Observation of a large-scale anisotropy in the arrival directions of cosmic rays above 8 × 1018 eV.

Cosmic rays are atomic nuclei arriving from outer space that reach the highest energies observed in nature. Clues to their origin come from studying the distribution of their arrival directions. Using 3 × 104 cosmic rays with energies above 8 × 1018 electron volts, recorded with the Pierre Auger Obs... View More