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Wed, 14 Apr 2021 19:02 UTC © Jurik Peter/ShutterstockResearchers are fairly certain that we gained our favorite satellite, the Moon, after a planet, Theia, collided with the proto-Earth 4.5 billion years ago. What s not certain are the details surrounding Theia s fate. Was it a hit-and-run, or did the mantles of the two planets merge? suggesting that Theia not only merged with Earth, but we might know right where the remnants of its mantle reside in Earth. Giant impact hypothesis Compared to the Moon, there is much less [known] about Theia, says Yuan. The Moon is there. You have samples. People have been there . few people care too much about the impactor.

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