what is the primary existance of dark energy?
A. stars do not produce enough energy to account for the amount of light radiation observed, so they have dark energy
B. Galaxies are releasing too much radioactive material to explain the amount of energy produced by stars so there must be dark energy to make up the balance
C. Dark energy is needed to produce some of the heavier elements in the universe that stars cannot generate the energy to do that
D. The universe is expanding too fast to be accounted for with current energy so dark energy must exist to increase the velocity of the expansion