Authors: Dwyer, Joseph R., Smith, David M.

Superior Title: Scientific American; Aug2012, Vol. 307 Issue 2, p54-59, 6p, 5 Color Photographs

Subject Terms: GAMMA ray measurement, THUNDERSTORMS, ELECTRON beams, ANTIMATTER, POSITRON scattering, GAMMA ray sources

Superior Title: Scientific American; Nov1969, Vol. 221 Issue 5, p57-58, 2p

Subject Terms: GAMMA ray sources, PHYSICISTS, BALLOONS in astronomy, IONIZING radiation

Geographic Terms: UNITED States, AUSTRALIA

Superior Title: Scientific American; Jan83, Vol. 248 Issue 1, p72-72, 1/3p

Subject Terms: MILKY Way, GAMMA ray sources, BLACK holes, GAMMA rays, GALAXIES

People: LEVENTHAL, Marvin