What does Hubble's law tell us?
A)The faster a spiral galaxy's rotation speed,the more luminous it is.
B)The longer the period of a Cepheid variable,the greater its luminosity.
C)For every force,there is an equal and opposite reaction force.
D)The more distant a galaxy,the faster it is moving away from us.

Question

Quizplus · Accepted Answer

Hubble's law states that the more distant a galaxy is, the faster it is moving away from us. This is due to the expansion of the universe.

What Does Hubble's Law Tell Us