牧夫座空洞：直径2.5亿光年，内部只有不到100个星系存在 #探索宇宙 #星系 #地球 #天文
Synopsis
牧夫座空洞：直径2.5亿光年，内部只有不到100个星系存在#探索宇宙#星系#地球#天文.
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