•What defines a planet? Who makes these decisions?


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Planet Planet:1:(astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction; 2:a person who follows or serves another; 3:any celestial body (other than comets or satellites) that revolves around a star.

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