Black Holes. What are they and how are they formed? We will distinguish between black holes that are produced by core-collapse supernova, and black holes that exist at centers of galaxies. Our sun will not turn into a supernova at the end of its life-cycle, but will instead become a carbon white dwarf. The life stages and fates of stars of different sizes will be discussed, as well as the processes involved when and after big stars go supernova. Guess what? Well also talk about aspects of relatively associated with black holes, and things like event horizons and space-time.