The proper interpretation of a what a galaxy's redshift measures is ____.
A) its motion in space toward the observer
B) its motion in space away from the big bang
C) the stretching of space between the galaxy and the observer
D) the contraction of space between the galaxy and the observer
E) the stretching of space between the galaxy and the big bang

Question

Quizplus · Accepted Answer

The redshift of a galaxy is interpreted as the stretching of space between the galaxy and the observer, which is a key concept in understanding the expansion of the universe. This phenomenon is consistent with the predictions of the general theory of relativity and the observation that the universe is expanding.

The Proper Interpretation of a What a Galaxy's Redshift Measures