我知道密度很小相当于北京上海各放一枚硬币，但从星系这头到那头那么久远不早晚一枚硬币会撞上另一枚么？

来源: rmny 于 2026-03-25 13:44:29 [旧帖] [给我悄悄话] 本文已被阅读：次

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