A star might not gobble a Jupiter whole when it moves close enough, but it could surely swallow a canapé like proto-Earth.

即便离得足够近，恒星也无法整口吞下木星大的行星，但它要吞下地球这么大的行星肯定是小菜一碟。

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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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It holds that the Moon formed from the debris kicked into orbit by the collision of a smaller proto-planet with the infant Earth.

BBC: Moon formation: New spins put on old questions