Back جسيم عديم الكتلة Arabic Бязмасавыя часціцы Byelorussian Безмасова частица Bulgarian Partícula sense massa Catalan Массăсăр пĕрчĕ CV Luxon German Partícula sin masa Spanish Luxoi Basque ذره بدون جرم Persian Massaton hiukkanen Finnish
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In particle physics, a massless particle is an elementary particle whose invariant mass is zero. At present the only confirmed massless particle is the photon.