At the end of the Apollo 15 moonwalk, Commander David Scott performed a live video demonstration with a geologic hammer and a feather dropped simultaneously. Because the Moon has no atmosphere (essentially vacuum), there is no air resistance and therefore both objects fall at exactly the same rate. This validated Galileo’s claims that objects released together fall at the same rate regardless of mass.
Source: http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html (NASA)
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