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I am not an expert in this field. I have seen documentaries on the Universe and have a basic idea of how black holes come to existence. When black holes form from supernovae they have a initial mass which is a factor of the progenitor's mass. My question is how do they evolve to the million/billion solar mass monsters lurking in galaxies?

In the same vein how do we explain the supermassive black holes in very old galaxies formed immediately after the big bang? Did they form immediately after the big-bang?

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  • $\begingroup$ They coalesce. It's really not that much different from solar system formation where masses come together through gravity--likewise gravity attracts black holes together. $\endgroup$
    – Jared
    Commented May 7, 2015 at 7:43
  • $\begingroup$ Also see physics.stackexchange.com/q/167250 which partly addresses your latter question. $\endgroup$
    – ProfRob
    Commented May 7, 2015 at 8:55
  • $\begingroup$ I agree that it is duplicated. Please improved it. $\endgroup$
    – TBBT
    Commented May 7, 2015 at 8:56

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