James Cronin

James Cronin (2010) - Cosmic Rays: The Most Energetic Particles in the Universe

Astrophysical objects are able to accelerate atomic nuclei to energies 10^7 times more than man made accelerators such as LHC. Particles arrive at earth from space with energies as great as 50 joules, a macroscopic energy in a microscopic particle. It is not understood how nature can accelerate particles to such energies