Where did helium come from the early Universe?
A) The early Universe was so hot and dense that fusion of protons (hydrogen) into helium could occur.
B) Helium was formed in the cores of stars formed in the early Universe.
C) Photons bombarded hydrogen atoms and broke them up into helium atoms.
D) Helium was not formed in the early Universe, because only neutrons were present.

Question

Quizplus · Accepted Answer

In the early Universe, during the first few minutes after the Big Bang, conditions were hot and dense enough for nuclear fusion to occur, converting hydrogen into helium in a process known as Big Bang nucleosynthesis.

Where Did Helium Come from the Early Universe