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B1 中级 英语 3:06 Educational

Moon 101 | National Geographic

National Geographic · 6,178,024 次观看 · 添加于 2 个月前

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- [Narrator] Over 150 moons orbit

00:06

the solar system's planets.

00:09

And one of those moons calls Earth home.

00:16

The moon was formed about 4.5 billion years ago when,

00:21

according to one theory, the Earth slammed

00:23

into another early planet.

00:27

Debris from this collision began to orbit Earth,

00:29

and accumulated, forming today's moon.

00:33

The moon is the fifth largest natural

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