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. Photons bombarded hydrogen atoms and broke them up into helium atoms.
C. Helium was formed in the cores of stars formed in the early Universe.
D. Helium was not formed in the early Universe, because only neutrons were present.
Answer: A
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