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时间简史
姚雪晴
7559f740-5064-103a-917d-ab4bc38c0954
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我们看到的从很远星系来的光是在几百万年之前发出的，在我们看到的最远的物体的情况下，光是在80亿年前发出的。这样当我们看宇宙时，我们是在看它的过去。
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