I've just started learning about Hubble, Red shifts, and how we measure the universe's expansion. It seems that he had two theories, that there is a stationary universe where the red shift from all light sources would be consistent or a theory in which the galaxies would be receding (and have a 13% dimmer light source?) The problem I have is that isn't red shift a measure of how fast a light source is receding from you? How can there be stationary galaxies that have the same red shift with a "linear relation"(whatever that means?) ?