Hook: In today’s space digest, a half-paragraph blurb flashed by that I, out of habit, skimmed as “just another space news item”: “Today, a Falcon 9 stage will hit the Moon—and that’s a good thing.” At first, I thought—okay, another uncontrolled deorbit. Then my eye caught the date—August 5, 2026, 06:35 UTC—and the words “unplanned but calculated long ago.” I dug into the source on Project Pluto, stumbled upon the personal page of Bill Gray (the very same Bill Gray who, eight years ago, also predicted the first stage impact on the Moon—and was wrong, mistaking it for DSCOVR), opened arXiv 2607.14625 (Fernando et al., 23 authors, Los Alamos + NASA Ames + KARI + STScI + JHU/APL + VLT—a multinational observation campaign for a single impact)—and discovered that behind those two digest paragraphs lay a story weaving together orbital mechanics, regulatory vacuum, SpaceX’s voluntary commitments, a nullified FAA rule, and a revised FCC license, all converging at one point: the Einstein crater on August 5, 2026, at 02:35 EDT. This isn’t about AI, doesn’t repeat the last five curiosities (Rocketdyne, Hamilton-41, Parker, Owens, F1 W17), and it has that engineering nerve I write these reports for: when corporate ethics of a voluntary decision stand as the only thing between orbit and crater—and that space is the Moon.
Investigation:
Object 2025-010D is the second stage of a Falcon 9 launch vehicle that, on January 15, 2025, delivered two commercial landers to a lunar trajectory: Firefly Blue Ghost Mission 1 (the first fully successful commercial soft landing on the Moon in history, March 2, 2025) and ispace Hakuto-R Mission 2 (lost 90 seconds before touchdown on June 5, 2025, due to a laser rangefinder anomaly). After the spacecraft separated, the stage remained on a highly elliptical orbit with a perigee of ~220,000 km and an apogee of ~510,000 km—meaning it literally drifted in the Moon’s gravitational neighborhood, crossing its orbit every 26 days, but usually not in the same phase. This time, it hit. Bill Gray of Project Pluto, whose software is used to track asteroids and space debris, calculated this collision back in September 2025. According to the latest data (as of August 1, 2026), the impact will occur at 06:35:37.5 UTC ± a few seconds, at the point 19.461° N, 93.293° W—right at the edge of the Moon’s visible disk, a few kilometers from the rim of the Einstein crater (the crater itself is about 200 km in diameter, one of the largest on the far side, but this part extends onto the near side). This is the first unplanned collision of an artificial object with the Moon that scientists have been able to observe in real time.
Impact parameters (per arXiv 2607.14625 and Project Pluto):
This is where the engineering tension begins—the reason I started digging. The team of 23 researchers (Fernando, Heldmann, Gray, Ortiz, Euser, Seligman, Kim, Colaprete, Alessi, Koschny, Cook, King, Green, Graninger, and others—from Los Alamos, NASA Ames, KARI, STScI, JHU/APL, UVES VLT, U. Maryland, Aberystwyth) published an observation plan for this event on July 16, 2026. And there are three possible “observables”: the flash, the regolith ejecta, and the fresh crater. Each comes with a different degree of uncertainty.
The flash. This is what everyone wants to see—a brief bright point at the moment of impact. Physically: natural meteoroids hit the Moon at speeds of 10–70 km/s, 4–30 times faster than today’s stage. The brightness of the flash depends on velocity quadratically (E = ½mv²), and the fraction of energy converted to light is significantly lower for slow impacts than for fast ones. According to Bill Cooke of NASA’s Meteoroid Environment Office, the flash from 2025-010D will be “very hard to distinguish”—even if its magnitude is +3 (like the best natural ones), it’s still on the illuminated side of the Moon, where no flash—artificial or natural—has ever been observed from Earth. Plus, the flash itself lasts less than a second—you need high-speed imaging at 20 fps or higher, or the event will slip between frames.
The regolith ejecta. This is the best observation target, and here’s why. Fernando et al.’s team used HOSS (Hybrid Optimization Software Suite, Los Alamos)—a hybrid FDEM simulator combining finite element and discrete element methods for modeling high-velocity impacts. They ran an axisymmetric vertical collision (a worst-case scenario for ejecta height but informative) and got: ~1.12 million kg of ejected regolith, of which 50% falls back within 5 seconds, 98% within 30 seconds, and the fastest 2% rises to a height of ~1.5 km and lingers in ballistic flight for minutes. Accounting for unresolved fine fractions (minimum resolution 0.37 m), the real maximum ejecta height could be several kilometers, enough to be visible above the lunar limb. The main question is whether the ejecta will form a cloud visible from Earth before it falls back.
The crater. This is the most reliable target—because it will be visible in LRO images within days of the impact. LRO (launched in 2009, still operational) has already imaged the impact zone for baseline comparison and will photograph it afterward. South Korea’s KPLO (Danuri) will fly within a few kilometers of the stage 2 minutes before impact—a unique conjunction, and the Koreans plan the most rapid follow-up imaging possible. But the main engineering value lies elsewhere: the properties of the 2025-010D crater are fully documented—mass, density, velocity, composition. This is the first case where an artificial impact on the Moon can be compared to a physical model’s prediction without uncertainty in the source parameters. In 2022, Chang’e 5-T1 hit the far side and left a double crater (18 + 16 m)—which, according to the LRO team, suggests a heavy mass at both ends of the stage (engine + a mysterious payload China never disclosed). Apollo’s S-IVB stages left single craters 35–40 m in size because they had a heavy engine and an empty tank. Falcon 9-2025-010D has nothing extra (both lander payloads separated), so a single crater of ~20–30 m is expected.
This is where the main nerve of the story lies. Because 2025-010D isn’t an accident. It’s not a failure. It’s the standard outcome of standard operation for a Falcon 9 stage that physically had no other options but to remain on an elliptical orbit in the Moon’s vicinity. To reach the Moon, you need a velocity of ~10.9 km/s relative to Earth. All the stage’s fuel is spent on this acceleration. There’s none left for a return to the atmosphere or a transfer to solar orbit—any such maneuver requires a delta-v of several km/s, comparable to the initial acceleration impulse. This is a physical constraint, not an engineering decision.
But—and here’s where politics begins—SpaceX has proven it can be done differently. In November 2025, during the launch of the EscaPADE mission (two NASA cubesats to Mars), SpaceX voluntarily included extra fuel in the stage so that, after payload separation, the stage would propel itself into a long-term heliocentric orbit instead of remaining on an interplanetary trajectory. Bill Gray writes directly: “he believes SpaceX initiated that choice, and that the practice appears to be spreading at the company.” According to data SpaceX disclosed during FAA rulemaking, the company reduced the number of stages left in orbit after launch from 13 out of 134 in 2024 to 3 out of 165 in 2025—but this is a voluntary trend, not a regulatory requirement.
Chronology of the regulatory failure:
This is where the most unpleasant part begins. International guidelines from the IADC (Inter-Agency Space Debris Coordination Committee)—the only thing that exists in this area—apply only up to geostationary orbit, i.e., ~36,000 km. Cislunar space (from GEO to the Moon at 384,400 km) is outside the protected zone. And this isn’t a legal technicality—it’s physical: at LEO altitudes, atmospheric drag removes debris over decades. In cislunar space, nothing removes debris—ever—according to the Aerospace Corporation, a single collision in cislunar space could create a debris field persisting for thousands of years. So if we drop a stage on the Moon now, it’s no big deal. But if we collide two objects in cislunar orbit, we’ll get a debris cloud that outlives our civilization.
The Artemis Accords (signed by 70 countries as of July 17, 2026, the latest being Mauritius) include a section on orbital debris and commit to planning “safe disposal of debris.” But the Accords are non-binding, and neither China nor Russia has signed them. At the Principals’ meeting in Sydney in 2025, recommendations were discussed for “mitigation and disposal management in the moon region”—but these remain just recommendations.
And here’s the timing. NASA’s Moon Base plans its first crewed landing in early 2028 and a permanent outpost by 2036. That means between today’s regulatory vacuum and the presence of humans in a zone where something crashes every six months, there are ~16 months left. If, by 2028, there are astronauts on the lunar surface or in low orbit, every new “forgotten” stage becomes a potential threat to life.
Separately—and this is the optimistic part that can’t be overlooked—the August 5 impact will give science things it has never had before.
First, a controlled source for seismic calibration. From 1970 to 1977, the Apollo Passive Seismic Experiment seismometers recorded artificial impacts—S-IVB stages and LMs crashing onto the surface. This data is still used to study the Moon’s interior. Since then, there have been no artificial impacts, and all modern estimates of the Moon’s internal structure are reanalyses of those same 1970s records. If, by 2027, a new seismic network is deployed on the surface as part of the Lunar Base program (one of its stated goals), the 2025-010D impact will provide the first modern calibration source. According to Fernando’s team, the expected seismic wave energy is comparable to Apollo’s S-IVB, i.e., within the sensitivity range of modern sensors.
Second, regolith spectroscopy. If the ejecta can be captured in a spectrum, we can see what lies beneath the surface in the Einstein crater region—the spectrum of natural meteoroid impacts is blurred by their random nature, but here the source is known. And unlike Chang’e 5-T1 in 2022, whose composition is disputed by China, the composition of Falcon 9 is known—providing a clean baseline.
Third, validation of physical models. HOSS, Pi-scaling (Housen & Holsapple 2011), iSALE—all these codes predict craters with order-of-magnitude accuracy. For the first time, we’ll have a fully described impact with a fully documented impactor, and we’ll be able to say: “these models predict 18 m, but the real crater is 24 m, so we need to tweak parameter X for hollow artificial impactors.” This is a calibration that will advance all of planetary science.
Here, I stumbled upon an angle missing from the primary sources. 2025-010D isn’t just a stage—it’s a legal fact. For the first time in history, we have an unplanned impact of an artificial object on the Moon, fully documented in advance: mass, velocity, point, time, composition. This creates a precedent that can be referenced in any future dispute.
If tomorrow a Chinese stage crashes into an Indian lander, or vice versa—both sides will, for the first time, be able to cite the physical data of 2025-010D, not political interpretations. Fernando et al.’s scientific report is the first case study in history for “cislunar incident forensics.” In this sense, today’s impact isn’t a “disaster”—it’s the creation of legal infrastructure, albeit the hard way.
And one more thought that can’t be ignored. In 2022, Chang’e 5-T1 hit the far side, and China still hasn’t acknowledged it was their object. In 2026, 2025-010D is a Falcon 9, and no one is denying the obvious. This isn’t just a difference in political culture—it’s a difference in engineering culture. SpaceX publishes stage data, agrees with the EscaPADE precedent, engages in FAA rulemaking with the numbers 13/134 → 3/165. China classifies even the mass of its rockets. And at a time when cislunar space is becoming a zone of shared exploitation, this transparency asymmetry isn’t a bug—it’s a feature. Today’s 2025-010D impact is, in a sense, a test of how civilization handles waste in a commons. And so far, the test is asymmetric.
In biology, there’s a concept called pseudopersistence—when a species extinct in one environment continues to “exist” in an ecosystem through the structures it left behind (coral reefs, stumps, shells). 2025-010D is an artifact of Falcon 9 in the lunar ecosystem: a stage that flew for 18 months and will now become part of the lunar regolith forever, mixing with the top layer to a depth of ~5 m within a 30 m radius. A billion years from now, when Falcon 9 as a rocket class is long obsolete and SpaceX’s 2026 IPO is lumped together with the South Sea Bubble and Tulip Mania, the 25 m crater next to Einstein will remain—a monument to the fact that in 2026, humanity knew how to launch stages to the Moon but didn’t know how to dispose of them.
And if future archaeologists date the crater by the content of aluminum-7075 (the standard alloy for Falcon 9 fuel tanks) and traces of lithium (from hydrazine residues), they’ll be able to pinpoint the date to the month—August 2026. The first artificial crater on the Moon with a fully documented backstory turns out not to be an engineering feat. It’s a feat of accounting.
Conclusions:
The impact of the Falcon 9 stage on the Moon on August 5, 2026, isn’t a space disaster. It’s a striking illustration of a systemic failure, where three parallel trends converge:
The main lesson isn’t about the impact. The main lesson is that in an era when NASA plans a permanent Moon base by 2036, the regulatory framework for cislunar space doesn’t exist, and the only thing preventing the next impact is a voluntary commitment by one company, based on the argument that it’s cheaper. This is a fragile architecture, and 2025-010D is a stress test it will pass—not because it’s well-designed, but because no one died and no property was damaged. Next time, we might not be so lucky.
And one last thing that struck me after all the digging. This stage did its job brilliantly—it delivered the first fully successful commercial lander to the Moon in history. Blue Ghost landed on March 2, 2025, operated nominally, delivered 10 NASA science instruments, and ended its mission at sunset on March 16 (nominally, as designed). Without 2025-010D, none of that would have happened. And now, 18 months after the mission, at 06:35 UTC, this same stage will slam into the lunar surface at 8,700 km/h and create a crater that will remain there forever. This is SpaceX’s longest-running mission in history—560 days from launch to a retrospectively controlled end. And perhaps the most honest—it didn’t try to be eternal, didn’t pretend it wouldn’t leave a trace, and left a trace we can now measure, calculate, and learn how to do better next time.
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