1. Jet Propulsion LaboratoryCalifornia Institute of Technology Pasadena CA USA
2. Astrophysical & Planetary Sciences DepartmentUniversity of Colorado Boulder Boulder CO USA
3. Planetary Science Institute Tucson AZ USA
4. Department of Earth SciencesUniversity of Toronto Toronto Ontario Canada
5. Earth, Planetary, and Space SciencesUniversity of California Los Angeles CA USA
6. Space Science Institute Boulder CO USA
7. Deceased June 13, 2019
8. Department of Geology and GeophysicsUniversity of Hawai'i at Manoa Honolulu HI