This family of planets, with their moons, is known as the solar system.

这个行星家庭以及它们的卫星，就是我们所知道的太阳系。

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The orbits comets take sometimes end with them colliding with planets and their moons.

一些在轨彗星有时会以与行星或其卫星发生碰撞的形式走向终结。

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Do we have an ethical duty to respect and preserve the natural environments of neighboring planets and their moons?

我们有一个道德义务，尊重并维护邻近行星及其卫星的自然环境吗？

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The pictures transmitted by the Voyagers showed the two giant planets, and their assorted moons and rings, in unprecedented detail.

ECONOMIST: The long arm of the celestial repairman

Belinda and Umbriel, two of Uranus's larger moons, take their names from a poem by Alexander Pope.

ECONOMIST: Today we have naming of parts

Moons that orbit their planet too closely will experience strong tidal heating and a runaway greenhouse effect that would boil away any surface water.

MSN: News editor