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He found the circumference of the earth
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He combined the movement of the stars with mathematics to predict movements of the planets. He also thought the earth was the center of the universe.
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his heliocentric system put the sun in the center of the solar system where it should be.
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He thought that the earth was at the center of universe
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made the kepler laws
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he created newtons laws
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He said that laws of physics were the same throughout the universe.