Quasars are so distant that their light has taken billions of years to reach the Earth; consequently, we see them as they were during the formation of the universe.
Quasars are so distant that their light has taken billions of years to reach the Earth; consequently, we see them as they were during the formation of the universe. A we see them as they were during B we see them as they had been during C we see them as if during D they appear to us as they did in E they appear to us as though in 答案是A
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发表于 2010-8-29 23:48:27
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发表于 2010-8-30 07:14:52
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