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G'day Alex, I suppose that if dark matter is, and it is uniformly spread throughout the universe, then there would be no compelling force to make it clump in the center of a galaxy or anywhere else. Indeed it is unlikely that normal matter clumps in the center of a galaxy either. Sure the cores are dense, but if the outer lying material were to be lumped together, which would be the more massive? We are told by those who 'know' that some galaxies are tearing each other apart; so much for dominant gravity fields at the cores.
cheers.....
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