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MATTER ASYMMETRY. “The presence of remaining matter, and absence of detectable remaining antimatter, is called baryon asymmetry. The exact mechanism that produced this asymmetry during baryogenesis remains an unsolved problem.” https://en.m.wikipedia.org/wiki/Antimatter View in LinkedIn

ANTIMATTER IN HEAT. “Antiparticles are also produced in any environment with a sufficiently high temperature (mean particle energy greater than the pair production threshold). It is hypothesized that during the period of baryogenesis, when the universe was extremely hot and dense, matter and antimatter were continually produced and annihilated.” https://en.m.wikipedia.org/wiki/Antimatter View in LinkedIn

COSMIC ANTIMATTER. “Antiprotons have also been found to exist in the Van Allen Belts around the Earth by the PAMELA module.” https://en.m.wikipedia.org/wiki/Antimatter View in LinkedIn

ANTIMATTER ON EARTH. “Many different kinds of antiparticles are also produced by (and contained in) cosmic rays. In January 2011, research by the American Astronomical Society discovered antimatter (positrons) originating above thunderstorm clouds; positrons are produced in terrestrial gamma-ray flashes created by electrons accelerated by strong electric fields in the clouds.” https://en.m.wikipedia.org/wiki/Antimatter View in LinkedIn

RADIOACTIVE DECAY. “Positrons are produced naturally in β+ decays of naturally occurring radioactive isotopes (for example, potassium-40) and in interactions of gamma quanta (emitted by radioactive nuclei) with matter. Antineutrinos are another kind of antiparticle created by natural radioactivity (β− decay).” https://en.m.wikipedia.org/wiki/Antimatter View in LinkedIn