- #1

elliottmarter

- 15

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**A redshift survey has identified a galaxy cluster for which it infers a di stance of 520 Mpc. At what redshift is this cluster observed to be? You may use H0 = 72 km s−1 Mpc−1**

Now call me old fashioned but don't i need some kind of relativistic speed to calculate the redshift, i mean i have a distance of 520Mpc (=16.12x10^21m) and the hubble constant...but im sure i need a value for how fast its travelling away from me...

Thanks

EDIT i think i just realised that i times its distance by Ho to get its speed as its Kms-1 Mpc-1