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ESDMD #0804: Robotic and Mobility Systems in Extreme Cold Environments on the Lunar Surface

Actuators, wheels, electronics and perception that let robots and rovers work in permanently shadowed regions (PSRs) and other extreme-cold, dark or steep terrain (bin 3, rating 19 of 57). The target is robotic operation at "~20–30 K". Today's subsystems have been tested only separately, between 220 K and 130 K, with limited lifetimes. It is named in the Moon Base Users Guide (near-term), for long-duration operations (Tech gaps spreadsheet, ESDMD #0804; Users Guide, p. 12).

Quotations below are from row ESDMD #0804 of the tech gaps spreadsheet unless marked otherwise. ADD Rev C's Appendix D prints the same table for this gap, and it matches the row field for field (ADD Rev C, p. 239).

Description

"Access to extreme cold surface environments including permanently shadowed regions (PSRs) presents several technology challenges. Extreme cold temperature robotic and mobility components such as actuators, wheels, electrical and electronic systems, and other subsystems including robust perception in low or no lighting are critical to enabling access to PSRs. Lunar regolith poses a significant challenge for the durability of mobility systems. Regolith mitigation technologies and strategies are vital to limit degradation to mobility systems, including actuators, wheel components, and power transmission systems."

Impacts and benefits: "Without gap closure, robotic and mobility assets may not be able to survive/operate for required duration inside PSRs (TBR) or while transiting shadowed regions. With gap closure, robotic and mobility assets may enhance remote access to areas of scientific interest, and improve robotic reconnaissance (e.g., scouting, surveying, mapping, collecting samples)."

Current state of the art

"Non-integrated subsystems tested independently between 220 K and 130 K, with limited operational lifetimes."

Performance target

Moon: "Enable use cases for surveying and accessing PSRs for sample retrieval. Enable robotic operations in PSRs with minimum temperatures of ~20–30 K for a maximum duration of [TBR] hours. Enable robotic exploration of regions where landing or crew entry are not feasible or advisable (e.g., areas of darkness colder than TBD degrees Kelvin, slope greater than TBD degrees, or other difficult terrain)."

The ~20–30 K figure is a design target, not a measurement. It bears on the open disagreement between Moon Base web pages over the PSR minimum temperature: −203 °C (about 70 K) on two pages, "near -250°C" (about 23 K) on another (see Environment and open questions, item 3).

Child gaps

  • 0804-01*: Perception and navigation sensors for extended operation in the lunar environment and dynamic lunar lighting conditions
  • 0804-02: Robotic actuation for extreme cold access
  • 0804-03: Rover wheels/tires for extended-duration surface missions in extreme lunar environments
  • 0804-04: Robotic mobility for robust, repeatable access to and through extreme terrain, surface topography, and harsh environmental conditions
  • 0804-05: Extreme-temperature electronics for exploration missions
  • 0805-01*: Software for robust perception in dynamic, suboptimal lunar lighting conditions

Both starred child gaps also appear under #0805. The asterisk marks "a child gap with multiple parents" (ADD Rev C, p. 199).

Traceability

  • Use cases and functions: UC-A-101 L -- FN-A-202 L; UC-A-106 L -- FN-A-202 L
  • Definition tasks: none listed

Segments and sub-architectures

Priority

Priority bin 3, overall prioritization rating 19 of 57. The rating is "the gap's location in the prioritized list of gaps", so 1 is the highest priority, and bins group gaps of similar priority, bin 1 highest. Criticality, urgency, breadth and depth set the order; cost is not considered (ADD Rev C, pp. 78, 199; method on the gaps index).

Moon Base relevance

The guide lists #0101, #0201, #0301, #0801 and #0804 together against the three technology bullets of the long-duration challenge, without assigning gaps to bullets. The bullets quoted below are the ones closest to this gap's subject.

The Users Guide names #0804 under the headline challenge "Operating on the lunar surface for long durations", whose technology challenge includes "Develop extreme temperature-tolerant mechanisms and electronics for operating through periods of lunar shadow without dedicated heating systems" and "Develop mitigation systems and strategies to limit system degradation from lunar dust" (Users Guide, p. 12). The guide ties its challenges to "near-term Moon Base development efforts": missions in phase one "offer opportunities to collect data and mature technologies to enable essential phase two and phase three capabilities" (p. 11). See Technology and knowledge challenges. The Users Guide's Phase 1 mobility functional gaps include FN-M-304 L, "Enable local unpressurized surface mobility in PSRs at the south pole region of the lunar surface" (Users Guide, p. 10), but that function is not in this gap's traceability.

A test rig on the same subject (the pairing is the wiki's; the article names no gap). Glenn's Lunar Environment Structural Test Rig, which a May 2026 article presents with the Moon Base's cold as the reason, tests "materials, electronics, and other flight hardware at temperatures as low as 40 Kelvin" with a cryocooler instead of liquid cryogens. Its first use is "a next-generation shape memory alloy that is capable of functioning at temperatures down to 40 Kelvin, one of the coldest regions we could go to with rover capability", for rover tires (LESTR article, May 2026). That is colder than the 130 K of today's subsystem tests (state of the art, above), but not as cold as this gap's "~20–30 K". The alloy is still in development; the article gives no results.

Sources

Tech gaps spreadsheet, ESDMD #0804 · ADD Rev C, pp. 78, 199, 239 · Users Guide, pp. 10, 12 · LESTR article, May 2026