00:45:00In his talk "Black Holes, Alien Life, Dark Matter, and the Big Bang," Professor Martin Rees discusses the possible existence of intelligent alien life and the implications of this on our understanding of evolution. He argues that while the practical case for human spaceflight is getting weaker, the cost of doing so should not be borne by taxpayers, as it is too risky for civilians. He also notes that, as robots get better and more capable, human spaceflight has less and less practical purpose.