If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth
A)Galaxy A is four times closer than Galaxy B.
B)Galaxy A is four times further away than Galaxy B.
C)Galaxy A is twice as distant than Galaxy B.
D)Galaxy A is twice as close than Galaxy B.

Question

Quizplus · Accepted Answer

According to Hubble's Law, the recessional velocity of a galaxy is directly proportional to its distance from Earth. If Galaxy A has a four times greater recessional velocity than Galaxy B, it means that it is moving away from us four times faster than Galaxy B. Therefore, it must be four times further away from us than Galaxy B.

If Galaxy a Is Found to Have a Recessional Velocity