An abandoned four-tonne SpaceX Falcon 9 rocket stage is set to crash into the moon on Wednesday at 5,400 mph, generating an impact equivalent to three tons of TNT. NASA and independent astronomers confirm the collision poses no danger to Earth while offering a rare scientific opportunity to study lunar debris.
A school-bus-size piece of orbital hardware is hurtling toward a high-speed lunar collision. The object, which has drifted in space since last year, is due to strike the moon’s surface near the Einstein Crater on its sunlit western limb, according to tracking data analyzed by NASA and independent experts.
The upper stage measures roughly 40 feet (12 meters) long and weighs between 8,818 and 10,000 pounds (4,000 to 4,500 kilograms). It originally lifted off on January 15, 2025, from the Kennedy Space Center in Florida, carrying a pair of commercial lunar landers for Firefly Aerospace and ispace.
Orbital Mechanics and the Unplanned Trajectory
While the Falcon 9 booster handling the initial liftoff returned safely to Earth, the second-stage vehicle remained in space to propel the payloads toward the moon. For standard low-Earth orbit missions, operators normally dispose of upper stages by burning them up in Earth’s atmosphere. However, high-energy lunar missions require different operational maneuvers.
Julianna Scheiman, SpaceX director of NASA science and Dragon programs, explained during a Monday news conference that the second stage was managed according to appropriate rules and regulations. A combination of solar activity and gravitational forces ultimately diverted the spent stage onto a chaotic orbit intersecting the lunar path.
“What has happened is essentially a mixture of solar activity and gravity forces have put it on a path toward the moon.”
Julianna Scheiman, SpaceX director of NASA science and Dragon programs
Astronomers noted that a small course correction shortly after the 2025 launch could have directed the stage into a stable orbit around the sun. Instead, independent astronomers tracking publicly available data discovered the stage’s terminal trajectory earlier this year, prompting NASA’s Center for Near Earth Object Studies to confirm a 100% impact probability.
Impact Physics and Telescope Viewing Strategies
The impact is scheduled for early Wednesday, with experts forecasting a collision speed of approximately 5,400 mph (8,690 km/h) to 5,436 mph, which is more than seven times the speed of sound. The strike will release energy comparable to three tons of TNT, carving out a crater estimated between 60 and 90 feet (18 to 30 meters) wide and 12 to 16 feet (4 to 5 meters) deep.
Observers across eastern parts of the United States and Canada, alongside much of South America, are positioned with the best viewing angles during the wee hours. Dr. Paul Wiegert, a professor of astronomy and physics at Western University in London, Ontario, noted that the impact location sits where the number 10 would be on a clock face. Because that particular lunar sector is currently sunlit, the instantaneous flash will be muted by natural sunlight, though a towering plume of ejected dust and rock could stretch for miles.
“The gravity on the moon is low and there is no wind to blow the dust away.”
Benjamin Fernando, Los Alamos National Laboratory
That atmospheric absence allows debris plumes to linger in view of professional and amateur telescopes for tens of minutes. This event marks only the second documented accidental lunar strike by a human-made rocket body, following a Chinese rocket segment that created craters on the lunar far side in March 2022.
Scientific Value and Future Lunar Safety Concerns
Space agencies view the unplanned crash as a valuable, albeit accidental, full-scale experiment. With the United States, China, and private aerospace firms accelerating plans for permanent bases and human habitation under initiatives like NASA’s Artemis program, understanding how hypervelocity debris interacts with unshielded regolith is becoming an operational priority.
NASA’s Lunar Reconnaissance Orbiter and South Korea’s Danuri spacecraft are positioned to observe the site. Danuri is expected to pass within a mile or two of the SpaceX stage just two minutes before the collision, while NASA’s Meteoroid Environments Office utilizes ground-based optics to image the ejecta.
“Part of the reason for our interest in this event is to figure out how much of a hazard debris impacts pose to future astronauts.”
Benjamin Fernando, Los Alamos National Laboratory
As commercial traffic increases, scientists emphasize that managing spent hardware in chaotic cislunar orbits must improve before permanent lunar settlements take root. NASA and SpaceX are currently discussing preventive measures for future high-energy missions to avoid leaving massive debris stages adrift in deep space.
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