If the redshifts of quasars arise from the expansion of the universe,yet they have brighter magnitudes than galaxies with the same redshifts,what must be generally true of quasars?
A)They are very small.
B)They are within the Local Group.
C)They are moving toward Earth with a large radial velocity.
D)They emit a very large amount of energy per second.

Question

Quizplus · Accepted Answer

The fact that quasars have brighter magnitudes than galaxies with the same redshifts suggests that quasars emit a large amount of energy per second. This is consistent with the observation that quasars are extremely luminous, with some emitting as much energy as an entire galaxy.

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