Matthew Sweet debates how the discovery of alien life might change the way we think about humanity and how it will impact our moral and philosophical universe. Matthew is joined by the best-selling science-fiction writer Stephen Baxter, the science broadcaster and journalist Sue Nelson, the futurist and neuroscientist Anders Sandberg, and one of our leading space scientists, John Zarnecki, Professor of Space Science at the Open University. This event was recorded as part of Radio 3's Free Thinking Festival at The Sage Gateshead on Sunday 4th November 2012.