Perhaps there is a minimum distance -- a quantum of space -- and a minimum amount of time -- a quantum of time. I gave myself a headache on one rainy saturday thinking about the ramifications of quantum time. It's a very interesting idea.
If you imagine a quantum of space like a square in a checkerboard (and make it a cube so it's 3-dimensional) and a quantum of time as how long it takes a quantum of light to pass from one quantum cube to the next, and then you imagine that space can be deformed, so that one quantum is not the same physical size as the next, and that the time quantum doesn't change with the space quantum, then...
HEADACHE!
Is there a graviton responsible for propagation of mass attraction? With what does the graviton interact to deform spacetime? If two masses attract each other (deform spacetime in a way to influence each other's relative inertial existence), to what location of a mass or spacetime are the gravitons focused? Could it be that gravity is a temporal force/effect not strictly a spatial effect?... Might mass warp the planar 'smoothness' of present time rather than the volume of spatial spacetime?