1. Univ. of Michigan (United States)
2. Australian National Univ. (Australia)
3. Univ. of Exeter (United Kingdom)
4. Georgia State Univ. (United States)
5. New Mexico Institute of Mining and Technology (United States)
6. Univ. of California, Berkeley (United States)
7. Rice Univ. (United States)
8. European Southern Observatory (Chile)
9. Univ. of Chile (Chile)
10. Univ. of Jena (Germany)
11. Seabrook Engineering (United States)
12. Univ. of Nice (France)
13. NASA Goddard Space Flight Ctr. (United States)
14. Jet Propulsion Lab. (United States)
15. Univ. of Cambridge (United Kingdom)
16. Princeton Univ. (United States)