Dark, Dim, Not Well Lit, or Transparent Matter
Well, I don't have a lot to say on this point,
but I am it is a serious topic and so I just
want to refer anyone who is excited and
interested in this to the following video:
Lisa Randall - Dark Matter
Professor Randall has more out there on this subject
of course, but the above video contained a good
deal about the current state of investigations on this
subject.