When we talk about protecting celestial bodies, we’re not just waxing poetic about pristine craters on the Moon or the rust-red dunes of Mars. We’re stepping into a dense, often overlooked legal architecture that decides who gets to touch, extract, or contaminate these worlds. For countries across Africa, Latin America, Southeast Asia, and small island developing states—regions that have historically been subjects rather than architects of international law—the stakes are existential. The treaties governing celestial bodies will shape not only scientific discovery but also the distribution of off-world resources, the prevention of biological cross-contamination, and the very meaning of peaceful use. This piece walks through the binding and non-binding instruments that make up our current planetary protection regime, with a clear-eyed look at their strengths, their silences, and the pressing need for reform that includes everyone.
The Outer Space Treaty: A Constitution for the Cosmos
The 1967 Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies—the Outer Space Treaty, or OST for short—remains the bedrock of space law. Ratified by over 110 countries, including many from the Global South, it sets out two principles that directly protect celestial bodies. First, Article II prohibits national appropriation by claim of sovereignty, use, occupation, or any other means. Second, Article IX introduces the concept of “harmful contamination” and requires states to conduct their activities with “due regard” to the corresponding interests of all other states. For a nation like Fiji or Nigeria, this language is a shield against a future where powerful spacefaring actors might otherwise treat the Moon as terra nullius.
But the OST is a product of 1967. It was drafted when only two states had launch capability, and its provisions are deliberately broad. The treaty doesn’t define “harmful contamination,” nor does it specify what “due regard” means in practice. This ambiguity has allowed for divergent interpretations. The United States, through the Artemis Accords, interprets the extraction of space resources as permissible under the OST, while some scholars from non-spacefaring nations argue that unilateral extraction without a clear international benefit-sharing mechanism violates the treaty’s spirit. The OST protects celestial bodies by setting a normative floor, but it leaves the ceiling dangerously undefined.
The Moon Agreement: A Bolder Vision, a Lonely Instrument
Adopted in 1979, the Agreement Governing the Activities of States on the Moon and Other Celestial Bodies—the Moon Agreement—tried to fill the OST’s gaps. It explicitly declares the Moon and its natural resources to be the “common heritage of mankind” (Article 11) and calls for the establishment of an international regime to govern exploitation when such exploitation becomes feasible. It also expands environmental protection, requiring states to prevent disruption of the existing balance of the celestial environment and to designate areas of special scientific interest as international scientific preserves.
Despite its progressive vision, the Moon Agreement has been ratified by only a handful of states, none of which are major spacefaring powers. India is the only nation with an active lunar program to have signed (though not ratified) it. For many African and Latin American countries, the Agreement represents a lost opportunity—a framework that could have given them a seat at the table. Its failure to gain traction is a cautionary tale: a treaty that protects celestial bodies too stringently, without the buy-in of the states capable of reaching them, risks becoming symbolic parchment.
Planetary Protection Beyond Resource Rights: The COSPAR Framework
While the OST and Moon Agreement address legal and economic protection, a parallel scientific regime safeguards celestial bodies from biological contamination. The Committee on Space Research (COSPAR), an interdisciplinary scientific body, maintains the Planetary Protection Policy. This policy categorizes missions based on the target body’s potential for life and the type of mission (flyby, orbiter, lander). For example, a Mars lander searching for life must meet stringent sterilization requirements to avoid introducing Earth microbes that could confound results or, worse, irreversibly harm a nascent Martian biosphere.
COSPAR’s policy is not a treaty; it’s a scientific standard. However, it derives legal force from Article IX of the OST, which obliges states to avoid harmful contamination. This interplay between hard law and soft scientific norms is a unique feature of space governance. For nations with emerging space programs, such as Nigeria or Brazil, adhering to COSPAR standards is both a scientific necessity and a diplomatic signal of responsible behavior. Yet the policy was largely shaped by established space agencies. As more countries develop interplanetary missions, the question arises: whose interpretation of “harmful contamination” will prevail, and will the voices of biodiverse-rich equatorial nations—who understand terrestrial contamination risks intimately—be heard?
Forward Contamination vs. Backward Contamination: Asymmetrical Risks
Planetary protection distinguishes between forward contamination (Earth to space) and backward contamination (space to Earth). The legal framework is asymmetrical. Forward contamination is governed by the OST and COSPAR policy, with the primary concern being the preservation of science and celestial environments. Backward contamination—the theoretical risk of bringing a harmful extraterrestrial organism to Earth—is addressed only briefly in the OST’s Article IX, which requires states to “adopt appropriate measures.” There is no detailed international protocol for sample-return missions, despite the fact that both Japan’s Hayabusa missions and NASA’s OSIRIS-REx have already returned asteroid samples, and Mars sample return is planned for the next decade.
This gap should concern all nations, but especially those in the Global South. Historically, environmental risks have been disproportionately externalized to poorer regions. If a sample-return mission were to result in a containment breach, the legal and financial liability framework is virtually non-existent. The OST’s state responsibility clause (Article VI) and liability convention apply to damage caused by space objects, but it is unclear whether a microscopic organism would qualify as a “space object.” This ambiguity leaves small island states and developing nations—often the most vulnerable to environmental shocks—without clear recourse.
Artemis Accords: A New Governance Layer or a Parallel Regime?
The Artemis Accords, initiated by NASA in 2020 and now signed by over 30 nations, represent the most significant recent development in celestial body protection. The Accords operationalize the OST for contemporary lunar exploration, including provisions on transparency, interoperability, emergency assistance, and the preservation of space heritage. Section 11 explicitly requires signatories to protect “sites of historic significance,” such as Apollo landing sites, and to conduct missions in a manner that avoids harmful interference.
However, the Accords are not a treaty; they are bilateral agreements between the United States and each signatory. This has generated debate about their relationship to the multilateral treaty system. Critics, including some legal scholars from Latin America, argue that the Accords’ endorsement of space resource extraction undermines the OST’s common heritage principle and bypasses the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS), where all nations have a voice. Proponents counter that the Accords provide practical, actionable guidelines that the OST lacks. For African and Southeast Asian signatories like Rwanda and Singapore, the Accords offer a pathway to participate in lunar exploration, but they also raise questions about whether such participation will translate into meaningful influence over the rules that govern celestial bodies.
Space Heritage: Protecting Apollo and Beyond
The protection of space heritage sites—such as the Apollo 11 Tranquility Base or the Soviet Luna 2 impact site—is a microcosm of the broader governance challenge. These sites are currently protected only by the OST’s general provisions and the Artemis Accords’ non-binding guidelines. There is no international convention specifically safeguarding cultural heritage in space, analogous to UNESCO’s World Heritage Convention on Earth. This leaves sites vulnerable to damage from future landers, rovers, or even commercial tourism. A coalition of archaeologists and space lawyers has advocated for a multilateral agreement, but progress has been slow. For nations with rich archaeological traditions, such as Egypt or Peru, the absence of a space heritage framework is a missed opportunity to extend their expertise into the celestial domain.
Environmental Ethics and the Celestial Wilderness
Beyond the legal instruments, a deeper question looms: do celestial bodies possess intrinsic value that warrants protection, even in the absence of immediate scientific or economic utility? The OST and Moon Agreement are anthropocentric; they protect celestial bodies for the benefit of humankind and scientific investigation. But some environmental philosophers and indigenous legal scholars argue for a more ecocentric approach, recognizing the inherent worth of extraterrestrial landscapes. This perspective resonates in regions like the Pacific Islands, where traditional legal systems often grant legal personality to natural features such as rivers and mountains.
In 2017, New Zealand granted legal personhood to the Whanganui River, recognizing it as an indivisible and living whole. Could a similar concept apply to the Valles Marineris on Mars or the ice geysers of Enceladus? While such ideas remain on the fringes of international space law, they challenge the dominant utilitarian paradigm. For planetary protection to be truly inclusive, the voices of indigenous communities and non-Western legal traditions must be part of the conversation—not as an afterthought, but as co-creators of a governance framework that reflects the diversity of human relationships with nature.
Practical Challenges: Enforcement and Compliance
Treaties are only as strong as their enforcement mechanisms, and here the international space law regime reveals its most significant weakness. The OST contains no specific enforcement provisions. Disputes are to be resolved through consultation, and there is no compulsory jurisdiction for the International Court of Justice. The Moon Agreement’s proposed international regime was never established. COSPAR’s planetary protection guidelines are scientifically sound but lack legal teeth; a state that deliberately contaminates a celestial body faces reputational damage but no formal sanctions.
This enforcement gap disproportionately affects nations without their own space capabilities. If a commercial entity from a launching state contaminates a site of astrobiological interest on Mars, what recourse does Kenya or Indonesia have? The OST’s state responsibility clause holds the launching state liable, but only if the affected state can prove damage—a near-impossible evidentiary burden for contamination that may not manifest for decades. Some legal scholars from the Global South have proposed a planetary protection trust or ombudsman, modeled on domestic environmental agencies, to monitor and enforce compliance. Such a body could be funded by a levy on space resource extraction, ensuring that those who profit from celestial bodies also contribute to their protection.
The Role of Non-State Actors
The rise of private space companies adds another layer of complexity. The OST requires states to authorize and continuously supervise the activities of non-governmental entities. However, the capacity for supervision varies widely. A small island state that hosts a commercial launch site may lack the technical expertise to assess whether a private lunar lander meets planetary protection standards. This creates a risk of “flags of convenience” in space, where companies incorporate in states with lax oversight. A coalition of developing nations has raised this concern in COPUOS, calling for capacity-building and the development of international standards for national authorization legislation. The UN Office for Outer Space Affairs (UNOOSA) has responded with workshops and model laws, but the resource gap remains stark.
FAQ: Protecting Celestial Bodies Under International Law
What does the Outer Space Treaty actually protect on the Moon?
The Outer Space Treaty protects the Moon from national appropriation—no country can claim ownership of lunar territory. It also requires states to avoid harmful contamination of the Moon and to conduct activities with due regard for other states’ interests. However, it does not explicitly protect specific sites or features, nor does it ban resource extraction, which is a subject of ongoing legal debate.
Why haven’t more countries ratified the Moon Agreement?
The Moon Agreement’s “common heritage of mankind” principle implies that benefits from lunar resources must be shared internationally, which major spacefaring nations viewed as a potential obstacle to commercial exploitation. Additionally, the Agreement was opened for signature during a period of waning interest in lunar exploration. Many developing nations, which could benefit from its provisions, lacked the diplomatic weight to push for its adoption and instead focused on more immediate terrestrial concerns.
How does planetary protection affect countries without space programs?
Planetary protection affects all nations because celestial bodies are considered a global commons. Contamination of a site on Mars could destroy scientific information about the origins of life, which is a loss to all humanity. As space resource extraction becomes feasible, the legal frameworks that govern protection will determine who benefits from those resources. Countries without space programs have a stake in ensuring that these frameworks are equitable and do not simply favor the most technologically advanced states.
Are there any binding rules for private companies that want to mine asteroids?
Currently, no binding international treaty specifically regulates asteroid mining. The Outer Space Treaty prohibits national appropriation but does not explicitly address private ownership of extracted resources. Some nations, like the United States and Luxembourg, have passed domestic laws granting property rights to resources extracted by their companies. This has created legal uncertainty and calls for a multilateral framework, though none has been agreed upon.
Toward an Inclusive Governance Model
The protection of celestial bodies is not a technical problem awaiting a technical solution. It is a governance challenge that requires the active participation of all nations, particularly those whose perspectives have been marginalized in the history of space law. The current treaty regime, while foundational, reflects the geopolitical realities of the Cold War. As we enter an era of lunar bases, asteroid mining, and Mars sample returns, the legal architecture must evolve to address new actors, new technologies, and new ethical questions.
For Africa, Latin America, Southeast Asia, and small island states, the path forward lies not in rejecting the existing framework but in demanding its reform. This means active engagement in COPUOS, the development of regional space policy hubs, and the cultivation of legal and scientific expertise. It also means building coalitions that cross traditional North-South divides, uniting around shared interests in environmental protection, equitable benefit-sharing, and the prevention of a new colonial scramble in space. The treaties that protect celestial bodies are our collective inheritance. Their future will be written by those who show up to the drafting table.
This article is part of an ongoing series on space law and planetary governance. Future installments will examine national space legislation in Africa and the role of environmental impact assessments for lunar missions.