What rays from space are called cosmic rays?

Cosmic rays are streams of particles moving towards the Earth from space. Their composition: 90% – protons, 7% – a-particles,. 1% – electrons and more than one percent – nuclei of heavy elements. There is one such particle in space near the Earth in one cubic centimeter. Among the corpuscles of cosmic rays, there are particles with enormous energy – up to 10 GeV. Cosmic rays are formed on the Sun and other stars, during supernova explosions, as well as in the center of the Galaxy.

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