Recent content by renmoresnow

Your replies are very helpful...I can attempt the question now...Thank you

Nothing to be weary off... I am interested in Astronomy and it is the basic stuff which I am finding difficult.. A friend suggested I try posting questions on this site. Sorry if that offends... Anyway, any suggestions you have to the question would be much appreciated.

This is not a homework question... I am a mature student studying Astronomy for the first time. This is a question in an assignment and an explanation of the correct answer might help me to better understand the relationship between distance and redshift and how this is expressed in maths.

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?

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?

How can you measure the mean density of a neutron star if your only told its mass is three times that of the Sun?