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Gluon, elementary subatomic particle that holds the parts of protons and neutrons together. Gluons have no mass, move at the speed of light, and multiply themselves so rapidly that they intensify their force. The theory of gluons, first presented by U.S. physicists H. David Politzer, David J. Gross, and Frank A. Wilczek in 1974, is called quantum chromodynamics (QCD).

See also: Physics.

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