(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
a person who follows or serves another
any celestial body (other than comets or satellites) that revolves around a star
planets的用法和樣例：
例句
The sun and the planets are heavenly bodies. 太陽和行星都是天體。
Life on other planets is a possibility. 其他行星上有生命是可能的。
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