Ahmed Alhantoobi, Abu Dhabi, United Arab Emirates, Jennifer Buz, California Institute of Technology, Pasadena, CA, United States, Joseph G O'Rourke, Arizona State University, Tempe, AZ, United States, Christopher S Edwards, Northern Arizona University, Astronomy and Planetary Science, Flagstaff, AZ, United States and Benoit Langlais, Lab Planetologie Geodynamique, Nantes, France