Luxon

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A luxon is a particle that always travels at the speed of light. Currently, the only known luxons are the massless gauge bosons: the photon (carrier of electromagnetism) and the gluon (carrier of the strong force). However, gluons are never observed as free particles, since they are confined within thought to be a luxon; but, because neutrinos change flavour as they travel, they must have mass. Regardless of the fact that their mass is extremely small and that they move at nearly the speed of light, neutrinos must be bradyons.

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