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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Lost Worlds: Why do we have a moon? | Unexplainable podcast - Listen or read transcript on Metacast
