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High Energy Particles from the Universe

The field of high energy particle astronomy is exciting and rapidly developing. In the last few years, we have detected extragalactic sources of intense TeV gamma radiation and individual cosmic ray particles with energies exceeding 25 Joules. Understanding the workings of astrophysics under extreme conditions is the primary goal of this field. Also important is the possibility of using high energy particles from space to probe beyond the standard models of particle physics and cosmology. This paper presents a review of high energy particle astronomy using photons, cosmic rays, and neutrinos.