 Gravitational waves have the potential to unlock so many secrets of the universe and perhaps most excitingly of all, going back to the beginning of time at the start of the universe and the Big Bang. 100 years ago, Einstein presented his miraculous theory of general relativity and one of its greatest prediction, gravitational waves, has been a holy grail of scientists for the last 100 years. We build the most exquisite instrument on Earth with a large scale project involving a thousand scientists and many billions of dollars and a year ago we announced the first detection of gravitational waves from a binary black hole system, a cataclysmic event in space. This time we detected the collision of two very dense stars called neutron stars. These are the densest type of stars that we know of. With this discovery we have the opportunity to learn so much more about neutron stars which have been quite a mystery to us. Unlike black holes, they give off other signals as well in the electromagnetic spectrum and following this detection, our astronomy partners searched that region of sky for these counterpart detections. So SkyMapper was on that source, on that event as soon as night fell over Australia and it was the first telescope to report the colours of the fireball that we saw emanating from that explosion. And it was much hotter than what we expected from previous calculations which is interesting because we can now really learn about what neutron stars are like and how these collisions happen. So we think that these neutron star collisions are the sites where rare heavy precious metals like gold and platinum and other exotic materials are formed and many of those materials we find on Earth today probably were formed in a neutron star collision way before the Earth formed itself.