The telescope launched in 2008, looks at the universe for gamma rays. The image above shows the whole sky. Gamma-ray sources are prevelent along the galactic plane (central bar) but are also scattered throughout the cosmos.
Every three hours the telescope takes an image of the whole sky and beams the image back to earth. It spits out 40 million bits of information per second.
The image above shows the recent detection of a huge flare in the crab nebula.
Active galactic nuclei are the most common Fermi gamma-ray sources.
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