Massive objects, spin, and gravity reduction.
According to my theory (I know...who doesn't have one) if a large object, like a planet (or any object that has gravity really) was spun at light speed, it would cease to bend space time. That is, its gravity would be offset by its spin. This theory is based on an assumption that existence of a static object is still movement; outward expansion, or the fourth dimension of "time", and that time dilation is really the reduction of the creation/consumption of space as a function of existence. That is, existence of any sort is movement, not location, and that the speed of light is where an object ceases to require a "where" or space to "be". This would also reconcile the wave/particle paradox. You don't know where the particle is because at light speed, it is "no where". It is light speed.