Massive particle
(Redirected from Bradyons)
Template:Short description Script error: No such module "Unsubst". The physics technical term massive particle refers to a massful particle which has real non-zero rest mass (such as baryonic matter), the counter-part to the term massless particle. According to special relativity, the velocity of a massive particle is always less than the speed of light.[1] When highlighting relativistic speeds, the synonyms bradyon (from Template:Langx, bradys, "slow"), tardyon[2] or ittyon[3] are sometimes used to contrast with luxon (which moves at light speed) and hypothetical tachyon (which moves faster than light).