One problem with the collision hypothesis is the question of how a satellite formed in this way could have settled into the nearly circular orbit that the Moon has today.
碰撞假说的一个问题是，以这种方式形成的卫星是如何在月球现在的近乎圆形的轨道上运行的。
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The problem: Most satellite instruments can't distinguish particles close to the ground from those high in the atmosphere.
问题就在于：大多数卫星仪器无法将那些浮于地表的和悬于大气层中的细颗粒物区分清楚。
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In fact, identifying such a small area would normally be impossible for a satellite, but NASA scientists are a smart bunch and they've overcome this problem.