Ask Ethan: Can Gamma-Ray Jets Really Travel Faster Than The Speed Of Light?
There's an ultimate speed limit in the Universe: the speed of light in a vacuum, c. If you don't have any mass — whether you're a light wave (a photon), a gluon, or even a gravitational wave — that's the speed you must move at when you pass through a vacuum, while if you have mass, you can only move …
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