If one galaxy is twice as far from Earth as another,its velocity will be
A) twice as much.
B) four times as much.
C) one-half as much.
D) one-fourth as much.

Question

Quizplus · Accepted Answer

According to Hubble's Law, the velocity at which a galaxy is moving away from us is directly proportional to its distance from us. Therefore, if one galaxy is twice as far from Earth as another, its velocity will be twice as much.

If One Galaxy Is Twice as Far from Earth as Another,its