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.
Where to find this mysterious stuff ? In the center of several galaxies nearby a black hole.
How does this stuff look like ? Like garbage of the big bang hidden in a black hole . See evidence part 1 in my book. Despite of a huge knowledge of our universe .
There are severe problems to be solved as function inflation period ( due to the cosmological constant ) / mysterious repulsive force ( anti gravity driven by dark energy ) / nature of dark matter and energy ( garbage of the big bang and fuel for anti gravity ) See evidence part 1 – 4 .
Solutions to be found within my book The world according to the spirit . Convincing evidence part 1 – 8 based on verified and controlled satellite observations.
Under step 5 you will see the effects of step 1 – 4 for the law of energy conservation for the whole universe including the explanation for inflation / expansion of the universe / the function of black holes as the valve of the universe.