![]() ![]() ![]() ![]() Tachyons, particles whose speed exceeds that of light, have been hypothesized, but their existence would violate causality, and the consensus of physicists is that they do not exist. The special theory of relativity implies that only particles with zero rest mass may travel at the speed of light. Spacetime diagram showing that moving faster than light implies time travel in the context of special relativity.įaster-than-light (also superluminal, FTL or supercausal) communications and travel are the conjectural propagation of information or matter faster than the speed of light. ![]()
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