Imagine that the expansion of the Universe proceeds at a constant rate at later times.How will the redshift of a particular galaxy change?
A) It will decrease.
B) It will remain the same, because the light will spend more time traveling.
C) It will remain the same, because all lengths expand by the same factor.
D) It will increase.

Question

Quizplus · Accepted Answer

If the Universe is expanding at a constant rate, the distance between galaxies is constantly increasing, causing the wavelength of light emitted by a galaxy to stretch and the redshift to increase. Therefore, the answer is D, it will increase.

Imagine That the Expansion of the Universe Proceeds at a Constant