The Doppler Effect: Near and Far Galaxies

[jerome951000]

I found a question in a Maltese physics past paper dealing with the doppler effect. I managed to figure out the part dealing with the effect of motion of the wave source, but i was asked this:

How does The Doppler Effect show us the difference between galaxies that are near and those that are far away?

I was familiar with the doppler effect and the motion of the source causing it, but i never knew that the distance could make a difference. Any help would be much appreciated.

 

[jtbell]

Try a Google search on "Hubble expansion".

 

[jerome951000]

thanks that was really helpful. it said that the redshift acquired value of the velocity of the receding galaxies is proportional to their distance from earth. thanks again :-)

 

[jerome951000]

how are the distances between the Earth and other galaxies deciphered using the redshift acquired velocity since these two are proportional?