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Nicolaus Copernicus
-Sun is the center of the solar system -
Galileo Galilei
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Galileo Galilei
-Based on density, not weight -
Galileo Galilei
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Galileo Galilei
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Ismael Bullialdus
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Isaac Newton
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Henry Cavendish
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Urbain Le Verrier and John Couch Adams
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Ernst Mach
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Henri Poincaré
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Albert Einstein
E=mc^2 -
Albert Einstein
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Albert Einstein
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John Wheeler
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IAU
-Decided Pluto does not fit requirements of a planet