I assume there's already a thread on this subject or at least was boarded at least a couple of times but I will give it a new try. I was reading about the Hubble's Law: Spoiler : All objects observed in deep space (interstellar space) are found to have a doppler shift observable relative velocity to the earth, and to each other. And, that this doppler-shift measured velocity, of various galaxies receding from the Earth is proportional to their distance from the Earth and all other interstellar bodies My question would be: Is the velocity of galaxies uniform? this meaning that it will always respond to the constant and thus the universe will continue to expand forever? or will the galaxies at some point in distant future be started to be pulled back by the own inertia of their movement? That's what scientist called "The big Crunch" right? thanks a lot for the help. P.S. Sorry if my terms are not the most precise.