Abstract
Was there life on Mars? If so, microorganisms would have left chemical signatures in martian rocks, as they have done here on Earth. Astrobiologist Sherry Cady of Pacific Northwest National Laboratory is helping Mars mission teams from the National Aeronautics & Space Administration decide where to search for fossilized evidence of life on the red planet. As a member of the SETI Institute team that is part of the NASA Astrobiology Institute, she studies Earth environments that are analogs for potential ecosystems on Mars, including hot springs, deserts, and the remains of ancient lakes. She talked with Deirdre Lockwood about how these extreme environments inform the search for life in outer space. How did you first get interested in this field? During my postdoc at NASA’s Ames Research Center, they sent me out to Yellowstone National Park in Wyoming to look at high-temperature geological formations at the hot springs. These
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