1: does the universe expand uniformly? 2: does galaxies closer to the calculated center expand faster or slower then galaxies further away? im asking because im wondering on what drives the accelleration of the universe. there are many factors involved like dark matter, dark energy, photons, gravity etc that could factor in on this. if for instance you have the center "C" and a galaxy closer to the center "G1" and a galaxy further away "G2" Gravity: C ---- G1 ---- G2 if only gravity was at work then G1 would be accellerating faster due to the pull from G2. G2 would be dragged backwards due to the gravity of G1. Photons: C ---- G1---- G2 if only photons would be the source then G2 would accellerate faster while G1 would slow down. these are just 2 examples but im looking for the answer to question 1 and 2 to figure this out. identifying all possible energies working in concert to either pull or push the galaxies would be a massive undertaking, especially the math but it would also allow us to figure out if accelleration will continue indefinately or if it will stop? right or wrong?