火卫二直径约7.5英里。
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.
“火卫一步兵”探测器预计在今年晚些时候登陆火卫一，并于2014年取回地表样本。
The Russian Phobos-Grunt robotic spacecraft is scheduled to launch toward Phobos later this year and return surface samples in 2014.
应用推荐