254万光年外的仙女座星系，正以每秒110公里的速度，向银河系坠落
Synopsis
你知道嗎，人類肉眼能看到的最遠天體，距離我們254萬光年。它就是仙女座星系，一個擁有一萬億顆恆星的宇宙巨獸。 此刻你在 ...
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