Spatial Gravity.

Hubble's correlation of red-shift with distance reveals that the universe is expanding, and that spacetime curvature has increased over time. And since time and space have equal status as dimensions, an object moving through time experiences increasing spatial curvature due to expansion, just as it does when moving through space towards a massive body. So expansion must increase gravity, and this increase would be proportional to the amount of red-shift. The kinetic energy of expansion is thus exchanged for curvature of spacetime, and this results in spatial gravity. Momentum therefore fuels both spatial and massive gravity. And spatial gravity, which must therefore be proportional to the size of the universe, combines with massive gravity to produce overall gravity. A cosmological factor proportional to the size of the universe is therefore appropriate. And the very expansion which causes increasing spatial gravity, should cause expansion to be self-limiting.