How much gravity is needed to dim a light bulb? Could this exsperiment ever actuly be created? Also is the shape of a spiral galaxy like ours due to the effect of the supper massive black hole at its center has on all the other stuff in the galaxy ? Or is it because of the effect the black hole has on spacetime all the other stuff is just falling inwardly? From an observatinal stand point since we are in a spiral gallixy looking outwardly under the abouves inplyed effect wouldn't from our perspective the univurs seem to be expanding ?? Woulnt we need to be in a place in the univurs that is as far away from any mass as possible in order to make an observatinal messurment of exspantion and time dielation?