How humanity discovered the universe
From Babylonian sky-watchers and the Almagest to gravitational waves and the first image of a black hole — the people, discoveries, publications, and ideas that built our understanding of the cosmos.
47 astronomers · 22 discoveries · 11 publications · 14 eras · the full timeline →
Eras & traditions
- 3000 BCE – 500 BCE
Ancient Astronomy
- 1800 BCE – 100 BCE
Babylonian Astronomy
- 3000 BCE – 300 BCE
Egyptian Astronomy
- 600 BCE – 400 CE
Greek Astronomy
- 100 BCE – 400 CE
Roman Astronomy
- 800 CE – 1500 CE
Islamic Golden Age Astronomy
- 1300 BCE – 1600 CE
Chinese Astronomy
- 500 BCE – 1500 CE
Indian Astronomy
- 250 CE – 900 CE
Mayan Astronomy
- 1450 CE – 1600 CE
Renaissance Astronomy
- 1543 CE – 1700 CE
The Scientific Revolution
- 1800 CE – 1955 CE
Modern Astronomy
- 1957 CE – 2000 CE
Space Age Astronomy
- 2000 CE – present
Contemporary Astronomy
Featured astronomers
Astronomers A–Z →- Astronomer
Galileo Galilei
1564 CE – 1642 CE
- Astronomer
Johannes Kepler
1571 CE – 1630 CE
- Astronomer
Isaac Newton
1643 CE – 1727 CE
- Astronomer
Nicolaus Copernicus
1473 CE – 1543 CE
- Astronomer
Edwin Hubble
1889 CE – 1953 CE
- Astronomer
Vera Rubin
1928 CE – 2016 CE
- Astronomer
Subrahmanyan Chandrasekhar
1910 CE – 1995 CE
- Astronomer
Jocelyn Bell Burnell
1943 CE – present
- Astronomer
Carl Sagan
1934 CE – 1996 CE
- Astronomer
Andrea Ghez
1965 CE – present
- Astronomer
Michel Mayor
1942 CE – present
- Astronomer
Al-Sufi
903 CE – 986 CE
Explore the history
Ancient Astronomy
The earliest astronomy — from Babylon, Egypt, Greece, China, India, and the Maya.
Greek Astronomy
The Greco-Roman thinkers who made astronomy a geometric science.
Islamic Golden Age Astronomy
The astronomers who preserved and transformed the science across the medieval Islamic world.
Renaissance Astronomy
Copernicus, Tycho, and the reopening of the cosmos to bold reform.
Modern Astronomy
Spectroscopy, photography, and the discovery of galaxies and the expanding universe.
Women in Astronomy
Astronomers whose work reshaped our understanding of the universe.
Astronomers A–Z
Every astronomer in the encyclopedia, alphabetically.
Scientific Discoveries
The great discoveries in the history of astronomy, in chronological order.
Historic Publications
The landmark books and treatises that changed astronomy.
History of Telescopes
From the first spyglass to space observatories.
History of Observatories
The great observatories, from Maragha and Samarkand to Greenwich and Paranal.
History of Space Exploration
Discoveries of the space age, when astronomy left the atmosphere behind.
History of Cosmology
How we came to understand the origin, expansion, and contents of the universe.
History of Exoplanets
The discovery of worlds beyond the Solar System.
History of Black Holes
From a theoretical prediction to the first image of a black hole.
Nobel Prize Laureates in Astronomy
Astronomers in this encyclopedia honoured with the Nobel Prize in Physics.
Timeline
Full timeline →- c. 130 BCEPrecession of the Equinoxes
- c. 150 CEAlmagest
- 499 CEAryabhatiya
- 964 CEBook of Fixed Stars
- 1543 CEDe revolutionibus orbium coelestium
- 1608 CEThe Invention of the Telescope
- 1609 CEAstronomia nova
- 1610 CEThe Galilean Moons of Jupiter
- 1610 CEThe Phases of Venus
- 1610 CESidereus Nuncius
- 1619 CEHarmonices Mundi
- 1632 CEDialogue Concerning the Two Chief World Systems
- 1655 CEThe Discovery of Titan
- 1659 CEThe Nature of Saturn's Rings
- 1675 CEFounding of the Royal Observatory, Greenwich
- 1687 CEPhilosophiæ Naturalis Principia Mathematica
- 1705 CEThe Periodicity of Halley's Comet
- 1781 CEThe Discovery of Uranus
- 1846 CEThe Prediction and Discovery of Neptune
- 1912 CEThe Cepheid Period–Luminosity Relation
- 1919 CEFounding of the International Astronomical Union
- 1920 CEThe Great Debate
- 1925 CEWhat Stars Are Made Of
- 1929 CEThe Expansion of the Universe
- 1933 CEEvidence for Dark Matter
- 1963 CEThe Discovery of Quasars
- 1965 CEThe Cosmic Microwave Background
- 1967 CEThe Discovery of Pulsars
- 1980 CECosmos
- 1988 CEA Brief History of Time
- 1992 CEThe First Kuiper Belt Object
- 1995 CEThe First Exoplanet Around a Sun-like Star
- 1998 CEThe Accelerating Universe
- 2015 CEThe First Detection of Gravitational Waves
- 2019 CEThe First Image of a Black Hole
- c. 2020 CEThe Milky Way's Central Black Hole
- 2022 CEJWST's First Science Images
Sources & provenance
Every biography, date, discovery, publication, and award is drawn from authoritative reference sources — the IAU, NASA, ESA, ESO, NASA ADS, the Nobel Foundation, and Encyclopaedia Britannica. Nothing is fabricated; astronomers already in the knowledge graph are reused, not duplicated. See the source quality page.