Cosmic rays are high-speed atomic nuclei (protons and heavier nuclei) as well as electrons and positrons. They are accelerated to extreme energies, often by violent astrophysical events such as supernova explosions and black holes. They can also produce secondary particles such as gamma rays and muons when they collide with atoms in the Earth's atmosphere.

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Cosmic Rays Are

Question 23

Multiple Choice

Cosmic rays are

A) high-energy electro-magnetic radiation
B) fast-moving dust grains
C) neutrinos of various types
D) highly reddened light emerging from dust clouds
E) high-speed atomic nuclei, electrons, and positrons

Correct Answer: