The Great Courses “Black Holes Explained" is a 2-DVD disc set with a course guidebook, offering a comprehensive exploration of the fascinating world of black holes. Produced by The Great Courses in 2009, this educational box set delves into the science and mathematics of astronomy, making it a valuable resource for those interested in the mysteries of black holes. With expert insights and engaging content, this DVD set is perfect for anyone looking to deepen their understanding of these fascinating celestial phenomena. It is a new unopened box set. There is a small tear in the plastic on the spine. Other than that, it is in excellent condition. LRS1