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The answer is frame-dragging effect source: http://en.wikipedia.org/wiki/Frame-dragg...
Here is the best answer available I think:http://www.thenakedscientists.com/forum/index.php?topic=65064.0
I was curious, we always look at space as vast emptiness (not accounting for light rays and all the other energy waves, just talking about pure space), where once we thought it was an aether. Since we have so much secondary evidence (as in, we have not perceived space per se, but we see the affect it has on matter), do we have any theories that support space being itself a medium of some sort? It can be warped, it provides enough drag as to keep all but photons from going light speed. Light can be bent through it just as light can be bent through water or glass. It seems to me that space could be the "aether" past scientists thought it was, only it is a substance so inert that only matter attempting to travel at relativistic speeds are even affected by it.
it provides enough drag as to keep all but photons from going light speed
If the above were true, I think matter is like the oil to space's water. If you drop oil onto water, it automatically gets pushed into a circular shape. Could gravity not be a force of matter attracting to matter, but space pushing matter into "oil" globules?