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Orthopositronium was a form of positronium, an atom-like system consisting of an electron and a positron. As the electron and positron were oppositely charged, the particle behaved like a hydrogen atom; however, the positron had a much smaller mass than the proton it replaced. As the electron and positron were anti-particles of each other, any form of positronium was very unstable and its lifespan was measured in nanoseconds.