Linked from
The 44 pages that link to Cosmic ray, each with the reason it gives.
HadronRelated: Cosmic-ray collisions in the atmosphere generate extensive showers of hadrons.
Charged particleRelated: Most cosmic rays are charged, so magnetic fields alter their paths.
Galactic windRelated: Their pressure can help accelerate gas out of a galaxy.
KaonRelated: Early kaon discoveries came from particle tracks in cosmic-ray experiments.
Robert MillikanRelated: Millikan studied their origins and promoted the name “cosmic rays.”
Aerobee rocketRelated: Aerobee flights measured cosmic rays above much of the atmospheric shielding.