The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space.

水手号宇宙飞船发现火星表面，还有它的两个卫星表面，都有由太空坠落的流星体造成的陨石坑。

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While Venus and Mercury have no moons, Mars has two, while Saturn and Jupiter have more than 60 each.

尽管金星和水星没有卫星，火星却有两个卫星，更别提各有超过60个卫星的土星和木星。

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The moon, Mars, Venus, two asteroids and even one of the moons of Saturn have all received the attentions of landing craft.

月球、火星、金星、两个小行星、甚至连土星的卫星之一都已接受过登陆飞船的光顾。

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It's what we'd use to go to, eventually,to Mars or to the moons of Mars."

VOA: special.2009.12.30

The first observations were made of Deimos, the smaller of Mars' two moons.

CNN: Mars' geology 'more like Earth than the moon'

The probe was built to land on the larger of Mars' two moons, Phobos, and scoop up rock to bring back to Earth.

BBC: Signal picked up from Russia's stranded Mars probe

With its superior lift capability, the SLS will expand our reach in the solar system and allow us to explore cis-lunar space, near-Earth asteroids, Mars and its moons and beyond.

ENGADGET: NASA's Space Launch System to rocket into deep space, unravel the universe's mysteries (video)