text: give briefly about cosmic rays? in cosmic rays only so many particles were found, due to that only it is found that atom has structure. so it is very interesting, so, please say some thing a stream of ionizing radiation of extraterrestrial origin, consisting chiefly of protons, alpha particles, and other atomic nuclei but including some high-energy electrons, that enters the atmosphere, collides with atomic nuclei, and produces secondary radiation, principally pions, muons, electrons, and gamma rays.