Why Are Some Galaxies' Spectra Blueshifted Rather Than Redshifted

question 27

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.

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