How do u measure the cosmological red shift? 4. You observe a distant cluster and determine...

Question:

how do u measure the cosmological red shift?

4. You observe a distant cluster and determine that it is 400 Mpc away. a. What cosmological redshift would you measure for a member of this cluster? b. How large was the Universe, relative to its present size, when the light we observe now was emitted?

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