So when a 10-kilometer diameter asteroid enters through the atmosphere and impacts the surface of the earth, you have to realize that 10-kilometer object is comparable to the size, the height scale of the atmosphere itself.

当一颗直径10千米的小行星，进入大气层，并且撞击到地球表面时，你得知道那个10千米的物体在尺寸上基本与大气层本身的高度相当。