A century after their discovery, the origin of cosmic rays remains one of the most enduring mysteries in physics. They can have energies that exceed 1020 eV, a

Abstract Gamma-ray bursts (GRBs) are the most luminous transient events in the observed Universe. However, there is no direct observational evidence for what ex

We will review the scientific case for neutrino astronomy. It has been made since the 1950's by pioneers who realized that, of all high-energy particles, only n