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Moon 101 | National Geographic
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- [Narrator] Over 150 moons orbit
the solar system's planets.
And one of those moons calls Earth home.
The moon was formed about 4.5 billion years ago when,
according to one theory, the Earth slammed
into another early planet.
Debris from this collision began to orbit Earth,
and accumulated, forming today's moon.
The moon is the fifth largest natural
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