cosmic ray observations are more challenging than many other forms of astronomy.
Due to their varying origins, they carry a variety of energies, which is called the cosmic ray spectrum.
|cosmic ray |
A ray of radiation of extraterrestrial origin, consisting of one or more charged particles such as protons, alpha particles, and larger atomic nuclei. Cosmic rays entering the atmosphere collide with atoms, producing secondary radiation, such as pions, muons, electrons, and gamma rays. Cosmic rays (and secondary radiation) can be easily seen in a cloud chamber.