Summary: Space Boffins Sue Nelson and Richard Hollingham are joined by the BBC's Jon Amos and ExoMars' Andrew Coates. They look ahead at the most exciting missions of 2015 so expect New Horizons, Ceres and Tim Peake's forthcoming trip to the space station. There's also interviews with UrtheCast's Scott Larson and Gaia's Timo Prusti.
