What if Someone Tries to Claim a Planet?

Outer space law already blocks countries from claiming celestial bodies, but it leaves a loophole for private individuals—raising the question of what would happen if someone tried to “own” a planet like Mars. The Outer Space Treaty, agreed in 1967 by the United States, the UK, and the Soviet Union and now backed by more than a hundred nations, bans placing nuclear weapons in space and explicitly forbids nations from claiming space resources such as the moon or a planet. So far, no government has attempted to seize a celestial body, and the treaty’s enforcement has largely kept the peace.

The scenario changes when the claimant isn’t a state. The treaty does require non-government entities to operate with authorization and remain responsible to their parent nations, but it does not clearly spell out whether an individual can make a legal claim to a planet or moon. That ambiguity becomes the basis for a thought experiment: if a figure like North Korea’s Kim Jong-un somehow landed on the moon, planted a flag, and tried to defend the “prize,” the likely outcome would be diplomatic backlash, stern responses from treaty partners, and intensified sanctions on Earth. If the moon claim were paired with a nuclear delivery capability, global retaliation would likely escalate dramatically.

A private claim, however, would create a different kind of problem. With private spaceflight advancing—citing SpaceX’s Falcon Heavy as a recent milestone—the transcript turns to the idea that Elon Musk could attempt a “supervillain” takeover of Mars. It frames legal ownership using the doctrine of first possession, a “finders keepers” style principle: to claim something, a claimant must show intention and control, and possession is considered effective once both criteria are met. Under that logic, planting a flag could demonstrate intent, but control would require infrastructure—such as building roads and outposts across large portions of the planet—to justify territorial claims.

Even if such a claim were made, it would likely be challenged. On Earth, American authorities would probably demand the claim be withdrawn, and other treaty members could treat it as a threat and take further action. The transcript argues that full ownership of Mars would be nearly impossible without an all-at-once effort: sending enough people, materials, and supplies to establish a self-sufficient colony and effectively cut off Earth’s ability to intervene. If a colony gained a 10–20 year head start before major agencies like NASA or the ESA could arrive, the political and practical leverage would shift—especially if the settlers were hostile to outsiders.

The closing takeaway is less about any specific person and more about governance. As private groups and governments expand into space, rules for ownership and jurisdiction will likely need to evolve. The unresolved question is whether Earth law will apply to space colonies uniformly, or whether regulations will differ by celestial body—determining whether space becomes a regulated frontier or a new “Wild West.”