The Italian Space Agency (ASI) has significantly expanded its EXOTech (EXtraterrestrial Outpost Technologies) Laboratory with a suite of new instruments dedicated to the physical, mineralogical, and thermal characterization of lunar regolith, the loose dust and rock covering the Moon's surface. The upgrade, funded through the Earth-Moon-Mars (EMM) project under Italy's PNRR recovery plan and supported by the European Union's NextGenerationEU program, aims to accelerate development of a Lunar Thermal Energy Storage (TES) system that would store solar heat during the lunar day and release it during the two-week-long lunar night.
Reliable energy availability on the lunar surface remains one of the most difficult challenges for sustained exploration. The TES concept uses regolith itself as the storage medium, capturing thermal energy from solar radiation and making it available for thermal management and electricity generation when sunlight is unavailable. The EXOTech Lab supports the development and construction of a demonstrator for this system.
The new instrumentation includes a Raman microscope for identifying mineral phases, molecular structures, and compositional variations in samples; an optical microscope for high-resolution visual inspection of particle shape, surface textures, and mineral distribution; and a Dynamic Image Analyzer for measuring grain-size distribution and morphological characteristics of regolith particles. The lab also added apparent and true density analyzers to measure skeletal and bulk density, a thermogravimetric system (TGA) to monitor mass changes as a function of temperature and study thermal stability and volatile release, and a Transient Plane Source (TPS) Analyzer to measure thermal conductivity, thermal diffusivity, and specific heat capacity across a wide range of materials.
Since its initial setup, the laboratory has operated a thermal-vacuum chamber that simulates solar irradiation and allows researchers to evaluate how lunar regolith behaves under TES-relevant conditions. The facility also uses software for modeling and predicting the thermal, mechanical, and structural behavior of regolith in the lunar environment.
The research will proceed in stages. The first step is physical and thermal characterization of lunar regolith and its terrestrial analogs. Subsequent tests in the thermal-vacuum chamber will reproduce the Moon's day-night cycles. Data collected will be used to validate numerical models and to design a demonstrator of the TES system.
Beyond the immediate energy storage goals, the lab upgrade is intended to raise the technology readiness level of core payloads for the Lunar Adaptive Outpost for Remote Italian Experiments (LAORIE), a lunar infrastructure conceived within the EMM project's WP-1330 work package. The investment is designed to be sustainable, supporting future lunar and Martian exploration programs while providing a research environment suitable for training the next generation of scientists in collaboration with universities and research institutions.
The EXOTech Lab positions itself as a reference infrastructure for studying heat exchange and energy storage on the Moon, addressing a critical gap in plans for long-duration surface missions. Without reliable power through the lunar night, most surface operations would be limited to daylight hours. By using locally available regolith rather than transported materials, the TES approach could reduce the mass and cost of future lunar outposts.