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|Description||The Pierre Auger Cosmic Ray Observatory is studying ultra-high energy cosmic rays, the most energetic and rarest of particles in the universe. When these particles strike the earth's atmosphere, they produce extensive air showers made of billions of secondary particles. While much progress has been made in nearly a century of research in understanding cosmic rays with low to moderate energies, those with extremely high energies remain mysterious. The Pierre Auger Observatory is working on solving these mysteries. The Observatory was constructed and is operated by the Pierre Auger Collaboration, an international collaboration of about 90 institutions in 18 countries. Funding is provided by scientific funding agencies in each of the participating countries. To achieve the scientific goals, the collaboration designed the Auger Observatory for a high statistics study of cosmic rays at the highest energies. Measured properties of the air showers determine the energy and arrival direction of each cosmic ray. They also provide a statistical determination of the distribution of primary masses (cosmic ray composition). The Auger Observatory in the Province of Mendoza, Argentina, has been taking data since 2004, adding detectors as they became active until completion in 2008.|
|Status||Operational since 2008|
|Scientific Domains||Physical Sciences and Engineering|
|RI Categorization||Astro-particle and neutrino detectors and observatories|
|Location||Av. San Martin Norte 304, Malargue, Mendoza, Argentina|