Explore the fascinating world of black holes in this comprehensive 30-minute video series. Delve into the nature of black holes, their infinite density, and the structure of both inactive and active black holes. Learn about the photon sphere, the concept of spaghettification, and how an astronaut's weight would change at the event horizon. Discover methods for detecting black holes and examine supermassive black holes at the center of the Milky Way and in the Virgo Cluster. Gain a deeper understanding of these mysterious cosmic phenomena through clear explanations and diagrams.