In a first for the Space Boffins podcast - an interview with astronauts in space! NASA's Scott Kelly and cosmonaut Mikhail Kornienko are on a year long mission on board the International Space Station. They took time out from their duties to discuss how they're getting on so far. Studio guests space scientists Lucie Green and Graziella Branduardi-Raymont add some sun (shine) and a SMILE (mission) to the proceedings. Plus we talk to the first man to walk in space, Alexei Leonov, ahead of a new cosmonaut exhibition at London's Science Museum.