Solved

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

Question 23

Multiple Choice

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

Related Questions

Q6: Dark energy is a force that continually

Q18: What was the temperature of the universe

Q19: In a closed (spherical)universe,the sum of the

Q20: What would the universe be like if

Q22: Which of the following are NOT considered

Q25: Which was a triumph of quantum electrodynamics

Q26: The critical mass density of the universe

Q27: In order to produce an electron and

Q28: The ratio of the density in luminous

Q51: In quantum electrodynamics (QED), what mediates the