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NASAs Fermi Space Telescope Explores New Energy Extremes
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NASA's Fermi Space Telescope Explores New Energy Extremes

January 11, 2013
More than half of the sources above 10 GeV are black-hole-powered active galaxies. More than a third of the sources are completely unknown, having no identified counterpart detected in other parts of the spectrum. Credit: NASA's Goddard Space Flight Center