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How many of Earth's moons crashed back into the planet?

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https://www.universetoday.com/139170/how...he-planet/

EXCERPT: . . . the most widely accepted theory is that the Moon formed roughly 4.5 billion years ago when a Mars-sized object (named Theia) collided with a proto-Earth (aka. the Giant Impact Hypothesis).However, since the proto-Earth experienced many giant-impacts, several moons are expected to have formed in orbit around it over time. The question thus arises, what happened to these moons? Raising this very question, a team an international team of scientist conducted a study in which they suggest that these “moonlets” could have eventually crashed back into Earth, leaving only the one we see today...

MORE: https://www.universetoday.com/139170/how...he-planet/
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