In theoretical physics, a hypothetical elementary particle that carries the force of gravity, similar to how photons carry light.
Coined in the early 20th century from 'gravity' (from Latin 'gravitas' meaning weight) combined with '-on' (a physics suffix for particles), following the pattern of photon and electron.
Scientists invented 'graviton' as a theoretical particle we've never actually detected—it's one of physics' greatest unsolved mysteries because gravity is stubborn about fitting into quantum mechanics the way other forces do.
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