The earth is tilted on its axis 23 and a half degrees. The moon's mass and momentum as it orbits the earth plays a big role in keeping that tilt steady. And to see why, just look over at mars. Thi stability is crucial.
In all our searching of the universe, we’ve never seen another moon like ours. It's big, it's weird, it's played a huge role in shaping our planet. But how did we get it? Every possible story points to cataclysm.
This is the second episode of our new four-part series, Lost Worlds.
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