Cosmic rays are energetic charged subatomic particles, originating from outer space, that impinge on Earth's atmosphere. They may produce secondary particles that may penetrate to the Earth's surface, and deeper. Cosmic rays are the same particles that are stable (nonradioactive) components of the types of atoms that normally occur on Earth, i.e. protons, atomic nuclei, or electrons. Cosmic rays thus resemble the particles that circulate inside particle accelerators, although cosmic ray energies may be far higher (see below). The term ray comes from the early days of radiation research, when a directed stream of any ionizing radiation was termed a "ray" (example, alpha rays).
Lee Spacey - Cosmic Rays by Lee_Spacey
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