People of the Atlas
The observers, mathematicians and dreamers who turned the sky into science, from a librarian measuring the Earth with shadows to the team that photographed a black hole.
Where it begins · 1473–1543
Nicolaus Copernicus
Putting the Sun, not Earth, at the center of the Solar System
A Polish church official who spent decades quietly working out that the sky's motions make far more sense if Earth orbits the Sun while spinning daily. Fearing ridicule, he published On the Revolutions of the…
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Tycho Brahe
The last, greatest naked-eye observer, whose data broke the crystal spheres
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Galileo Galilei
First telescopic observations; evidence for the Sun-centered system
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Johannes Kepler
The three laws of planetary motion
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Christiaan Huygens
Saturn's rings, Titan, the pendulum clock, and wave optics
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Isaac Newton
Universal gravitation, the laws of motion, and the reflecting telescope
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William & Caroline Herschel
Discovering Uranus; founding deep-sky astronomy
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Annie Jump Cannon
Classifying the stars into O B A F G K M
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Henrietta Swan Leavitt
Astronomy's distance ruler, the Cepheid period–luminosity law
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Albert Einstein
Relativity, the modern theory of space, time and gravity
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Arthur Eddington
Proving Einstein right and explaining how stars shine
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Edwin Hubble
Proving other galaxies exist and that the universe expands
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Georges Lemaitre
The priest who out-calculated the skeptics and fathered the Big Bang
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Fritz Zwicky
Dark matter, supernovae, and neutron stars, all decades too early
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Cecilia Payne-Gaposchkin
Discovering what stars are made of
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Karl Jansky & Grote Reber
Accidentally discovering the radio universe
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Subrahmanyan Chandrasekhar
The mass limit that makes black holes inevitable
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Katherine Johnson
The orbital calculations behind America's first human spaceflights
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Nancy Grace Roman
The 'Mother of Hubble' and architect of astronomy from space
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Vera Rubin
Establishing the evidence for dark matter
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Frank Drake
The first search for extraterrestrial signals, and the equation that framed the question
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Carl Sagan
Bringing the universe to everyone
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Stephen Hawking
Black-hole radiation and singularity theorems
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Jocelyn Bell Burnell
Discovering pulsars
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Reinhard Genzel
Three decades of precision at the galactic center
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Andrea Ghez
Tracking stars around the Milky Way's black hole
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Aryabhata
India's astronomical revolution, from a rotating Earth to eclipse science
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Abd al-Rahman al-Sufi
The Book of Fixed Stars, and the first recorded galaxy
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Claudius Ptolemy
The Almagest and its Earth-centered system, which ruled for 1,400 years
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Hipparchus
Antiquity's greatest observer, remembered for star catalogs, magnitudes, and precession
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Eratosthenes
Measuring the Earth's size with shadows and geometry
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Portraits from Wikimedia Commons under free licences; each person’s page credits its own image.