In Humphreys' model, because the universe has a center and an edge (unlike the unbounded model of the Big Bang universe), the center of the universe is also the center of a [[gravity well]], meaning that gravity is stronger at the center of the universe than at the edge. | In Humphreys' model, because the universe has a center and an edge (unlike the unbounded model of the Big Bang universe), the center of the universe is also the center of a [[gravity well]], meaning that gravity is stronger at the center of the universe than at the edge. |