描述: 撞击坑是太阳系中行星、卫星或其他固体小天体表面的凹陷。撞击坑是由较小的天体（陨石）高速撞击形成的。由于缺乏大气层，月球上布满了​​撞击坑。地球上厚厚的大气层阻止了许多流星到达地面。美国亚利桑那州的流星坑就是地球上撞击坑的一个例子。

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