The vast majority of antimatter in the early universe must have been annihilated with matter.
Antimatter is a material made up of subatomic particles with the mass, electric charge, and magnetic moment of electrons, protons, and neutrons in regular matter but with the opposite signs for these three properties. Positron (e+), antiproton (p), and antineutron (n) are the names of the antimatter particles that correspond to electrons, protons, and neutrons, respectively. These particles are collectively referred to as antiparticles. The positron has a positive charge, the antiproton has a negative charge, and the antineutron, though electrically neutral, has a magnetic moment with the sign opposite that of the neutron because the electrical properties of antimatter are the reverse of those of regular matter.
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