high-energy-astrophysics

What cosmic rays are, how Victor Hess discovered them in 1912, their sources from the Sun to AGN, detection methods, biological effects, and the ultra-high-energy mystery.

Cosmic rays are atomic nuclei and subatomic particles accelerated to extraordinary energies by the most violent events in the universe. Some arrive with energies exceeding anything a particle accelerator can produce, yet their sources remain one of astrophysics' great unsolved mysteries.