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"Planet" means "wanderer"--a reference that contrasts planets from stars. If you look at the sky, planets can change position relative to the other stars in the sky. Stars tend to be grouped in a fixed pattern.

In modern terms, a planet is an object orbiting a star that is massive enough to be rounded by its own gravity, but not massive enough to cause fusion, and has cleared its neighbouring region of planetesimals.

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9y ago

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