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I'm almost positive that it is his discovering that the planets move in elipses (or ovals) rather than circles that he is most famous for, which Copernicus thought that they moved in circles when he came discovered that the sun was the center of our universe (A.K.A. the Heliocentric Universe).

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13y ago
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14y ago

http://en.wikipedia.org/wiki/Galileo_Galilei

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15y ago

the telescope!

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11y ago

my but

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Q: What was Galileo's most important contribution to astronomy?
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