Why do we have a moon?
Unexplainable
00:00
The Lost World of Thea
Writer Rebecca Boyle has been fascinated by this missing planet, the lost world of Thea. One idea is that the giant impact was much more epic than we ever could have imagined. Instead of Thea glancing off, forming the moon and leaving the Earth devastated but largely intact, a new theory says both worlds melted together.
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