The first unintentional lunar impact that we've had
A four-ton SpaceX rocket stage from a 2015 NASA satellite mission will crash into the Moon's dark side at 5,500+ mph, confirmed by multiple astronomers. The impact will create an observable crater but won't be visible from Earth; similar untracked collisions may have occurred from decades-old abandoned orbital debris.
- SpaceX booster launched in 2015 to deploy NASA's Deep Space Climate Observatory satellite
- Four-ton rocket stage will impact Moon's far side on March 4, 2022, at 5,500+ mph
- At least 50 objects abandoned in deep Earth orbit during 1960s-80s remain untracked
- Impact will create observable crater but won't be visible from Earth in real-time
A SpaceX rocket booster abandoned in orbit since 2015 will collide with the Moon on March 4, 2022, marking the first unintentional lunar impact tracked by astronomers and raising concerns about space debris regulation.
Seven years of silence in the void ended with a calculation. A SpaceX rocket booster, launched in 2015 to carry a NASA climate satellite into orbit, had been drifting through space ever since—a four-ton piece of machinery with nowhere to go and no one watching closely. Then, in January 2022, it passed near the Moon. That close encounter changed everything.
Astronomer Bill Gray, who runs Project Pluto—software designed to track asteroids and orbital debris for NASA-funded observation programs—noticed something in the numbers. The booster's trajectory had shifted. He watched it again a week later and ran the calculations once more. The conclusion was unavoidable: on March 4, the rocket stage would slam into the Moon's far side at more than 5,500 miles per hour. Gray reached out to amateur astronomers around the world to verify his work. They confirmed it. There would be an impact.
This was not a planned collision. Spacecraft have intentionally crashed into the Moon before—during Apollo missions to test instruments, and in 2009 when NASA deliberately sent a rocket stage into the lunar south pole searching for water. Those were controlled experiments, part of the scientific mission. This was different. This was debris, abandoned in orbit, finally coming home to a place it was never meant to reach. "I've been tracking junk of this sort for about 15 years," Gray told reporters. "And this is the first unintentional lunar impact that we've had."
But Gray's discovery raised a troubling question: how many others had there been? Astronomer Jonathan McDowell pointed out that at least fifty objects launched into deep Earth orbit during the 1960s, 70s, and 80s were simply left there, never tracked, never monitored. They could have crashed into the Moon years ago, and no one would have known. The universe keeps its own counsel about such things.
The impact itself would not be visible from Earth. No flash in the sky, no dramatic moment to witness. But it would leave a crater—a scar on the lunar surface that spacecraft like NASA's Lunar Reconnaissance Orbiter or India's Chandrayaan-2 could photograph and study. Scientists would learn something about the Moon's geology from the collision, turning an accident into data.
SpaceX, for its part, had developed a different approach to the problem. The company brings its rocket boosters back through Earth's atmosphere, allowing them to burn up over the ocean rather than drift into space. The first stages are recovered and reused. But this booster, launched seven years earlier, had been left behind. It was part of an older way of doing things—a way that was leaving more and more junk scattered across the orbital landscape.
Gray warned that more unintentional impacts would likely follow. The United States and China were both launching more missions, leaving more debris in orbit. Even as plans moved forward for a new space station to orbit the Moon, the old problem of abandoned machinery remained unsolved. The Moon was about to receive an unwanted visitor, and unless something changed, it would not be the last.
Citas Notables
I've been tracking junk of this sort for about 15 years. And this is the first unintentional lunar impact that we've had.— Astronomer Bill Gray
There're at least 50 objects that were left in deep Earth orbit in the '60s, '70s and '80s that were just abandoned there. We didn't track them.— Astronomer Jonathan McDowell
La Conversación del Hearth Otra perspectiva de la historia
Why does an impact that happened seven years after launch suddenly matter now?
Because the booster drifted in what mathematicians call a chaotic orbit—unstable, unpredictable. It took a close pass by the Moon in January to shift its trajectory enough that we could finally see where it was headed.
So Gray couldn't have predicted this in 2015?
No. The orbit was too chaotic. You need the actual gravitational nudge from the Moon to know what comes next. That's what made January so important—it was the moment the future became visible.
If it won't be visible from Earth, does the impact actually matter?
It matters because it leaves a crater. Spacecraft can study that crater and learn about the Moon's composition. But more importantly, it matters because it's the first time we've tracked an unintentional collision. It's proof of a problem we've been ignoring.
What problem?
Decades of abandoned rockets in orbit. Fifty objects from the Cold War era just left floating in space. We don't know if they've hit the Moon already. We weren't watching.
And SpaceX doesn't do this anymore?
No. They bring boosters back to Earth now, let them burn up over the ocean. But this one was from the old way. It's a relic of when we didn't think about what happened to our trash.
What happens next?
More impacts, probably. Unless we start regulating how we leave orbit. The US and China are launching more missions all the time. Without rules about debris, the Moon becomes a dumping ground.