If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must
A)be very small.
B)be within the Local Group.
C)be a single star with an extremely large mass.
D)be moving toward Earth with a large radial velocity.
E)emit a very large amount of energy per second.

Question

Quizplus · Accepted Answer

Quasars are believed to be powered by supermassive black holes at the centers of galaxies, which consume large amounts of matter and emit huge amounts of energy. This energy emission makes them much brighter than galaxies with the same redshifts, even though they are much more distant.

If the Redshifts of Quasars Arise from the Expansion of the Universe