Exoplanets & Astrobiology: Global Cross-Cultural Milestones
Encyclopedia/1. The Cosmos & The Natural World/3. Astronomy & Planetary Science • Curated by Admin Timeline.sg
This timeline traces the global cross-cultural milestones in exoplanet discovery and astrobiology, from ancient philosophical speculations about other worlds to modern space-based observatories and the search for biosignatures.
Chronological Storyline (42 Milestones)
600 BCE
Anaximander Proposes Infinite Worlds
Greek philosopher Anaximander speculates about an infinite number of worlds in the cosmos, an early precursor to the concept of exoplanets. #philosophy #cosmology
Anaximander Proposes Infinite Worlds By Attributed to Pietro Bellotti - http://www.hampel-auctions.com/, Public domain, https://commons.wikimedia.org/w/index.php?curid=14690778
400 BCE
Democritus and Atomism Suggest Many Worlds
Greek philosopher Democritus proposes that atoms form infinite worlds, some with life, laying groundwork for astrobiology. #philosophy #atomism
Democritus and Atomism Suggest Many Worlds By user:shakko - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=5535206
300 BCE
Epicurus Writes on Other Worlds
Epicurus argues for a plurality of worlds in his letter to Herodotus, influencing later atomist thought. #philosophy #epicureanism
Epicurus Writes on Other Worlds By Unknown artist - Marie-Lan Nguyen (2011), Public domain, https://commons.wikimedia.org/w/index.php?curid=1447258
964 CE
Al-Sijzi Describes Earth's Rotation
Persian astronomer Al-Sijzi designs an astrolabe based on Earth's rotation, challenging geocentric models and opening possibilities for other worlds. #astronomy #islamicgoldenage
Al-Sijzi Describes Earth's Rotation By Dr. Klaus Zimmermann - http://www.universitaetssammlungen.de/modell/201 (Goethe Universität Frankfurt/a.M.), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=88765848
1054 CE
Chinese Astronomers Record SN 1054
Chinese astronomers document the supernova that created the Crab Nebula, demonstrating systematic celestial observation. #astronomy #china
Chinese Astronomers Record SN 1054 By NASA, ESA, J. Hester and A. Loll (Arizona State University) - HubbleSite: gallery, release., Public domain, https://commons.wikimedia.org/w/index.php?curid=516106
1584 CE
Giordano Bruno Advocates Infinite Worlds
Italian philosopher Giordano Bruno proposes an infinite universe with countless inhabited worlds, influencing later exoplanet thought. #philosophy #cosmology
Giordano Bruno Advocates Infinite Worlds 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
1632 CE
Galileo's Dialogue Supports Copernicanism
Galileo Galilei publishes 'Dialogue Concerning the Two Chief World Systems', promoting heliocentrism and the idea of Earth as a planet. #astronomy #science
Galileo's Dialogue Supports Copernicanism By Giovanni Battista Landini - http://moro.imss.fi.it/lettura/LetturaWEB.DLL?AZIONE=IMG&TESTO=E_U&PARAM=07-23-tit.jpg and http://moro.imss.fi.it/lettura/LetturaWEB.DLL?AZIONE=IMG&TESTO=E_U&PARAM=07-25-tit.jpg Transferred from en.wikipedia to Commons by User:Lijealso using CommonsHelper., Public domain, https://commons.wikimedia.org/w/index.php?curid=5289735
1687 CE
Newton's Universal Gravitation
Isaac Newton publishes 'Principia', establishing laws of gravity that later enable exoplanet detection via radial velocity. #physics #astronomy
Newton's Universal Gravitation 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 Nebular Hypothesis
Immanuel Kant proposes that solar systems form from rotating gas clouds, a foundational concept for planetary formation. #astronomy #philosophy
Kant's Nebular Hypothesis By NASA, ESA, and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration - HubbleSite: gallery, NewsCenter, Public domain, https://commons.wikimedia.org/w/index.php?curid=1489643
1838 CE
Bessel Measures Stellar Parallax
Friedrich Bessel measures the distance to star 61 Cygni, confirming stars are distant suns and expanding the cosmic stage. #astronomy #science
Bessel Measures Stellar Parallax By Christian Albrecht Jensen - Ny Carlsberg Glyptotek, Public domain, https://commons.wikimedia.org/w/index.php?curid=11276529
1859 CE
Darwin's Origin of Species
Charles Darwin publishes 'On the Origin of Species', providing a framework for understanding life's evolution, relevant to astrobiology. #biology #evolution
Darwin's Origin of Species By John Murray, Publisher - This image has an extracted file: Origin of Species.jpg., Public domain, https://commons.wikimedia.org/w/index.php?curid=320416
1917 CE
Einstein's Cosmological Constant
Albert Einstein introduces the cosmological constant in general relativity, later relevant to exoplanet habitability and universe structure. #physics #cosmology
Einstein's Cosmological Constant By NASA/WMAP Science Team - Original version: NASA; modified by Cherkash, Public domain, https://commons.wikimedia.org/w/index.php?curid=11885244
1952 CE
Miller-Urey Experiment
Stanley Miller and Harold Urey simulate early Earth conditions, producing amino acids and demonstrating abiogenesis possibilities. #chemistry #astrobiology
Miller-Urey Experiment By GYassineMrabetTalk✉ This W3C-unspecified vector image was created with Inkscape . W3C-validity not checked. - Own work from Image:MUexperiment.png by Carny, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3500500
1961 CE
Drake Equation Formulated
Frank Drake proposes the Drake Equation to estimate the number of communicative civilizations in the Milky Way. #astronomy #seti
Drake Equation Formulated By NRAO/AUI/NSF - https://public.nrao.edu/gallery/frank-drake/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=169654646
1963 CE
First Quasar Discovered
Maarten Schmidt identifies the first quasar, 3C 273, expanding knowledge of extreme cosmic phenomena. #astronomy #quasars
First Quasar Discovered By ESO/M. Kornmesser - http://www.eso.org/public/images/eso1122a/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=15700804
Aug 20, 1977 CE
Voyager 2 Launched
NASA launches Voyager 2, later providing data on outer planets and carrying the Golden Record for potential extraterrestrial contact. #spaceexploration #nasa
Voyager 2 Launched By National Aeronautics and Space Administration (NASA) - Published source: "Spacecraft Icons" at NASA ScienceDirect source: Image hosted by smd-prod.s3.amazonaws.com., Public domain, https://commons.wikimedia.org/w/index.php?curid=66602695
Jan 9, 1992 CE
First Exoplanets Confirmed Around Pulsar
Aleksander Wolszczan and Dale Frail announce the discovery of two planets orbiting pulsar PSR B1257+12, the first confirmed exoplanets. #astronomy #exoplanets
Oct 6, 1995 CE
51 Pegasi b Discovered
Michel Mayor and Didier Queloz announce the first exoplanet orbiting a Sun-like star, 51 Pegasi b, a hot Jupiter. #astronomy #exoplanets
51 Pegasi b Discovered By ESO/M. Kornmesser/Nick Risinger (skysurvey.org) - ESO website, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=39719418
Nov 15, 1999 CE
First Transiting Exoplanet Detected
HD 209458 b becomes the first exoplanet observed transiting its star, enabling atmospheric studies. #astronomy #exoplanets
First Transiting Exoplanet Detected By Aldaron, a.k.a. Aldaron - Own work, incorporating public domain images for reference planets (see below), inspired by Thingg's size comparison, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8903868
Aug 12, 2001 CE
First Exoplanet Atmosphere Detected
Sodium absorption is detected in the atmosphere of HD 209458 b, marking the first direct detection of an exoplanet atmosphere. #astronomy #exoplanets
Jun 10, 2003 CE
Spitzer Space Telescope Launched
NASA's Spitzer Space Telescope, an infrared observatory, contributes to exoplanet atmospheric characterization. #astronomy #nasa
Spitzer Space Telescope Launched By NASA/JPL-Caltech - http://www.spitzer.caltech.edu/images/3072-SIRTF-Spitzer-Rendered-against-an-Infrared-100-Micron-Sky, Public domain, https://commons.wikimedia.org/w/index.php?curid=85585
Mar 9, 2004 CE
First Direct Image of an Exoplanet?
Possible direct image of exoplanet 2M1207b is taken by the Very Large Telescope, later confirmed. #astronomy #exoplanets
First Direct Image of an Exoplanet? By Aldaron, a.k.a. Aldaron - Own work, incorporating public domain images for reference planets (see below), inspired by Thingg's size comparison, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8902848
Jul 4, 2005 CE
Deep Impact Mission Comet Collision
NASA's Deep Impact mission collides with comet Tempel 1, studying cometary composition relevant to astrobiology. #spaceexploration #astrobiology )
Deep Impact Mission Comet Collision By NASA/JPL - http://deepimpact.jpl.nasa.gov/gallery/Flyby_w_Impactor.html, Public domain, https://commons.wikimedia.org/w/index.php?curid=155967
Mar 9, 2006 CE
Cassini Finds Water Plumes on Enceladus
Cassini spacecraft discovers water vapor plumes on Saturn's moon Enceladus, indicating subsurface ocean and potential habitability. #astronomy #astrobiology
Cassini Finds Water Plumes on Enceladus By National Aeronautics and Space Administration (NASA) / Jet Propulsion Laboratory (JPL) - PIA17202 from the NASA/JPL Photojournal, Public domain, https://commons.wikimedia.org/w/index.php?curid=44644158
Apr 24, 2007 CE
Gliese 581c Discovered
First potentially habitable exoplanet found in the habitable zone of red dwarf Gliese 581. #astronomy #exoplanets
Gliese 581c Discovered By Aldaron, a.k.a. Aldaron - Own work, incorporating public domain images for reference planets (see below), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=11703403
Mar 6, 2009 CE
Kepler Space Telescope Launched
NASA's Kepler mission begins, designed to discover Earth-size exoplanets in the habitable zone via transit method. #astronomy #nasa
Kepler Space Telescope Launched By NASA - https://science.nasa.gov/toolkits/spacecraft-icons (image link), Public domain, https://commons.wikimedia.org/w/index.php?curid=76268556
Sep 29, 2010 CE
First Exoplanet with Water Vapor
Water vapor is detected in the atmosphere of exoplanet HD 189733b using Spitzer data. #astronomy #exoplanets
First Exoplanet with Water Vapor By SevenSpheres - Own work, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=99268874
Feb 2, 2011 CE
Kepler-11 System with Six Transiting Planets
Kepler discovers a compact system of six transiting planets, Kepler-11, showcasing planetary system diversity. #astronomy #exoplanets
Kepler-11 System with Six Transiting Planets By NASA / Tim Pyle - New Planetary System image:[1], Public domain, https://commons.wikimedia.org/w/index.php?curid=12890676
Dec 5, 2012 CE
Alpha Centauri Bb Claimed
A possible Earth-mass exoplanet is announced around Alpha Centauri B, later disputed but highlighting nearby systems. #astronomy #exoplanets
Alpha Centauri Bb Claimed By ESO/L. Calçada/N. Risinger - ESO, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=23163877
Apr 18, 2013 CE
Kepler-62f: Potentially Habitable
Kepler-62f, a super-Earth in the habitable zone of a K2 star, is discovered, one of the most Earth-like exoplanets. #astronomy #exoplanets
Kepler-62f: Potentially Habitable By NASA Ames/JPL-Caltech - http://www.nasa.gov/mission_pages/kepler/news/kepler-62-kepler-69.html, Public domain, https://commons.wikimedia.org/w/index.php?curid=25666606
Feb 26, 2014 CE
Kepler-186f: First Earth-Size in Habitable Zone
Kepler-186f is the first Earth-size exoplanet discovered in the habitable zone of another star. #astronomy #exoplanets
Kepler-186f: First Earth-Size in Habitable Zone By NASA Ames/SETI Institute/JPL-Caltech - [1], [2], Public domain, https://commons.wikimedia.org/w/index.php?curid=32229517
Jul 14, 2015 CE
New Horizons Pluto Flyby
NASA's New Horizons spacecraft performs the first flyby of Pluto, revealing its complex geology and potential subsurface ocean. #spaceexploration #pluto
New Horizons Pluto Flyby By National Aeronautics and Space Administration (NASA), Applied Physics Laboratory - "PEPSSI Instrument Tastes Pluto's Atmosphere" from the Applied Physics Laboratory New Horizons website., Public domain, https://commons.wikimedia.org/w/index.php?curid=41340864
Aug 24, 2016 CE
Proxima Centauri b Announced
An Earth-mass exoplanet is discovered in the habitable zone of Proxima Centauri, the closest star to the Sun. #astronomy #exoplanets
Proxima Centauri b Announced By ESO/M. Kornmesser - https://www.eso.org/public/images/ann16056a/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=50869082
Feb 22, 2017 CE
TRAPPIST-1 System Announced
NASA announces the TRAPPIST-1 system with seven Earth-sized planets, three in the habitable zone, a major milestone. #astronomy #exoplanets
TRAPPIST-1 System Announced By Processing and color compositing by Nrco0e; original images by Sloan Digital Sky Survey - Own work; processed from images acquired from the SDSS DR17 archive, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=191888700
Apr 18, 2018 CE
TESS Launched
NASA's Transiting Exoplanet Survey Satellite (TESS) launches to survey bright stars for exoplanets. #astronomy #nasa
TESS Launched By Orbital ATK / NASA - https://svs.gsfc.nasa.gov/vis/a010000/a012700/a012782/TESS_alone_high_res.jpg https://svs.gsfc.nasa.gov/12782, Public domain, https://commons.wikimedia.org/w/index.php?curid=108981705
Oct 8, 2019 CE
Nobel Prize for Exoplanet Discovery
Michel Mayor and Didier Queloz win the Nobel Prize in Physics for the discovery of 51 Pegasi b. #astronomy #nobel
Sep 14, 2020 CE
Phosphine in Venus's Atmosphere
Possible biosignature phosphine is detected in Venus's atmosphere, sparking debate about life in the clouds. #astronomy #astrobiology
Phosphine in Venus's Atmosphere By Д.Ильин: vectorization - File:Phosphine.png by Benjah-bmm27, Public domain, https://commons.wikimedia.org/w/index.php?curid=169214561
Dec 25, 2021 CE
James Webb Space Telescope Launched
NASA's JWST launches, capable of characterizing exoplanet atmospheres in unprecedented detail. #astronomy #nasa
James Webb Space Telescope Launched 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
JWST releases its first full-color images, including spectra of exoplanet WASP-96b, revealing water vapor. #astronomy #jwst
Jan 11, 2023 CE
JWST Detects CO2 on Exoplanet
JWST detects carbon dioxide in the atmosphere of exoplanet WASP-39b, demonstrating its capability for biosignature searches. #astronomy #exoplanets
JWST Detects CO2 on Exoplanet By NASA, ESA, CSA, J. Olmsted (STScI) - Illustration (Artist’s Impression) of WASP-39 b and Its Star, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=125907007
Sep 11, 2023 CE
Possible Exomoon Detection
A candidate exomoon around Kepler-1708b is reported, though unconfirmed, highlighting moon detection efforts. #astronomy #exomoons
Possible Exomoon Detection By NASA, ESA - https://www.spacetelescope.org/images/heic1817a/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=73369715
May 10, 2024 CE
JWST Finds Methane on Exoplanet
JWST detects methane in the atmosphere of exoplanet WASP-80b, a potential biosignature. #astronomy #exoplanets
