When Two Stars Collide Brian Cox and Robin Ince are joined on stage by comedian Dara O'Briain, Professor Sheila Rowan of Glasgow University and Professor Nils Andersson of Southampton University to look at last summer's spectacular discovery of gravitational waves from two colliding neutron stars. The observation of this huge cosmic event not only confirmed one of Einstein's great predictions, some 100 years ago, but also revealed the source of gold in our universe. Brian, Robin and guests look at how this momentous discovery brought together nearly 1/3 of the world's astronomers and astrophysicists as they raced to point their telescopes at the collision, but also confirmed the presence of gravitational waves, first predicted in Einstein's theory of general relativity back in 1915. They also discover why the source of our heavier elements such as gold and platinum has been so difficult to prove, until now. Producer: Alexandra Feachem The Infinite Monkey Cage book "How to Build A Universe (Part 1)" is out now and available to buy from all the usual places.