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1543
Nicolaus Copernicus
Published "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Heavenly Spheres) -
Nov 11, 1572
Tyco Brahe
Observed a light brighter than Venus in the night sky. -
Johannes Kepler
Published "Astronomia Nova" (New Astronomy) -
Isaac Newton
Published "Philosophiæ Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy) -
Pierre-Simon Laplace
Presented his discovery of the invairability of planetary mean motions to the Académie des sciences. -
William Herschel
Identified Uranus as the seventh planet in our solar system -
Albert Einstein
Published paper "Zur Elektrodynamik bewegter Körper" (On the Electrodynamics of Moving Bodies) on special and relativity theory -
Percival Lowell
Discovered Martian canals and asteroids -
Henrietta Leavitt
In some stars the cycle of luminosity is regular and is determined by the actual luminosity of the star. -
Harlow Shapley
Concluded our galaxy is 300 000 light years wide, and 30 000 light years thick. -
Edwin Hubble
Discovered the existence of other galaxies -
Georges Lemaître
Published paper "The Primeval Atom: An Essay on Cosmogony" -
Willem de Sitter
Co-Published with Einstein the Einstein-de Sitter model of the universe -
Fred Hoyle
Nucleosynthesis, creation of new atomic nuclei, in stars established -
Arno Penzias and Robert Wilson
Discovered cosmic microwave background radiation