The spectra of most galaxies show redshifts.This means that their spectral lines
A)have wavelengths that are longer than normal.
B)always are in the red part of the visible spectrum.
C)have wavelengths that are shorter than normal.
D)have a higher intensity in the red part of the spectrum.

Question

Quizplus · Accepted Answer

Redshift refers to the stretching of the wavelength of light towards the red end of the spectrum. This stretching implies that the light has a longer wavelength than normal and the spectral lines are shifted towards the red part of the spectrum. Hence, option A is the correct answer.

The Spectra of Most Galaxies Show Redshifts