Cislunar Space: The New Frontier Between Earth and the Moon

Key Takeaways

• Cislunar space spans from geosynchronous orbit to the Moon, covering 1,728x the volume of GEO
• Artemis II launched April 1, 2026, sending four astronauts on the first crewed cislunar mission since Apollo
• The US Space Force formally declared cislunar operations a mission priority in early 2026

What Cislunar Space Actually Is

There’s a word that has quietly taken over the vocabulary of space agencies, defense planners, and venture capitalists alike: cislunar. It sounds technical, even obscure. But the concept it describes is both straightforward and enormously consequential.

Cislunar space refers to the vast volume of space between Earth and the Moon, encompassing the Moon’s orbit and the five Lagrange points of the Earth-Moon gravitational system. The word itself comes from the Latin “cis,” meaning “on this side of.” Taken literally, it means “on this side of the Moon” — though in practice it includes the Moon itself and extends slightly beyond it to capture every gravitationally significant location in the Earth-Moon neighborhood. Cislunar space is typically defined as the region beyond geosynchronous orbit, which sits approximately 35,786 kilometres above Earth’s equator, out to the Moon and its associated Lagrange points.

The scale is genuinely difficult to grasp. The Moon orbits Earth at an average distance of roughly 384,400 kilometres, fluctuating between about 363,300 kilometres at closest approach and 405,500 kilometres at farthest. The L2 Lagrange point, sitting on the far side of the Moon from Earth, adds another 61,347 kilometres to the outer boundary. Low Earth orbit, where the International Space Station operates and where the bulk of humanity’s satellite infrastructure lives, ranges from 160 to 2,000 kilometres up. Cislunar space encompasses a volume 1,728 times larger than the space contained within geosynchronous orbit. It is, by any measure, an enormous territory.

Within that territory, several distinct orbital regimes matter enormously to engineers and mission planners. Low lunar orbit, hugging the Moon’s surface at altitudes typically below 100 kilometres, offers the most direct access to the surface but demands continuous fuel expenditure to maintain. At the opposite extreme, distant retrograde orbits loop far from the Moon in a highly stable configuration that requires almost no station-keeping, but their distance makes them poor staging points for surface access. Between these extremes lies the near-rectilinear halo orbit (NRHO), a highly elongated loop that passes within about 1,500 kilometres of the lunar north pole at its closest and swings out to roughly 70,000 kilometres at its farthest. The NRHO’s seven-day period keeps a spacecraft in near-continuous line of sight with Earth, eliminating communications blackouts, while its shape provides periodic close access to the lunar south pole region where water ice is believed to be concentrated.

The Lagrange points themselves deserve particular attention. Five locations exist where the combined gravitational pull of Earth and the Moon keeps a smaller object, like a spacecraft, in a stable equilibrium relative to both bodies. L1 sits between Earth and the Moon; L2 on the far side of the Moon; L3 on the opposite side of Earth from the Moon. These three points are technically unstable, requiring small periodic corrections to maintain position. The L4 and L5 points, by contrast, are naturally stable, sitting at the tips of equilateral triangles formed with Earth and the Moon. A spacecraft placed at L4 or L5 will remain there indefinitely without fuel expenditure, making these locations highly attractive for long-duration infrastructure. China’s Queqiao-1 relay satellite, launched in 2018 and placed in a halo orbit around L2, was the first operational use of a cislunar Lagrange orbit, enabling communications with the Chang’e 4 lander on the Moon’s permanently Earth-hidden far side.

Why It Matters So Much Right Now

Humanity has technically operated in cislunar space since 1959, when the Soviet Union’s Luna 1 became the first spacecraft to escape Earth’s gravity and pass near the Moon. The Apollo program sent twelve astronauts to the lunar surface between 1969 and 1972. But for decades after Apollo 17’s departure, cislunar space was essentially empty. The region beyond geostationary orbit saw almost no operational activity. That has changed dramatically, and the pace of change is accelerating.

Several converging factors explain the sudden urgency. The first is water ice. When NASA confirmed in 2018 that water ice exists in the permanently shadowed craters near the lunar poles, it fundamentally altered the calculus of long-duration lunar operations. Ice can be melted to provide drinking water, separated into oxygen for breathing, and split into hydrogen and oxygen for rocket propellant. The ability to manufacture fuel at the Moon rather than launching it from Earth changes the economics of deep-space exploration in a significant way. Leaving Earth’s gravity well requires roughly six times the energy needed to depart from the Moon. A cislunar economy anchored in lunar propellant production could, in theory, slash the cost of missions to Mars and beyond by an order of magnitude. This insight has made the Moon’s south polar region among the most coveted real estate in the solar system.

The second driver is strategic competition. China has built a serious space program over the past two decades, and its trajectory in cislunar space is now impossible to ignore. The Chang’e 5 mission returned lunar samples from the near side in December 2020; Chang’e 6, in June 2024, became the first mission in history to return samples from the far side of the Moon, landing in the Apollo Basin. Both missions demonstrated a technical maturity that caught many observers off guard. China has stated clearly its intent to land humans on the Moon by 2030 and has launched the International Lunar Research Station (ILRS) initiative alongside Russia, a program now with participation agreements from more than 13 countries and dozens of institutions. The ILRS has a stated target of completing a basic version of a permanent south polar base by 2035.

The Lagrange points, particularly the stable L4 and L5 positions, have taken on strategic significance beyond their engineering utility. A nation with assets positioned at these points gains persistent observation of the entire cislunar volume. In a future conflict, denying adversary access to the Moon — potentially a future source of rare earth elements, helium-3, and propellant — becomes a conceivable military objective. This is not idle speculation. The U.S. Air Force Research Laboratory has funded a program called Oracle specifically to develop cislunar space domain awareness satellites, with the first spacecraft expected to launch in 2027 from a Lagrange point. The U.S. Space Force formally acknowledged the need to integrate cislunar capabilities in its planning structure in early 2026, with Thomas Ainsworth, performing the duties of Assistant Secretary of the Air Force for Space Acquisition, stating in March 2026 that “we are serious about that” and announcing plans to establish dedicated leadership positions for cislunar operations.

The third and perhaps most commercially compelling factor is the potential for a lunar economy. The extraction of helium-3, an isotope rare on Earth but estimated to be abundant in lunar regolith and valued at approximately $20 million per kilogram, has attracted startup interest and DARPA research contracts. Beyond helium-3, rare earth elements concentrated in lunar rock could supplement terrestrial supply chains that currently depend heavily on Chinese mining operations. The cislunar infrastructure market was valued at approximately $13.84 billion in 2025 and is forecast to reach roughly $24.83 billion by 2032, growing at a compound annual growth rate of around 8.7 percent. A separate assessment of the lunar resource extraction market placed its 2024 value at $1.42 billion, with expected CAGR of 17.3 percent through 2033. Market forecasts for cislunar activity vary considerably depending on assumptions, and whether any of these numbers will prove accurate is uncertain. The history of space commerce is littered with optimistic projections that failed to materialize on schedule.

Current Status: Where Things Stand in April 2026

The clearest marker of how seriously the world now takes cislunar space is what is happening right now. As of April 4, 2026, four astronauts are traveling through cislunar space for the first time since the final Apollo mission over 53 years ago.

Artemis II launched from Kennedy Space Center’s Launch Complex 39B on April 1, 2026 at 6:35 p.m. Eastern time, carrying NASA Commander Reid Wiseman, Pilot Victor Glover, Mission Specialist Christina Koch, and Canadian Space Agency Mission Specialist Jeremy Hansen aboard the Orion spacecraft. The approximately 10-day mission will take the crew on a 685,000-mile free-return trajectory around the Moon, with a closest approach to the lunar surface planned for April 7. The crew is expected to splash down off the coast of San Diego, California on April 10. By the mission’s peak distance, the crew will surpass the farthest distance from Earth any human has ever traveled, beating the record set by the Apollo 13 crew in 1970 by approximately 3,366 statute miles.

Artemis II is a test flight. Its primary purpose is to validate Orion’s life support systems, thermal management, navigation capabilities, and communication links with humans actually aboard — systems that were tested robotically during Artemis I in November 2022 but never with a live crew. The mission does not include a lunar landing; the crew will fly around the Moon and return to Earth. The scientific and operational data gathered will lay the foundation for everything that follows.

The broader Artemis program has undergone significant restructuring in 2026. The Lunar Gateway, which was for years the centerpiece of NASA’s cislunar infrastructure strategy — a small space station planned for the near-rectilinear halo orbit as an assembly and staging point for lunar surface missions — was paused in its current form in March 2026 and will not proceed as originally designed. NASA Administrator Jared Isaacman announced on March 24, 2026, that the agency will instead pursue a phased program to build a permanent lunar surface base directly, targeting initial astronaut landings through a revised mission architecture. Artemis III, now scheduled for mid-2027, will test an integrated landing system in Earth orbit rather than landing on the Moon. Artemis IV, targeting early 2028, is now designated as the first crewed lunar landing mission. NASA has announced a goal of landing crews twice per year once the infrastructure matures.

The Gateway cancellation has created real friction with international partners. The European Space Agency had invested substantially in hardware for the station, including the Lunar I-Hab habitation module, the Lunar View logistics module, and the Lunar Link telecommunications element. Airbus, which was building the power management and distribution system for Gateway’s HALO module, reportedly learned of the program pause during NASA’s public announcement. ESA is expected to announce in June 2026 how it will proceed and what fate the Gateway hardware will take. Some elements may be repurposed; for instance, the station’s Power and Propulsion Element is under discussion for use on a proposed Mars nuclear propulsion mission. The episode has strained trust between NASA and its European partners at a politically delicate moment.

The Commercial Lunar Payload Services (CLPS) program, which contracts commercial companies to deliver science and technology payloads to the lunar surface, continues in parallel. Eight missions have been contracted under the program to date. Astrobotic Technology’s Peregrine lander, the first CLPS mission, experienced a fuel leak in January 2024 and did not achieve its intended landing. Intuitive Machines’ IM-1 Nova-C lander did touch down near the lunar south pole in February 2024, becoming the first American spacecraft to soft-land on the Moon since Apollo 17. In 2026, NASA has proposed a “CLPS 2.0” initiative to expand the program’s scope. ispace-U.S. received additional funding in March 2025 under its existing contract to deliver NASA payloads, and Blue Origin has a contract for a 2025-2026 mission delivery valued at $6.1 million with a rover deployment follow-on in 2027.

China’s trajectory meanwhile continues at pace. The Chang’e 7 mission, scheduled for launch around 2026, will place an orbiter, lander, rover, and a small aerial probe at the lunar south pole for detailed resource surveys, carrying six international scientific instruments. Chang’e 8, targeting launch in 2029, will test in-situ resource utilization technologies on the surface, including 3D printing structures from lunar soil, and will carry Pakistan’s first lunar rover as part of a signed agreement with CNSA from February 2025. The Queqiao-2 relay satellite, deployed in March 2024 in a highly elliptical lunar orbit, is now providing continuous communications support for Chinese missions. China is also studying a constellation of interplanetary relay and navigation satellites extending eventually to Mars and Venus.

Beyond the U.S. and China, the competitive and cooperative cislunar picture involves a wide range of actors. As of January 26, 2026, 61 countries have signed the Artemis Accords — the non-binding framework of principles for responsible lunar exploration initiated by NASA and the U.S. Department of State. The Accords were first signed on October 13, 2020 by eight nations; Oman became the 61st signatory in January 2026. Russia and China have not signed, with Russia characterizing the framework as a U.S.-led structure outside United Nations processes, and U.S. legislation restricting NASA from bilateral cooperation with Chinese entities making Chinese participation legally complicated. India, which became the first nation to land a rover at the lunar south pole with Chandrayaan-3 in August 2023, has signed the Accords and is planning Chandrayaan-4, a sample return mission, for launch between 2026 and 2028. Japan is partnering with India on a lunar lander and has agreed to provide a pressurized rover for NASA’s lunar surface architecture.

The Infrastructure Challenge

All the ambition surrounding cislunar space runs into a fundamental problem: the infrastructure needed to operate there routinely barely exists yet.

Getting to cislunar space is harder than it looks. From Earth’s surface to geostationary orbit requires roughly 10.4 kilometres per second of velocity change, or “delta-v,” in the standard measure of propulsion cost. From geostationary orbit to the Moon adds another approximately 1.5 kilometres per second, but the orbital mechanics in the region between GEO and the Moon are chaotic and energy-sensitive in ways that low Earth orbit simply isn’t. A 2025 study by Lawrence Livermore National Laboratory that modeled one million distinct orbital trajectories throughout cislunar space found that only about 9.7 percent remained stable over a six-year period. The gravitational interplay of Earth, Moon, and Sun creates a dynamically complex environment where small perturbations can cascade into large deviations.

Navigation is an equally serious gap. GPS signals degrade with distance and become unusable beyond a few tens of thousands of kilometres from Earth. Astronauts and robotic spacecraft in cislunar space need dedicated navigation and communications infrastructure, effectively a “GPS for the Moon.” The concept of placing navigation relay satellites at or near the Earth-Moon Lagrange points was first proposed by researcher Robert Farquhar in 1969, but no such operational constellation exists today. Lockheed Martin’s Crescent Space Services, established in March 2023, offers the Parsec network as a commercial cislunar communications and navigation service, with initial deployment linked to upcoming lunar missions. ESA’s proposed LEMO-TD demonstration mission, put forward at the 2025 Ministerial Council, would test systems for locating and tracking artificial objects in cislunar orbits. These are first steps toward a coherent architecture, but the architecture itself remains incomplete.

Traffic management is emerging as a genuine operational concern. A peer-reviewed study published in the Journal of Spacecraft and Rockets in March 2025 by researchers at the Georgia Institute of Technology found that because most missions gravitate toward the same narrow selection of stable orbital regimes — particularly orbits near the Lagrange points — the probability of close approaches grows surprisingly quickly with the number of active missions. Unlike Earth orbit, where tracking networks have decades of refinement behind them, most existing ground-based sensors can’t consistently detect spacecraft in cislunar space due to the extreme distances involved and the optical interference caused by the Moon’s reflected light. The United Nations Committee on the Peaceful Uses of Outer Space formed a coordination team in February 2025 to begin addressing traffic management and safety norms. NASA has established an internal tracking program that compares individual operators’ mission trajectories to identify potential close approaches, but this represents coordination infrastructure, not authority.

Power, propulsion, and in-space transportation make up a third infrastructure layer still under development. To sustain operations across the cislunar volume, reusable spacecraft capable of moving cargo and crew between Earth orbit, Lagrange points, and the lunar surface are needed — a class of vehicle sometimes called a “space tug.” Blue Origin’s Blue Ring is designed as a multi-mission vehicle with a nominal delta-v of at least 3,000 metres per second and payload capacity across 13 ESPA ports, targeting operations in geostationary orbit, cislunar space, and beyond, with its first mission planned for 2026. True Anomaly, a national security space startup, announced its Jackal spacecraft for GEO and cislunar operations in 2026, featuring a 20-thruster propulsion system designed for the unique thermal and communications challenges of the cislunar environment.

The Governance Gap

The political dimension of cislunar space is arguably as complicated as the technical one, and considerably less tractable.

The Outer Space Treaty of 1967 forms the bedrock of international space law. It prohibits national appropriation of the Moon and other celestial bodies by claim of sovereignty, use, occupation, or any other means. What it doesn’t clearly address is whether private entities can own resources extracted from celestial bodies — a question with enormous economic consequences. The Artemis Accords attempt to bridge this gap, affirming the right to extract and use space resources under existing international law while committing signatories to transparency, debris mitigation, and safety zones around operating assets. Critics, including some international legal scholars, argue that the Accords effectively extend U.S. domestic space property rights — codified in the U.S. Commercial Space Launch Competitiveness Act of 2015 — into an international normative framework that was never negotiated multilaterally. China and Russia have declined to participate and have proposed the ILRS as an alternative framework, creating the prospect of parallel and potentially conflicting governance regimes operating simultaneously in the same physical space.

The situation is complicated by the fact that no existing treaty or international body has the legal authority to enforce traffic coordination, establish safety zones, or adjudicate resource claims in cislunar space. Some countries, notably Thailand and Senegal, have signed both the Artemis Accords and the ILRS partnership documents, hedging diplomatically between the two systems. The White House released the first National Cislunar Science and Technology Strategy in November 2022, followed by updated guidance and a January 2026 executive order describing U.S. military space responsibilities as extending from very low Earth orbit through cislunar space. These domestic policy instruments can direct U.S. government behavior, but they can’t bind other nations. The world may be heading toward a cislunar domain without agreed rules of the road, and the consequences of that absence could become consequential well before permanent infrastructure is in place.

Resources That Could Define an Economy

The economic case for cislunar investment rests heavily on what the Moon actually contains, and some of that inventory is only now being mapped in useful detail.

Water ice stands as the most immediately valuable resource. The LCROSS mission in 2009 confirmed water in the ejecta plume from a deliberate impact into the Cabeus crater near the south pole. Subsequent orbital mapping, particularly from India’s Chandrayaan-1 and NASA’s Lunar Reconnaissance Orbiter, has identified multiple permanently shadowed regions where ice may have accumulated over billions of years. The actual quantity and accessibility of that ice remains a serious open question — deposit depths, purity, and extraction feasibility under extreme cold conditions are all unknown at the precision required for commercial planning. Chang’e 7’s south pole resource survey, when it flies, and the sample and in-situ analysis work planned for Chandrayaan-4 should sharpen the picture.

Helium-3 is the more speculative prize. This isotope, implanted in lunar regolith by billions of years of solar wind bombardment, is extremely rare on Earth but potentially abundant on the Moon. It has been proposed as fuel for future nuclear fusion reactors — a technology that remains commercially unproven as of 2026 — and as a coolant for quantum computing systems. Ouyang Ziyuan, long the chief scientist of China’s lunar exploration program, has repeatedly emphasized helium-3 as a strategic motivation for China’s Moon program. The arithmetic is attractive: even a modest extraction operation could theoretically supply significant quantities of a material priced at approximately $20 million per kilogram.

Rare earth elements in lunar rock and regolith represent a third category of potential value. Current global supply chains for these materials, used extensively in electronics, defense systems, and clean energy technology, are heavily concentrated in Chinese mining operations. A lunar source could provide strategic supply diversification, though the cost of extraction and transport from the Moon to Earth would need to fall dramatically before the economics work. The DARPA NOM4D program explicitly considers on-orbit manufacturing from extracted lunar materials, suggesting at least some interest in processing resources in space rather than transporting raw ore back to Earth.

Commercial Players Building the Foundation

The private sector is arriving in cislunar space with a mixture of concrete projects and ambitious visions, and sorting the two categories requires some care.

SpaceX dominates any discussion of cislunar commercial capability by virtue of Starship, its super-heavy-lift launch system. NASA has contracted SpaceX’s Starship Human Landing System variant to carry Artemis astronauts from lunar orbit to the surface and back. The architecture requires orbital propellant transfer — multiple Starship tanker launches to fill a depot before the crewed mission, a technically demanding sequence that SpaceX has been working to demonstrate. Orbital refueling tests were progressing in 2025, and the system’s readiness will be a primary determinant of when Artemis IV achieves its first crewed lunar landing.

Blue Origin received a $3.4 billion NASA contract in May 2023 for its Blue Moon lunar lander, designated as a second human landing option alongside SpaceX. Blue Ring, the company’s in-space mobility platform, positions Blue Origin for a broader role across the cislunar domain beyond any single landing mission.

Astrobotic Technology and Intuitive Machines are the two most commercially active CLPS providers. Intuitive Machines followed its IM-1 success with the IM-2 mission, which launched in February 2025, carrying a drill to search for subsurface ice at the south pole, though the lander tipped over on landing and some experiments couldn’t be completed as planned. The company continues to operate under NASA contracts and is developing a follow-on lander.

Lockheed Martin’s Crescent Space Services is targeting communications and navigation as the first layer of cislunar infrastructure, a sound commercial strategy given that every other mission depends on reliable connectivity. CisLunar, a startup working with DARPA, is exploring how to turn space debris and lunar regolith into metal propellant, positioning itself as the steel mill in a future lunar economy. Mission Control Space Services, a Canadian company, has expanded its operational support capabilities to include cislunar missions, adding a Canadian commercial presence to the infrastructure picture.

True Anomaly’s Jackal spacecraft, targeting both GEO and cislunar operations in 2026, represents a national security commercial offering — built specifically for the autonomy, thermal resilience, and high-bandwidth communication demands of the cislunar environment. The company sees the defense market as the earliest viable customer for cislunar spacecraft, given that government agencies currently have the most immediate operational need for capability in the region.

What Comes After the First Footprints

The near-term roadmap for cislunar space is now clearer than it has been at any point since the Apollo era, even if individual programs remain subject to delays and political winds.

NASA’s revised Artemis architecture, as announced March 24, 2026, describes a phased approach to building a permanent lunar base. The first phase focuses on using CLPS deliveries and a Lunar Terrain Vehicle to send rovers, instruments, and technology demonstrations to the surface, building operational knowledge ahead of crewed landings. The second phase moves toward semi-permanent infrastructure with astronaut visits supported by commercially procured hardware and international contributions including JAXA’s pressurized rover. The third phase, contingent on cargo-capable human landing systems coming online, would deliver the heavy infrastructure for a continuous human presence — pressure modules, power systems, and logistics support for crews that could eventually stay for months rather than days.

China’s parallel program will reach important milestones over roughly the same period. Chang’e 7 conducts the most detailed survey of lunar south polar resources attempted to date. Chang’e 8 will test actual in-situ manufacturing. A crewed Chinese lunar mission is targeted for 2030. The ILRS is targeting a basic operational version of its south polar base by 2035. If both the Artemis and ILRS timelines hold, the Moon’s south polar region could see assets from two competing geopolitical coalitions operating within a few hundred kilometres of each other sometime in the early 2030s, without any agreed framework for managing that proximity.

A longer-term priority, recognized across the U.S. National Cislunar Science and Technology Strategy, is the development of interoperable communications and navigation infrastructure — a cislunar equivalent of the GPS and internet protocols that underpin terrestrial commerce. Without shared navigation standards, frequencies, and data formats, cislunar space will develop in incompatible silos, raising costs for everyone and increasing collision and interference risks. The strategy explicitly calls for scalable and interoperable cislunar positioning, navigation, and timing capabilities, though the institutional path to achieving that interoperability across commercial, civil government, military, and international operators remains undefined.

The Debris and Safety Question Nobody Has Answered

There is one topic in cislunar space that the industry tends to treat as a future problem rather than a present one, despite mounting evidence that it demands attention now.

Space debris in low Earth orbit has been studied for decades, with international guidelines, active mitigation requirements, and a growing commercial debris-removal industry. In cislunar space, essentially none of that architecture exists. Objects in stable cislunar orbits, particularly the Lagrange points and NRHOs, could remain there for an extraordinarily long time — potentially thousands of years — without natural orbital decay. A collision or fragmentation event in one of these stable regions could render it unusable for generations by spreading debris throughout a volume that spacecraft must traverse to reach the Moon. Because the most desirable cislunar orbits are also the most limited in number, congestion effects compound quickly. The European Space Policy Institute released a report in 2025 urging Europe to treat cislunar safety as a strategic priority, citing the absence of end-of-life disposal rules, tracking capability gaps, and space weather vulnerability as immediate concerns. The ESA’s Space Safety Programme has developed pre-operational space weather services for cislunar environments but nothing approaching the traffic management and debris mitigation infrastructure that Earth orbit already has — imperfectly — in place. Whether the international community moves to establish governance in this area before operations scale, or scrambles to address consequences after the first serious incident, remains genuinely open.

Summary

Cislunar space has moved from the periphery of space policy to its center with remarkable speed. As of April 2026, humanity is physically present in that region for the first time in over five decades, with the Artemis II crew completing a historic free-return trajectory around the Moon. Behind that headline event lies a dense web of strategic programs, commercial ventures, and international competitions that together define a new era of human activity between Earth and the Moon.

The Moon’s south polar water ice makes a cislunar economy plausible in ways it simply wasn’t before 2018. The convergence of U.S. and Chinese human spaceflight programs, both targeting lunar landings within a few years of each other, makes the geopolitical dimension inescapable. The gap between the pace of activity and the maturity of governance, navigation infrastructure, debris management, and traffic coordination makes it potentially precarious. What happens in cislunar space over the next decade will set precedents and establish patterns of behavior that could govern the next century of human activity beyond Earth — a high-stakes interval that the world has only recently begun treating with the seriousness it deserves. In this sense, the question isn’t whether cislunar space matters. The question is whether the decisions being made now will look wise in hindsight.

Appendix: Top 10 Questions Answered in This Article

What exactly is cislunar space?

Cislunar space is the region between Earth and the Moon, extending from beyond geostationary orbit — approximately 35,786 kilometres above Earth’s equator — out to the Moon’s orbit and the five Earth-Moon Lagrange points. It covers a volume 1,728 times larger than the space contained within geostationary orbit. The term comes from the Latin “cis,” meaning “on this side of.”

Why are the Lagrange points strategically important?

The five Earth-Moon Lagrange points are locations where gravitational forces allow a spacecraft to maintain position relative to both Earth and the Moon with minimal fuel. The stable L4 and L5 points require no station-keeping at all. These locations are valuable for communications relays, space domain awareness satellites, refueling depots, and long-duration space stations, making them highly contested future real estate.

What is the Artemis II mission and why is it happening now?

Artemis II launched on April 1, 2026, carrying NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch alongside Canadian astronaut Jeremy Hansen on a 10-day free-return trajectory around the Moon. It is the first crewed mission beyond low Earth orbit in more than 50 years. Its primary purpose is to validate the Orion spacecraft’s life support systems, navigation, and communications with humans aboard, building on the uncrewed Artemis I mission of 2022.

What happened to the Lunar Gateway space station?

NASA paused the Lunar Gateway in its originally planned form in March 2026. The program, which would have placed a modular space station in near-rectilinear halo orbit around the Moon, was ended after escalating costs and shifting priorities under NASA Administrator Jared Isaacman. NASA has instead announced a phased plan to build a permanent lunar surface base, and is exploring repurposing some Gateway hardware for other missions, including a proposed Mars nuclear propulsion mission.

Why is water ice at the lunar south pole so economically important?

Lunar water ice, confirmed in permanently shadowed craters near the south pole, can be split into hydrogen and oxygen using solar power. The hydrogen and oxygen serve as rocket propellant, while the water and oxygen also support human life support systems. Producing propellant on the Moon rather than launching it from Earth dramatically reduces the energy cost of deep-space missions, since leaving Earth’s surface requires roughly six times the energy needed to depart from the Moon.

What is China’s cislunar program?

China’s cislunar program includes the Chang’e robotic exploration series, with Chang’e 6 returning far-side lunar samples in June 2024, Chang’e 7 planned for 2026 to survey south polar resources, and Chang’e 8 targeting 2029 for in-situ resource utilization tests. China and Russia co-lead the International Lunar Research Station initiative, which targets completion of a basic south polar base by 2035. China has stated its intent to land humans on the Moon by 2030.

What are the Artemis Accords?

The Artemis Accords are a set of non-binding multilateral principles for civil space exploration, drafted by NASA and the U.S. Department of State, that address transparency, data sharing, debris mitigation, interoperability, and resource use rights. As of January 26, 2026, 61 nations had signed, including most Western spacefaring nations. China and Russia have not signed, and have developed a separate governance framework for their ILRS program.

What commercial companies are active in cislunar space?

Active commercial participants include SpaceX, which is developing the Starship Human Landing System for NASA’s Artemis program; Blue Origin, which holds a $3.4 billion NASA contract for its Blue Moon lander and is developing the Blue Ring in-space mobility platform; Astrobotic Technology and Intuitive Machines as commercial lunar payload delivery providers; and Lockheed Martin’s Crescent Space Services, which is building the Parsec cislunar communications and navigation network. Defense-focused companies including True Anomaly are developing autonomous spacecraft specifically for cislunar security operations.

What is cislunar space domain awareness and why does the U.S. military care?

Cislunar space domain awareness refers to the ability to detect, track, and characterize objects operating throughout the Earth-Moon system. Most existing ground-based sensors can’t reliably monitor spacecraft so far from Earth. The U.S. Space Force and Air Force Research Laboratory have identified this as a national security gap, since adversary spacecraft could potentially operate in cislunar space without detection. The Air Force Research Laboratory’s Oracle program is developing dedicated space-based sensors, with the first satellite expected to launch in 2027.

What are the main governance challenges in cislunar space?

No binding international framework specifically regulates activities in cislunar space. The 1967 Outer Space Treaty prohibits national appropriation of celestial bodies but doesn’t clearly address private resource extraction. The Artemis Accords provide voluntary principles but lack enforcement mechanisms and are not accepted by China or Russia. There are currently no agreed traffic coordination rules, debris disposal requirements, or resource claim procedures for cislunar operations, creating a regulatory vacuum as activity accelerates.