Hey guys, I feel like an idiot for asking this. However, I wanted to make sure that my head was screwed on straight before I asked my old astronomy professor permission to use some of his old lecture notes. Is gravitational redshift one of the causes of Hubble's Law? Is the Redshift of the hydrogen spectrum from Galaxies an example of Gravitational redshift or is it a part of that redshift? I feel like Redshift of Galaxies is not a perfect example; however, I am not 100% sure. However, I should know this and I am kind of too embarrassed to ask my old astronomy professor. P.S. Actually pictures/graphs would be really nice >,< (embarassed face) Does anyone know of any good pictures or graphs showing the redshift of galaxies and what part of that redshift is due to general relativity?