25万颗恒星揭密：银河系可能是宇宙最早的星系？外星文明真的存在吗？
Synopsis
人类一直在追问：银河系到底有多古老？它是否可能是宇宙中最早形成的星系之一？最新的观测揭示，科学家通过分析25万颗恒星的 ...
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