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(ed.) - Zum Ober-Bathonium (Mittlerer Jura) im Raum Hildesheim, Nordwestdeutschland. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface.Composed primarily of high-energy protons and atomic nuclei, they are of mysterious origin.At the higher end of the energy spectrum, relativistic kinetic energy is the main source of the mass-energy of cosmic rays.The Oh-My-God particle, the highest-energy fermionic cosmic ray detected to date, had an energy of about times more energetic than the highest-energy detected cosmic photons.

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