Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Antihydrogen 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. Some physicists use the symbol H, that is, H with an overbar (pronounced / e t 'b r/ aitch-bar), while others use the names "Hbar" for neutral anti-hydrogen, and "Hbar +" for an ion of anti-proton with two anti-electrons.

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