What rays are called cosmic rays?

Cosmic rays are streams of particles moving towards the Earth from space. Their composition. 90% are protons, 7% are alpha particles, 1% are electrons and more than 1% are nuclei of heavy elements. There is one such particle in the space around the Earth in 1 cm3. Among the corpuscles of cosmic rays, there are particles with tremendous energy – up to 10 GeV. Cosmic rays are formed on the Sun and other stars, during supernova explosions, and in the center of the Galaxy.

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