Thunderstorms can create strong electric fields and energies high enough to accelerate electrons to create a gamma-ray flash. These gamma-ray flashes in turn generate fast-moving electrons and positrons, the antimatter equivalent of an electron. The collision of these two particles generates another gamma ray, which is picked up by the detectors on board Fermi.
We’re always excited here at GeekTech about new ways to generate positrons (and this discovery means that you don’t have to steal your antimatter from CERN’s accelerators in Switzerland); indeed, it’s probably being generated the next time an electrical storm passes through your area.
[via NASA]
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