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星系“变脸” 人类也许见证了类星体的诞生
source link: https://tech.sina.com.cn/d/s/2019-10-08/doc-iicezzrr0720769.shtml
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来源：科技日报天文学家发现，每个星系中心往往会存在一个超大质量黑洞。究竟宇宙中是先有星系中心黑洞再吸积周围物质形成星系，还是先有星系再孕育中心黑洞？这个问题就像“鸡生蛋还是蛋生鸡”一样，至今尚未有定论。但公认的一点是，星系中心黑洞对星系的影
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