Christina Cohen, Caltech, Pasadena, CA, United States, Joe Giacalone, University of Arizona, Tucson, AZ, United States, Timothy B Guild, The Aerospace Corporation, Chantilly, VA, United States, Delores J Knipp, University of Colorado, Boulder, CO, United States, Therese Moretto, University of Bergen, Bergen, Norway and Juan V Rodriguez, University of Colorado Boulder, Boulder, CO, United States