During what time interval was helium created in the Big Bang?
A) during the first 10-⁴³ s
B) during the first 10-⁶ s
C) during the first 500,000 years
D) during the first 3 minutes

Question

Quizplus · Accepted Answer

Helium was created during the first 3 minutes of the Big Bang, when the temperature and density were high enough for the fusion of protons and neutrons to form helium nuclei (alpha particles). This process ended when the temperature dropped below the threshold for further fusion reactions.

During What Time Interval Was Helium Created in the Big