When astronomers view a distant quasar with highly redshifted emission lines in its spectrum, this wavelength shift is a
A) Doppler shift.
B) gravitational redshift.
C) cosmological redshift.
D) Doppler shift or a gravitational redshift or a cosmological redshift-they are one and the same thing.

Question

Quizplus · Accepted Answer

The redshift observed in distant quasars is primarily due to the expansion of the universe, which is known as cosmological redshift. This is different from Doppler or gravitational redshifts.

When Astronomers View a Distant Quasar with Highly Redshifted Emission