The cosmic background radiation has a low temperature today because...
A) it is rich in heavy elements that absorb radiation very strongly.
B) the Universe has expanded, and expansion causes cooling.
C) it was created with a low temperature.
D) it has gotten so far from the Sun.
E) all the stars that were heating it have burned out.
Correct Answer:
Verified
Q19: If the Universe had _, that would
Q20: Olbers paradox asks...
A) Why isn't the night
Q21: The "light travel time distance" measures...
A) the
Q22: The Big Bang refers to...
A) the creation
Q23: The cosmic microwave background (CMB) radiation is...
A)
Q25: The _ is determined by the distance
Q26: Recent measurements of the variations of the
Q27: If the universe had _, that would
Q28: What is the cosmic horizon?
A) the place
Q29: If the Universe is infinitely large, infinitely
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