Explaining The Universe on Instagram: "The classic bowling ball vs. feathers experiment shows how gravity works when air resistance is removed. On Earth, a feather normally falls slowly because air pushes against it while a heavy ball drops quickly. But in a giant vacuum chamber — like the famous demonstration done by physicist Brian Cox — all the air is pumped out so nothing can slow the objects down. When released together, the bowling ball and feathers fall at exactly the same rate and hit th