20 The universe is still a big question ? What is the function of dark matter and dark energy in our great universe ? Dark (non / bayronic ) matter 28 % ( waste of the big bang ) and dark energy 70,66 % ( energy source for the anti gravity force ) are dark because they are hiding near a black hole. A black hole is a sort of coat rack and foundation for a complete galaxy.
See interesting article , arguments and comments on page http://bigbangevolution.com/bigbang-theory/