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2026SpringC T AST112 21228 21229 21230 21231 21232 21233 21234 22833 27731 27732 实验前：哈勃望远镜的膨胀

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对于银河系中的天体，z（或红移）总是远小于但对于遥远的星系，我们通常观测到的天体红移远大于…… 因为它们嵌入在一个宇宙之中，而这个宇宙是。

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