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Sun-Centric Model
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Discovered elliptical orbits
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Made astronomical instruments and fixed the positioning of stars
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Theory of universal gravity
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Applied Sir Isaac Newton’s theory of gravitation to the solar system
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Discovered a planet and moons
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Estimated the size of the milky way and sun
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Discovered Pluto and Mars
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Period-luminosity relationship for Cepheid variables
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Special and general theories of relativity
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Galaxies exist beyond the milky way
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Developed theoretical models of the universe
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Discovered the Big Bang Theory
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Formulated the theory of stellar nucleosynthesis
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Discovered cosmic microwave background radiation