NASA has launched a comprehensive testing program to understand the physical interactions between spacecraft engine plumes and lunar surface material, a critical safety concern for both crewed and robotic moon missions.
The agency's plume-surface interaction tests examine what happens when descent engines fire near the regolith during landing sequences. This phenomenon poses multiple hazards. Engine exhaust can excavate loose lunar soil, creating craters and ejecting abrasive particles at high velocity. Those particles can damage sensitive spacecraft systems, degrade solar panels, compromise landing gear, and reduce visibility for pilots or autonomous guidance systems. For crewed missions like NASA's Artemis program, plume-induced dust clouds could interfere with crew safety during extravehicular activity and equipment deployment.
NASA and its commercial partners need empirical data to design safer landing systems and predict surface behavior during touchdown. The agency has constructed specialized test facilities to simulate lunar conditions and measure plume dynamics, surface erosion patterns, and particle behavior during engine firing.
Recent testing phases have produced video documentation and high-resolution imagery showing dust plume development, crater formation, and particle trajectories. These visuals provide the first detailed observations of engine-regolith interactions under controlled conditions. The data informs computer models that engineers will use to predict landing hazards at specific lunar sites targeted by Artemis missions and commercial lunar landers.
The expanded testing program includes new phases designed to evaluate different engine types, thrust levels, and regolith compositions. Engineers test both conventional chemical rocket engines and emerging propulsion systems that commercial providers might use. Each configuration produces different plume characteristics and surface responses. By varying soil properties and moisture content, researchers establish how diverse lunar terrain will react to landing activities.
This work directly supports Artemis III and IV missions, which will land astronauts at the lunar south polar region near Shackleton Crater. That terrain presents extreme challenges. Permanently shadowed craters harbor water ice but create navigation difficulties and dust hazard uncertainties. Understanding plume-surface physics allows mission planners to select safer landing zones and design spacecraft with appropriate protections.
Commercial lunar lander providers including Intuitive Machines, Firefly Aerospace, and Astrobotic also benefit from this research. These companies operate under NASA's Commercial Lunar Payload Services program, which delivers scientific instruments and cargo to the moon. Their vehicles must land safely to fulfill contract obligations. NASA's testing reduces their development risk by providing validated models and empirical baselines.
The plume-surface interaction program extends beyond dust hazards. Crater formation and regolith mobilization affect surface sample collection, equipment placement, and future infrastructure development. Understanding these processes helps NASA plan for sustained lunar operations, including fuel depots, habitation modules, and resource extraction facilities that future moon bases will require.
By August 2026, the testing program had progressed through multiple phases with documented success. Continued testing will expand the database of plume-surface behaviors across different lunar environments, enabling safer, more efficient moon landings throughout the coming decades of exploration.