A discarded Falcon 9 stage will hit the Moon on August 5, giving astronomers a rare chance to watch humanity’s space junk carve a fresh new lunar crater.
Space exploration has traditionally involved looking upward with wonder, pushing the boundaries of human knowledge and occasionally leaving several tons of machinery behind like someone abandoning a sofa beside the highway.
One of those leftovers is now expected to crash into the Moon.
At approximately 2:35AM EST Wednesday, August 5, a spent upper stage from a SpaceX Falcon 9 rocket is predicted to strike the lunar surface near Einstein Crater. The roughly four-ton stage will be traveling at about 5,400 mph, or 2.43 kilometers per second, when the Moon rather abruptly removes it from circulation.
This is not a controlled landing, a secret lunar base delivery or the opening scene of a particularly thrifty science-fiction movie. It is an accidental collision involving a dead rocket stage that has spent more than a year wandering through the Earth-Moon system.
The Rocket Already Completed Its Important Job
The doomed upper stage launched on January 15, 2025, carrying two commercial lunar landers: Firefly Aerospace’s Blue Ghost Mission 1 and ispace’s Resilience lander.
Blue Ghost went on to complete a successful commercial Moon landing in March 2025. The Falcon 9 upper stage, having delivered the payloads onto their lunar trajectories, remained in a distant orbit without enough fuel to steer itself into a safer disposal path. Gravitational nudges eventually transformed it from expensive aerospace hardware into a four-ton lunar projectile.
Orbital calculations now place the expected impact near the Moon’s western limb as viewed from Earth, close to the large Einstein Crater. Tracker Bill Gray lists the predicted coordinates at approximately 19.46 degrees north and 93.29 degrees west, although small uncertainties remain because sunlight and other subtle forces can gradually alter the path of an empty rocket stage.
In other words, astronomers know where it should hit. They just are not pretending that celestial mechanics signed a legally binding appointment card.
This Could Produce More Than a Tiny Flash
Researchers expect the collision to create a new crater perhaps 20 to 30 meters wide, although the final size will depend on the exact impact angle, surface material and remaining mass of the rocket.
More dramatically, computer simulations suggest the impact could throw a curtain of lunar dust approximately 15 to 20 kilometers above the surface. A narrower central spike of ejecta might rise 75 to 100 kilometers before lunar gravity begins cleaning up the scene. The spreading debris field could extend roughly 183 kilometers across the surface.
Those are predictions, not confirmed outcomes. The actual plume could be smaller, fainter or shaped differently depending on the local terrain and the stage’s final orientation. That uncertainty is precisely why scientists are interested.
Researchers have studied deliberate lunar impacts before, including NASA’s LCROSS mission in 2009. Accidental spacecraft impacts have also left craters that were later photographed by the Lunar Reconnaissance Orbiter. What makes this event unusual is that astronomers know the incoming object, its approximate mass, speed, trajectory and impact time well enough to coordinate observations in advance.
It is an uncontrolled crash being treated like a scheduled scientific experiment, which is either admirable resourcefulness or the most sophisticated version of “we meant to do that” ever attempted.
Can You Watch It From Earth?
Possibly, but this is not expected to resemble a Hollywood explosion painted across half the Moon.
The impact site will be on sunlit terrain near the lunar edge, making the resulting flash and dust plume difficult to distinguish against the Moon’s bright surface. Researchers believe the ejecta may remain observable for minutes through capable telescopes, but visibility will depend heavily on weather, telescope size, atmospheric stability and whether the plume behaves as simulations predict.
The impact is not expected to be visible to the unaided eye. Anyone strolling outside at 2:35 in the morning and squinting dramatically at the Moon will mostly experience mosquitoes and regret.
Professional observatories and experienced amateur astronomers are being encouraged to record the event. Parts of the eastern and southeastern United States may have favorable geometry, although the Moon will be relatively low in the sky from many locations. Observers will need to locate the correct lunar limb before the predicted impact and record continuously, since the initial flash may be brief.
The smartest viewing option for most people will be to watch for observatory livestreams or recordings posted after the collision rather than hurriedly purchasing a telescope and discovering astronomy involves considerably more patience than movies suggested.
The Moon Is Becoming a Busier Neighborhood
The impact is scientifically useful, but it also carries an uncomfortable message about the growing amount of hardware traveling beyond Earth orbit.
More governments and private companies are sending spacecraft toward the Moon, including orbiters, landers, communications platforms and eventual crewed missions. Every launch creates decisions about what happens to spent rocket stages and other discarded components once their primary job is complete.
A rocket striking an empty stretch of lunar terrain does not create an immediate crisis. No astronauts, operational landers or populated lunar gift shops are in danger. Still, researchers argue that understanding impact debris will become more important as equipment and people occupy more locations around the Moon. A future collision near a surface base or spacecraft could throw high-speed particles across a surprisingly large area.
Scientists also hope the event will improve methods for locating lunar impacts. Accurately connecting a known collision with its flash, ejecta pattern and eventual crater could help future seismic experiments use impacts to study the Moon’s interior.
Humanity’s Strangest Scheduled Collision
Assuming the trajectory holds, the Falcon 9 stage will disappear into the Moon in seconds. The flash may be faint. The dust plume may prove difficult to capture. The final crater may not be photographed clearly until a lunar orbiter passes over the site later.
But the event remains remarkable.
A machine launched from Florida, after carrying two robotic explorers toward the Moon, has spent more than a year following an increasingly chaotic path through space. Now astronomers around the world know almost exactly when that journey will end, and they will point their instruments toward a specific patch of lunar ground to watch it happen.
It is science, spectacle and garbage disposal combined into one deeply human event.
Sources
- Observational planning for the August 5 Falcon 9 lunar impact
Benjamin Fernando and collaborators, arXiv
https://arxiv.org/abs/2607.14625 - Predicted ejecta dynamics and observability of the impact
William Jo and collaborators, arXiv
https://arxiv.org/abs/2607.23904 - Upper stage impacting the Moon on August 5, 2026
Project Pluto, Bill Gray
https://www.projectpluto.com/25010d.htm - A discarded SpaceX rocket is on a high-speed collision course with the Moon
Associated Press
https://apnews.com/article/512c4dd708b4cda1160d30b764f9fdb5 - A SpaceX rocket will crash into the Moon this week
Space.com
https://www.space.com/astronomy/moon/a-spacex-rocket-will-crash-into-the-moon-next-week-and-scientists-arent-sure-what-to-expect
