The alpha particles they are nuclear particles that have a positive charge formed by a helium nucleus, that is, two protons and two neutrons.
Alpha particles are formed during nuclear processes that take place inside the stars. They also constitute one of the components of cosmic rays and solar wind.
Alpha particles are emitted spontaneously in some types of radioactive decay. They correspond to fully ionized helium 4 atoms.
The flow of particles called "cosmic rays", mostly from our Galaxy, consists of 90% protons, 9% alpha particles and the rest are heavier nuclei than hydrogen.
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