银河系中心异常明亮，为什么4000亿颗恒星同时围绕中心旋转？【九品博物官】
Synopsis
银河系包括了1000到4000亿颗恒星和大量星团云星，它的直径约为15万光年，中心厚度约为12000光年，在银河系中所有的恒星都 ...
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