The Pierre Auger Observatory is now being constructed to understand the nature and origin of cosmic rays at ultra-high energies (>1019 eV). It will be the largest cosmic ray detector ever built, covering 3000 square kilometers in both hemispheres in its full configuration. First data show a very good performance of the apparatus.
PACS numbers: 95.55.Vj, 95.85.Ry, 96.40.-z, 98.70.Sa
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