When the universe was __________ old,approximately 24 percent of the normal matter in it had been turned into helium.
A) 5 minutes
B) 8 hours
C) 1,000 years
D) 4.5 billion years

Question

Quizplus · Accepted Answer

The process of nucleosynthesis that converts normal matter into helium occurred during the first few minutes after the Big Bang. Therefore, the correct choice is A) 5 minutes.

When the Universe Was __________ Old,approximately 24 Percent of the Normal