Marisa Hayley Mayer, Stanford University, Stanford, CA, United States, Mary N. Parenteau, NASA Ames Research Center, Moffett Field, CA, United States, Linda L Jahnke, NASA Ames, Moffett Field, CA, United States, Michael Thomas Madigan, Southern Illinois University Carbondale, Microbiology, Carbondale, IL, United States and Paula V Welander, Stanford University, Earth System Science, Stanford, CA, United States