Daily Curiosities: A Hammer and a Feather Will Hit the Ground at the Same Time…
POSTED by: on 10/09/2009
…On the Moon. At the end of the Apollo 15 mission, immediately prior to returning to their spacecraft, astronauts David Scott and James Irwin performed a short experiment to prove that Galileo Galilei was correct in his theory that objects in a vacuum fall at the same rate regardless of their mass.
The experiment involved dropping a geology hammer and a falcon feather at the same time and seeing which one hit the surface first. On earth the hammer will always hit the ground first, but on the moon, where the atmosphere is all but nonexistent, both hit the ground at the same time. The actual cause for the disparity on earth is air resistance, not a difference in mass. Linked is a video of the experiment taken from the surface of the moon.
More Info