A spent SpaceX Falcon 9 upper stage that has been tumbling uncontrolled through cislunar space since January 2025 appears to be on a collision course with the moon, with a possible impact window opening in August, according to independent orbital analyst Bill Gray of Project Pluto.
The rocket body launched Firefly Aerospace’s Blue Ghost Mission 1 on Jan. 15, 2025, as part of NASA’s Commercial Lunar Payload Services (CLPS) program. After injecting the lander and its suite of scientific instruments onto a lunar transfer trajectory, the second stage had no remaining fuel to steer itself into a safe disposal orbit. It has been drifting ever since, and gravitational tugs from the Earth, moon, and sun have gradually bent its path toward an unplanned lunar strike.
If confirmed, it would not be the first time a rocket stage has slammed into the moon. But the episode puts a sharp point on a question the space industry has been slow to answer: as commercial lunar missions ramp up, who is responsible for the hardware they leave behind?
What the tracking data shows
Gray, whose trajectory calculations were central to identifying a previous uncontrolled lunar impact in March 2022, has been modeling the Falcon 9 stage’s orbit using publicly available tracking observations. His analysis, updated through early 2026, shows the object’s path threading through a chaotic gravitational environment where small perturbations can shift a predicted impact point by hundreds of kilometers or push the timeline by weeks.
The August window is a best-current-estimate, not a certainty. Cislunar trajectories are notoriously difficult to predict because the Earth, moon, and sun create a three-body problem where tiny changes in initial conditions cascade into large differences over time. New observations could tighten the forecast or push the probability down. As of May 2026, neither SpaceX, NASA, nor Firefly Aerospace has publicly confirmed the trajectory projections or issued a statement on the stage’s expected fate. None of the three organizations responded to requests for comment.
NASA’s CLPS blog confirmed the successful launch and payload separation in January 2025. The Blue Ghost lander went on to reach the lunar surface as planned. What happened to the upper stage afterward received far less attention.
This has happened before
In March 2022, a rocket body widely attributed to a Chinese Chang’e 5-T1 mission booster struck the far side of the moon. NASA’s Lunar Reconnaissance Orbiter (LRO) later photographed the resulting double crater, confirming the impact. That event drew public attention largely because of the detective work required to identify the object. Gray was among the analysts who tracked it and flagged the collision in advance.
A more deliberate precedent came in 2009, when NASA’s LCROSS mission intentionally drove a Centaur upper stage into a permanently shadowed crater near the moon’s south pole. A trailing spacecraft flew through the resulting debris plume and confirmed the presence of water ice in the ejecta. That experiment worked because every variable was controlled: the impactor’s mass and velocity were known, the target crater was chosen with care, and instruments were positioned to capture the data in real time.
The Falcon 9 stage headed for the moon carries no instruments and has no targeting. Any scientific value from an uncontrolled strike would depend on whether ground-based or orbital telescopes happen to catch a flash or dust plume, and on how well the impact parameters can be reconstructed after the fact. That is a far harder problem when the timing and location remain approximate.
Why disposal is so difficult for lunar missions
Falcon 9 second stages used for low Earth orbit missions routinely perform a deorbit burn, reentering over the ocean in a controlled manner. Lunar missions are a different calculation. The energy required to reach a lunar transfer orbit leaves little or no propellant margin for a controlled disposal maneuver afterward. Pushing the stage into a stable heliocentric (sun-orbiting) path or guiding it back into Earth’s atmosphere would require fuel that simply is not budgeted into the mission design.
This is not unique to SpaceX. Nearly every launch provider sending payloads toward the moon faces the same constraint. The spent stage ends up in an elongated, unstable orbit that wanders under the competing gravitational pulls of the Earth and moon. Over weeks or months, those forces can funnel the object toward a lunar collision, send it back into Earth’s neighborhood, or fling it into a long-lived orbit around the sun. The outcome depends on geometry and timing that are difficult to predict at the moment of stage separation.
A policy gap between Earth orbit and cislunar space
In low Earth orbit, debris mitigation has a decades-long track record of evolving guidelines. The FCC now requires U.S.-licensed satellites to deorbit within five years of mission end. Launch providers plan and execute controlled reentries for spent stages. Compliance is imperfect, but a shared framework exists.
For cislunar space, nothing comparable is in place. The 1967 Outer Space Treaty addresses liability and peaceful use but says little about disposal rules for upper stages bound for the moon. The Artemis Accords, signed by more than 40 nations, include broad principles on mitigating orbital debris and avoiding harmful contamination of celestial bodies, but they do not prescribe specific disposal standards for rocket hardware after lunar injection burns.
Commercial contracts under programs like CLPS may specify performance and safety requirements for the payload delivery phase, but they often leave the post-mission fate of propulsion elements unaddressed. Each lunar-bound launch effectively writes its own informal standard, shaped by propellant margins, mission architecture, and the risk tolerance of the organizations involved.
The potential for uncontrolled impacts also raises concerns for future lunar science. Permanently shadowed craters near the poles may harbor pristine water ice that researchers want to study and, eventually, extract. A single Falcon 9 stage is unlikely to cause lasting damage, but a pattern of repeated, uncoordinated strikes could contaminate the very sites scientists are trying to preserve.
What happens between now and August
The next few months will be driven by data, not policy. Gray and other trackers will continue refining their orbital solutions as new observations come in. If the collision probability holds and the predicted impact zone narrows, observatories may position themselves to watch for a flash or ejecta cloud, hoping to extract at least some scientific value from an unplanned event.
Any public statement from SpaceX, NASA, or Firefly Aerospace about the mission’s disposal planning would help fill the gap in the record. What options were considered? What constraints ruled them out? Was the current trajectory treated as an accepted risk from the start? Those answers matter not just for this one rocket body but for the dozens of upper stages that will follow as commercial lunar traffic increases under CLPS and other programs.
Even if the Falcon 9 stage ultimately misses the moon and drifts into a different orbit, the episode has already made one thing clear: as humanity sends more hardware toward the moon, the question of what happens to the pieces we leave behind is no longer hypothetical. It is arriving on a schedule that the policy world has not yet matched.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
