Fastest Hypothetical Particle

Tachyon or tachyonic particle is a hypothetical particle that is believed to be faster than the speed of light. The word ‘Tachyon’ was first coined by Gerald Feinberg in 1967, but it was first proposed by German physicist Arnold Sommerfeld.

Recent studies and calculations have found that, unlike ordinary particles, tachyons gain speed while their energy decreases and vice-versa. The slowest speed achieved by tachyons is the speed of light.