It's the season finale - so we've crammed in 3 interviews with 3 superstars!Dr Steve Hancock is working on NASA's GEDI mission from Edinburgh with the University of MarylandVladimir Ivan is working with the only NASA humanoid robot outside the US, Valkyrie, to simulate life on Marsand David Alexander OBE joins us from Houston, Texas where the Glaswegian Professor of Astrophysics is the director of the Rice Space InstituteAs always, Dr Murray Collins and journalist Kim McAllister present the programme in their irreverent style - this week Kim educates Murray about the importance of Irn Bru and why he should wear a swimming pool noodle on his head.Drop them a line on Twitter @murraybcollins and @kimmcallisterCheck out the websites:ed.ac.uked.ac.uk/bayes

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