Question

what are cosmic rays?

Answer 1

Cosmic rays are high-energy radiation, mainly originating outside the Solar System[1] and even from distant galaxies.[2] 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)[3]have been interpreted as evidence that a significant fraction of primary cosmic rays originate from the supernova explosions of stars.[4] Active galactic nuclei are also theorized to produce cosmic rays.[5]

Answer 2

cosmic rays are high energy radiation mainly originating outside the solar system and even from extent galaxies