1. NASA Astrobiology Institute, California Institute of Technology, Pasadena, California.
2. European Space Agency.
3. Institut d’Astrophysique de Paris, Paris, France.
4. Spitzer Science Center, California Institute of Technology, Pasadena, California.
5. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California.
6. NASA Goddard Institute for Space Studies, New York, New York.
7. Carnegie Institution of Washington, Washington, DC.