This course will introduce you to the physical principles describing galaxies and the composition and evolution of the Universe.  We will cover a wide range of topics from nearby galaxies to quasars to the Big Bang.The goals of the course are 1) to introduce you to the broad sweep of extragalactic astronomy and cosmology, including major concepts and common jargon, 2) to develop detailed applications of physics, particularly mechanics, to galaxies and cosmology, 3) to gain exploratory experience in observational astronomy.