NASA: Fermi Probes "Dragons" of the Gamma-ray Sky
Posted: Tue Mar 02, 2010 7:44 pm
NASA's Fermi Probes "Dragons" of the Gamma-ray Sky
NASA Fermi Mission News - 2010 March 02
NASA Fermi Mission News - 2010 March 02
Universe's Energetic Cosmic Fog Stumps Scientists: Space.comOne of the pleasures of perusing ancient maps is locating regions so poorly explored that mapmakers warned of dragons and sea monsters. Now, astronomers using NASA's Fermi Gamma-ray Space Telescope find themselves in the same situation as cartographers of old. A new study of the ever-present fog of gamma rays from sources outside our galaxy shows that less than a third of the emission arises from what astronomers once considered the most likely suspects -- black-hole-powered jets from active galaxies.