Trawling the Puget Sound to Trace the Evolutionary History of Invertebrate Organisms Oct 18, 2019 A dissected bivalve as seen under the microscope. fieldwork Samantha Gilbert (she/her/hers) PhD student in Astronomy/Astrobiology I am studying how we can best interpret exoplanet biosignatures using spectra from future instruments. Related Measuring Reflectivity of Microbial Mats in Yellowstone National Park