Rock on a planet is also important.

行星上的岩石也很重要。

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The movie tells the story of humans meeting tall blue creatures called Na'vi on a planet called Pandora.

VOA: special.2010.03.01

Spock is described as not having emotions because he's half Vulcan, from a planet where they lack emotions.

斯帕克没有情感,因为他有半个火神的血统，他来自缺少情感的星球。

耶鲁公开课 - 心理学导论课程节选

Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?

水银是液态金属，水银，行星，是肉眼能看到的运动最快的天体,火星，铁，为什么火星是红色的？

麻省理工公开课 - 固态化学导论课程节选

Whatever the answer, a planet once strikingly similar to ours has become a thoroughly alien place.

NEWYORKER: The Martian Chroniclers

Unidentified Man: Is Neptune a planet, because everybody knows that Neptune's orbit is crossed by Pluto's.

NPR: Pluto, the Un-Planet?

We really don't know what sort of composition a planet the size of Kepler-22b would have.

BBC: Viewpoint: The obsession with a 'twin Earth'