If there were more than one than they could have been spread out and also interact with each other. How do we know that if black holes become several billion solar masses that they don’t explode out as quasars with high “Doppler” redshift due to intense gravity acting on the energy escaping from a black hole that ate it’s own galaxy and throws it back up? Perhaps it “recycles the heavier element back into lighter elements on its way back out.

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