1. Department of Earth and Environmental Sciences Michigan State University East Lansing MI 48824 USA
2. Department of Biology University of Utah Salt Lake City UT 84112 USA
3. Department of Microbiology and Molecular Genetics Michigan State University East Lansing MI 48824 USA
4. Laboratory for Atmospheric and Space Physics UCB 600, University of Colorado‐Boulder Boulder CO 80309 USA
5. Exobiology Branch NASA Ames Research Center Moffett Field CA 94035 USA
6. SETI Institute Mountain View CA 94043 USA
7. Department of Geosciences University of Rhode Island Kingston RI 02881 USA