I could benefit from someone shedding some light on a couple of questions that I have regarding the speed of various entites: 1) It seems that the speed of gravity, e.g, if the sun disappeared, is the speed of light WRT things I've read. What is it that would inherently cause gravity to travel at c, since presumably the fundamental nature of the causation is different? Could it be that gravity's speed would be infinite, except that it can't exceed 'c'? 2) Has anyone been able to define a speed associated with the strong and weak nuclear forces? If no, could/should one assume that those forces also move at the speed of light?