A massless particle is a particle whose invariant mass is zero. Currently, the only known massless particles are 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 hadrons.
Neutrinos were, until recently, thought to be massless; but, because neutrinos change flavour as they travel, at least two of them must have mass.
The meaning of these prepositional phrases has evolved over time. Do you know the original "object" of the preposition? I'll PLANT a hint for the next question in each question the way I've PLANTED a hint for my first question in this sentence.
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