Summary: Einstein's theories of relativity transformed our understanding of the Universe. The twin theories of Special and General Relativity offered insights into the nature of space, time and gravitation which changed the face of modern science. It's regarded today as one of the greatest intellectual achievements of the 20th century, and had an impact far beyond the world of science. Melvyn Bragg is joined by Ruth Gregory, Professor of Mathematics and Physics at Durham University; Martin Rees, Astronomer Royal and Emeritus Professor of Cosmology and Astrophysics at the University of Cambridge and Roger Penrose, Emeritus Rouse Ball Professor of Mathematics at the University of Oxford.
