4) Scott’s Moon Test
Image VIA
When David Scott was chilling out on the moon as part of the Apollo 15 mission he put old Galileo to the test. On earth, if you drop a feather and a hammer at the same time the feather hits the ground later because of all the air getting in the way of the feather. But, on the moon, where there’s no atmosphere to hold anyone up, a feather drops at exactly the same speed as a hammer, thanks to gravity:
