An old treaty system meets a new lunar economy
For decades, space law rested on a compact set of multilateral agreements negotiated during the Cold War. The 1967 Outer Space Treaty remains the foundation, establishing that outer space is free for exploration and use by all states, is not subject to national appropriation, and must be used with due regard for the interests of others. Later agreements addressed rescue obligations, liability, registration and the governance of activities on the Moon. Yet the architecture was designed for a world in which only a handful of governments could reach orbit, let alone the lunar surface.
That world has passed. National agencies are planning sustained lunar operations. Commercial actors are building launch, communications, remote-sensing and in-space logistics capabilities. Strategic competition has widened, while scientific and economic interest in cislunar space has sharpened. The legal framework is therefore being tested not because it has vanished, but because it was drafted at a high level of abstraction. Its principles are durable; their application is not straightforward.
The result is a policy shift from treaty-writing to interpretation, implementation and norm-building. States are increasingly setting out how they understand existing obligations, while domestic legislation, bilateral arrangements and technical standards are filling practical gaps. Whether this produces a stable order or a fragmented one will depend on how these interpretations harden into practice.
The issue is not the absence of law in space, but the accelerating competition to define how existing law applies to new kinds of activity.
The enduring force and ambiguity of the Outer Space Treaty
The Outer Space Treaty is often invoked as both shield and sword in contemporary debates. Article I declares outer space the province of all humankind and guarantees free exploration and use. Article II prohibits national appropriation by claim of sovereignty, use or occupation, or any other means. Article VI makes states internationally responsible for national activities in outer space, including those conducted by non-governmental entities, which must be authorised and continually supervised. Article IX requires due regard and consultation where activities could cause harmful interference.
These provisions are broad enough to remain relevant, but broad enough to generate disagreement. Does the freedom to use space include extracting and owning resources once removed from a celestial body? Can safety measures around installations be reconciled with the bar on appropriation? How far does a state's obligation of continuing supervision extend when private operators undertake complex missions involving foreign partners, subcontractors and in-orbit autonomy?
Much depends on legal interpretation. The treaty clearly rules out sovereign claims over the Moon or asteroids. It says less explicitly about ownership of extracted resources, though many lawyers draw an analogy with fishing on the high seas: no one owns the sea, but fish lawfully caught may become property. Others argue that the analogy is imperfect because celestial resources are finite, unevenly distributed and deeply entangled with strategic access. The debate has become a central fault line in space policy.
The Moon Agreement matters even in partial failure
The 1979 Moon Agreement is often described as marginal because the major spacefaring powers have not ratified it. That is true institutionally, but incomplete analytically. The agreement sought to elaborate rules for the Moon and other celestial bodies, including peaceful use, environmental protection and the concept that natural resources are the common heritage of humankind. It also envisaged an international regime to govern resource exploitation when such exploitation became feasible.
The issue is not the absence of law in space, but the accelerating competition to define how existing law applies to new kinds of activity.
Its limited uptake reflected political concerns that its resource provisions were too indeterminate and potentially too redistributive for states investing heavily in space capabilities. Yet the questions it posed have not disappeared. On the contrary, they have returned in a more concrete form as lunar prospecting, polar ice mapping and plans for sustained surface operations become more credible. The agreement serves as a reminder that disputes over extraction were foreseen long before today’s commercial enthusiasm.
Even without broad ratification, the Moon Agreement influences the debate by setting out one possible model: multilateral resource governance before large-scale exploitation. Opponents favour a more incremental approach in which states recognise property rights in extracted materials under domestic law while relying on existing treaty principles to prevent territorial claims. The policy argument is therefore less about whether the Moon Agreement will govern the future than about whether its central concern—how benefits and access should be managed—can be avoided.
Resources, ownership and the politics of first access
Resource use is where legal abstraction collides with operational reality. Water ice near the lunar poles could support life support systems and, after processing, provide hydrogen and oxygen for fuel. Regolith may be useful for shielding or construction. Rare materials are often discussed, sometimes unrealistically, but the more immediate value lies in reducing the cost of operating beyond Earth by using local resources.
Several states have adopted laws recognising rights over resources extracted by their nationals, while insisting that such laws do not assert sovereignty over celestial bodies. This legal distinction may be defensible under one reading of the Outer Space Treaty, but it also creates a practical dilemma. If access to a particular site is scarce, and if one operator establishes infrastructure there first, control over the resource may flow from de facto exclusion rather than formal ownership. The law may deny appropriation in theory while tolerating it in practice.
That is especially salient at the lunar south pole, where permanently shadowed regions are thought to contain water ice and where areas with favourable illumination are limited. The combination of scientific value, logistical utility and geographic scarcity means that sequencing matters. Early arrivals may shape facts on the ground—or rather, on the regolith—through infrastructure placement, traffic patterns and technical dependencies. In such conditions, transparency and coordination are not optional extras; they are substitutes for a missing adjudicatory regime.
On the Moon, the hardest legal disputes are likely to arise not from grand declarations of ownership, but from ordinary operational decisions that make access easier for some and harder for others.
Safety zones and the fine line between coordination and exclusion
One of the most contested policy innovations in recent years has been the idea of safety zones around lunar activities. The basic rationale is straightforward. Space operations are fragile, dust can damage equipment, landing and launch create hazards, and proximity can generate harmful interference. Article IX of the Outer Space Treaty already requires due regard and consultation; safety zones can be presented as an operational tool to meet those obligations.
Critics worry that such zones could become functional territorial claims by another name, particularly in areas where usable terrain is limited. If a state or operator can define a perimeter that others are expected to avoid, and if that perimeter is repeatedly expanded or prolonged, non-appropriation may be eroded through practice. Supporters respond that the alternative—no agreed mechanisms for deconfliction—is worse, and that transparent, temporary, technically justified measures are compatible with the treaty.
The legal merit of safety zones therefore hinges on design. Are they narrowly tailored to actual risk? Are their coordinates, duration and purpose publicly notified? Is there a process for consultation and challenge? Do they facilitate access by reducing danger, or suppress access by monopolising key locations? These questions are less dramatic than sovereignty rhetoric, but more likely to determine whether governance arrangements command legitimacy.
Responsibility and liability in an age of private operators
On the Moon, the hardest legal disputes are likely to arise not from grand declarations of ownership, but from ordinary operational decisions that make access easier for some and harder for others.
The rise of private space activity has not displaced the state; it has made the state more legally central. Under Article VI of the Outer Space Treaty, states bear international responsibility for national activities in outer space whether undertaken by governmental or non-governmental entities. The Liability Convention supplements this framework by establishing liability rules for damage caused by space objects, including absolute liability for damage on the surface of the Earth and fault-based liability in space.
These principles were crafted with launches and satellites in mind, not dense ecosystems of contractors, joint ventures, hosted payloads and autonomous systems operating across multiple jurisdictions. Licensing regimes on Earth are consequently carrying more weight. States must decide how to authorise, supervise and, where necessary, restrain private conduct that may create international consequences. The variation among national frameworks is becoming a strategic variable in its own right.
There is a further difficulty. Liability rules are easier to state than to apply in complex, distributed operations. If a lunar lander kicks up debris that damages another operator’s equipment, what counts as fault? If navigation data are wrong because several suppliers contributed to an error chain, which state bears responsibility? And if a mission relies on software updates transmitted across borders, where does effective control lie? None of these questions renders the legal regime unworkable. But each points to the growing need for technical standards, incident reporting and clearer supervisory expectations.
Registration, transparency and traffic management beyond orbit
Transparency has long been a stabilising principle in space governance. The Registration Convention requires states to furnish information about space objects launched into Earth orbit or beyond. The United Nations Office for Outer Space Affairs maintains the central register. In practice, however, transparency obligations developed in an orbital era and do not yet amount to a full system for coordinating increasingly complex operations in cislunar space.
As lunar missions multiply, registration alone will not be enough. Operators and regulators will need more granular data on trajectories, communications, intended landing sites, mission duration and potential interference risks. On Earth orbit, the language of space traffic management has become familiar, though global governance remains incomplete. Cislunar space poses a distinct challenge because distances are greater, communications delays differ and the operational environment is less mature.
Policy is therefore moving towards a layered model: formal legal obligations at the treaty level, voluntary guidelines for long-term sustainability, and technical coordination through agencies, standards bodies and mission-specific arrangements. This may sound piecemeal, but it is how many international regimes evolve. The risk is not informality as such; it is inequity if the states with the greatest operational capacity also become the de facto authors of procedure.
Security concerns are shaping civilian legal choices
Space law has always sat close to security policy. The Outer Space Treaty prohibits the placement of nuclear weapons or other weapons of mass destruction in orbit or on celestial bodies, and restricts the Moon and other celestial bodies to peaceful purposes. Yet it does not ban all military uses of space, and many civilian systems have strategic significance. Today, that dual-use character is more pronounced than ever.
Cislunar infrastructure—navigation, communications, surveillance and logistics—could support both scientific exploration and national security objectives. As a result, legal arguments over transparency, interoperability and access cannot be separated from questions of trust. States may favour ambiguity where disclosure could reveal capability or intent. Others may see opacity itself as destabilising. The same landing site can be a scientific objective, a commercial opportunity and a strategic foothold.
This matters because legal development rarely occurs in a geopolitical vacuum. Where confidence is low, states tend to prefer flexible instruments, coalitions of the willing and nationally controlled licensing. That can produce useful progress, but it can also deepen fragmentation. A stable order for lunar activity will require enough predictability to reassure rivals that operational coordination is not a cover for exclusion or military advantage.
In cislunar space, governance will be judged not by the elegance of legal text, but by whether rivals believe that rules constrain behaviour even when strategic stakes rise.
In cislunar space, governance will be judged not by the elegance of legal text, but by whether rivals believe that rules constrain behaviour even when strategic stakes rise.
Planetary protection and environmental stewardship are moving to the centre
Early space law treated environmental concerns largely through the lens of contamination and scientific integrity. Those issues remain important. Article IX of the Outer Space Treaty requires states to avoid harmful contamination of outer space and adverse changes in the environment of the Earth resulting from the introduction of extraterrestrial matter. Planetary protection policies, historically shaped in part through scientific bodies such as the Committee on Space Research, have sought to preserve both research value and biosafety.
But the environmental agenda is broadening. Sustained activity on and around the Moon could generate debris, exhaust effects, dust dispersion, radio-frequency interference and cumulative disturbance of scientifically significant sites. There is also growing interest in preserving heritage locations, including early landing sites, without turning preservation into a pretext for strategic enclosure. Environmental governance on the Moon will therefore have to balance protection, use and access under conditions of uncertainty.
This is an area where soft law may prove influential before hard law does. Guidelines on mission design, waste minimisation, site preservation and data-sharing can shape expectations even without treaty amendment. Over time, consistent practice can crystallise into stronger normative constraints. The challenge is to ensure that stewardship is not defined solely by those who arrive first or possess the most advanced capabilities.
Why soft law is becoming the real battlefield
Formal treaty negotiations are difficult, slow and politically costly. In their place, the international system has increasingly relied on non-binding instruments: principles, guidelines, political commitments and operational arrangements. In space, this turn to soft law is often presented as pragmatic. It allows rules to adapt to fast-changing technology and can secure wider participation than a legally binding text that many states might refuse to ratify.
Yet soft law is not neutral. It can shape expectations, structure cooperation and privilege particular legal interpretations. Once embedded in licensing rules, procurement conditions, mission planning and diplomatic practice, supposedly non-binding norms may become difficult to reverse. That is why debates over consultation standards, interoperability principles, data disclosure and resource-use practices matter so much. They are mechanisms through which legal order is being built incrementally.
The legitimacy question is obvious. If soft law is generated through open, inclusive forums and linked clearly to treaty obligations, it can strengthen the system. If it emerges primarily through clubs of capable states, it may increase operational efficiency while reducing broader acceptance. Space governance is therefore confronting a familiar international problem: effectiveness and universality do not always advance together.
What a workable lunar legal order would require
A durable framework for lunar activity need not begin with a grand constitutional settlement. More plausibly, it will emerge through a combination of reaffirmed treaty principles and targeted practical measures. At minimum, such an order would require clearer notification of missions and sites, transparent criteria for any safety-related coordination zones, robust national supervision of private operators, shared approaches to incident investigation, and mechanisms for consultation when activities risk harmful interference.
It would also require a more explicit conversation about resources. Avoiding the issue is no longer tenable. States do not need to settle every question of distributive justice before activity begins, but they do need common understandings about what counts as lawful extraction, what conduct would amount to de facto appropriation, and how access to scarce areas can remain meaningfully open. Without that, legal disagreement will be converted into operational friction.
There is room for optimism, provided it is disciplined. The core treaty framework still commands broad support. Most states continue to affirm non-appropriation, peaceful use, responsibility and due regard. The task is to translate those commitments into governance that works under conditions of commercial participation and strategic rivalry. The Moon is not beyond the reach of law. The real test is whether law can keep pace with the political economy now taking shape around it.
