Ironically, this indirect evidence of a destructive planetary collision could also be the first indication that planetary systems can form around close binary stars.

更讽刺的是，这个毁灭性的行星对撞，很可能也是行星系统有可能在密近双星周围形成的首个间接证据。

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But many stars are partnered in binary star systems.

ECONOMIST: The dizziest, giddiest stars

Most stars in the galaxy are, in fact, in binary systems, and astronomers have been wondering whether the gravity of a second star nearby might disrupt a dust disc too much for planets to coalesce.

ECONOMIST: Dusty genesis

Secondly, the detection of multiple planets demolishes once and for all the lingering doubts of some astronomers that the single planets found around other stars are not planets at all, but small, faint components in otherwise conventional binary star systems.

ECONOMIST: Planet hunting