【宇宙雜談】如何知道宇宙中究竟有多少個星系？| Linvo說宇宙
Synopsis
宇宙中究竟有多少個星系？這個問題網上一搜，有說1000億的，有說2000億的，也有說兩萬億的。到底哪個數字更接近真實情況呢 ...
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