HomeAstronomyWhy time-traveling tachyons probably don't exist

Why time-traveling tachyons probably don’t exist

Tachyons are hypothetical particles that always travel faster than the speed of light. Einstein showed that such particles would allow for communication back in time, which opens up all sorts of problems with a fundamental rule of the universe. While physicists haven’t proved that tachyons can’t exist, there’s good reason to believe they don’t.

The barrier that nothing with mass can travel at the speed of light isn’t just an expression of the limitation of engineering or a representation of a failure of imagination. It’s baked into the very laws of the universe, as expressed by Einstein’s theory of special relativity.

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