Producing oxygen from lunar regolith, building structures with local materials, and converting the Martian atmosphere into useful resources could help reduce the dependence of future missions on supplies transported from Earth. But demonstrating that a technology works is only the beginning. How can these promising approaches become reliable systems that support long-term exploration beyond Earth?
In an editorial published in Planet, Lifang Li, Mengfan Tian, and Pengzhen Guo from Harbin Institute of Technology examine the opportunities and challenges of extraterrestrial in-situ resource utilization (ISRU). They emphasize that ISRU must move beyond individual technology demonstrations toward integrated systems that connect planetary science with deep-space engineering.
The editorial highlights four interconnected challenges. First, identifying a resource does not necessarily mean it can be extracted and used. Quantitative methods are needed to link remote-sensing observations and sample analyses with resource accessibility and recoverability. Second, extraction and processing technologies must remain reliable under harsh planetary conditions, including dust, vacuum, extreme temperature variations, and equipment degradation. Third, ISRU must be integrated with energy supply, thermal management, transportation, construction, maintenance, and waste recycling, rather than developed as a collection of independent technologies. Finally, resource utilization must be balanced with scientific preservation, environmental impact assessment, planetary protection, and international norms.
A central message is that resource availability alone does not guarantee practical usability. Understanding the properties and distribution of planetary materials is essential, but this knowledge must also guide the design of extraction technologies and the planning of future missions.
Looking ahead, the authors highlight opportunities in lunar polar ice exploration, oxygen production from lunar regolith, Martian CO₂ conversion, and resource assessment on small bodies. Although these environments present different challenges, they share a common goal: turning locally available materials into dependable resources for exploration.
The editorial underscores the importance of bringing planetary science and engineering together to move ISRU from promising experiments toward sustainable, long-term planetary infrastructure.
DOI:10.15302/planet.2026.26013