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 a foundation for a complete galaxy.
https://searchingforanswersaboutbigbang.com/einstein-said-gravity-is-not-a-force/
https://searchingforanswersaboutbigbang.com/big-bang-theory/