Hello. this question is regarding the speed of light  quick thought experiment:  you have a rod that is 1 million kilometers across.  if the rod can be moved slightly from either end, the other end will move as well.  because this can serve as a signaling method to get small pieces of information across vast distances instantaneously, does it violate the speed of light?

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.