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词汇 Planetary satellite
分类 英语词汇 英语翻译词典
释义

Planetary satellite

中文百科

卫星 Natural satellite

(重定向自Planetary satellite)
太阳系部份卫星较诸地球大小图

卫星,是环绕一颗行星按闭合轨道做周期性运行的天体。如地球的卫星是月球。不过,如果两个天体的质量相当,它们所形成的系统一般称为双行星系统,而不是一颗行星和一颗天然卫星。通常,两个天体的质量中心都处于行星之内。因此,有天文学家认为冥王星与冥卫一应该归类为双行星,但2005年发现两颗新的冥卫,使问题复杂起来了。

英语百科

Natural satellite 卫星

(重定向自Planetary satellite)
Nineteen natural satellites are large enough to be round, and one, Saturn's moon, Titan, has a substantial atmosphere.
Two moons: Saturn's natural satellite Dione occults Enceladus
Artist impression of Rhea's proposed rings
The relative masses of the natural satellites of the Solar System. Mimas, Enceladus, and Miranda are too small to be visible at this scale. All the irregularly shaped natural satellites, even added together, would also be too small to be visible.

A natural satellite, or moon is a celestial body that orbits another celestial body of greater mass (e.g. a planet, star, or dwarf planet), called its primary. For example, the Moon is a natural satellite of Earth, and Earth is a natural satellite of the Sun.

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