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How Many Aliens Are Out There?
If the hypothesis that I just described is on the right track, it would mean that the parameters of our universe have been selected so that intelligent civilizations will occur in sufficient numbers. If they reach something like technological maturity, let's define that as the ability to produce black holes, then that's not a highly improbable event. Even if you just get one of them in a galaxy, which is quite rare, it could be enough to dramatically increase the fecundity of the universe as a whole.