A Dead SpaceX Rocket Is About to Strike the Moon at 5,400 Miles Per Hour

A Year of Drifting, Then Impact

A spent SpaceX Falcon 9 upper stage will crash into the Moon on Wednesday, August 5, hitting near Einstein Crater at 5,400 mph. It's not a mission, and nobody planned it. It's a leftover chunk of rocket that has been quietly circling Earth for more than a year, and its looping orbit is finally about to cross paths with the Moon.

Back in January 2025, this stage did its job: it launched Firefly Aerospace's Blue Ghost Mission toward the Moon. Then it became orphaned — stranded in a chaotic elliptical orbit around Earth, lacking the fuel to deorbit and the velocity to escape. Gravitational pulls from Earth, the Moon, and the Sun — plus the gentle shove of solar radiation pressure — spent the next eighteen months walking it into a lunar collision course, like the world's slowest game of cosmic pinball.

The object is the upper stage of a Falcon 9, roughly the size of a five-story building. The prediction comes from Bill Gray, the astronomer behind the orbit-tracking website Project Pluto, whose software first spotted the looming collision back in September 2025.

What the Collision Will Look Like

The abandoned Falcon 9 upper stage — about 12 meters long and weighing 4,000 kilograms — is predicted to impact near Einstein Crater at roughly 8,750 km/h, producing a crater 20–30 meters wide and a multi-kilometer ejecta plume. Its hollow structure should crush rather than deeply penetrate, making the impact flash and dust cloud potentially observable from Earth.

The upper stage will strike the lunar surface at approximately 5,400 miles per hour, releasing energy equivalent to about 3 tons of TNT. The collision could excavate roughly 1.12 to 1.2 million kilograms of lunar material. Most excavated particles should move relatively slowly and fall back within seconds — about half of the particles in simulation returned to the surface within five seconds, potentially forming secondary craters.

The collision itself will occur on the moon's sunlit surface and won't be visible from Earth even in large telescopes, but the resulting dust cloud may be, according to new research published by researchers at the Los Alamos National Laboratory and NASA Ames Research Center. Cameras capable of recording very high-speed video will be needed to capture the brief flash produced at the moment of impact and the rapidly developing dust plume that follows.

A Rare Scientific Opportunity

The crash is a rare opportunity to record an artificial impact in real time. It will also let scientists test a new method for pinpointing exactly where objects strike the moon, which could help prepare for future lunar seismic experiments.

Brent Garry, a project scientist for NASA's Lunar Reconnaissance Orbiter (LRO) at Goddard Space Flight Center, says LRO will be passing over the projected rocket stage crash site about seven days prior to the impact and about seven days after. Scientists hope the event will improve impact models, future moonquake experiments, and tracking of debris between Earth and the Moon.

As one researcher put it, "Watching this one gives us a rare chance to open up ejecta-plume science and calibrate those models against a real event, which matters for every future thing we deliver to the moon."

A Wake-Up Call for Space Debris

This event is a very rare opportunity to witness the aftermath of an object striking the moon, though it also highlights the dangers of space junk as NASA prepares to build a moonbase. Over 600 Falcon 9 rockets have been launched. Most upper stages are either in orbits close to Earth or have already re-entered the atmosphere. This particular stage, however, slipped into a gravitational no-man's-land with only one possible ending.

On August 5, the Moon will be near last quarter, around 56% illuminated — conditions that may favor observation of any rising plume against the dark lunar sky. Astronomers across the Americas will have the best vantage point. Whatever they see — or don't see — will sharpen humanity's understanding of what happens when our castoffs finally come home to roost, and how we'll need to manage the growing cloud of debris surrounding both Earth and the Moon as lunar ambitions accelerate.