The term "Cosmic Rays" refers to elementary particles, nuclei, and electro-magnetic radiation of extra-terrestrial origin. These may include exotic, short-lived particles such as muons, pi-mesons or lambda baryons.

In the energy range of 10¹²-10¹⁵ eV (electron-volts*), cosmic rays arriving at the edge of the Earth's atmosphere have been measured to consist of... continue history with "Introduction To Cosmic Rays"