NASA’s Water-Hunting Tool Will Help Scout Moon’s South Pole
NASA is advancing a new water‑hunting instrument called the Neutron Spectrometer System (NSS) that will help map near‑surface hydrogen deposits at the Moon’s south pole to guide future crewed missions. The tool is being prepared for integration on lunar landers slated to fly during the Artemis campaign, where NSS measurements will refine understanding of water‑ice distribution and usable hydrogen‑bearing materials in permanently shadowed regions near the lunar south pole. By characterizing the abundance and depth of hydrogen in the regolith, the instrument could inform landing site selection and support plans for in‑situ resource utilisation that reduce reliance on supplies from Earth.
The Neutron Spectrometer System detects variations in neutron flux emitted from the lunar surface when cosmic rays interact with hydrogen atoms, allowing the instrument to infer the presence and concentration of water or hydrogen‑rich compounds. NSS operates by measuring changes in neutron energies that indicate hydrogen abundance within approximately one meter of the surface, offering a more direct probe of potential water‑ice reservoirs than previous orbital neutron detectors. The data collected will supplement other sensors and orbital recon data to build high‑resolution maps of hydrogen distribution across the south polar region, where permanently shadowed areas have long been known to harbour volatile deposits.
Developing accurate hydrogen maps is central to NASA’s broader Artemis objectives of establishing a sustainable presence on the Moon and testing technologies for deeper exploration including Mars missions. Identifying accessible water‑ice could enable astronauts to produce drinking water, breathable oxygen, and rocket propellant on site, lowering mission costs and logistical complexity. The NSS development underscores the agency’s focus on resource prospecting as a foundational capability for long‑duration lunar operations, building on decades of lunar science while preparing for future human exploration beyond low Earth orbit.
