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Loading contentMatter's mirror image — particles with the same mass but opposite charge, such as the positron discovered in cosmic rays in 1932. When matter and antimatter meet they annihilate into pure energy. Antiparticles are produced in high-energy astrophysical environments and are detected in cosmic rays reaching the Earth.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
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