The Odds of Finding Water on Mars

• Locating subsurface water on Mars is critical for In Situ Resource Utilization (ISRU), allowing crews to generate oxygen, drinking water, and propellant locally.
• Mars presents a geographical dilemma: the poles have ice but insufficient solar energy, while the equator has energy but no surface ice.
• Researchers are focusing on mid-latitudes to identify viable landing zones, despite historical mapping discrepancies.

Research and Methodology

• Hanna Sizemore and Samuel Courville (Planetary Science Institute) used data from the SWIM project, which detects buried ice by measuring thermal rhythms in the soil.
• Sizemore’s team compared three independent maps to identify areas of broad agreement and highlight regions of uncertainty that require further robotic exploration.
• Courville’s team converted indirect data into probability statistics, providing mission planners with concrete percentage-based confidence levels for finding water.

Limitations and Future Needs

• Current methods are limited to reading the top meter of ground, while radar handles depths beyond five meters.
• A critical gap exists between one and five meters—the range most feasible for human excavation—which no current instrument can accurately map.
• Closing this gap will require the development and deployment of high-frequency radar technology not yet flown on Martian missions.