Antimatter signature found... on Earth
Signature of antimatter detected in lightning
Fermi telescope finds evidence that positrons, not just electrons, are in storms on Earth
By Ron Cowen December 5th, 2009; Vol.176 #12 (p. 9)
WASHINGTON — Designed to scan the heavens thousands to billions of light-years beyond the solar system for gamma rays, the Fermi Gamma-ray Space Telescope has also picked up a shocking vibe from Earth. During its first 14 months of operation, the flying observatory has detected 17 gamma-ray flashes associated with terrestrial storms — and some of those flashes have contained a surprising signature of antimatter.
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