Some thought that the high energy particles could have been produced at the center of the Milky Way, which is known to harbor celestial objects that can accelerate particles to at least a million billion electronvolts. But the Pierre Auger Observatory analysis shows that the ultra-high-energy cosmic rays are coming from outside the galaxy. After accounting for the deflection of the cosmic rays by the Milky Way's magnetic field, the team found that the particles are traveling about 326 million light years from a region of extragalactic space containing several potential sources, such as active galactic nuclei and starburst galaxies.
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