When astronomers look at distant galaxies, what sort of motion do they see?
A) The galaxies are all spinning rapidly.
B) The galaxies are all moving rapidly toward us.
C) The galaxies are all moving rapidly away from us.
D) Galaxies are orbiting a single point in the Universe.
E) Galaxies in half of the sky are moving away from us. Those in the other half are approaching.

Question

Quizplus · Accepted Answer

Astronomers observe that distant galaxies are moving rapidly away from us, which is evidence of the expanding universe and supports the Big Bang theory. This is known as the redshift phenomenon.

When Astronomers Look at Distant Galaxies, What Sort of Motion