NASA Proposes Repurposing Mars Rover Replicas for Lunar South Pole Mission
The PROMISE mission aims to leverage Earth-based engineering models of Perseverance and Curiosity to scout for water ice on the Moon.
NASA has proposed a new lunar mission called PROMISE (Polar Rover for Observation, Mapping and In-Situ Exploration) that would repurpose Earth-based engineering replicas of its Mars rovers to explore the lunar south pole. The initiative seeks to transform high-fidelity testbeds into active explorers to accelerate the agency's lunar objectives.
The mission involves utilizing the engineering test models of the Perseverance rover—specifically the model known as OPTIMISM—and potentially elements from the Curiosity replica. To ensure the rover can operate in the Moon's most hostile environments, NASA plans to equip it with a Multi-Mission Radioisotope Thermoelectric Generator (MMRTG). This plutonium-fueled power source will allow the vehicle to function regardless of sunlight, enabling it to survive the lunar night and enter permanently shadowed regions.
The Strategy of Repurposing
NASA maintains full-scale Earth replicas of its Mars rovers to test software and hardware updates before they are deployed to the Red Planet. While these "twins" were originally designed solely as ground testbeds, the agency is now exploring ways to leverage this existing, taxpayer-funded hardware for the broader Moon Base project.
Jared Isaacman, NASA Administrator, noted that the agency has years of experience operating the actual rovers on Mars and possesses hardware that has already seen significant investment. "So the question was posed: 'What if we send it to the moon?'" Isaacman said.
Scouting for Lunar Resources
The primary objective of the PROMISE mission is to scout the lunar south pole to characterize both the surface and subsurface. Specifically, the rover will search for water ice, a critical resource required to support the establishment of future permanent lunar bases.
The use of nuclear power is central to this goal. Because solar-powered equipment is typically disabled by the extreme cold and darkness of the lunar night, the MMRTG provides a decisive advantage. Carlos García-Galán, Moon Base project program manager, stated that having a nuclear RTG allows the mission to "go anywhere we want, regardless of the illumination."
Implications for Exploration
By repurposing existing high-fidelity hardware, NASA aims to bring immense capability to the lunar south pole more efficiently than building a new platform from scratch. This approach allows the agency to deploy a proven chassis and mobility system that has already been refined through years of terrestrial testing.
What remains to be seen is the final timeline for the mission and the specific modifications required to transition these ground-based replicas into flight-ready spacecraft. While the core proposal focuses on the ability to survive the lunar environment and locate ice, the full suite of scientific instruments for the mission has yet to be finalized.