Ba al dakizue zer den positroia?

Horrela definitzen da: positroia elektroiari dagokion antipartikula da. Elektroiaren masa berdina du baina karga positiboa. Gogoratu elektroiak duen karga -1.6 × 10⁻¹⁹ C dela.

1928an, Paul Dirac fisikariak positroia aurresan eta gero, Carl D. Andersonek 1932an izpi kosmikoen elkarjotzeak hodei kamara batean partikula hauek sortzen zituztela aurkitu zuen.

Baina zer gertatzen da materia eta antimateria elkartzerakoan? Biak desagertuko direla. Beraz, positroia elektroiarekin elkartzerakoan biek deuseztuko dute baina hau ez da zertan berehala gertatu behar. Hori gertatzen den bitartean, segundo baten hamar milioirenetan, "heriotz dantza subatomiko" batean egon daitezke, bata bestearen inguruan biraka, atomo berezi bat sortuz. Zientzialariek atomo berezi honi positronio deritze.

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