Lecture, three hours; discussion, one hour. Requisites: Physics 17, 110A, 115A. Corequisites: Physics 110B, 115B. Designed for upper-division Astrophysics and Physics majors. Introduction to high-energy universe, with overview of sources of high energy (X-ray and gamma-ray) emission. Covers importance of energetic particles in galaxy and connection of high-energy astronomy to cosmology and particle physics. P/NP or letter grading.