After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei.

Name: After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei.
Brand: Quizplus
Rating: 5.0 (40 reviews)

Question

Quizplus · Accepted Answer

After the Big Bang, nuclear reactions ceased when the universe cooled down, resulting in about 25% of the universe's mass being in the form of helium nuclei, with most of the rest being hydrogen.

After Nuclear Reactions in the Big Bang Had Ended, About