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Apollo 15 astronaut drops a hammer and a feather on the moon simultaneously to demonstrate that in a vacuum all objects released together fall at the same rate.
At the end of the last Apollo 15 moon walk, Commander David Scott
performed a live demonstration. He held out a geologic
hammer and a feather and dropped them at the same time. Because they were
in a vacuum, there was no air resistance and the feather fell at the same rate
as the hammer, as Galileo had concluded hundreds of years before - all objects released
together fall at the same rate regardless of mass.
NASA
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