Current thinking is that some 4 billion years ago, a Mars-sized object smashed into the proto-Earth, knocking off a chunk of planet that eventually formed into the moon.
现有理论认为在大约40亿年前，一个火星大小的天体撞击了原始地球，星球被装出的部分最终形成了现在的月球。
Current thinking is that some 4 billion years ago, a Mars-sized object smashed into the proto-Earth, knocking off a chunk of planet that eventually formed into the moon.
现有理论认为在大约40亿年前，一个火星大小的天体撞击了原始地球，星球被装出的部分最终形成了现在的月球。
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