Why is the cosmic microwave background (CMB) so cold if the early Universe was so hot
A) Enough time has passed for matter in the universe to release enough heat to cool down.
B) The CMB constantly interacts with atoms, which effectively cool down the photons.
C) The expansion of the Universe has redshifted those photons to an effectively cooler temperature.
D) Misleading; The big bang was initially hot but the CMB was released from cold material much later on.
Correct Answer:
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Q24: What observation has prompted astronomers to ponder
Q25: Whether the Universe is open, closed or
Q26: Where did the cosmic microwave background (CMB)
Q27: Which of the following types of Universe
Q28: Current evidence suggests that the Universe is
A)flat,
Q30: Possible equations (choose the correct one):
Q31: Astronomers have found the center of the
Q32: How old is the Universe since the
Q33: The flatness problem states that
A)the density of
Q34: If a galaxy is located at a
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