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He believed that the Earth was the center of the Universe.
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measured the universe
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Made the theory of the earth was the center of the universe
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well for making Heliocentrism which is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System
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discovered gravity which helps explain the earths form
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invented the Kepler Telescope to help discover rotation of planets
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invented the equation E=mc2 to explain the universe