The spectra of most galaxies tell us that
A) most galaxies appear to be moving away from us.
B) their light comes predominantly from objects other than stars.
C) most galaxies contain clouds of gas that are absorbing their favorite wavelengths.
D) galaxies in the past rotated at a faster rate than they do today.

Question

Quizplus · Accepted Answer

The spectra of most galaxies show redshift, indicating that they are moving away from us. This is a key piece of evidence for the expanding universe and the Big Bang theory.

The Spectra of Most Galaxies Tell Us That