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並前往https://www.khanacademy.org/humanities/big-history-project/solar-system-and-earth/earth-and-form-solar-system/a/how-our-solar-system-formed

How Our Solar System Formed (article) | Khan Academy

The Solar System that we live in consists of a medium-size star (the Sun) with eight planets orbiting it. The planets are of two different types.

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