Where did the cosmic microwave background (CMB) come from
A) photons emitted from the first stars
B) photons released from hydrogen in our galaxy
C) light scattered by dust in our Solar System
D) photons released when electrons and nuclei combined for the first time
Correct Answer:
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Q21: The density of the Universe is
A)equal to
Q22: If galaxy A is four times more
Q23: Astronomers believe that the hydrogen atoms in
Q24: What observation has prompted astronomers to ponder
Q25: Whether the Universe is open, closed or
Q27: Which of the following types of Universe
Q28: Current evidence suggests that the Universe is
A)flat,
Q29: Why is the cosmic microwave background (CMB)
Q30: Possible equations (choose the correct one):
Q31: Astronomers have found the center of the
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