The seven planets orbiting the star TRAPPIST-1 were largely spared cosmic collisions, raising questions about where these worlds got their water.

中文翻译：

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著名的太空家族有着令人惊讶的和平历史

围绕 TRAPPIST-1 恒星运行的七颗行星在很大程度上避免了宇宙碰撞，这引发了关于这些世界从何处获取水的问题。