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Last updated on April 18, 2014 at 1:21 EDT

Fermi Peers Deep Into A Microquasar

December 1, 2009

In Cygnus X-3, an accretion disk surrounding a black hole or neutron star orbits close to a hot, massive star. Gamma rays (purple, in this illustration) likely arise when fast-moving electrons above and below the disk collide with the star’s ultraviolet light. Fermi sees more of this emission when the disk is on the far side of its orbit. Credit: NASA’s Goddard Space Flight Center