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What is the leading scientific theory for the Moon's formation?

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Correct answer: A giant impact with a Mars-sized body

The most widely accepted theory, known as the Giant Impact Hypothesis, suggests that the Moon formed from the debris ejected into orbit after a colossal collision between early Earth and a Mars-sized protoplanet named Theia. This event is estimated to have occurred about 4.5 billion years ago, just after the Solar System's formation. Photo: NASA/JPL-Caltech, Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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