譬如彗星流星此类瞬时变化的现象就只能被认作发生在月球之下的大气现象。

Transient changeable phenomena like comets and meteors could be dealt with simply by assuming that they were atmospheric phenomena, taking place below the sphere of the Moon.

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我们认为，撞击月球的流星或经过的彗星尾巴可能会留下一些水分子。

We think meteors that crashed into the moon or tails of passing comets may have introduced water molecules.

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那么讲到流星体从何而来，我们就需要讨论下彗星和小行星。

So to talk about where meteorites come from, we need to talk about comets and asteroids.

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