Hao Cao, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States, Michele Karen Dougherty, Imperial College, London, United Kingdom, Gregory James Hunt, University of Leicester, Department of Physics and Astronomy, Leicester, United Kingdom, Gabrielle Provan, University of Leicester, Physics and Astronomy, Leicester, LE1, United Kingdom, Stanley W H Cowley, University of Leicester, Physics and Astronomy, Leicester, United Kingdom and David J Stevenson, California Institute of Technology, Pasadena, CA, United States