March 12th, 2015
Episode 441 of 533 episodes
Dark matter is the mysterious and invisible substance which is believed to make up most of the Universe. In the 1930s scientists noticed that the speed at which galaxies moved was at odds with the amount of material they appeared to contain. They hypothesized that much of this 'missing' matter was simply invisible to telescopes. Today astronomers and particle physicists are still fascinated by the search for dark matter and the question of what it is. Melvyn Bragg is joined by Carolin Crawford, Public Astronomer at the Institute of Astronomy, University of Cambridge and Gresham Professor of Astronomy; Carlos Frenk, Ogden Professor of Fundamental Physics and Director of the Institute for Computational Cosmology at the University of Durham and Anne Green, Reader in Physics at the University of Nottingham.