They comprise over ten billion particles and, at the Auger Observatory, are detected by way of the Cherenkov gentle they produce in a number of of 1600 detectors, every containing 12 tonnes of water, spread over 3000 km2 of Western Argentina, an area comparable to that of Rhode Island. Ever for the reason that existence of cosmic rays with particular person energies of several Joules (1 Joule = ~ 6×1018 eV) was established in the 1960s,
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