Cosmic rays are high-energy radiation, mainly originating outside the Solar System.
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.
Data from the Fermi space telescope (2013) have been interpreted as evidence that a significant fraction of primary cosmic rays originate from the supernovae explosions of stars.
NOTE: Above information has been taken from wikipedia and/or official websites of topics.
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