Chris Riley discovers that, rather than being a hazard, black holes may be an essential part of our universe. Meanwhile, Kathy Sykes meets a man who designs prisms for the world's largest telescopes. Show more
Discover 11,128,835 listings and 280,249 playable programmes from the BBC
Chris Riley discovers that, rather than being a hazard, black holes may be an essential part of our universe. Meanwhile, Kathy Sykes meets a man who designs prisms for the world's largest telescopes. Show more