If a galaxy has a radial velocity of 8000 km/sec and the Hubble constant is 70 km/sec/Mpc,what is the distance to this galaxy?
A)8.75×10‑³ Mpc
B)114 Mpc
C)8.75×10³ Mpc
D)2.4×10⁹ Mpc

Question

Quizplus · Accepted Answer

Using Hubble's law: 
v = H0 x d 
where 
v = radial velocity = 8000 km/sec 
H0 = Hubble constant = 70 km/sec/Mpc

d = v/H0 = (8000 km/sec)/(70 km/sec/Mpc) 
d = 114.29 Mpc

So, the distance to this galaxy is approximately 114 Mpc.

If a Galaxy Has a Radial Velocity of 8000 Km/sec