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Is time travel possible?

Brains On! Science podcast for kids

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Time Travel Backwards Into the Past

The more gravity something has, the slower time goes. So if you could somehow go hang out on a super large planet and stayed there for a few years then came back to earth, you would have aged less than everyone else. The catch with both is that it's a one way ticket. You can travel into the future, but you can never go back. That suddenly seems less exciting.

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