According to Hubble's Law, if two galaxies are not part of our Local Group, and galaxy B is three times farther away from us as Galaxy A, then Galaxy B will
A) move toward us three times faster than A
B) move away from us nine times faster than A
C) move away from us three times faster than A
D) move toward us nine times faster than A
E) move away from us at about the same speed as A

Question

Quizplus · Accepted Answer

According to Hubble's Law, the recession velocity of a galaxy is proportional to its distance from us. Since Galaxy B is three times farther away from us than Galaxy A, its recession velocity will be three times faster than A. Therefore, the correct answer is C, which states that Galaxy B will move away from us three times faster than A.

According to Hubble's Law, If Two Galaxies Are Not Part