The antiparticle of a proton, with the same mass but opposite electrical charge, predicted by physics theory and created in laboratories.
From 'anti-' (opposite) + 'proton,' combining the prefix with the subatomic particle name; term emerged from 1930s particle physics when antimatter was theoretically predicted.
Antiprotons are the mirror versions of regular protons—when they touch regular matter, both vanish in a burst of pure energy! Scientists created them in 1955 and won a Nobel Prize, proving Einstein's matter-energy ideas were right.
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