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Strictly speaking, it's not the case that special relativity rules out anything going faster than light. What it doesrule out is rather anything (any physical object or message) crossing the c-barrier. So it's theoretically possible for an object to travel faster than light, provided it always travels faster than light (i.e., c is its lower speed limit, rather than its upper one). Such objects, in the form of hypothetical subatomic particles dubbed "tachyons" (Greek for "speedy ones"), have been the subject of speculation since the 1960s.

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