I've never been a fan of Dark Matter. Not all galaxies have dark matter, but only incredibly diffuse galaxies don't have it[0]. Doesn't that mean that the densi

I've never been a fan of Dark Matter. Not all galaxies have dark matter, but only incredibly diffuse galaxies don't have it[0]. Doesn't that mean that the density of matter in a galaxy is what gives rise to "faster rotations/more gravity", and not just the total matter irrespective of its galactic density? Furthermore, the "Bullet Cluster" example is telling. Apparently, the extra mass stuck around the more dense part of the galaxy, and not in the less dense gas cloud that resulted from the collision. Again, only the dense parts of this cluster exhibit "faster rotations/more gravity". So to me, this is terribly un-compelling. So there's a magic invisible matter that just so happens to only coalesce around dense galaxies/galactic areas and never around sparse ones. [0] http://www.astronomy.com/news/2019/03/ghostly-galaxy-without-dark-matter-confirmed http://www.astronomy.com/news/2019/03/ghostly-galaxy-without... edit: s/no matter/irrespective of (poor use of the homonym "matter")