I understand we don't know if the universe is finite or infinite, but I know that in the center of the Earth there is no gravity because the attraction from Earth's gravity is the same on all directions, so the final result is zero. So, if the universe is infinite and matter is equally distributed, then the attraction of gravity from the universe on any given point should be the same in all directions... therefore the final result should be zero, so the effect of the universe's mass in any point in space should be zero. That means the universe's mass should have no effect on slowing down its expansion. Ergo, the fact that the universe slowed down its expansion after the big bag should be evidence the universe is finite. Of course this argument is wrong... but I can't find where. Any help, please?