Multiple Choice
Why are some galaxies' spectra blueshifted rather than redshifted?
A) Some distant galaxies are gravitationally lensed.
B) Some nearby galaxies are attracted to us because of the mass of the Milky Way.
C) Some nearby galaxies have vigorous star formation and are much bluer than others.
D) Some distant galaxies have AGN at their centers.
Correct Answer:
Verified
Correct Answer:
Verified
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