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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According to the giant-impact hypothesis, the Moon was created during a collision between Earth and a large object about the size of Mars.

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。

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This observation from NASA's Mars Reconnaissance Orbiter shows the floor of a large impact crater in the southern highlands, north of the giant Hellas impact basin.

这幅来自NASA火星轨道观察器的图像显示了位于火星南方高地巨大的Hellas撞击盆地北侧地表上的一个大撞击坑。

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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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