Question

question 4
velocity, v (km s-1)
20000
15000
10000
5000
0
100
200
300
distance, d (millions of parsecs)
which galaxy would be more redshifted?
galaxy y
galaxy z

Explanation:

Red - shift is related to the velocity of a galaxy moving away from us. According to Hubble's law, the greater the velocity of a galaxy's recession, the greater the redshift. From the graph, Galaxy Y has a higher velocity (at a given distance) compared to Galaxy Z. Higher velocity means more redshift.

Answer:

Galaxy Y