European Space Agency reserve astronauts John McFall and Meganne Christian join Space Boffins Sue Nelson and Richard Hollingham to discuss their latest training, a new private space station mission and crossing the Atlantic in winter. And, as the joint ESA and Japanese Bepi-Colombo spacecraft prepares to arrive at Mercury, they meet mission project scientist Geraint Jones to discuss this ambitious mission. Like this podcast? Please help us by supporting the Naked Scientists