> I find this essay very curious, especially the strong view against the Bullet Cluster supporting the model of Dark Matter. This is the first time in professio

> I find this essay very curious, especially the strong view against the Bullet Cluster supporting the model of Dark Matter. This is the first time in professional astronomy I've seen this brought up. I've heard it in a few places, starting not too long after the bullet cluster lensing results were published. I thought some revised LCDM studies found the velocities were less discrepant than originally argued, but I think it's still a few sigma off. Regarding the question of the offset in visible versus total inferred matter, I think MOND proponents would note that MOND doesn't work in clusters with only the baryonic mass we see. At those large scales MOND still requires some form of dark matter, though I believe it is argued a light non-WIMP particle can do it (neutralinos?) and is at a factor of ~2 level, not a factor of 5 or 8 like dark matter. But I have never heard if you can get that type of displacement with those types of particles.