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NASA chooses a lunar landing site by matching a mission’s science goals to what its spacecraft and surface systems can safely reach and operate in. A site with exceptional scientific value may still be unsuitable if the lander cannot touch down there, a rover cannot cross the terrain, sunlight is inadequate, or communications are blocked. There is no single best site—or universal set of criteria and weights—for every robotic lunar mission.
How does NASA decide where to land on the Moon?
Site selection starts with the mission’s purpose. Planners identify the science or exploration questions the mission needs to answer, then assess whether candidate areas are reachable and usable with the planned spacecraft, lander, rover, and operations approach. They compare the potential scientific return with landing and surface risks, environmental conditions, and whether the mission can reach and work at a site when planned.
NASA describes selection as an iterative trade, not a fixed checklist in which every factor has the same importance. The balance depends on the mission architecture: a stationary lander, a mobile rover, and a crewed landing have different abilities and constraints. NASA’s 2022 Lunar Landing and Operations Policy Analysis summarizes the principle as: “Selection of landing sites is driven primarily by operational needs and mission goals.”
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What makes a lunar landing site suitable?
Candidate regions are compared across factors that interact. A site’s scientific value matters only in combination with the mission’s ability to reach it, land safely, and carry out the planned work there.
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| Factor | Why planners consider it | Mission-specific implications |
|---|---|---|
| Science and exploration value | The location must support the mission’s questions, target materials, or exploration objective. | A high-value target may involve more difficult terrain or operating conditions. |
| Landing safety and terrain | Slopes, craters, rocks, roughness, and abrupt elevation changes can threaten touchdown or surface operations. | Acceptable terrain depends on the lander’s descent performance and the surface system’s design. |
| Mobility and access | A rover must be able to travel between its landing point and targets. | Traversability, slope, obstacles, and the rover’s capabilities determine which routes are practical. |
| Lighting and power | Illumination affects solar power and can constrain work in shadowed areas. | Sunlight requirements depend on the mission’s power system, schedule, and tolerance for shadow. |
| Communications | The mission must be able to receive commands and return data. | A direct-to-Earth mission needs a usable communications path; terrain may obstruct it. |
| Trajectory and mission availability | A region must fit the actual launch opportunity and the vehicle’s route and descent capabilities. | Reachability and operating dates depend on the specific spacecraft and mission plan. |
| Proximity to other destinations or assets | Some missions may benefit from access to surface infrastructure or nearby science targets. | This matters when the mission plan requires such access; it is not a universal requirement. |
Terrain can affect both landing and surface work
For a lander, slopes and obstacles matter during descent and touchdown. For a rover, the same landscape also determines whether it can reach its targets. NASA describes the lunar south polar environment as rugged, with steep slopes, ridges, deep craters, rocks, and elevation changes. Terrain near a scientifically important feature may therefore offer high value but make landing or traversal more difficult.
Sunlight and communications are operational constraints
Illumination affects whether solar-powered systems can generate power, and shadow can limit how long some missions can operate in a location. Communications also depend on mission design. A vehicle operated directly from Earth may need a clear view of Earth; another architecture could have different communications options. These are not interchangeable conditions: sunlight serves power and thermal planning, while line of sight supports communications.
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How does NASA compare candidate areas?
NASA’s Artemis IV workshop material describes a five-part iterative approach. It is a process example, not a published universal formula for robotic missions:
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- Account for capabilities. Consider what each mission element can do, including the landing and surface systems.
- Identify acceptable-slope areas. Find terrain that can meet objectives without exceeding vehicle capability.
- Analyze the geography. Use geospatial analysis to examine candidate locations and their conditions.
- Balance the tradeoffs. Apply weighted figures of merit to compare drivers alongside mission availability.
NASA’s presentation describes the final step as: “Apply weighted Figures of Merit (FOMs) for various sites to maximize and balance drivers with mission availability.” The weights are part of the mission-specific trade; the cited material does not establish one standard set of weights for robotic lunar missions.
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How do scientists choose a landing site for a Moon rover? VIPER as an example
NASA’s September 2021 account of the VIPER rover’s planned landing region provides a direct robotic example. The team said its choice was intended to answer VIPER’s fundamental science questions, while also accounting for constraints imposed by the rover and its operations. The NASA article put it this way: “We, of course, chose a landing region that will best answer the fundamental science questions asked by the mission, but there are a number of constraints that also needed to be folded into this decision.” The statement is attributed to the mission team collectively, not to a named speaker.
Sunlight for a solar-powered rover
VIPER was planned as a solar-powered rover, so the team considered whether the rover could get enough sunlight and avoid remaining in shadow too long. A location’s science value would not, by itself, make it workable if the power conditions prevented the rover from doing its job.
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Earth visibility for direct-to-Earth operations
NASA planned to command VIPER directly from Earth. Its site planning therefore considered whether terrain could block the communication path. This constraint reflects VIPER’s planned communications approach; it should not be assumed to describe every lunar rover or lander.
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Traversability between the landing point and targets
Because VIPER was mobile, planners also considered slopes and rock obstacles along the rover’s routes. A region can contain valuable targets yet be a poor rover destination if the vehicle cannot safely traverse the terrain needed to reach them.
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What Artemis site selection can—and cannot—show about robotic missions
Artemis illustrates NASA’s broader multi-factor planning logic, but Artemis III is a crewed mission, not a robotic landing. In its 2024 announcement of nine South Pole candidate regions, NASA said it considered science value, launch-window availability, terrain suitability, communications with Earth, lighting, and the combined trajectory capabilities of SLS, Orion, and Starship HLS. Those vehicle-specific capabilities and requirements are not a template for every robot.
NASA’s 2025 Artemis III site-selection abstract adds detail about that crewed downselection: the assessment considered launch opportunities, transit and rendezvous geometry, communications, landing performance, illumination, and terrain safety. Teams favored regions with low-slope area and flexibility to mitigate craters, blocks, roughness, and variable terrain. These findings describe the Artemis III assessment rather than a universal standard for robotic sites.
NASA’s 2022 Artemis announcement described a landing site within a candidate region as having an approximate 100-meter radius. That figure refers to the announcement’s Artemis III use of “landing site”; it is not a standard size for robotic landing sites.
Why don’t lunar missions all land in the same place?
Different missions seek different science, carry different hardware, and face different operating limits. A rover may need routes between several targets, a stationary lander may prioritize conditions at one location, and a solar-powered vehicle may depend on a workable illumination schedule. The safest or easiest terrain may also be farther from a high-priority target. NASA’s selection process therefore compares candidate locations against each mission’s goals and capabilities rather than declaring one lunar region best for all missions.
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