Special Relativity
The behavior of massless particles is understood by virtue of special relativity. For example, these particles must always move at the speed of light. In this context, they are sometimes called luxons to distinguish them from bradyons and tachyons.
See also: Mass in special relativityRead more about this topic: Massless Particle
Famous quotes containing the words special and/or relativity:
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—Willard Van Orman Quine (b. 1908)
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—Albert Einstein (1879–1955)