Concerning dark energy, we do know:
A)that it is created when matter annihilates anti-matter.
B)its density remains constant over time, so it is not important in the early Universe.
C)combined with dark matter, it will ultimately produce a closed universe.
D)that it was revealed with Type II supernovae distances in the late 1990s.
E)that it makes up 90% of all the matter and energy in the whole universe.

Question

Quizplus · Accepted Answer

Dark energy's density remains constant over time, which means it becomes more significant as the universe expands, but it was not important in the early Universe.

Concerning Dark Energy, We Do Know