Dr Melvyn Davies and Dr Stephan Rosswog from
Leicester University explain how heavy metals such as gold, platinum and uranium came to be present on earth. With the help of a supercomputer, they have calculated that gold is formed when neutron stars collide. But the calculations are enormously complex. How sure are the physicists that they have got it right? Quentin Cooper investigates.
Producer John Watkins. E-MAIL: material.world@bbc.co.uk Doctor Digital: page 22