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Predicted the motion of planets better than any other theory at the time
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Thought the sun and moon followed around Earth and other planets followed around the sun, although it was incorrect, his observation helped future astronomers.
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Determined that the planets revolve around the sun in an oval shaped orbit.
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Made a telescope so he can see planets with more than a naked eye.
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Showed that the universe attracts each other by using force called gravity
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Proved that the universe exisisted beyond our galaxy.
