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Published "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Heavenly Spheres)
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Observed a light brighter than Venus in the night sky.
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Published "Astronomia Nova" (New Astronomy)
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Published "Philosophiæ Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy)
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Presented his discovery of the invairability of planetary mean motions to the Académie des sciences.
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Identified Uranus as the seventh planet in our solar system
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Published paper "Zur Elektrodynamik bewegter Körper" (On the Electrodynamics of Moving Bodies) on special and relativity theory
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Discovered Martian canals and asteroids
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In some stars the cycle of luminosity is regular and is determined by the actual luminosity of the star.
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Concluded our galaxy is 300 000 light years wide, and 30 000 light years thick.
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Discovered the existence of other galaxies
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Published paper "The Primeval Atom: An Essay on Cosmogony"
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Co-Published with Einstein the Einstein-de Sitter model of the universe
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Nucleosynthesis, creation of new atomic nuclei, in stars established
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Discovered cosmic microwave background radiation