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人类文明能遍布银河系吗？我们能在这个小小的蓝色星球之外的广袤星系建立殖民地吗？这个问题还挺吓人的。银河系有3000亿颗恒星左右，从一边到另一边的距离是160000光年。现在为止，我们就发送了一艘宇宙飞船到太阳系外，以0.006%光速缓慢前行。以那个速度，得花不止25亿年才能横跨一个星系。然后就有了这个人类生存的问题。
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