There’s Only One Way To Beat The Speed Of Light
"The discovery and understanding of Cherenkov radiation was revolutionary in many ways, but it also led to a frightening application in the early days of laboratory particle physics experiments. A beam of energetic particles leaves no optical signature as it travels through air, but will cause the emission of this blue light if it passes through a medium where it travels faster than light in that medium. Physicists used to close one eye and stick their head in the path of the beam; if the beam was on, they’d see a “flash” of light due to the Cherenkov radiation generated in their eye, confirming that the beam was on. (Needless to say, this process was discontinued with the advent of radiation safety training.)
Still, despite all the advances that have occurred in physics over the intervening generations, the only way we know of to beat the speed of light is to find yourself a medium where you can slow that light down. We can only exceed that speed in a medium, and if we do, this telltale blue glow — which provides a tremendous amount of information about the interaction that gave rise to it — is our data-rich reward. Until warp drive or tachyons become a reality, the Cherenkov glow is the #1 way to go!"
Wish you could break the speed of light? Unfortunately, there's no way to beat it in a vacuum. But if you're willing to go into a medium, it not only becomes easy, but you can see the results for yourself.
