How do I calculate the redshift of a galaxy that is 650 Mpc away if I am only told its spectral lines should show a redshift z=.15?
Of course...you are right....what I should have asked was:
Is it true that a galaxy 650 Mpc's away has a redshift of z=.15.
If it is true, how do you know?
I think I understand your situation, maybe. Sometimes in a textbook they have examples and exercises to THINK ABOUT, but you don't have to hand in your answer for a grade.This is not a homework question... I am a mature student studying Astronomy for the first time. This is a question in an assignment ...