Antihydrogen
Exotic particle made of an antiproton and positron / From Wikipedia, the free encyclopedia
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Antihydrogen (
H
) is the antimatter counterpart of hydrogen. Whereas the common hydrogen atom is composed of an electron and proton, the antihydrogen atom is made up of a positron and antiproton. Scientists hope that studying antihydrogen may shed light on the question of why there is more matter than antimatter in the observable universe, known as the baryon asymmetry problem.[1] Antihydrogen is produced artificially in particle accelerators.