How was most of the helium in the universe created?
A) by nuclear reactions in the cores of stars and then thrown out into space by supernovae
B) by high-energy processes during the collapse of pregalactic clouds during the formation of galaxies
C) by nuclear reactions during the first 3 minutes following the Big Bang
D) by the collision of cosmic rays with hydrogen nuclei in interstellar gas clouds

Question

Quizplus · Accepted Answer

Most of the helium in the universe was created during the first 3 minutes following the Big Bang, during a process known as Big Bang nucleosynthesis. This process involved the fusion of protons and neutrons to form helium-4 nuclei.

How Was Most of the Helium in the Universe Created