Such a giant impact is unsurprising given the amount of material careening around the early solar system, and Earth-like planets in other systems may have moons, too.

 
  • 由于早期的太阳系充斥著大量四处游走的物质,这样的巨大撞击并不奇怪,且其他系统里像地球般的行星,也可能拥有月球。
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