AIP EMILIO SEGRE VISUAL ARCHIVES, DARROW COLLECTION / SCIENCE PHOTO LIBRARY AIP EMILIO SEGRE VISUAL ARCHIVES, DARROW COLLECTION / SCIENCE PHOTO LIBRARY
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Cosmic ray particle. Image by Karl Darrow (1891-1982), showing the track of a cosmic ray particle with abundant branches (auger). Cosmic rays are high-energy radiation of unknown origin, mainly originating outside the Solar System. This radiation mainly consists of high-energy protons and atomic nuclei. Data from space telescopes now suggest that a high proportion of this radiation comes from the supernovae of massive stars.
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