Then shouldn't it be able to, under proper conditions, be able to interact (if only slightly) with other particles? I do know that it is weakly interacting, but calculations have shown that it is likely that billions of these dark matter particles pass through a cubic meter every second. If the concentration of light was high enough, then it should interact with at least some of the particles. This would take effect in the Michelson-Morley experiment, and light moving in one direction would appear to be moving slower than light in the other direction, thanks to dark wind. However, since such a thing does not seem to occur, the existance of dark matter seems to be very much like the existance of ether. I do realize that dark matter has mass, but because it has mass, it should interact with other particles under proper circumstances.
- Joe Antognini

• Mass bends light, but does not slow it down - yanniru - February 26, 2003 - 13:19 UTC