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为什么星系中心几乎都有一个黑洞？ - 知乎
source link: https://www.zhihu.com/question/51813043/answer/668376040
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翻出来一个好久之前的挺有意思的问题。虽然已经有一个很好的回答了，但和这个问题相关的新进展还挺多的，…
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