What are cosmic rays, why do they not move in a straight line in interstellar space?

Cosmic rays are elementary particles and nuclei of various atoms moving in outer space at speeds close to the speed of light. The magnetic induction of the interstellar magnetic field is small, but nevertheless the interstellar medium is weakly magnetized; therefore, cosmic rays in interstellar space do not move in a straight line, interacting with the magnetic field.

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