John Clinton¹, Domenico Giardini², William Bruce Banerdt³, Donald J Banfield⁴, Maren Böse², Savas Ceylan², Constantinos Charalambous⁵, Martin van Driel⁶, Fabian Euchner², Raphael Garcia⁷, Anna C Horleston⁸, Taichi Kawamura⁹, Sharon Kedar¹⁰, Amir Khan², Philippe Henri Lognonné¹¹, Guenolé Orhand-Mainsant¹², Mark P Panning¹³, William T Pike⁵, John-Robert Scholz¹⁴, Suzanne E Smrekar¹⁵, Aymeric Spiga¹⁶ and Simon C Staehler¹⁷, (1)Ottikon, Switzerland, (2)ETH Zurich, Zurich, Switzerland, (3)Jet Propulsion Laboratory, Pasadena, CA, United States, (4)Cornell University, Center for Radiophysics and Space Research, Ithaca, NY, United States, (5)Imperial College London, London, SW7, United Kingdom, (6)ETH Zurich, Department of Earth Sciences, Institute of Geophysics, Zurich, Switzerland, (7)Institut Supérieur de l'Aéronautique et de l'Espace, SSPA/DEOS, Toulouse Cedex 04, France, (8)University of Bristol, Bristol, United Kingdom, (9)Université de Paris, Institut de physique du globe de Paris, Paris, France, (10)JPL, Pasadena, CA, United States, (11)Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France, (12)Institut Supérieur de l'Aéronautique et de l'Espace, Toulouse Cedex 04, France, (13)Univ of FL-Geological Sciences, Gainesville, FL, United States, (14)Max Planck Institute for Solar System Research, Göttingen, Germany, (15)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (16)Sorbonne Université, Campus Pierre et Marie Curie, Paris, France, (17)ETH Zurich, Institute of Geophysics, Zurich, Switzerland