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Nobody knows when this happened, but lets say it started happening on Jan. 2nd. 2000. The Solar System was in its first stages. Earth had a planet named Theia and it was about hte size of Mars. But that was all about to change.
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Let's say it took a month for Theia to crash into Earth. The crash ejected a ring of dust into space.
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It took nearly a week for all the dust to form the moon.
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After thousands of years, the Earth and The Moon formed into what they are today. And that's how the moon was formed.