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宇宙的外边是什么？
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问与答 - @ClassHacker - 最近迷上了科幻电影，令我最好奇的一个事是如果宇宙是没有边界的，就是宇宙最大，那到底有多大。如果宇宙有边界，那宇宙的外边是什么。。。（继续探索中。。。）
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