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1·Deimos is about 7.5 miles in diameter.

火卫二直径约7.5英里。

2·Deimos and Phobos may be due to disturbance of asteroids and Jupiter's role was to make them around Mars movement.

火卫二和火卫一可能是由于小行星的扰动与木星的作用才使它们围着火星运动的。

3·Deimos has a smooth surface due to a blanket of fragmental rock or regolith, except for the most recent impact craters.

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。