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Professor Stephen Hawking delivers the first of his two 麻豆社 Reith Lectures on black holes. These collapsed stars challenge the very nature of space and time, as they contain a singularity - a phenomenon where the normal rules of the universe break down. They have held an enduring fascination for Professor Hawking throughout his life.

Rather than see them as a scary, destructive and dark he says if properly understood, they could unlock the deepest secrets of the cosmos. Professor Hawking describes the history of scientific thinking about black holes, and explains how they have posed tough challenges to conventional understanding of the laws which govern the universe. The programmes are recorded in front of an audience of 麻豆社 Radio 4 listeners and some of the country's leading scientists at the Royal Institution of Great Britain in London.

Sue Lawley introduces the evening and chairs a question-and-answer session with professor Hawking. 麻豆社 Radio 4 listeners submitted questions in their hundreds, of which a selection were invited to attend the event to put their questions in person to professor Hawking.