A galaxy is measured to have a redshift of z = 5.0.This galaxy is
A) filled with very cold gas.
B) moving at 5 times the speed of light.
C) dominated by gravitational redshift due to its supermassive black hole.
D) dominated by older, redder stars.
E) so far away that cosmological redshift dominates our observation.

Question

Quizplus · Accepted Answer

A redshift of z = 5.0 indicates that the galaxy is very far away, and the redshift is primarily due to the expansion of the universe, known as cosmological redshift.

A Galaxy Is Measured to Have a Redshift of Z