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The Giant Impact Hypothesis is probably the most favoured today. This has it that a body about as massive as Mars, (Now called Theia) had accumulated in the Lagrange points, and about 4.5 billion years ago, this made a low velocity collision with the early Earth. It is thought that most of the nickel-iron of the Moon descended into the core of the Earth.

Computer models concur with this hypothesis, and further support is obtained from samples collected from the Moon itself.

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Q: How long has the moon been in space for?
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