Gamma ray Rain from 3C 279 . ... Credit Copyright: NASA , DOE , International Fermi LAT Collaboration Explanation: If gamma-rays were raindrops a flare from a supermassive black hole might look like this. Not so gently falling on the Fermi Gamma-ray Space Telescope from June 14 to June 16 the gamma-ray photons , with energies up to 50 billion electron volts, originated in active galaxy 3C 279 some 5 billion light-years away. ... NASA Web Site Statements, Warnings, and Disclaimers . ...