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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