The Moon Is an Equipment Killer

Key Takeaways

• Lunar dust damages seals, optics, fabrics, joints, radiators, and moving mechanisms.
• Extreme heat, deep cold, radiation, and vacuum force equipment to survive as systems.
• Long-term lunar operations depend on dust control, thermal design, shielding, and testing.

How the Lunar Environment Affects Equipment in Practice

NASA’s 2026 explanation of weather on the Moon describes a surface with temperatures above 250°F and below -410°F, hardly any atmosphere, no global magnetic field, and constant exposure to micrometeoroids, solar wind, galactic cosmic rays, and solar eruptions. That is the physical setting behind how the lunar environment affects equipment. A machine placed on the Moon does not face one clean engineering problem. It faces dust, heat, cold, radiation, vacuum, terrain, static charge, and high-speed impacts at the same time.

The Moon does not have Earth’s weather, but equipment still gets weathered. Sunlight heats exposed surfaces without an atmosphere to spread that heat. Shadows can drop nearby materials into deep cold. Dust particles remain sharp because the Moon lacks wind and liquid water to smooth them. The surface has weak gravity, so dust can loft, settle slowly, and coat hardware in patterns that differ from Earth-based expectations. A camera lens, a rover wheel, a drill, a solar panel, and a habitat hatch all meet the same setting through different failure paths.

Apollo supplied the first direct lesson. Short crewed visits showed that dust could cling to suits, scratch visors, affect seals, and interfere with mechanisms. NASA’s 2025 page on lunar regolith hazards states that Apollo regolith damaged spacesuit boots, affected vacuum seals on sample containers, and clogged mechanisms. Artemis-era equipment must last longer, operate closer to the lunar south pole, and support more complex surface work, so the old dust problem has grown into a design standard for almost every exposed system.

This table organizes the main environmental hazards and the equipment categories they affect most directly.

Dust Turns Simple Contact Into a Design Problem

Lunar regolith is not ordinary soil. It is broken rock and glassy material formed by billions of years of meteoroid impacts. Without wind or rain to round the particles, fine grains can stay angular and abrasive. NASA’s Moon Base environmentpage describes lunar dust as sharp-edged, clingy, and able to damage spacesuits, seals, tools, vehicles, and surface systems over time.

Abrasive dust changes the meaning of contact. A hinge that works cleanly on Earth can grind itself down when fine regolith enters its bearing surfaces. A hatch seal can lose performance when grains sit between sealing faces. A connector can become unreliable if particles enter electrical contacts or fluid interfaces. Even routine handling creates risk because gloves, tools, sample containers, and suit surfaces can transfer dust from one system to another.

The static charge makes the problem harder. Solar radiation and charged particles affect the lunar surface, and NASA describes regolith as able to cling to nearby items in a way that resembles static attraction. The result is contamination that does not behave like loose sand. Dust can remain on helmet visors, camera lenses, solar panels, radiator surfaces, cables, fabrics, and thermal blankets after shaking or brushing. A small amount of dark dust on a bright thermal surface can change how much sunlight it absorbs, which affects heating and cooling.

Dust also punishes optical equipment. Cameras, navigation sensors, scientific instruments, lidar units, and star trackers depend on clean lenses or windows. A thin layer of dust can reduce contrast, scatter light, or bias measurements. Landing plume dust can coat hardware before a mission begins its primary work. Rover traffic and astronaut movement can add more contamination during surface operations.

NASA and partner organizations are testing active and passive dust controls because no single technique solves the whole problem. Covers can protect inactive equipment, but covers themselves collect dust. Brushes can help, but brushing can scratch surfaces or drive grains into seams. Air jets are limited by the absence of free atmospheric gas and by the cost of carrying consumables. Coatings can reduce adhesion, but their performance depends on material, temperature, charge state, and wear.

The Electrodynamic Dust Shield uses electric fields to lift and remove dust from surfaces such as radiators, solar panels, lenses, boots, suits, and visors. NASA reported that the technology flew in low Earth orbit outside the International Space Station and on the Moon through Firefly Aerospace’s Blue Ghost lunar lander. That does not mean dust control is finished. It means dust control has moved from laboratory need to flight-tested surface hardware.

Temperature Swings Attack Materials, Power, and Thermal Control

Temperature is one of the fastest ways for the Moon to damage equipment that was not designed for it. Near the equator, NASA reports that daytime temperatures can rise above 250°F, then fall after nightfall to about -208°F. In permanently shadowed polar craters, Lunar Reconnaissance Orbiter measurements have found temperatures lower than -410°F. Those swings change how materials expand, shrink, stiffen, soften, crack, and conduct heat.

The lunar south pole adds a location-specific problem. NASA’s south pole environment page states that some permanently shadowed regions can reach about -334°F, with nearby sunlit areas around 130°F. That combination can put a rover, cable, payload, or astronaut tool through steep thermal differences over short distances. Equipment may move from sunlit terrain into cold shadow, or sit partly in sunlight and partly in darkness.

Thermal expansion and contraction can fatigue structures. Metals, composites, glass, ceramics, adhesives, solder joints, and coatings do not all expand at the same rate. When temperature changes repeat, joints and interfaces can build internal stress. A mirror mount, battery housing, drill head, wheel component, antenna hinge, or sensor window may remain intact for a short mission but fail after repeated thermal cycles during longer operations.

Batteries and power electronics face their own limits. Cold reduces battery performance and can prevent charging. Heat can shorten electronics life and increase failure risk. Power conversion equipment must carry electrical loads and handle thermal loads at the same time. Solar arrays can generate electricity during illumination, but a power system for the south pole must account for shadows, terrain, dust, and the need to survive cold periods without steady sunlight.

Thermal control on Earth often uses air, convection, and fans. Lunar hardware cannot count on those tools outside pressurized volumes. In vacuum, heat moves mainly by radiation and conduction through physical contact. Radiators must have clean surfaces and a clear view of cold space. Dust can darken radiators, change their optical properties, and reduce the ability to reject heat. A radiator that absorbs too much sunlight can become part of the problem it was built to solve.

Lubricants create another design concern. Many common oils, greases, and polymers can evaporate, degrade, stiffen, or contaminate nearby surfaces in vacuum and temperature extremes. Rovers, drills, deployment arms, sample handling systems, and habitat mechanisms may need dry lubricants, sealed gearboxes, special coatings, heaters, and sensors that detect rising friction before a mechanism jams.

The design lesson is direct: temperature control cannot sit at the end of the engineering process. It must influence landing site selection, operating schedule, material choice, power storage, dust control, instrument placement, and maintenance planning. On the Moon, a thermal problem can become a power problem, a dust problem, and a mechanical problem during the same operating day.

Radiation and Space Weather Turn Electronics Into Risk Items

The Moon has no dense atmosphere and no global magnetic field comparable to Earth’s protective system. NASA’s weather on the Moon page identifies solar wind, galactic cosmic rays, coronal mass ejections, and micrometeoroids as lunar “weather” sources. For equipment, that means radiation is not an occasional abnormal event. It is part of the operating environment.

Electronics can fail in more than one way under radiation exposure. A high-energy particle can flip a memory bit, corrupt stored data, reset a processor, trigger a false sensor reading, or damage a semiconductor device. NASA’s radiation effects guidance through the NASA Electronic Parts and Packaging Program covers the engineering discipline that deals with these risks for spacecraft electronics. Lunar surface systems use many of the same design concepts, but with the added complications of dust, thermal stress, and limited field repair.

A short-lived robotic payload can accept risk that a crew-support system cannot. A demonstration instrument may tolerate a reboot, a data gap, or reduced life. A habitat power controller, rover navigation computer, airlock sensor, suit interface, or communications relay needs a higher level of fault tolerance. That changes the parts list, software design, shielding, grounding, cable routing, and testing program.

Solar particle events require special attention because they can arrive in bursts. A large solar eruption can raise radiation levels and place both crews and equipment under stress. For machines, the issue is not human health but continuity of operation. Rovers may need safe modes. Power systems may need protective logic. Communications gear may need redundant paths. Data systems may need error correction and backups.

Radiation hardening can increase cost, mass, and procurement difficulty. Some radiation-hardened parts lag commercial electronics in processing speed or availability. Designers often trade between fully hardened components, selective shielding, fault-tolerant software, redundant electronics, and replaceable modules. The right answer depends on mission length, repair access, safety function, and exposure location.

Shielding is not free. More shielding mass can protect electronics, but it also increases launch and landing costs. Poorly chosen shielding can create secondary particles when high-energy radiation strikes it. Equipment designers must place sensitive electronics inside protected volumes when possible, use local shielding for exposed devices, and avoid creating maintenance tasks that force astronauts to handle dusty or awkward electronics boxes in the field.

Data quality also matters. Radiation can affect scientific instruments by creating false counts, noise, or drift. A lunar seismic sensor, plasma detector, resource prospecting instrument, or camera may still function, but its measurements need calibration and health monitoring. Long-duration lunar science depends on knowing when the instrument changed and when the Moon changed.

Vacuum, Low Gravity, and Terrain Change Mechanical Behavior

The Moon’s vacuum changes materials. Water, trapped gases, and volatile compounds can leave surfaces. Some materials can outgas and deposit films on optics, thermal surfaces, or sensors. Adhesives, foams, plastics, paints, and lubricants need screening because a material that seems stable in a laboratory room can behave differently at low pressure under strong sunlight and deep cold.

Vacuum also changes how heat moves. Without air, there is no ordinary wind cooling. Motors, processors, batteries, and power electronics must move heat through conduction paths or radiate it away. A component buried inside a poorly connected box can overheat even when the surrounding scene is cold. A component exposed to deep shadow can freeze even when nearby equipment runs hot.

Low gravity affects dust, mobility, handling, and landing. The Moon’s gravity is about one-sixth of Earth’s, so wheels, feet, drills, and landing legs do not load the ground in the same way. A rover can have less traction than expected. A drill can push the rover upward instead of penetrating the ground efficiently. Tools can bounce or slide in ways that complicate astronaut handling.

Terrain at the south pole can be steep, shadowed, and uneven. NASA describes the region as having high mountains, deep craters, steep slopes, and rugged topography. That matters for equipment because a rover is not simply driving over a flat test bed. It may need to cross loose regolith, avoid rocks, handle slopes, retain orientation in confusing lighting, and operate where shadows hide hazards.

Navigation sensors must cope with harsh light. Low sun angles create long shadows. Bright surfaces can sit beside black shadow. Cameras can lose detail in high contrast scenes. Lidar and radar systems may help, but dust, slope, reflectivity, and power constraints can still affect performance. Autonomous systems need conservative decision logic because a stuck rover or jammed deployment arm can end a mission.

Human equipment faces the same physics. Spacesuit joints must bend despite dust and temperature swings. Gloves must allow dexterity without letting dust compromise bearings, seals, or fabrics. Boots must resist abrasive wear and preserve traction. Tool interfaces need shapes that dusty gloves can operate. A connector that requires delicate alignment may be poor lunar equipment even if it works perfectly in a clean Earth laboratory.

Terrain also changes maintenance. Repairing a rover beside a workshop is one task. Repairing it in a shadowed crater, wearing a suit, with dust on every surface, is another. Lunar equipment has to reduce maintenance demand, guide crews through simple actions, and make failure states visible. A design that needs frequent fine adjustment may fail because the environment makes the adjustment impractical.

Landing Plumes and Micrometeoroids Add Impact and Contamination Risks

Landing and takeoff can harm nearby equipment before crews or rovers begin normal work. Rocket exhaust interacts with loose regolith and can throw particles at high speed. Dust and small rocks can scour surfaces, coat solar panels, damage thermal blankets, interfere with optical systems, and contaminate exposed mechanisms. The risk grows when missions place assets closer together for power, communications, logistics, and crew access.

Landing pads, berms, surface stabilization, stand-off distances, and careful approach profiles can reduce plume effects. Those measures matter because lunar operations depend on repeat visits. A single lander can tolerate some self-contamination if it performs a short mission. A base with reusable equipment, stored cargo, science instruments, and power infrastructure cannot treat every landing as an isolated event.

Micrometeoroids create a different impact risk. NASA describes micrometeoroids as part of lunar space weather, and these particles can strike exposed surfaces at very high speeds. Earth’s atmosphere burns up many small particles before they reach the ground. The Moon offers no comparable shield, so habitats, cables, tanks, radiators, solar arrays, and instruments need protection strategies.

Shielding must fit the function. A habitat wall, pressure vessel, battery enclosure, and camera housing do not all need the same level of protection. Some systems can use sacrificial outer layers. Others need stand-off shields that break up particles before they reach the main wall. Many exterior systems need redundancy because a perfect shield may be too heavy or too expensive.

Cables deserve more attention than they often receive. Surface power, communications, sensing, and navigation may depend on cable runs between assets. Cables can suffer from dust abrasion, thermal cycling, ultraviolet exposure, micrometeoroid strikes, and traffic damage. A cable lying on regolith may experience different thermal behavior from a cable mounted on a raised support. A buried cable may gain thermal stability but become harder to inspect and repair.

Plume risk also affects science. Instruments placed to study dust, plasma, volatiles, or surface chemistry can be contaminated by nearby landings. A drilling experiment, telescope, seismometer, or volatile detector may need isolation from traffic and exhaust products. Science planning and operations planning cannot be separated because the act of arriving can change the environment being measured.

These hazards support a broader design rule: lunar equipment should avoid assuming a clean start and a clean operating zone. The surface will change. Landers will disturb soil. Rovers will create tracks. Astronauts will carry dust. Micrometeoroids will strike without warning. A well-designed system expects contamination, detects degradation, and keeps working after partial damage.

Equipment Design Becomes a System-of-Systems Problem

The lunar environment affects equipment most strongly when hazards combine. Dust on a radiator can raise temperature. Higher temperature can stress electronics. Radiation can upset electronics during the same period. A rover may enter shadow, lose battery performance, encounter loose regolith, and need software assistance at once. The Moon rarely gives hardware one problem at a time.

NASA’s Lunar Surface Innovation Initiative lists technology areas that include power and thermal management, autonomous robotics, excavation and construction, and dust mitigation. Those categories are connected in practice. A dust-control system may need power. Power hardware needs thermal control. Thermal hardware needs clean surfaces. Robotics need reliable sensors, and sensors need protection from dust, glare, radiation, and temperature swings.

Rovers illustrate the system problem. Wheels need traction and wear resistance. Motors need thermal control. Batteries need temperature management. Computers need radiation tolerance. Cameras need clean optics. Solar panels need dust control. Navigation software needs to understand shadows and slopes. The rover is also part of a larger operational network because it may carry science payloads, support astronauts, deploy cables, inspect landers, or move cargo.

Habitats and pressurized modules add another layer. Airlocks must reduce dust transfer into living volumes. Filters must capture fine particles without clogging too quickly. Hatches must seal after repeated dusty operations. Exterior radiators must reject heat despite contamination. Power systems must survive shadow and dust. Maintenance plans must account for crew time, suit limitations, and spare part storage.

Scientific payloads face their own tradeoffs. A telescope on the far side of the Moon may benefit from radio quiet and lack of atmosphere, but it must survive dust, temperature swings, deployment hazards, radiation, and micrometeoroids. A resource prospecting drill must reach useful depths, manage cuttings, survive abrasive grains, and avoid false readings caused by heat or contamination. A seismometer may need good ground coupling, but that can expose it to dust and thermal gradients.

The economic implications are direct. Lunar hardware that survives longer can reduce replacement flights, increase science return, and support more dependable operations. Equipment that fails early can make surface logistics expensive because each replacement must be manufactured, launched, landed, commissioned, and protected. Design margins, test programs, and redundancy add cost, but underdesign can cost more after landing.

Defense and security users also care about the same environmental issues. Navigation, communications, situational awareness, autonomous inspection, power resilience, and equipment survivability matter for any long-duration surface presence. The lunar environment does not change for civil, commercial, scientific, or defense missions. Only the consequences of failure differ.

Testing for the Moon Requires More Than Simulated Dust

Engineers use vacuum chambers, thermal vacuum testing, radiation testing, regolith simulants, vibration testing, and field trials to approximate lunar conditions. Each method reveals part of the problem. None recreates the full Moon perfectly. A chamber may simulate vacuum and temperature, but not large-area terrain. A regolith simulant may match some particle properties, but not every feature of Apollo sample dust. A radiation test may qualify electronics, but not reveal how dust affects a connector after repeated thermal cycles.

Regolith simulants still matter because real Apollo samples are scarce and controlled. Simulants let teams test abrasion, wheel traction, drilling, sealing, dust adhesion, filtration, optical contamination, and cleaning methods. Good testing uses simulants that match the property under study. A simulant chosen for mineral content may not be the best choice for abrasion. A simulant chosen for particle size may not match electrostatic behavior.

Thermal vacuum testing helps expose weak interfaces. Materials can crack, coatings can change, lubricants can migrate, electronics can overheat, and mechanisms can seize. Testing must include realistic duty cycles. A rover wheel that survives one cold soak may still fail after many cycles under load. A hatch seal may work once, then degrade after dust exposure and repeated compression.

Radiation testing checks electronic parts and software fault handling. Equipment can use error-correcting memory, watchdog timers, redundant processors, current limiting, power cycling, and safe modes. Testing must match the expected mission environment and function. A camera used for casual imagery can accept more risk than a hazard detection sensor used during landing or crew driving.

Flight demonstrations fill the gap between Earth testing and operational confidence. NASA’s dust technology work includes tools for reducing dust buildup, and the Electrodynamic Dust Shield has moved through orbital and lunar demonstrations. Surface demonstrations are valuable because they expose systems to dust behavior, lighting, charge, thermal cycling, and operational constraints that laboratory tests approximate but cannot duplicate fully.

This table links equipment types to the tests most relevant to lunar survival.

Testing also shapes procurement. Specifications need measurable environmental requirements, not broad descriptions of harshness. Useful requirements identify allowable dust loading, temperature limits, radiation exposure, thermal cycle counts, expected maintenance intervals, acceptable performance degradation, and recovery behavior after faults. A vague requirement to survive the Moon is not enough for contractors, reviewers, or mission operators.

Summary

The Moon damages equipment by combining hazards that are familiar in isolation but harder in combination. Dust abrades and clings. Temperature swings stress materials and power systems. Radiation disrupts electronics. Vacuum changes lubrication, heat flow, and material behavior. Low gravity alters mobility and dust motion. Micrometeoroids and landing plumes add impact and contamination hazards.

The practical result is that lunar hardware must be designed as part of an operating system rather than as a stand-alone object. A rover, habitat, instrument, airlock, power unit, or cable network has to survive contact with dust, cold, heat, radiation, and rough terrain before it can perform its main task. Reliability comes from materials, layout, shielding, redundancy, cleaning, inspection, software recovery, and mission planning working together.

The Moon rewards simple, inspectable, repairable designs. It punishes exposed joints, delicate seals, unprotected optics, ordinary lubricants, fragile cables, and systems that need frequent fine maintenance. Future surface operations will depend less on any single breakthrough than on disciplined engineering across dust control, thermal management, electronics protection, and surface logistics. The environment is not a background condition. It is one of the main design inputs for every piece of equipment that touches the lunar surface.

Appendix: Useful Books Available on Amazon

• The Lunar Sourcebook: A User’s Guide to the Moon
• The Value of the Moon
• Return to the Moon
• The Moon: Resources, Future Development and Settlement
• Lunar Settlements

Appendix: Top Questions Answered in This Article

How Does Lunar Dust Damage Equipment?

Lunar dust damages equipment because its particles are sharp, abrasive, fine, and prone to sticking through electrostatic effects. It can scratch optics, wear fabrics, interfere with seals, clog mechanisms, change radiator performance, and contaminate connectors. Apollo missions showed these effects during short stays, and longer Artemis-era missions will demand stronger dust-control methods.

Why Are Lunar Temperature Swings Hard on Hardware?

The Moon lacks a dense atmosphere that can spread heat and soften temperature differences. Sunlit surfaces can become very hot, and shadowed regions can become extremely cold. Materials expand and contract under those swings, which can stress joints, solder, adhesives, seals, batteries, lubricants, and coatings.

Why Is the Lunar South Pole Especially Difficult for Equipment?

The lunar south pole has steep terrain, long shadows, low Sun angles, cold permanently shadowed regions, and nearby illuminated areas with different temperatures. Equipment may need to operate across bright sunlight, deep shadow, slopes, and abrasive regolith. These conditions complicate power generation, mobility, thermal control, and navigation.

Can Ordinary Earth Equipment Work on the Moon?

Ordinary Earth equipment generally cannot work on the Moon without extensive redesign. Vacuum affects lubricants and materials, temperature swings damage components, radiation threatens electronics, and dust contaminates moving parts and surfaces. Lunar hardware needs specialized testing, materials, seals, electronics protection, and operating procedures.

Why Does Vacuum Matter for Lunar Equipment?

Vacuum changes heat transfer, material behavior, and lubrication. Equipment cannot use ordinary air cooling outside pressurized spaces, and some materials can outgas or degrade. Designers must plan conductive heat paths, radiators, vacuum-compatible lubricants, and materials that do not contaminate optics or sensitive surfaces.

How Does Radiation Affect Lunar Electronics?

Radiation can disrupt electronics by flipping memory bits, creating false signals, resetting processors, or damaging semiconductor devices. Lunar systems may need shielding, radiation-tolerant parts, error correction, safe modes, and redundant control paths. The need depends on mission length, equipment function, and acceptable failure risk.

Why Are Seals Such a Problem on the Moon?

Seals must work despite dust, vacuum, temperature cycling, and repeated use. Fine regolith can sit between sealing surfaces, causing leakage or wear. Habitat hatches, sample containers, connectors, and suit interfaces all need seal designs that resist contamination and allow inspection, cleaning, or replacement.

What Makes Lunar Rovers Difficult to Design?

Lunar rovers must handle low gravity, loose regolith, abrasive dust, slopes, temperature extremes, radiation, and limited maintenance access. Wheels, motors, batteries, cameras, computers, and power systems all face environmental stress. A rover also needs conservative software because a navigation error can leave it stuck beyond easy recovery.

Can Dust Shields Solve the Lunar Dust Problem?

Dust shields can reduce contamination, but they are one part of a larger solution. Electrodynamic systems can lift dust from certain surfaces, and coatings can reduce adhesion. Equipment still needs covers, barriers, cleaning tools, dust-tolerant mechanisms, good operational habits, and testing under realistic conditions.

Why Does Lunar Equipment Need So Much Testing?

Lunar equipment needs extensive testing because hazards interact. A part that survives dust may fail after thermal cycling. Electronics that pass radiation testing may overheat when dust coats a radiator. Testing must combine vacuum, temperature, dust exposure, vibration, radiation, and realistic operating cycles wherever possible.

Appendix: Glossary of Key Terms

Lunar Regolith

Lunar regolith is the loose layer of dust, broken rock, and glassy material covering much of the Moon’s surface. It formed through long-term meteoroid impacts and space weathering. For equipment, its sharp particles create abrasion, contamination, and sealing problems.

Electrostatic Charge

Electrostatic charge is an electrical imbalance that can cause particles to cling to surfaces. On the Moon, solar radiation and charged particles can help charge dust grains. This makes dust removal harder and increases contamination risk for suits, optics, radiators, and mechanisms.

Thermal Vacuum

Thermal vacuum refers to a test condition that combines low pressure with hot and cold temperature cycling. It helps engineers evaluate equipment behavior under space-like conditions. Lunar hardware needs this testing because heat moves differently in vacuum than it does in air.

Micrometeoroid

A micrometeoroid is a tiny natural particle traveling through space at high speed. The Moon lacks an atmosphere that can burn up such particles before they reach the ground. Exposed surface equipment may need shielding, redundancy, or repair plans to manage impact risk.

Solar Wind

Solar wind is a stream of charged particles flowing from the Sun. It affects the lunar surface because the Moon has no dense atmosphere and no strong global magnetic shield. Solar wind contributes to surface charging, dust behavior, and radiation exposure.

Galactic Cosmic Rays

Galactic cosmic rays are high-energy particles arriving from beyond the solar system. They can affect electronics, instruments, and human crews in deep space and on the lunar surface. Equipment designers use shielding, fault tolerance, and testing to reduce their effects.

Permanently Shadowed Region

A permanently shadowed region is an area, often inside a polar crater, that receives little or no direct sunlight. These regions can be extremely cold and may preserve water ice. Equipment entering them needs special thermal, power, lighting, and mobility planning.

Thermal Control

Thermal control is the engineering discipline used to keep equipment within safe temperature limits. On the Moon, it may involve insulation, heaters, radiators, conductive paths, coatings, operating schedules, and dust management. Poor thermal control can lead to battery, electronics, or structural failure.

Outgassing

Outgassing occurs when materials release trapped gases or volatile compounds in vacuum. Released material can settle on optics, sensors, or thermal surfaces. Lunar equipment uses screened materials and careful placement to reduce contamination caused by outgassing.

Fault Tolerance

Fault tolerance is the ability of a system to keep working after a component error or partial failure. Lunar equipment may use redundant electronics, safe modes, error correction, and modular replacement. Radiation, dust, and thermal stress make fault tolerance a practical requirement.