Permanently shadowed regions (PSRs) are areas on planetary bodies, such as the Moon and Mercury, that never receive direct sunlight due to their location near the poles and steep topography. These regions are of particular interest to scientists because they are believed to contain deposits of water ice, which could potentially be used as a resource for future human exploration missions. Researchers study PSRs using a combination of remote sensing techniques, modeling, and in situ exploration to better understand their composition and potential as a valuable resource for future space exploration.