Most of the universe may be trapped inside of ancient black holes
http://finance.yahoo.com/news/most-universe-may-trapped-inside-153458751.html
#Black holes Matter

I've ever heard an expert of astronomy (on geography channel if I'm not mistaken) said that universe is full of dark matter, but they can't prove it.

I heard there was some proofs for the existence of dark matter in the universe. But still lack of evidence for "full of" dark matter.