A wide range of topics are covered, ranging from supernovae to active galactic nuclei, cosmic gamma rays to neutrinos and dark matter. The basic emphasis is on physics / astrophysics and experimental / observational techniques, scientific implications of current results, and prospects for future advances. The fields surveyed are in rapid development and the exploration of our high energy universe is proceeding rapidly, with exciting new discoveries. What unifies much of the new data is the idea of particle acceleration to enormous energies and the subsequent interactions of the particles with the local medium. It this focus that makes the book both timely and an important contribution to the field.Proceedings of the NATO Advanced Study Institute and 12th Course of the International School of Cosmic Ray Astrophysics, held in Erice, Italy, 10-12 November 2000A wide range of topics are covered, ranging from supernovae to active galactic nuclei, cosmic gamma rays to neutrinos and dark matter. The basic emphasis is on physics / astrophysics and experimental / observational techniques, scientific implications of current results, and prospects for future advances. The fields surveyed are in rapid development and the exploration of our high energy universe is proceeding rapidly, with exciting new discoveries. What unifies much of the new data is the idea of particle acceleration to enormous energies and the subsequent interactions of the particles with the local medium. It this focus that makes the book both timely and an important contribution to the field.Preface; M.M. Shapiro. I: High Energy Processes. Theory of Cosmic Ray and High-Energy Gamma-Ray Production in Supernova Remnants; E.G. Berezhko. Hadronic Collisions at Very High Energies; I. Kurp. Electron Acceleration by Quasi-Parallel Shock Waves; Y. Uvarov. Magnetohydrodynamic wind Driven by Cosmic Rays in a Rotating Galaxy; V.N. Zirakashvili, et al. II: Sources in our Galaxy. Supernovae, SlS™