Twenty years after A Brief History of Time became an unlikely global bestseller, Professor Stephen Hawking takes viewers on a journey through the universe to explore the mysteries of physics, and looks at how far our understanding of the universe has developed.

Professor Stephen Hawking takes viewers on a journey through the universe to explore the mysteries of physics, and looks at how far our understanding of the universe has developed. The second program explores the cutting edge of physics, such as String Theory and Supersymmetry, which have seen extra dimensions and multiverses move into the mainstream of scientific debate.