Suppose that a particular galaxy is 400 million pc from Earth. What is the recessional velocity of this galaxy? Take the Hubble constant to be 73 km/s/Mpc.

Question

Quizplus · Accepted Answer

We can use Hubble's law to calculate the recessional velocity of the galaxy:

v = H0 * d

where v is the recessional velocity, H0 is the Hubble constant, and d is the distance to the galaxy.

Plugging in the given values, we get:

v = 73 km/s/Mpc * 400 million pc
  = 29,200 km/s

Therefore, the correct answer is D: 29,200 km/s.

Suppose That a Particular Galaxy Is 400 Million Pc from Earth