Abstract
Several experiments have accumulated over 100 events withenergies of cosmic rays exceeding 4×1019 eV. These eventshave macroscopic energies, unobserved sources, unknown chemicalcomposition and the spectrum astonishingly shows no GZK cut-off. Thereare no easy explanations as to how known astrophysical objects canaccelerate particles to these energies. Their observation thus remains apuzzle for conventional astrophysics mainly due to the lack ofstatistics. This paper reviews the present experimental status of thefield. Special attention is devoted to the running experiments and to thePierre Auger observatory.
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