How Was MOST of the Helium in the Universe Created

question 70

Multiple Choice

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

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