火卫二直径约7.5英里。
这也增加了土卫二内部存在生命的可能性。
That would also increase the likelihood life could be present in the interior as well.
火卫二因碎屑岩或风华层的覆盖而表面光滑，除了最近的撞击坑。
Deimos has a smooth surface due to a blanket of fragmental rock or regolith, except for the most recent impact craters.
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