1E1740.7-2942, or the Great Annihilator, is a large black hole thought to be located in the core region of the Milky Way, near the supermassive black hole Sgr A* at the Galactic Center. It is one of the brightest gamma ray sources found in the Milky Way, producing massive amounts of photon pairs at 511 keV, which usually indicates the annihilation of an electron-positron pair. The Great Annihilator also has a radio source counterpart that emits jets approximately three light-years long. These jets are probably synchrotron emissions from positron-electron pairs streaming out at high velocities from the source of antimatter.
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