What Has NASA's Fermi Satellite Found? (IMAGE)

NASA/Goddard Space Flight Center

What Has NASA's Fermi Satellite Found?

Caption

Active galaxies called blazars constitute the single largest source class in the second Fermi LAT catalog, but nearly a third of the sources are unassociated with objects at any other wavelength. Their natures are unknown.

Credit

NASA's Goddard Space Flight Center

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