Lost Worlds: Why do we have a moon?

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. For more, go to http://vox.com/unexplainable It’s a
great place to view show transcripts and read more about the topics
on our show. Also, email us! unexplainable@vox.com We read every
email. Support Unexplainable by making a financial contribution to
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