Question

4. What is harder for the astronomer to measure: A galaxy's redshift (indicating recessional velocity) or its distance from Earth? Why? Explain your answer.

Answer 1

its distance from earth is harder

Answer 2

Its distance from the Earth

Step-by-step explanation:

Its distance from the Earth is more difficult to measure because to measure it we need the redshift anyways, or we can get a rough estimate by its brightness. To measure the redshift we just need its wavelength and some calculations.