To people saying the Dark Matter sounds like aether, phlogiston, or miasma, I have to wonder. Dark Matter is simply something that isn't affected by electromagnetic fields. We already have particles that don't interact with one or more forces. The weak interaction only affects fermions and antifermions. The strong force only affects quarks, photos are massless, etc. What's so hard to accept about a particle that doesn't interact with electromagnetism, and thus neither absorbs nor emits light?