Antimatter consists of particles that have the same mass as ordinary matter but opposite electric charge and certain other properties.

For example, the electron has an antimatter counterpart called the positron. When a particle of matter encounters its antimatter equivalent, the two can annihilate each other, converting their mass into energy.

Antimatter is produced naturally in some radioactive processes and can also be created in particle accelerators. Although matter and antimatter should have been produced in nearly equal amounts after the Big Bang, the reason why the universe is dominated by matter remains one of the greatest mysteries in physics.

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