Thea was probably the size of Mars, a little smaller than Earth. Gravity would have brought them together and they hit head-on. The core of this planet that was destroyed. These skeletal remains of Thea burned magma hot,. then cooled into our bright, white moon.
In all our searching of the universe, we’ve never seen another moon like ours. It's big, it's weird, and it has played a huge role in shaping our planet. But how did we get it? Every possible story points to cataclysm.
This episode originally ran on June 15, 2022. It is part of our Lost Worlds series exploring scientific mysteries buried in the deep past.
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