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He said that the earth was not the center of the solar system, and that is was the sun. The catholic church did not believe this which led them to killing him.
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He made his journey around the entire globe. This challenged previous notion that the earth was flat.
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He proposed being able to use decimals in math.
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He created his his first reflecting telescope. It included a concave mirror.
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Says that there are particles in the air that we need to live and are also needed for combustion.
