Before about 50,000 years after the Big Bang, the universe was:
A)radiation dominated.
B)quark dominated.
C)lepton dominated.
D)matter dominated.
E)dark energy dominated.

Question

Quizplus · Accepted Answer

Before about 50,000 years after the Big Bang, the universe was radiation dominated. This period is characterized by the dominance of radiation (photons and neutrinos) over matter.

Before About 50,000 Years After the Big Bang, the Universe