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1501
Copernicus develops the Heliocentric Theory
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1572
Tyco Brahe discovers supernovas
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Kepler proposes the three laws of planetary motion
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Isaac Newton develops the theory of gravity
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Pierre-simon Laplace applies Newton's theory of gravity to the entire solar system
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William Herschel discovers Uranus and develops the theory of stellar evolution
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Percival Lowell predicts the existence of Pluto and begins looking for it
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Albert Einstein develops the theory of relativity
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Henrietta Leavitt develops the period-luminosity theory
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Willem de Sitter makes a model of the universe using Eintein's theory of relativity
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Harlow Shapley determines the overall shape of our universe and the position of our solar system
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Georges Lemaitre proposes the Big Bang theory
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Edwin Hubble proves our universe is expanding and the existence of other galaxies
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Fred Hoyle publishes his book that proves the stellar nucleosynthesis theory
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Arno Penzias and Robert Wilson discover Cosmic Background Radiation (CBR)