造访火星的神秘小卫星：火卫一的身世之谜
Mars has two small moons, and the larger one, Phobos, has puzzled scientists for decades. It is not a smooth, round world like our own Moon. Instead, it looks like a lumpy, gray potato, scarred with craters and strange grooves that run across its surface like scratches.
The biggest mystery is simple to ask but hard to answer: where did Phobos come from? Some researchers think it is an asteroid that wandered too close to Mars and was captured by the planet's gravity. Others believe it formed from a cloud of dust and rock thrown up when something huge once smashed into Mars.
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