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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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marked as duplicate by Rob Jeffries, Community May 7 '15 at 9:02

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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 May 7 '15 at 7:43
  • $\begingroup$ Also see physics.stackexchange.com/q/167250 which partly addresses your latter question. $\endgroup$ – Rob Jeffries May 7 '15 at 8:55
  • $\begingroup$ I agree that it is duplicated. Please improved it. $\endgroup$ – TBBT May 7 '15 at 8:56

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