NASA, Blazar Bonanza

A long time ago in a galaxy half the universe away, a flood of highenergy gamma rays began its journey to Earth. When they arrived in April, NASA s Fermi Gammaray Space Telescope caught the outburst, which helped two groundbased gammaray observatories detect some of the highestenergy light ever seen from a galaxy so distant. Astronomers had assumed that light at different energies came from regions at different distances from the black hole. Gamma rays, the highestenergy form of light, were thought