Cosmic rays are energetic particles that originate in space and impact the Earth's atmosphere. This picture comes from the Pierre Auger Observatory. It is the world's foremost cosmic ray observatory. These rays are made of protons, electorns, and ionized nuclei of light elements. A ultra-high-energy cosmic ray has extreme kinetic energy. Its energy is more than its rest mass and the amount of energy of other typical cosmic rays. Sometimes the energy can be greater than the Greisen-Zatsepin-Kuzmin limit.
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