richer and Giovanni Domenico Cassini measure the Earth-Sun distance, the astronomical unit, to be about 138,370,000 km.[67] Later it will be refined by others up to the current value of 149,597,870 km.
- 1675 – Ole Rømer uses the orbital mechanics of Jupiter's moons to estimate that the speed of light is about 227,000 km/s.[68]
- 1687 – laws describe large-scale motion throughout the universe. The universal force of gravity suggested that stars could not simply be fixed or at rest, as their gravitational pulls cause "mutual attraction" and therefore cause them to move in relation to each other.[69]
- 1704 – John Locke enters the term "Solar System" in the English language, when he used it to refer to the Sun, planets, and comets as a whole.[70] By then it had been stablished beyond doubt that planets are other worlds, and stars are other distant suns, so the whole Solar System is actually only a small part of an immensely large universe, and definitively something distinct.
- 1718 –
- 1720 – Edmund Halley puts forth an early form of Olbers' paradox.
- 1729 – aberration of light, which proved the Earth's motion around the Sun,[72] and also provides a more accurate method to compute the speed of lightcloser to its actual value of about 300,000 km/s.
- 1744 – Jean-Philippe de Cheseauxputs forth an early form of Olbers' paradox.
- 1755 – island universes.
- 1781 – star clusters, the most prominent deep-sky objects that can easily be observed from Earth's Northern Hemisphere, in order not to be confused with ordinary Solar System's comets.[73]
- 1785 – Milky Way Galaxy.[74]
- 1791 – Erasmus Darwin pens the first description of a cyclical expanding and contracting universe in his poem The Economy of Vegetation.
- 1796 –
- 1826 – Olbers' paradox.
- 1832–1838 – Following over 100 years of unsuccessful attempts, Thomas Henderson,[76] Friedrich Bessel,[77] and Otto Struve measure the parallax of a few nearby stars; these are the first measurements of any distances outside the Solar System.
- 1842 – electromagnetic waves in 1848.[79]
- 1848 – Edgar Allan Poe offers first correct solution to Olbers' paradox in Eureka: A Prose Poem, an essay that also suggests the expansion and collapse of the universe.
- 1860s – Orion nebula is mostly made of gas, while the Andromeda nebula (later called Andromeda Galaxy) is probably dominated by stars.
- 1862 – By analysing the spectroscopic signature of the Sun and comparing it to those of other stars, Father Angelo Secchi determines that the Sun in itself is also a star.[80]
- 1887 – The relative motion of Earth through the (assumed) stationary luminiferous aether, got no results. This put an end to the centuries-old idea of the aether, dating back to Aristotle, and with it all the contemporary aether theories.[81]
- 1897 – atomic model of matter.[82]
- 1897 – William Thomson, 1st Baron Kelvin, based on the thermal radiation rate and the gravitational contraction forces, argues the age of the Sun to be no more than 20 million years – unless some energy source beyond what was then known was found.[83]
1901–1950
- 1904 – Ernest Rutherford argues, in a lecture attended by Kelvin, that radioactive decay releases heat, providing the unknown energy source Kelvin had suggested, and ultimately leading to radiometric dating of rocks which reveals ages of billions of years for the Solar System bodies, hence the Sun and all the stars.[84]
- 1905 – interchangeable.
- 1912 – Henrietta Leavitt discovers the period-luminosity law for Cepheid variablestars, which becomes a crucial step in measuring distances to other galaxies.
- 1913 – spectral lines, and definitively established the quantum mechanics behaviour of the matter.[85]
- 1915 – Robert Innes discovers Proxima Centauri, the closest star to Earth after the Sun.[86]
- 1915 – Albert Einstein publishes the General Theory of Relativity, showing that an energy density warps spacetime.
- 1917 – expanding cosmology with a cosmological constant, termed a de Sitter universe.
- 1918 – globular clusters showed that the heliocentrism model of cosmology was wrong, and galactocentrism replaced heliocentrism as the dominant model of cosmology.[74]
- 1919 – General Theory of Relativity.[87]
- 1920 – The Smithsonian.
- 1921 – The
- 1922 – Vesto Slipher summarizes his findings on the spiral nebulae's systematic redshifts.
- 1922 – Einstein field equationswhich suggests a general expansion of space.
- 1923 – Edwin Hubble measures distances to a few nearby spiral nebulae (galaxies), the Andromeda Galaxy (M31), Triangulum Galaxy (M33), and NGC 6822. The distances place them far outside the Milky Way, and implies that fainter galaxies are much more distant, and the universe is composed of many thousands of galaxies.
- 1924 – Louis de Broglie asserts that moderately accelerated electrons must show an associated wave.[89] This was later confirmed by the Davisson–Germer experiment in 1927.[90]
- 1927 – Georges Lemaître discusses the creation event of an expanding universe governed by the Einstein field equations. From its solutions to the Einstein equations, he predicts the distance-redshift relation.
- 1928 –
- 1928 – Howard P. Robertson briefly mentions that Vesto Slipher's redshift measurements combined with brightness measurements of the same galaxies indicate a redshift-distance relation.
- 1929 – Edwin Hubble demonstrates the linear redshift-distance relationship and thus shows the expansion of the universe.
- 1932 – radio signals coming from outer space as extrasolar, coming mainly from Sagittarius.[94] They are the first evidence of the center of the Milky Way, and the firsts experiences that founded the discipline of radio astronomy.
- 1933 – Edward Milne names and formalizes the cosmological principle.
- 1933 – Coma clusterof galaxies contains large amounts of dark matter. This result agrees with modern measurements, but is generally ignored until the 1970s.
- 1934 – Georges Lemaître interprets the cosmological constant as due to a vacuum energy with an unusual perfect fluid equation of state.
- 1938 –
- 1938 – Paul Dirac suggests the large numbers hypothesis, that the gravitational constant may be small because it is decreasing slowly with time.
- 1948 – "in absentia"), and George Gamow examine element synthesis in a rapidly expanding and cooling universe, and suggest that the elements were produced by rapid neutroncapture.
- 1948 – steady statecosmologies based on the perfect cosmological principle.
- 1948 – cosmic microwave background radiationby considering the behavior of primordial radiation in an expanding universe.
- 1950 – Fred Hoyle coins the term "Big Bang", saying that it was not derisive; it was just a striking image meant to highlight the difference between that and the Steady-State model.
1951–2000
- 1961 – Robert Dicke argues that carbon-based life can only arise when the gravitational force is small, because this is when burning stars exist; first use of the weak anthropic principle.
- 1963 – Maarten Schmidt discovers the first quasar; these soon provide a probe of the universe back to substantial redshifts.
- 1965 – ambiplasma to explain baryon asymmetryand supports the idea of an infinite universe.
- 1965 – Dennis Sciama analyze quasarsource count data and discover that the quasar density increases with redshift.
- 1965 – Robert Dicke, James Peebles, Peter Roll and David Todd Wilkinsoninterpret it as a relic from the Big Bang.
- 1966 – George Ellis show that any plausible general relativistic cosmology is singular.
- 1966 – James Peebles shows that the hot Big Bang predicts the correct helium abundance.
- 1967 – Andrei Sakharov presents the requirements for baryogenesis, a baryon-antibaryon asymmetry in the universe.
- 1967 – Wal Sargent, and Maarten Schmidt measure the fine-structure splitting of spectral lines in 3C191 and thereby show that the fine-structure constantdoes not vary significantly with time.
- 1967 – Robert Wagner, William Fowler, and Fred Hoyle show that the hot Big Bang predicts the correct deuterium and lithium abundances.
- 1968 – Brandon Carter speculates that perhaps the fundamental constants of nature must lie within a restricted range to allow the emergence of life; first use of the strong anthropic principle.
- 1969 – Charles Misner formally presents the Big Bang horizon problem.
- 1969 – Robert Dicke formally presents the Big Bang flatness problem.
- 1970 – Vera Rubin and Kent Ford measure spiral galaxy rotation curves at large radii, showing evidence for substantial amounts of dark matter.
- 1973 – Edward Tryon proposes that the universe may be a large scale quantum mechanical vacuum fluctuation where positive mass-energy is balanced by negative gravitational potential energy.
- 1976 – Alexander Shlyakhter uses samarium ratios from the Oklo prehistoric natural nuclear fission reactor in Gabon to show that some laws of physics have remained unchanged for over two billion years.
- 1977 – Gary Steigman, David Schramm, and James Gunn examine the relation between the primordial helium abundance and number of neutrinos and claim that at most five lepton families can exist.
- 1980 – inflationaryBig Bang universe as a possible solution to the horizon and flatness problems.
- 1981 – inflationaryuniverse.
- 1982 – The first CfA galaxy redshift survey is completed.
- 1982 – Several groups including James Peebles, J. Richard Bond and George Blumenthal propose that the universe is dominated by cold dark matter.
- 1983–1987 – The first large computer simulations of cosmic structure formation are run by Davis, Efstathiou, Frenk and White. The results show that cold dark matter produces a reasonable match to observations, but hot dark matter does not.
- 1988 – The CfA2 Great Wall is discovered in the CfA2 redshift survey.
- 1988 – Measurements of galaxy large-scale flows provide evidence for the Great Attractor.
- 1990 – The Hubble Space Telescope is launched.[97] It is aimed primarily at deep-space objects.
- 1990 – Preliminary results from blackbodyspectrum to an astonishing one part in 105 precision, thus eliminating the possibility of an integrated starlight model proposed for the background by steady state enthusiasts.
- 1992 – Further COBE measurements discover the very small anisotropy of the cosmic microwave background, providing a "baby picture" of the seeds of large-scale structure when the universe was around 1/1100th of its present size and 380,000 years old.
- 1992 – First planetary system beyond the Solar System detected, around the pulsar PSR B1257+12.[98]
- 1995 – The first planet around a Sun-like star is discovered, in orbit around the star 51 Pegasi.[99]
- 1996 – The first Hubble Deep Field is released, providing a clear view of very distant galaxies when the universe was around one-third of its present age.
- 1998 – Controversial evidence for the fine-structure constant varying over the lifetime of the universe is first published.
- 1998 – The Supernova Cosmology Project and High-Z Supernova Search Team discover cosmic acceleration based on distances to Type Ia supernovae, providing the first direct evidence for a non-zero cosmological constant.
- 1999 – Measurements of the cosmic microwave background radiation with finer resolution than COBE, (most notably by the BOOMERanG experiment see Mauskopf et al., 1999, Melchiorri et al., 1999, de Bernardis et al. 2000) provide evidence for oscillations (the first acoustic peak) in the anisotropyangular spectrum, as expected in the standard model of cosmological structure formation. The angular position of this peak indicates that the geometry of the universe is close to flat.
2001–present
- 2001 – The 2dF Galaxy Redshift Survey (2dF) by an Australian/British team gave strong evidence that the matter density is near 25% of critical density. Together with the CMB results for a flat universe, this provides independent evidence for a cosmological constant or similar dark energy.
- 2002 – The Cosmic Background Imager (CBI) in Chile obtained images of the cosmic microwave background radiation with the highest angular resolution of 4 arc minutes. It also obtained the anisotropy spectrum at high-resolution not covered before up to l ~ 3000. It found a slight excess in power at high-resolution (l > 2500) not yet completely explained, the so-called "CBI-excess".
- 2003 – NASA's inflation.
- 2003 – The Sloan Great Wall is discovered.
- 2004 – The Degree Angular Scale Interferometer (DASI) first obtained the E-mode polarization spectrum of the cosmic microwave background radiation.
- 2004 – heliosheath.[100]
- 2005 – The baryon acoustic oscillation feature in the galaxy distribution, a key prediction of cold dark mattermodels.
- 2006 – Three-year polarizationdata.
- 2009–2013 – cosmic microwave background radiation, with increased sensitivity and small angular resolution.
- 2006–2011 – Improved measurements from WMAP, new supernova surveys ESSENCE and SNLS, and baryon acoustic oscillations from SDSS and WiggleZ, continue to be consistent with the standard Lambda-CDM model.
- 2014 – Astrophysicists of the
- 2016 – LIGO Scientific Collaboration and Virgo Collaboration announce that gravitational waves were directly detected by two LIGO detectors. The waveform matched the prediction of General relativity for a gravitational wave emanating from the inward spiral and merger of a pair of black holes of around 36 and 29 solar masses and the subsequent "ringdown" of the single resulting black hole.[109][110][111] The second detection verified that GW150914 is not a fluke, thus opens entire new branch in astrophysics, gravitational-wave astronomy.[112][113]
- 2019 – The Event Horizon Telescope Collaboration publishes the image of the black hole at the center of the M87 Galaxy.[114] This is the first time astronomers have ever captured an image of a black hole, which once again proves the existence of black holes and thus helps verify Einstein's general theory of relativity.[115] This was done by utilising very-long-baseline interferometry.[116]
- 2020 – Physicist Hubble constant by proposing the notion of a surrounding vast "bubble", 250 million light years in diameter, that is half the density of the rest of the universe.[117][118]
- 2020 – Scientists publish a study which suggests that the Universe is no longer
- 2020 – Scientists report verifying measurements 2011–2014 via ULAS J1120+0641 of what seem to be a spatial variation in four measurements of the fine-structure constant, a basic physical constant used to measure electromagnetism between charged particles, which indicates that there might be directionality with varying natural constants in the Universe which would have implications for theories on the emergence of habitability of the Universe and be at odds with the widely accepted theory of constant natural laws and the standard model of cosmology which is based on an isotropic Universe.[124][125][126][127]
- 2021 – James Webb Space Telescope is launched.[128]
- 2023 – Astrophysicists questioned the overall current view of the Standard Model of Cosmology, based on the latest James Webb Space Telescope studies.[129]
See also
Physical cosmology
- Chronology of the universe
- List of cosmologists
- Interpretations of quantum mechanics
- Non-standard cosmology
Historical development of hypotheses
- Timeline of Solar System astronomy
- Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure
- Timeline of cosmic microwave background astronomy
- Historical models of the Solar System
- Fixed stars
Belief systems
Others
References
- ^ Horowitz (1998), p. xii
- ^ This is a matter of debate:
- Cornford, F. M. (1934). "Innumerable Worlds in Presocratic Philosophy". The Classical Quarterly. 28 (1): 1–16. S2CID 170168443.
- Curd, Patricia; Graham, Daniel W. (2008). The Oxford Handbook of Presocratic Philosophy. Oxford University Press. pp. 239–41. ISBN 978-0-19-972244-0.
- Gregory, Andrew (2016). "7 Anaximander: One Cosmos or Many?". Anaximander: A Re-assessment. Bloomsbury Publishing. pp. 121–142. ISBN 978-1472506252.
- Cornford, F. M. (1934). "Innumerable Worlds in Presocratic Philosophy". The Classical Quarterly. 28 (1): 1–16.
- ^
- Siegfried, Tom. "Long Live the Multiverse!". Scientific American.
- Siegfried, Tom (2019). "Aristotle versus the Atomists". The number of the heavens : a history of the multiverse and the quest to understand the cosmos. Harvard. ISBN 978-0674975880.
- ^ "there are innumerable worlds of different sizes. In some there is neither sun nor moon, in others they are larger than in ours and others have more than one. These worlds are at irregular distances, more in one direction and less in another, and some are flourishing, others declining. Here they come into being, there they die, and they are destroyed by collision with one another. Some of the worlds have no animal or vegetable life nor any water."
- Guthrie, W. K. C.; Guthrie, William Keith Chambers (1962). A History of Greek Philosophy: Volume 2, The Presocratic Tradition from Parmenides to Democritus. Cambridge University Press. pp. 404–06. ISBN 978-0-521-29421-8.
- Vamvacas, Constantine J. (2009). The Founders of Western Thought – The Presocratics: A diachronic parallelism between Presocratic Thought and Philosophy and the Natural Sciences. Springer Science & Business Media. pp. 219–20. ISBN 978-1-4020-9791-1.
- Guthrie, W. K. C.; Guthrie, William Keith Chambers (1962). A History of Greek Philosophy: Volume 2, The Presocratic Tradition from Parmenides to Democritus. Cambridge University Press. pp. 404–06.
- ^ "Ancient Greek Astronomy and Cosmology | Modeling the Cosmos | Articles and Essays | Finding Our Place in the Cosmos: From Galileo to Sagan and Beyond | Digital Collections | Library of Congress". Library of Congress. Washington, DC.
- ^ Blakemore, Erin. "Christopher Columbus Never Set Out to Prove the Earth was Round". History.com.
- ^ Aristotle, On the Heavens, ii, 13
- Aetiusreports in De Fide (III, 7, 1), or "similar to a pillar-shaped stone", pseudo-Plutarch (III, 10).
- S2CID 161940013.
- ^ In Refutation, it is reported that the circle of the Sun is twenty-seven times bigger than the Moon.
- ^ Aetius, De Fide (II, 15, 6)
- ^ Most of Anaximander's model of the Universe comes from pseudo-Plutarch (II, 20–28):
- "[The Sun] is a circle twenty-eight times as big as the Earth, with the outline similar to that of a fire-filled chariot wheel, on which appears a mouth in certain places and through which it exposes its fire, as through the hole on a flute. [...] the Sun is equal to the Earth, but the circle on which it breathes and on which it's borne is twenty-seven times as big as the whole earth. [...] [The eclipse] is when the mouth from which comes the fire heat is closed. [...] [The Moon] is a circle nineteen times as big as the whole earth, all filled with fire, like that of the Sun".
- Lives of the Eminent Philosophers. Vol. 2:9. Translated by Hicks, Robert Drew(Two volume ed.). Loeb Classical Library.
- ISBN 0-387-94107-X.
- ^ Dreyer, John Louis Emil (1906). History of the planetary systems from Thales to Kepler. p. 42.
To complete the number ten, Philolaus created the antichthon, or counter-earth. This tenth planet is always invisible to us, because it is between us and the central fire and always keeps pace with the Earth.
- ISBN 0-521-40340-5.
- ^ "The components from which he made the soul and the way in which he made it were as follows: In between the Being that is indivisible and always changeless, and the one that is divisible and comes to be in the corporeal realm, he mixed a third, intermediate form of being, derived from the other two. Similarly, he made a mixture of the Same, and then one of the Different, in between their indivisible and their corporeal, divisible counterparts. And he took the three mixtures and mixed them together to make a uniform mixture, forcing the Different, which was hard to mix, into conformity with the Same. Now when he had mixed these two with Being, and from the three had made a single mixture, he redivided the whole mixture into as many parts as his task required, each part remaining a mixture of the Same, the Different and Being." (35a-b), translation Donald J. Zeyl
- ^ Plato, Timaeus, 36c
- ^ Plato, Timaeus, 36d
- ^ Plato, Timaeus, 39d
- ^ Encyclopædia Britannica (2019). "heliocentrism | Definition, History, & Facts". Encyclopedia Britannica. Encyclopædia Britannica.
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