Which Apollo 15 astronaut dropped a hammer and a feather on the Moon to demonstrate Galileo's theory of gravity?
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Commander David Scott performed this famous live-television demonstration in 1971 using a heavy geology hammer and a falcon feather. Because the Moon has virtually no atmosphere to create air resistance, both objects hit the lunar dust at the exact same moment. This beautifully confirmed Galileo's 17th-century hypothesis that all objects fall at the same rate in a vacuum. Photo: NASA, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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