# NASA to repurpose Mars rover for lunar mission The PROMISE rover will scout water ice at the Moon's south pole with nuclear power. - **Source:** [Engadget](https://www.engadget.com) - **Published:** 2026-08-07 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/9a80bef1-e0b8-4348-a123-3870a866ae3b ## Earth-bound test models heading to Moon NASA's Curiosity and Perseverance Mars rovers have full-scale test models on Earth used for pre-deployment testing. Now, the agency plans to send Perseverance's engineering test model - or a hybrid with Curiosity - to the Moon. This decision aims to maximize utilization of existing hardware investments while expanding lunar exploration capabilities with proven technology. ## PROMISE project announced In late June, NASA unveiled plans for the Polar Rover for Observation, Mapping and In-Situ Exploration (PROMISE) to explore the Moon's polar regions. The rover will be a modified version of Perseverance's Earth-bound engineering model. NASA administrator Jared Isaacman stated, 'The idea emerged to send this taxpayer-funded hardware to the Moon,' highlighting the cost-efficiency of repurposing existing assets. ## Nuclear-powered operation PROMISE will be equipped with a plutonium-fueled Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) that converts decay heat into electricity. NASA program manager Carlos García-Galán explained, 'The nuclear RTG allows exploration regardless of sunlight conditions.' This technology will enable operations during the Moon's two-week-long nights when solar power isn't available. ## Targeting the lunar south pole PROMISE's primary mission involves mapping and characterizing water ice deposits at the south pole - a prime location for future lunar bases. The confirmed presence of water ice would be transformative for both crewed missions and long-term colonization under the Artemis program. This reconnaissance will inform NASA's plans for sustainable lunar exploration. ## Current hardware shortcomings The OPTIMISM testbed (PROMISE's predecessor) currently lacks flight-ready instruments according to The Planetary Society. Missing components include temperature control sensors, scientific payloads, communication systems, and dust-resistant features needed for the abrasive lunar environment. NASA hasn't yet disclosed its upgrade roadmap to address these deficiencies before the projected early 2030s launch. ## $700M-$1.3B estimated cost The Planetary Society estimates PROMISE will cost NASA between $700 million and $1.3 billion, with launch not expected before the early 2030s. While repurposing existing hardware provides cost advantages, extensive modifications for lunar conditions contribute to the significant budget. This investment reflects the strategic importance of polar water resources for establishing permanent lunar presence. ## Mars-to-Moon technology transfer NASA's decision represents a pioneering approach to cross-mission hardware utilization. The OPTIMISM testbed, previously used to simulate Mars operations, will now validate lunar exploration technologies. This marks a strategic shift toward maximizing return on investment for planetary exploration systems across multiple destinations in the solar system. ## Critical step for lunar exploration The PROMISE mission constitutes a significant milestone for NASA's Artemis program. A nuclear-powered rover capable of operating in permanently shadowed regions would dramatically expand scientific investigation opportunities. Water ice mapping directly supports sustainable human exploration by identifying vital resources for future lunar bases and potential fuel production. ## Sources covering this story - https://www.engadget.com/2230972/nasa-mars-rover-promise-lunar-mission/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._