An astronomer studying the spectrum of a distant galaxy finds that its recessional velocity is 14,000 km/s. What is the distance to the galaxy? Take the Hubble constant to be 73 km/s/Mpc.

Question

Quizplus · Accepted Answer

The distance to the galaxy can be calculated using Hubble's Law: velocity = Hubble constant × distance. Rearranging gives distance = velocity / Hubble constant = 14,000 km/s / 73 km/s/Mpc = 192 Mpc.

An Astronomer Studying the Spectrum of a Distant Galaxy Finds