Incredible Theoretical Particle Faster Than The Speed Of Light References. Web the speed of the particle (v particle, faster than light in the medium but slower than light in a vacuum), and the speed of light in the medium (v light ). Web a tachyon ( / ˈtækiɒn /) or tachyonic particle is a hypothetical particle that always travels faster than light.

These would allow superluminal communication, and for this reason are widely believed not to exist. The speed of light ( c) is a universal physical constant exactly equal to 299,792,458. Web these colossal machines accelerate subatomic particles to more than 99.99 percent the speed of light, but as physics nobel laureate david gross explains, these particles will never reach the cosmic speed limit.





