Exploring Black Holes: General Relativity & Astrophysics Links (videos): OCW (RealPlayer), iTunes, YouTube Links (additional): Course Home Page Review: This is an interesting series of lectures that cover different aspects of Astrophysics and Cosmology. There are a number of guest lecturers presenting different subjects, all with the apparent goal of being a first introduction of those subjects. Please note that the YouTube version does not have all the videos at this time. Donations/Home Pages: MIT OpenCourseWare