https://en.wikipedia.org/wiki/Cherenkov_radiation https://en.wikipedia.org/wiki/Cherenkov_radiation The particles are still moving slower than Relativity's lim

https://en.wikipedia.org/wiki/Cherenkov_radiation https://en.wikipedia.org/wiki/Cherenkov_radiation The particles are still moving slower than Relativity's limit, the speed of light in a vacuum.