What If We Dug a Tunnel Through the Center of the Earth?

Imagine you're in a super fast elevator that goes all the way through the Earth. When you jump in, gravity pulls you down like when you fall off a swing, but once you get to the other side, gravity starts pulling you back the other way! It’s like a giant bouncy ball ride inside the planet. You’d zoom from one end of the tunnel to the other and keep bouncing forever if there was no air or friction.

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Examples

  1. You're like a ball bouncing between two walls on either side of the Earth
  2. It's like being in an elevator that goes all the way to the other side of the planet
  3. If there were no air, you would pop out the other side and keep going back and forth

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