The Department of Astronomy offers undergraduate and graduate instruction in a wide variety of fields, including theoretical and observational astrophysics; infrared, optical, and radio astronomy; galactic structure and dynamics of stellar systems; high-energy astrophysics and cosmology; and spectroscopy. A considerable amount of research and teaching related to astronomy is done in other units at Berkeley, including the Space Science Laboratory, Lawrence Berkeley Laboratory, and the Physics Department. Various professors in the Chemistry, Earth and Planetary Science, Mathematics, Statistics, and Engineering departments have an active interest in astronomy and are available for consultation.