Lecture, three hours; discussion, one hour. Requisites: course 81, Mathematics 31A, 31B, and Physics 1A or 1AH. Open to qualified sophomore and upper-division students. Introduction of principles important for understanding components and evolution of Milky Way galaxy. Topics include interstellar medium, star and planet formation, and exoplanets. Examination of basic physical processes governing compact stellar remnants such as white dwarfs, neutron stars, and black holes. Overview of structure and properties of Milky Way galaxy. P/NP or letter grading.