Students Test Prototype Landing Pad to Make Lunar Operations Safe
When spacecraft perform vertical landing and takeoff maneuvers from the lunar surface, the results can be extraordinarily disruptive — and potentially dangerous. Beyond the intense thermal energy produced by rocket engines, the mechanical force of exhaust plumes kicks up regolith, the fine-grained particulate dust that blankets most of the Moon's surface to depths of several meters. Unlike Earth's relatively coarse soils, lunar regolith is composed of razor-sharp, glassy shards formed over billions of years by micrometeorite impacts and solar wind bombardment — a property that makes it uniquely hazardous to equipment, vehicles, and human health alike.
With an ambitious slate of crewed and cargo missions planned under NASA's Artemis Program, space agencies and their commercial partners are now grappling seriously with the challenge of building durable, safe surface infrastructure on the Moon. Central to that effort is the development of landing pads — engineered surfaces capable of protecting spacecraft, astronauts, and surrounding equipment from the punishing effects of repeated vertical takeoff and landing (VTOL) operations.
The Regolith Problem: Why Lunar Dust Is So Dangerous
To appreciate why landing pads are so critical, one must understand the unique physics of the lunar environment. On Earth, our planet's dense atmosphere acts as a natural buffer, slowing and dispersing rocket exhaust plumes before they can interact violently with the ground. The Moon, however, is an airless body — it possesses no appreciable atmosphere to dampen these forces. In this near-perfect vacuum, rocket exhaust gases expand freely and at high velocity, transferring enormous kinetic energy to the loose regolith surface beneath.
Studies of NASA's Apollo missions in the 1960s and 1970s first revealed the full extent of the problem. Astronauts and mission planners documented how even the relatively modest descent engines of the Apollo Lunar Module sandblasted nearby equipment and left visible scour marks on the surface. With the far more powerful engines planned for future human landers — vehicles that must carry significantly more mass — the scale of sandblasting ejecta will be proportionally greater.
The consequences extend far beyond a single landing site. Because the Moon lacks an atmosphere to confine or slow particles, dust clouds caused by rocket plumes can travel extraordinary distances — in some models, ejecta can be lofted into ballistic trajectories that carry them across the entire lunar hemisphere. At speed, these particles can:
- Abrade and degrade solar panels, reducing power generation efficiency
- Contaminate optical sensors, cameras, and scientific instruments
- Penetrate habitat seals and mechanical joints, compromising structural integrity
- Pose inhalation hazards to astronauts if tracked inside pressurized environments
- Interfere with orbiting satellites and incoming spacecraft if dust is lofted into low lunar orbit
The electrostatic properties of lunar regolith compound the problem further. Exposed to constant ultraviolet radiation and charged particle bombardment from the solar wind, lunar dust grains become electrostatically charged, causing them to cling aggressively to nearly every surface they contact — a property that plagued Apollo astronauts and remains one of the most persistent engineering challenges for sustained lunar operations.
Engineering a Solution: UAH's Modular, Vented Landing Pad
To address these challenges, NASA has enlisted engineering teams from the University of Alabama in Huntsville (UAH) as part of a multi-year partnership with Linc Research Inc., a certified engineering company based in Huntsville, Alabama. The collaboration is funded through NASA's Small Business Technology Transfer (STTR) program, which connects small commercial enterprises with university research capabilities to advance technologies with direct space exploration applications.
The student research team is led by Dr. Judy Schneider, a professor in UAH's Department of Mechanical and Aerospace Engineering. Their mandate: design a modular, vented landing pad system capable of safely managing rocket exhaust on the lunar surface — without relying on the water-cooled infrastructure that makes Earth-based launch facilities workable.
"On Earth, we use water-cooled flame buckets to redirect rocket exhaust. But we won't have those resources on the lunar surface, where water will be in limited supply. Our goal is to redirect the rocket plume so it doesn't damage the landing vehicle or any surrounding structures. The hot-fire tests demonstrated that we could redirect the rocket plume. By using an internally vented structure, we were able to prevent the heat from damaging the pad as it could in a solid structure."
— Dr. Judy Schneider, UAH Department of Mechanical and Aerospace Engineering
The key innovation in the UAH design lies in its integrated vent system. Rather than simply placing a solid, heat-resistant slab beneath the rocket — an approach that concentrates thermal and mechanical stress and can lead to catastrophic structural failure, as dramatically illustrated by the first launch attempt of SpaceX's Starship, which cratered the launch mount and sent concrete debris flying across the facility — the UAH team's approach uses interlocking modular components with internal channels. These channels actively capture rocket exhaust and redirect it away from the spacecraft and surrounding infrastructure, distributing thermal and mechanical loads across the entire pad structure rather than concentrating them at a single point.
Hot-Fire Testing at UAH's Propulsion Research Center
This past summer, the team reached a significant milestone by successfully completing three rocket-motor firing tests on a prototype landing pad at UAH's Propulsion Research Center. For the tests, individual concrete components were fabricated and arranged into a prototype measuring 3.65 meters (12 feet) in diameter. Each component was embedded with integrated sensors to record temperature distributions, pressure gradients, and flow dynamics as rocket exhaust was channeled through the vent system during each firing sequence.
The choice of concrete as a construction material for the prototype was deliberate and scientifically meaningful. Concrete serves as a terrestrial analog for two categories of building materials that could realistically be manufactured from lunar regolith using In-Situ Resource Utilization (ISRU) techniques:
- Sintered regolith ceramics — produced by heating lunar soil to high temperatures, fusing particles into a solid, durable mass that can be shaped through 3D printing or casting processes
- Lunacrete — a lunar analog to conventional concrete, in which regolith particles are bound together using chemical bonding agents, potentially derived from materials found on or near the lunar surface
Both approaches align with the broader strategic goal of minimizing the mass of construction materials that must be launched from Earth — a critical economic and logistical consideration, given that delivering even a single kilogram of payload to the lunar surface currently costs tens of thousands of dollars. By leveraging the estimated 4.5 billion metric tons of regolith present across the lunar surface, ISRU-based construction could make permanent lunar infrastructure economically feasible for the first time. NASA's ISRU program considers this capability foundational to sustainable human presence beyond Earth.
Modular Design: Building for a Constrained Environment
The UAH team's choice of a modular architecture reflects a sophisticated understanding of the unique constraints facing construction operations on the Moon. Future lunar manufacturing and assembly facilities are expected to be highly space-constrained, with limited robotic and human labor available for construction tasks. Large, monolithic landing pad structures would be impractical to fabricate, transport, or repair under these conditions.
By contrast, a modular system composed of smaller interlocking units offers several compelling advantages for long-duration lunar surface operations:
- Incremental assembly — pads can be built up piece by piece, allowing operations to begin at smaller scales and expand as infrastructure matures
- Targeted repair — individual damaged components can be replaced without dismantling the entire structure
- Scalability — pad diameter and load capacity can be expanded as mission requirements evolve
- Local fabrication compatibility — smaller components are more easily produced by compact, lunar-based manufacturing systems
This philosophy mirrors broader trends in space architecture and habitat design, where modular, expandable systems are increasingly favored over monolithic structures due to their flexibility and resilience in unpredictable operational environments.
Next Steps: Scaling Up for Marshall Space Flight Center
With the initial prototype tests successfully completed, the UAH team is now engineering a significantly larger second-generation pad measuring 6 meters (approximately 20 feet) in diameter. This expanded prototype will be delivered to NASA's Marshall Space Flight Center — also located in Huntsville, Alabama, and NASA's primary center for space propulsion and launch vehicle research — for a more comprehensive evaluation campaign.
Testing at Marshall will push the design to higher technological readiness levels (TRL) — the standardized NASA scale used to assess how close a technology is to flight-ready status. Key questions to be answered include whether the vented, modular approach can withstand repeated firing cycles without cumulative structural degradation, how well the design scales to larger diameters and higher-thrust engines, and whether the vent geometry can be optimized to further reduce peak thermal loads and ejecta dispersion.
Success at Marshall would position the technology for integration into long-term lunar surface planning efforts by NASA and international partners, potentially including the lunar Gateway staging station and future permanent bases near the lunar south pole — a region of intense scientific and strategic interest due to the confirmed presence of water ice in permanently shadowed craters.
A Foundation for Humanity's Return to the Moon
The work being done at UAH represents a crucial, often-overlooked dimension of space exploration: the unglamorous but absolutely essential task of building the infrastructure that makes bold missions possible. Sending humans back to the Moon — and eventually to Mars — will require not just powerful rockets and advanced life support systems, but a comprehensive ecosystem of surface engineering solutions that allow vehicles to land and depart safely, repeatedly, and without destroying the very infrastructure they depend on.
By tackling the rocket plume interaction problem with an innovative combination of vented architecture, modular construction, and ISRU-compatible materials, Dr. Schneider's team at UAH is laying groundwork that could ultimately support continuous human habitation of the lunar surface — a goal that, for the first time in decades, appears genuinely within reach.
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