Cosmology & Big Bang Nucleosynthesis: Foundational Epochs & Key Milestones
Encyclopedia/1. The Cosmos & The Natural World/3. Astronomy & Planetary Science • Curated by Admin Timeline.sg
Cosmology and Big Bang Nucleosynthesis trace humanity's understanding of the universe from ancient mythologies to modern precision cosmology, encompassing the discovery of cosmic expansion, the cosmic microwave background, and the origin of light elements.
Chronological Storyline (44 Milestones)
3000 BCE
Mesopotamian Cosmology
Ancient Mesopotamians develop a flat Earth cosmology with a domed sky, influencing later Near Eastern and Greek thought. #cosmology #history
Mesopotamian Cosmology By Unknown author - British Museum image page, Public domain, https://commons.wikimedia.org/w/index.php?curid=1748616
500 BCE
Pythagorean Spherical Earth
Pythagoras and his followers propose a spherical Earth and a central fire, introducing mathematical order to cosmology. #cosmology #ancient
350 BCE
Aristotle's Geocentric Universe
Aristotle's De Caelo describes a finite, geocentric universe with concentric spheres, dominating Western cosmology for nearly two millennia. #cosmology #philosophy
Aristotle's Geocentric Universe By Unknown author - http://grid.ceth.rutgers.edu/ancient/greek/aristotle_greek/, Public domain, https://commons.wikimedia.org/w/index.php?curid=269946
140 CE
Ptolemy's Almagest
Claudius Ptolemy's Almagest codifies the geocentric model with epicycles, becoming the standard astronomical text for over 1,200 years. #cosmology #astronomy
Ptolemy's Almagest By Ptolemy - http://www.univie.ac.at/hwastro/rare/1515_ptolemae.htm, Public domain, https://commons.wikimedia.org/w/index.php?curid=29985717
500 CE
Indian Jaina Cosmology
Jain scriptures describe a cyclical universe with an infinite number of worlds, challenging linear cosmic models. #cosmology #indian
964 CE
Al-Sufi's Book of Fixed Stars
Persian astronomer Abd al-Rahman al-Sufi publishes the Book of Fixed Stars, merging Islamic observations with Ptolemaic cosmology. #cosmology #islamic
Al-Sufi's Book of Fixed Stars By Abd al-Rahman al-Sufi - Google Art Project Museum of Islamic Art, Doha, Public domain, https://commons.wikimedia.org/w/index.php?curid=36270259
Jul 4, 1054 CE
Chinese Observation of SN 1054
Chinese astronomers record the supernova that created the Crab Nebula, providing early evidence of stellar evolution and cosmic change. #cosmology #astronomy
Chinese Observation of SN 1054 By NASA, ESA, J. Hester and A. Loll (Arizona State University) - A Giant Hubble Mosaic of the Crab Nebula, Public domain, https://commons.wikimedia.org/w/index.php?curid=516106
1277 CE
Condemnation of Aristotelianism
The Bishop of Paris condemns 219 Aristotelian theses, opening intellectual space for alternative cosmologies like the possibility of multiple worlds. #cosmology #medieval
Condemnation of Aristotelianism By Étienne Tempier (also: Stephanus of Orleans) (Uploaded by Stephan Dinkgreve) - https://gallica.bnf.fr/ark:/12148/btv1b9078319v/f70.item, Public domain, https://commons.wikimedia.org/w/index.php?curid=192011542
May 24, 1543 CE
Copernicus' De Revolutionibus
Nicolaus Copernicus publishes De revolutionibus orbium coelestium, proposing a heliocentric model that revolutionizes cosmology. #cosmology #science
Copernicus' De Revolutionibus By derivative work of Johannes Petreius 1543 edition of File:Nicolai_Copernici_torinensis_De_revolutionibus_orbium_coelestium.djvu - File:Nicolai_Copernici_torinensis_De_revolutionibus_orbium_coelestium.djvu, Public domain, https://commons.wikimedia.org/w/index.php?curid=5611684
1576 CE
Thomas Digges' Infinite Universe
Thomas Digges extends Copernicus' model, suggesting an infinite universe filled with stars, challenging the finite celestial sphere. #cosmology #renaissance
Feb 17, 1600 CE
Giordano Bruno Burned at Stake
Giordano Bruno is executed for heresy, partly for advocating an infinite universe with countless worlds, influencing later cosmological thought. #cosmology #history
Giordano Bruno Burned at Stake By Unknown author - https://wellcomeimages.org/indexplus/obf_images/bc/3d/265d1be073eb34224006d0d35b02.jpg Gallery: https://wellcomeimages.org/indexplus/image/L0015152.html Wellcome Collection gallery (2018-04-01): https://wellcomecollection.org/works/qgt4dt8k CC-BY-4.0, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=133537203
Mar 13, 1610 CE
Galileo's Sidereus Nuncius
Galileo Galilei publishes Sidereus Nuncius, detailing telescopic observations of the Moon, Jupiter's moons, and the Milky Way, supporting Copernican cosmology. #cosmology #astronomy
Galileo's Sidereus Nuncius By Galileo Galilei - Houghton Library, Public domain, https://commons.wikimedia.org/w/index.php?curid=35420870
Jul 5, 1687 CE
Newton's Principia
Isaac Newton's Philosophiæ Naturalis Principia Mathematica introduces universal gravitation and laws of motion, providing a mathematical framework for cosmology. #cosmology #physics
Newton's Principia By The original uploader was Zhaladshar at English Wikisource. - Transferred from en.wikisource to Commons. (previous image from another copy) Internet Archive (current image from the Bern Dibner copy), Public domain, https://commons.wikimedia.org/w/index.php?curid=2681838
1755 CE
Kant's General Natural History
Immanuel Kant proposes the nebular hypothesis, suggesting solar systems form from rotating gas clouds, and speculates about island universes. #cosmology #philosophy
Kant's General Natural History By Immanuel Kant - Scan of book cover, Public domain, https://commons.wikimedia.org/w/index.php?curid=76062534
1838 CE
First Stellar Parallax Measurement
Friedrich Bessel measures the parallax of 61 Cygni, confirming the heliocentric model and providing the first direct distance to a star. #cosmology #astronomy
First Stellar Parallax Measurement By Cygnus_constellation_map.png: Torsten Bronger derivative work: Kxx (talk) - Cygnus_constellation_map.png, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10828228
1864 CE
Lord Kelvin's Entropy Argument
William Thomson (Lord Kelvin) applies thermodynamics to the universe, arguing that it cannot be infinitely old due to entropy, presaging the heat death concept. #cosmology #thermodynamics
Lord Kelvin's Entropy Argument By NASA / WMAP Science Team - http://map.gsfc.nasa.gov/media/121238/ilc_9yr_moll4096.png, Public domain, https://commons.wikimedia.org/w/index.php?curid=23285693
Nov 25, 1915 CE
Einstein's General Relativity
Albert Einstein presents the field equations of general relativity, revolutionizing the understanding of gravity and enabling relativistic cosmology. #cosmology #physics
Einstein's General Relativity By Simulating eXtreme Spacetimes Lensing (SXS) - https://www.ligo.caltech.edu/video/ligo20160211v3 (video link); see also http://www.black-holes.org/gw150914, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=46994894
1917 CE
Einstein's Static Universe
Einstein introduces the cosmological constant to maintain a static universe, a model later abandoned after evidence of expansion. #cosmology #history
1922 CE
Friedmann's Expanding Universe
Alexander Friedmann derives solutions to Einstein's equations showing an expanding universe, laying the foundation for Big Bang theory. #cosmology #science
Friedmann's Expanding Universe By Unknown author - Cropped From, Public domain, https://commons.wikimedia.org/w/index.php?curid=2630080
1924 CE
Hubble's Cepheid Distance to Andromeda
Edwin Hubble identifies Cepheid variables in the Andromeda Nebula, proving it is a separate galaxy, expanding the scale of the universe. #cosmology #astronomy )
Hubble's Cepheid Distance to Andromeda By Unknown author - http://siarchives.si.edu/collections/siris_arc_306337?back=%2Fcollections%2Fsearch%3Fquery%3Dshapley%26page%3D1%26perpage%3D10%26sort%3Drelevancy%26view%3Dlist, Public domain, https://commons.wikimedia.org/w/index.php?curid=19170840
1927 CE
Lemaître's Primeval Atom
Georges Lemaître proposes the 'primeval atom' or 'Cosmic Egg' that exploded, the first formal Big Bang hypothesis. #cosmology #science
Lemaître's Primeval Atom By Unknown author - https://societyforthehistoryofastronomy.com/wp-content/uploads/2023/01/AA14-June-20.pdf, Public domain, https://commons.wikimedia.org/w/index.php?curid=154504242
1929 CE
Hubble's Law
Edwin Hubble publishes the linear relation between galaxy distances and recessional velocities, confirming universal expansion. #cosmology #astronomy
Hubble's Law By w:en:User:ScienceApologist - This image was copied from wikipedia:en. The original description was: The raisin bread model of the universe explains how each galaxy can perceive every other galaxy in the universe as receding from it. From the WMAP website., Public domain, https://commons.wikimedia.org/w/index.php?curid=2615116
1933 CE
Zwicky's Dark Matter
Fritz Zwicky discovers the 'missing mass' problem in galaxy clusters, first evidence for dark matter. #cosmology #astronomy
1948 CE
Alpher-Bethe-Gamow Paper
Ralph Alpher, Hans Bethe, and George Gamow publish the αβγ paper, predicting cosmic nucleosynthesis and the cosmic microwave background. #cosmology #nucleosynthesis
1949 CE
Hoyle Coins 'Big Bang'
Fred Hoyle, a steady-state proponent, pejoratively coins the term 'Big Bang' during a BBC radio broadcast. #cosmology #history
Hoyle Coins 'Big Bang' By NASA/WMAP Science Team - Original version: NASA; modified by Cherkash, Public domain, https://commons.wikimedia.org/w/index.php?curid=11885244
1964 CE
Penzias and Wilson Discover CMB
Arno Penzias and Robert Wilson accidentally detect the cosmic microwave background radiation, providing decisive evidence for the Big Bang. #cosmology #science
Penzias and Wilson Discover CMB By ESA and the Planck Collaboration - Cosmic Microwave Background, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=130789180
1965 CE
Dicke, Peebles, Roll, Wilkinson Interpretation
Robert Dicke, Jim Peebles, and colleagues interpret the CMB as the relic of the hot Big Bang, linking theory and observation. #cosmology #physics
1970 CE
Primordial Nucleosynthesis Calculations
Jim Peebles and others refine Big Bang nucleosynthesis models, accurately predicting abundances of light elements. #cosmology #nucleosynthesis
1980 CE
Inflation Theory Proposed
Alan Guth proposes cosmic inflation, solving the horizon and flatness problems of the Big Bang model. #cosmology #theory )
Apr 1, 1991 CE
COBE Measures CMB Anisotropy
The COBE satellite detects temperature fluctuations in the CMB, supporting inflation and seeding structure formation. #cosmology #space
Jan 1, 1998 CE
Accelerating Universe Discovery
Two teams using Type Ia supernovae discover the universe's expansion is accelerating, leading to the concept of dark energy. #cosmology #discovery
Jun 30, 2001 CE
WMAP Launched
NASA's Wilkinson Microwave Anisotropy Probe (WMAP) begins mapping CMB with high precision, refining cosmological parameters. #cosmology #space
WMAP Launched By NASA / WMAP Science Team - [1]; converted from the high-resolution TIFF version to a JPEG, Public domain, https://commons.wikimedia.org/w/index.php?curid=3944989
2003 CE
Sloan Digital Sky Survey Maps Galaxies
The SDSS creates a 3D map of over a million galaxies, constraining dark energy and structure formation. #cosmology #astronomy
Sloan Digital Sky Survey Maps Galaxies By Sloan Digital Sky Survey - http://skyserver.sdss.org/dr14/SkyServerWS/ImgCutout/getjpeg?TaskName=Skyserver.Chart.Image&ra=218.928604&dec=+08.300503&scale=0.3&width=800&height=800&opt=&query=, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=75828618
May 14, 2009 CE
Planck Satellite Launched
The ESA's Planck mission measures CMB with unprecedented precision, revealing detailed anisotropies and confirming the standard cosmological model. #cosmology #space )
Planck Satellite Launched By Photograph by Mike Peel (www.mikepeel.net). - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=14045307
Jul 4, 2012 CE
Higgs Boson Discovery
CERN announces the discovery of the Higgs boson, confirming the mechanism of mass generation, crucial for early universe physics. #cosmology #particlephysics
Higgs Boson Discovery By CERN for the ATLAS and CMS Collaborations - https://cds.cern.ch/record/1630222, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=29737816
Mar 17, 2014 CE
BICEP2 Claims Inflation Evidence
BICEP2 claims detection of primordial gravitational waves from inflation, later retracted due to dust contamination. #cosmology #inflation
BICEP2 Claims Inflation Evidence By NASA/JPL-Caltech - http://photojournal.jpl.nasa.gov/jpeg/PIA17993.jpg, Attribution, https://commons.wikimedia.org/w/index.php?curid=31669336
Feb 11, 2016 CE
LIGO Detects Gravitational Waves
LIGO announces first direct detection of gravitational waves from a black hole merger, opening a new window on the cosmos. #cosmology #physics
LIGO Detects Gravitational Waves By B. P. Abbott et al. (LIGO Scientific Collaboration and Virgo Collaboration) — full list at the end of the article - http://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.116.061102 . See also the associated Jupyter notebook., CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=46987868
Jul 1, 2018 CE
Dark Energy Survey Year 1 Results
The Dark Energy Survey releases its first-year cosmological constraints, measuring dark energy with high precision. #cosmology #astronomy
Dark Energy Survey Year 1 Results By Felipe Menanteau and the Dark Energy Survey Collaboration - https://opensource.ncsa.illinois.edu/confluence/pages/viewpage.action?pageId=61604315, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=59740733
Oct 8, 2019 CE
Nobel Prize for Cosmology
James Peebles wins Nobel Prize in Physics for theoretical discoveries in physical cosmology, recognizing the field's maturity. #cosmology #award
Apr 28, 2020 CE
Event Horizon Telescope Images Black Hole
First image of a supermassive black hole in M87 confirms General Relativity in strong gravity, relevant to cosmology. #cosmology #astronomy
Event Horizon Telescope Images Black Hole By D. Marrone/UofA - Event Horizon Telescope Collaboration, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=133002860
Dec 25, 2021 CE
James Webb Space Telescope Launch
James Webb Space Telescope launches, designed to observe the first galaxies and stars, exploring cosmic dawn. #cosmology #space
James Webb Space Telescope Launch By NASA - https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html, Public domain, https://commons.wikimedia.org/w/index.php?curid=114125719
Jul 12, 2022 CE
JWST First Images Released
NASA releases the first science images from JWST, including deep fields and exoplanet spectra, revolutionizing cosmology. #cosmology #space
Nov 21, 2023 CE
Euclid Mission Launched
ESA's Euclid mission launches to map dark energy and dark matter across cosmic time, addressing fundamental cosmology questions. #cosmology #space )
Euclid Mission Launched By European Space Agency - Euclid looking into the Universe, CC BY-SA 3.0 igo, https://commons.wikimedia.org/w/index.php?curid=128347141
2024 CE
Current Cosmological Tensions
Discrepancies in Hubble constant measurements from early and late universe (Hubble tension) remain unresolved, driving new research. #cosmology #controversy
