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Radiolab

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The Moon Is a Rock, and the Moon Is Just Another Rock

Newton saw the moon as a regular lumpy, potato-ish rock. He thought that if it's just another rock, why doesn't it fall down? Galileo had come up with a riddle to answer this question. It involves two bullets being shot at each other from opposite sides of a field. Both will hit the ground eventually, but when they do, they'll be far apart.

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