Movement explains it
Here is a weird ramble...
If you take an hard-boiled egg and spin it in a shallow plate of water the water "rides" up the side of the egg's shell and, when the water reaches a certain hight, it spins off in a spinkler effect.
Bear with me...
If you move a iron bar in a coil of wire you generate a current.
Gravity could be the function of "movement" through a process that we have yet to understand. Nothing is "not moving" in the universe. A combination of forces, centrifigal, magnetic, etc. etc could all be used to explain gravity.
Einstine(sp?) tried to explain it in his Unified Field theory but from what I remember he did not complete it.
What would happen if all movement in the Universe came to a stop? No spining planets. No orbiting bodies. No galaxies spining and moving through the Universe. No atomic "movement".
Heat is generated through movement. (Atomic exchange of energy)
Magnitisim is generated through movement. (Spining iron in the Earth's core)
Light is generated by movement. (Energy transfer through photons I believe)
And many other examples probably show this fact.
Gravity is probably "movement potental while in a moving state in relation to another movement potental"
Almost like potental and kinetic energy are defined.
Just a thought
P.S. Like the egg example above, what would happen if the Earth suddenly stopped spining, stopped orbiting the sun and stopped moving with the sun through the galaxy and the rest of the universe? Would we sit on the planet and freeze to death or would we fly off the surface because there is no movement to generate Gravity?(provided we survived the initial catastrophe of inerta pushing us at miles a second into our house walls etc.)