1. Department of Biology, Georgetown University, Washington, District of Columbia.
2. Program on Science, Technology, and International Affairs, Georgetown University, Washington, District of Columbia.
3. NASA Goddard Space Flight Center, Greenbelt, Maryland.
4. Department of Geology and Geography, West Virginia University, Morgantown, West Virginia.
5. Department of Geological Sciences, University of Florida, Gainesville, Florida.
6. Center for Research and Exploration in Space Sciences and Technology/University of Maryland College Park, College Park, Maryland.