Travel faster than the speed of light. ... At the velocity of light, if you were somehow to reach it, your mass will be infinite and it will so require infinite force to push you, so no going beyond that speed. This is the reason time flows in a single direction.
Answers
Explanation:
Assuming the rod is completely rigid and motion is in-fact matter translation (not wave transmission), still the rod motion will transfer at the speed of light. Why is that? Assume that the 2 different ends of the rod are in the inertial reference frames with 0 relative velocity. For a distance observer also at 0 speed w.r.t. to both, the act of pushing the rod from moon, which implies acceleration will create a space-time voxel around the rod, which will compress the space-time around start of the rod and this voxel will move at the speed of light along the rod (In 4D space-time it is a fixed bundle of trajectories of the space-time bend), expanding when the deceleration is applied to stop the rod. If the rod is accelerated and then just bought to a uniform velocity and never stopped, the rod will appear to be shorter as it shows up in the Lorentz transformation.
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