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。
Thanks to the nasa innovative advanced concepts ( niac ) program , pavone is eying a new paradigm to explore comets and asteroids , as well as the small moons of mars : phobos and deimos .