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"Faster-than-light", also known as superluminal velocities, refers to any sort of travel at a speed greater than the speed of light. Prohibited in mainstream physics due to the Special theory of relativity.

"", also known as superluminal velocities, refers to any sort of travel at a speed greater than the . Prohibited in mainstream physics due to . Would be possible for "", particles with imaginary mass, but tachyons indicate an unstable , due to .

Such a phenomenon is generally taken to be false, as it violates .

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