Multiple Choice
Why are some galaxies' spectra blueshifted rather than redshifted?
A) Some distant galaxies are gravitationally lensed.
B) Some distant galaxies show the universe was contracting before the Big Bang started.
C) Some nearby galaxies have vigorous star formation and are much bluer than others.
D) Some distant galaxies have AGN at their centers.
E) Some nearby galaxies have small peculiar velocities in our direction.
Correct Answer:
Verified
Correct Answer:
Verified
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