Gravity does a number on your body. But in space with zero gravity, your body changes and reacts differently than it does on Earth. So what happens to your body in Space? As astronaut Leland Melvin tells it, you actually gain an inch of height! Also, your heart gets a little bit smaller while changing shape, your bones become brittle, and your eyesight gets all funky. But it’s all absolutely worth it because like, space.