A SpaceX Falcon 9 upper stage rocket body is on a confirmed trajectory to collide with the moon at 5,400 mph (8,700 kph) on August 5, 2026, at 6:35 UTC. According to Bill Gray, the spent stage will impact near the Einstein crater on the moon’s western limb.
Impact Dynamics and Scientific Opportunity
The rocket body measures 39 feet (12 meters) long and 13 feet (4 meters) wide and weighs approximately 8,800 pounds (4,000 kilograms). Because the moon lacks an atmosphere to provide friction or deceleration, the object will strike the surface at a velocity of 1.51 miles (2.43 kilometers) per second. Unlike solid natural impactors such as asteroids, the hollow structure of the rocket stage is expected to produce a distinct ejecta plume.
According to a July 2026 paper by researchers at the University of Texas-Austin, the collision should gouge a new crater roughly 66 to 98 feet (20 to 30 meters) wide. Lead author William Jo noted that the event offers a rare chance to calibrate impact models for human-made debris. The research team predicts the central ejecta spike could reach altitudes of 45 to 60 miles (75 to 100 km), potentially remaining visible for several minutes through specialized imaging equipment.
Observing the Collision from Earth
While the flash of the impact will be brief—lasting less than a second—the resulting dust plume may be detectable to observers in the Americas with the right equipment. The timing of the strike, occurring at 1:35 a.m. CDT, favors viewers in the eastern half of the United States, Canada, and South America. The impact site is expected to lie near the moon’s terminator, or day-night boundary, which could enhance the visibility of the debris against the darker lunar landscape.
Bill Gray, who has tracked the object since September 2025, warns that the rocket is “spinning and changing brightness rapidly,” making it a difficult target for amateur observation. He advises that binoculars will be insufficient; success likely requires a medium- to large-aperture telescope configured for high-speed video recording.
Tracking Challenges for High-Altitude Space Junk
The Falcon 9 upper stage was used to launch the Blue Ghost and Hakuto-R lunar missions in January 2025. While the first stage (booster) returns to Earth and is reused, the upper stage does not return. According to Gray, tracking these objects is a complex task because they often mimic the movement of asteroids.
“The asteroid surveys would actually prefer not to observe space junk,” Gray explained. “Time spent observing junk is time not spent finding rocks.” Gray’s work involves providing software and orbital calculations to help asteroid hunters filter out artificial debris, ensuring that high-altitude objects—which are largely ignored by military tracking systems—do not trigger false alarms for near-Earth objects.
Frequently Asked Questions
- Will the impact be visible to the naked eye? No. Specialized telescopes and high-speed imaging are required.
- Why is the rocket hitting the moon? After the upper stage of the Falcon 9 completed its own mission to boost these two moonward, it became just another piece of space junk.
- How do researchers track these objects? Astronomers use ground-based observations to calculate orbits, accounting for the “gentle push” of sunlight, which can slightly alter the trajectory of a tumbling, hollow object.
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