There is also increasingly severe time dilation experienced by the traveler approaching the speed of light, and everything else ages as you travel. Mass gains weight as it accelerates and as it approaches the speed of light, it becomes infinitely heavy. With the old laws of physics, Einstein's special theory of relativity says that only particles with zero rest mass (like photons) may travel at the speed of light. Superluminal is an adjective used for a speed or velocity exceeding the speed of light. Faster-than-light ( FTL) communications and travel are the propagation of information or matter faster than the speed of light.
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