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@saoqingniang 答案是星系悬臂是(密度)波。这么一说好像确实有点儿走近科学?
就像马路塞车一样,恒星进进出出只是在悬臂位置暂时挤在一起,而非像扇叶那样永远在一起转……

@fulkrum 鉴于我只能假装听懂,好像没那么《走近科学》也没有很男 XD

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