Material made from antifermions. We define the fermions that are common in our universe as matter and their antiparticles as antimatter. In the particle theory there is no a priori distinction between matter and antimatter. The asymmetry of the universe between these two classes of particles is a deep puzzle for which we are not yet completely sure of an explanation.

See also: Antiatom, Antilepton, Antinucleon, Antiparticle, Antiproton, Matter.

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Subjects: Nuclear and Particle Physics