The prevailing hypothesis is that the moon was formed from a giant impact event, when a Mars-sized object slammed into Earth.

主流的理论假设认为，月球是大爆炸时期一火星大小的物体猛烈撞击地球而形成的。

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Before our research, we thought the Earth and moon had the same volatiles after the Giant Impact, just at greatly different quantities.

泰勒说，“在我们研究之前， 我们原来认为地球和月球在巨大冲击后有着同样的挥发物质，只是在数量上有很多区别。

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"If the whole moon has the amount of water equivalent to what we analysed, then the giant impact theory is in a little trouble, " says Saal.

如果整个月球的水含量都与我们的测量结果相近，那么月球大碰撞说会有些小麻烦。

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This supports models where the moon is derived from Earth materials that were ejected during a giant impact event early in solar system history.

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The giant impact hypothesis was first posited in the 1970s.

BBC: Moon formation: New spins put on old questions