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RE: Can dark matter be made of black holes (or machos)?
Well there is another evidence for the existence of black holes (here, the super-massive one at the center of our galaxy): If you observe the motion of stars nearby, you observe that they are in orbit around a dark point, and that this point must have a huge mass.
That study took years, but the observation is pretty clear:
Yes, you are totally right. I forgot about those pieces of evidence (less exciting than the GW ones :) ).