: Astronomie: Theia

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Theia

Theia is a hypothesized ancient planet in the early Solar System that, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris gathering to form the Moon. In addition to explaining Earth's large satellite, the Theia hypothesis can also explain why Earth's core is larger than expected for a body its size; Theia's core and mantle fused with Earth's core and mantle. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Theia_(planet))

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