If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately
A)2170 Mpc.
B)2030 Mpc.
C)30 Mpc.
D)0.03 Mpc.
E)147,000 Mpc.

Question

Quizplus · Accepted Answer

The Hubble Law states that the velocity of a galaxy (v) is equal to the Hubble constant (H) times its distance (d), or v = Hd. To find the distance, rearrange the equation to d = v/H. Substituting the given values, d = 2100 km/s / 70 km/s/Mpc = 30 Mpc.

If H Equals 70 Km/s/Mpc, Then a Galaxy with a Radial