根据“巨型撞击假说”，月球是在地球和一个火星大小的物体相撞时形成的。
According to the giant-impact hypothesis, the Moon was created during a collision between Earth and a large object about the size of Mars.
一个起源假说是当撞击发生时，此处并没有被水星表面的物质所覆盖保护著。
One origin hypothesis is that the dark material was uncovered from beneath Mercury's surface during the impact that created the surrounding crater.
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