What is meant by the redshift?
A) Distant galaxies appear red in color due to having older stars.
B) The temperature of distant galaxies is decreasing.
C) The spectral lines of the galaxies are shifted to redder wavelengths.
D) Distant galaxies appear red in color as their light passes through dust.
E) None of these choices is correct.

Question

Quizplus · Accepted Answer

Redshift refers to the phenomenon where the spectral lines of galaxies are shifted towards longer, redder wavelengths, typically due to the expansion of the universe causing galaxies to move away from us.

What Is Meant by the Redshift