Black holes are the most enigmatic and exotic objects in the universe. Watch the prologue of "Black Hole Apocalypse," a two-hour NOVA special premiering January 10 at 9/8c on PBS, hosted by astrophysicist and author Janna Levin: http://to.pbs.org/2pWRPL6 | NOVA l PBS

The discovery of black holes was an accident. Here's the story of how a young astronomer stumbled across the phenomenon: | NOVA l PBS