Multiple Choice
Which of the following is not an observed characteristic of the cosmic microwave background?
A) It has a perfect thermal radiation spectrum.
B) Its temperature is the same everywhere,except for small variations at the level of 1 part in 100,000.
C) Its temperature is a little less than 3 Kelvin (3 degrees above absolute zero) .
D) It contains prominent spectral lines of hydrogen,the primary chemical ingredient of the universe.
Correct Answer:
Verified
Correct Answer:
Verified
Q33: Why can't current theories describe what happened
Q34: If observations had shown that the cosmic
Q35: Process of Science: Inflation can explain some
Q36: What do we mean by inflation?<br>A)what happened
Q37: What is postulated to have caused a
Q39: According to the Big Bang theory,why do
Q40: GUT theories predict that protons will eventually
Q41: Why do we expect the cosmic background
Q42: We have conclusive evidence for inflation from
Q43: Olbers' paradox is an apparently simple question,but