... Fermi catches thunderstorms hurling antimatter into space . Scientists think the antimatter particles formed in a terrestrial gamma-ray flash, a brief burst produced inside thunderstorms and associated with lightning. ... Scientists using NASA's Fermi Gamma-ray Space Telescope have detected beams of antimatter produced above thunderstorms on Earth, a phenomenon never seen before. ... The distant storm was below Fermi's horizon, so any gamma rays it produced could not have been detected. ...