By the time the universe was a few minutes old,the majority of the normal matter in the universe was hydrogen,and the remainder was mostly ________.
A) helium
B) neutrons
C) neutrinos
D) protons

Question

Quizplus · Accepted Answer

The process of nucleosynthesis in the early universe produced a significant amount of helium, but not enough to be the majority of normal matter. Neutrons and protons make up the building blocks of atoms, but they were still undergoing rapid fusion at this early stage. Neutrinos were also present, but they do not contribute significantly to the mass of the universe. Therefore, the best choice is A: helium was the remainder of normal matter in the universe.

By the Time the Universe Was a Few Minutes Old,the