Tumble returns for Season 5 on October 4, with all new episodes!

In the meantime, enjoy one of our favorite-ever episodes.

What would happen if our Moon suddenly disappeared? Would we still have tides? It turns out that the Moon has a much bigger influence on Earth than you might think. Without the Moon, life as we know it would not exist! Rocket scientist Miquel Sureda explains what happened before the Moon existed, and how we know that the Moon is slowly moving away from us.

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