Dr. Hanna Sizemore is a senior scientist at the Planetary Science Institute, based in Marlinton, West Virginia, where she studies the history and mobility of ice in regoliths. She studies ground ice on Mars, through numerical simulations of ice stability, numerical simulations of thin film migration, and through laboratory investigations of ices and Mars-analog soils. She is a guest investigator on the Dawn mission to dwarf planet Ceres. Follow the Planetary Science Institute @planetarysci.