An 8,800-pound Falcon 9 rocket stage struck the moon last Wednesday (Aug. 5), creating a massive dust plume visible from Earth and highlighting growing concerns about lunar debris management, according to space experts. The impact adds to roughly 3,000 manmade objects already scattered across the lunar surface, spanning from historical Apollo descent modules to defunct robotic rovers.
The Growing Accumulation of Lunar Debris
Since the beginning of the space age, approximately 200 tons of material from Earth have been deliberately left on or crashed into the moon. Notable hardware left behind features the descent craft from all half-dozen Apollo missions, robotic rovers sent by the Soviet Union in the seventies, and the Yutu 1 and 2 machines deployed by China during the 2010s. Alongside these historic sites, however, rests an accumulation of unplanned hardware.
Astronomer and space historian Jonathan McDowell noted that many rocket stages and orbital objects left between Earth and the moon since the 1960s have similarly ended up on the lunar dirt. Four years prior to the recent Falcon 9 impact near Einstein Crater, a part of a Chinese Long March 3C rocket slammed into the moon’s far side. Experts warn that such incidents could become increasingly common in the coming years, as exploration of the moon intensifies.
Did you know? Spanning around 14.7 million square miles (38 million square kilometers), the lunar surface area approaches the scale of Asia—the largest continent on Earth, which measures 17 million square miles (44 million square km). This issue is compounded because the moon’s gravity is roughly 17% that of Earth, meaning debris kicked up by an impact travels extensively and requires a lengthy duration to settle.
Regulatory Gaps in Outer Space Governance
The 1967 United Nations Outer Space Treaty regulates human actions on the lunar body, as explained to Space.com by Marieta Valdivia Lefort, who serves as a policy officer at the Royal Astronomical Society located in the U.K. Article IX of that treaty binds countries to “conduct the exploration of outer space in a way that avoids harmful contamination,” she said. Yet, what exactly constitutes such contamination is unclear, she added.
“There are international legal frameworks that apply to activities on the moon and include obligations concerning harmful contamination, but there is no dedicated international ‘waste law’ or comprehensive ‘rubbish-management’ system for it,” Lefort wrote in an email. “The Outer Space Treaty does not define when contamination becomes ‘harmful.’ It does not set numerical waste limits, create approved disposal sites or require every object on the moon to be removed.”
According to McDowell, the space industry has entered a transitional era defined by commercial missions and multi-nation landings. “Governance has not kept up with this,” McDowell told Space.com. “We don’t have an international set of agreements on how to operate near the moon, how to coordinate activities near the moon, and we’re really going to need it because, not only is the amount of activity at the moon increasing, but the number of different players is greatly increasing, too.”
Scientific Risks of Uncontrolled Impacts
Uncontrolled rocket strikes alter the lunar physical and chemical environment, which can potentially erasing yet unexplored scientific material. While natural meteoroids naturally strike the moon, and those impacts form part of the geological record that scientists are trying to understand, repeated disturbances could damage or obscuring valuable scientific evidence, according to Lefort.
Furthermore, future permanent human bases and scientific experiments on the moon will be vulnerable to heavy rocket stages creating massive dust plumes. McDowell explained that these continental-level events could easily contaminate sensitive instruments or disturb gravitational wave detectors.
Speaking to Space.com, space law specialist Gregory Radisic from Australia’s Bond University noted that the timing of the recent Falcon 9 crash was fortunate, providing an opportunity to spark discussions regarding accountability in outer space before lunar traffic becomes overwhelming. “It’s not by good planning that this didn’t hit something important,” Radisic told Space.com. “It’s by pure luck that we’re only having a conversation about theoretical problems down the line and that this did not destroy a million-dollar experiment or an important site of scientific study.” Radisic added that the commercial space industry may only alter its disposal practices once human lives are lost or expensive infrastructure suffers, resulting in tangible fines and consequences.
Orbital Mechanics and Future Disposal Norms
The Falcon 9 booster that struck the lunar surface had been orbiting Earth at a high altitude since January 2025, having previously delivered Firefly Aerospace’s Blue Ghost and ispace’s Resilience landers toward the moon. Because the stage was left relatively close to the moon, it got repeatedly influenced by lunar gravity, eventually spiralling into its surface, according to McDowell.
McDowell pointed out that following the January 2025 launch, SpaceX began directing its lunar mission rockets further outward into heliocentric orbits around the sun. “I hope that we’re going to see a new norm evolve, and that what we have seen now is not how you dispose of your rocket stages in the future,” he said.
Pro tip: Space mission planners can mitigate orbital uncertainty by directing spent upper stages into heliocentric orbits rather than leaving them in high-altitude Earth-moon transition zones where gravitational tugs are difficult to forecast.
Frequently Asked Questions
What treaty governs human activity on the moon?
Human activities on the moon are governed by the 1967 United Nations Outer Space Treaty, which obligates countries to avoid harmful contamination during space exploration.
Does international law ban leaving trash on the moon?
No. According to policy experts, there is no dedicated international waste law, numerical waste limit, or comprehensive rubbish-management system specifically for the lunar surface under current treaties.
How do spent rocket stages end up crashing into the moon?
Rocket stages left in high-altitude transition orbits between Earth and the moon are subjected to complex gravitational forces from both bodies, which can destabilize their trajectories and cause them to impact the lunar surface unpredictably.
Want to stay updated on space exploration policy and lunar missions? Subscribe to our newsletter or explore our latest archives for more in-depth reporting.