Multiple Choice
Because of the travel time of light, astronomers see more distant parts of the universe as they were when the universe was younger, but they cannot see back "into" times when the universe was opaque and light could not travel freely. Using photons, then, what is the furthest back in time that astronomers can when they look out into the universe?
A) 1/1 millionth seconds after the start of the Big Bang
B) 380,000 years after the start of the Big Bang
C) 3 minutes after the start of the Big Bang
D) 3000 years after the start of the Big Bang
Correct Answer:
Verified
Correct Answer:
Verified
Q22: Why is the universe expanding?<br>A) The energy
Q23: Why did the formation of particle-antiparticle pairs
Q24: Astronomers studying the cosmic microwave background have
Q25: When the Big Bang began, all the
Q26: If the early universe had been perfectly
Q28: How was the cosmic microwave background radiation
Q29: How does the observed total amount of
Q30: Many of the small temperature fluctuations in
Q31: What observations have MOST clearly revealed the
Q32: Which element(s) was (were) created during the