The Hubble constant is approximately 70 km/sec/Mpc. Roughly how far away is a galaxy with an apparent recession velocity of 2100 km/sec?

Question

Quizplus · Accepted Answer

The distance to the galaxy can be calculated using Hubble's Law, which states that the velocity of recession (v) of a galaxy is directly proportional to its distance from us (d), with the proportionality constant being the Hubble constant (H0). Mathematically, v = H0 * d. Rearranging for d gives d = v / H0. Substituting the given values, d = 2100 km/sec / 70 km/sec/Mpc = 30 Mpc.

The Hubble Constant Is Approximately 70 Km/sec/Mpc