Heather Graham, university researcher, was quoted in a Chemical & Engineering News story on chemical signs of life beyond earth.
...“By and large, what we do in biosignature science is chemistry,” says Heather Graham, an organic geochemist at the Catholic University of America and NASA’s Goddard Space Flight Center. Biosignatures can be fossilized cells or active microbial communities. But they can also be molecules that are made only by living organisms. These biosignatures are molecules that would be out of place in a planet’s geochemistry if it were not for some living organism churning them out...
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