What became of the remnants of the protoplanet Theia after the collision?
Answer
It was pulverized and mixed into the Earths mantle
Due to the extreme energy involved in the collision, Theia did not remain intact as a distinct object. Instead, the force and heat of the impact pulverized and vaporized the protoplanet. Much of this material was blended with the Earth's own mantle material, meaning a significant portion of our planet's lower mantle may consist of the remnants of Theia. We effectively inhabit a world that absorbed the object responsible for creating its satellite.
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