HW #11 Solutions
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•Question 4 ( 1
point) If a galaxy has a radial velocity (redshift)
of 5000 km/s, how far away is it? Assume a Hubble
Constant of 70 km/s/Mpc.
a.7 Mpc b.20 Mpc c.49 Mpc d.71
Mpc e.100 Mpc
•V = Hxd, so d = v/H = 5000 km/s/70 km/s/Mpc – the km/s cancel out to give 5000/70 Mpc = 71 Mpc
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