In the quiet routine of data review, a NASA scientist glimpsed something the moon had not offered in perhaps a century: the fresh scar of a cosmic collision. Robert Wagner, analyzing lunar imagery from the Lunar Reconnaissance Orbiter, identified a crater formed between April and May 2024 on the moon's eastern edge — 728 feet wide, 141 feet deep, and now the largest newly formed impact crater ever documented in the solar system. Named for lunar scientist Tom McGetchin, who died just months before the impact, the discovery reminds us that even the most familiar celestial body still holds the ca
NASA discovers largest newly formed moon crater in a century
Your stone, if well shaped, will hold its weight as time sweeps past
Mark
So Wagner was just checking data quality and found this by accident?
Mimi
Not quite accident—he was looking at lunar images as part of his job, comparing maps. But yes, the discovery came during routine work, not a targeted search. The bright patch with the dark ring around it is what caught his eye.
Luke
How confident are we that this is actually the largest newly formed crater in the solar system? Is that NASA's assessment, or is it peer-reviewed?
Mimi
NASA is making that claim based on the documented record. The Lunar Reconnaissance Orbiter has been imaging the moon for years, so we have a pretty complete picture of what's formed recently.
Mark
And the timing—April to May 2024—how do they narrow it down to that window?
Mimi
They compared images taken before and after that period. The crater wasn't there in earlier images, and it was there by late May. So the impact happened in that window.
Luke
But they don't know exactly when, or what hit it?
Mimi
Right. They know it was a comet or asteroid, but not which one or the precise date. The window is all they can say.
Mark
The naming after McGetchin—that's a nice touch. Was he famous?
Mimi
He was a respected lunar scientist. He died just before the crater formed, which adds something poignant to the naming.
Luke
Do we know what his main contributions were to lunar science?
Mimi
The source doesn't detail his specific research, just that he was a lunar scientist and that he left behind this reflection on legacy and work.
Mark
Once in a century—does that mean we should expect another one soon, or is that just an average?
Luke
It's an estimate of frequency, not a prediction. The next one could be tomorrow or in two hundred years.
The Pulse
- A once-in-a-century lunar impact went unwitnessed in real time — only the bright ejecta halo left behind on a routine scan gave it away.
- The sheer scale of the find — a crater wider than two football fields, carved in a matter of moments — disrupts any assumption that the moon is a static, settled world.
- Wagner's discovery hinged on the painstaking, unglamorous work of comparing before-and-after images, a reminder that landmark science often lives inside the ordinary.
- The naming of the crater after Tom McGetchin, who wrote about legacy and enduring work just before his death, gives the discovery an unexpectedly human resonance.
- The find is now anchoring new questions about the frequency and force of solar system bombardment, with McGetchin Crater serving as a rare, dateable reference point for lunar geology.
In the quiet routine of data review, a NASA scientist glimpsed something the moon had not offered in perhaps a century: the fresh scar of a cosmic collision. Robert Wagner, analyzing lunar imagery from the Lunar Reconnaissance Orbiter, identified a crater formed between April and May 2024 on the moon's eastern edge — 728 feet wide, 141 feet deep, and now the largest newly formed impact crater ever documented in the solar system. Named for lunar scientist Tom McGetchin, who died just months before the impact, the discovery reminds us that even the most familiar celestial body still holds the capacity to surprise, and that the universe continues its slow, violent reshaping of worlds whether or not we are watching.
Robert Wagner was running a routine quality check on lunar imagery when a bright patch ringed by a dark halo caught his eye — the kind of subtle anomaly that could easily scroll past unnoticed. He pulled the before-and-after images and confirmed it: the moon had been struck by a comet or asteroid sometime between April 11 and May 22, 2024, producing the largest newly formed impact crater ever documented in the solar system.
The crater measures 728 feet across and 141 feet deep, carved into the moon's eastern edge in an event NASA estimates happens only once a century, if that. Wagner had stumbled upon it not through any targeted search, but through the slow, systematic work of lunar mapping made possible by the Lunar Reconnaissance Orbiter Camera — orbiting roughly 60 miles above the surface and quietly assembling one of the most detailed records of the moon ever compiled.
The crater was named McGetchin Crater, after lunar scientist Tom McGetchin, who died just three months before the impact occurred. In a memorial reflection, McGetchin had written about how individual identity fades while the work endures, becoming part of the structure others build upon. His name now marks the moon's largest and most recently formed crater — a permanent inscription of that philosophy into the lunar surface itself.
For scientists, the discovery is more than a record-breaker. The bright ejecta and disturbed regolith that Wagner spotted are the unmistakable signature of a fresh impact, offering a rare, precisely dated window into the forces that continue to reshape the worlds around us. The moon, mapped with increasing precision for decades, has reminded us it still has surprises left to give.
Robert Wagner was doing what he had done dozens of times before—running a routine quality check on lunar imagery—when something stopped him cold. There, on the global map of the moon scrolling across his screen, was an unusually bright patch ringed by a dark halo. It was the kind of detail that could easily be missed, a small anomaly in an ocean of data. But Wagner knew what he was looking at. He pulled the before-and-after images and confirmed what the pattern suggested: the moon had been struck by a comet or asteroid, and the impact had carved out the largest newly formed crater ever documented anywhere in the solar system.
The crater, now named McGetchin Crater, formed sometime between April 11 and May 22, 2024, on the moon's eastern edge. Its dimensions are staggering in their own right—728 feet across and 141 feet deep—but what makes the discovery truly remarkable is its rarity. NASA scientists estimate that an impact of this magnitude occurs on the lunar surface roughly once every century, or even less frequently. Wagner's routine scan had stumbled upon an event that unfolds on a timescale most humans will never witness.
The naming of the crater carries its own weight. Tom McGetchin was a lunar scientist whose work shaped how we understand the moon's geology. He died three months before this crater formed, but not before leaving behind a reflection on legacy that reads almost like a prophecy. In a memorial published by the U.S. Geological Society of America, McGetchin wrote about the quiet work of shaping stone, about how individual identity fades but the work endures, becoming part of the structure that others build upon. His name now marks the largest and most recently formed crater ever identified on the lunar surface—a permanent monument to that philosophy.
The discovery itself was made possible by NASA's Lunar Reconnaissance Orbiter Camera system, which has been orbiting roughly 60 miles above the moon for years, capturing high-resolution black-and-white images and multispectral data. Over time, these images have been assembled into detailed lunar maps that have become the foundation for ongoing scientific discovery. What began as a systematic effort to document the moon's surface has yielded something far more dramatic: evidence of a cosmic collision that occurred in the recent past, at least in geological terms.
Wagner's discovery underscores how much remains to be learned about the moon, even as we have mapped it with increasing precision. The bright patch and dark halo he spotted are the signature of a fresh impact—the ejecta and disturbed regolith that mark where rock from space collided with the lunar surface. Each new crater tells a story about the solar system's ongoing bombardment, about the forces that continue to shape the worlds around us. For lunar scientists, McGetchin Crater is not just a landmark; it is a window into processes that operate on timescales we rarely get to observe directly.
Notable Quotes
Shaping your stone means quietly doing your job as well as you can. Your identity will soon be lost to history but your stone, if well shaped and polished, will fit into the structure we call civilization and hold its weight as time sweeps past us.— Tom McGetchin, lunar scientist, in a memorial published by the U.S. Geological Society of America
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