It's like finding buried treasure in the cosmic dust
In a star-forming region 7,500 light-years away, humanity's newest eye on the cosmos has done what no instrument before it could: pierce the ancient veil of cosmic dust to reveal two dozen newborn stars in the act of becoming. Led by astronomer Megan Reiter of Rice University, a team of researchers used the James Webb Space Telescope's infrared vision to detect the jets and outflows of protostars hidden within NGC 3324's Cosmic Cliffs — stars that had been forming, unseen, for thousands of years. The discovery is less a conclusion than a threshold, suggesting that the universe holds far more hidden creation than we have ever been able to witness.
- For decades, cosmic dust in NGC 3324 blocked telescopes like Hubble from seeing the most active star-forming regions, leaving a fundamental chapter of stellar birth effectively unreadable.
- Webb's infrared camera cut through that obscuring dust at a precise wavelength of 4.7 microns, detecting molecular hydrogen jets streaming from protostars in opposite directions like cosmic snowplows.
- The 24 newly revealed stars exist in a fleeting, intense phase of accretion lasting only a few thousand years — a blink in stellar time — making their detection both urgent and extraordinarily rare.
- Researchers from Rice University, Caltech, the University of Arizona, and institutions in London and Edinburgh collaborated to sift through Webb's data filter by filter, region by region, to surface what one scientist called 'buried treasure.'
- If a seemingly quiet patch of the Cosmic Cliffs conceals this much hidden stellar activity, astronomers now face the staggering possibility that star-forming regions across the universe are far more populated than any prior survey has suggested.
Megan Reiter was examining one of the first images from NASA's James Webb Space Telescope when she and her team noticed something the universe had long concealed. Buried within the Cosmic Cliffs of NGC 3324 — a star-forming region 7,500 light-years away in the constellation Carina — were the signatures of two dozen newborn stars that no instrument had ever detected. The findings, published in the Monthly Notices of the Royal Astronomical Society, represent one of the earliest and most concrete demonstrations of what Webb can do.
Reiter's team, drawn from Rice University, Caltech, the University of Arizona, and observatories in London and Edinburgh, focused on a portion of NGC 3324 that had been studied for decades but remained largely opaque. Hubble and other telescopes had mapped the region, yet the same cosmic dust from which stars are born had blocked their view of the most dynamic activity. Webb's infrared camera was built precisely for this: to see through the dust and find the jets of gas that young stars eject as they pull in surrounding material.
Analyzing images at 4.7 microns, the team found molecular hydrogen streaming outward from protostars in opposite directions — jets that act like snowplows clearing paths through nebular clouds. These outflows mark the earliest and most fleeting phase of stellar development, a window of intense accretion lasting only a few thousand years in a star's multimillion-year life. Co-author Nathan Smith called these jets signposts for the most exciting moment in star formation, visible only while a protostar is actively feeding.
What the discovery ultimately reveals is not just the power of Webb's engineering — its vast mirror collecting light like what Reiter called a 'huge light bucket' — but the sheer abundance of hidden creation in even the quietest corners of the sky. If one seemingly sparse patch of the Cosmic Cliffs contains this much invisible star-forming activity, the implications for our understanding of the universe are only beginning to come into focus.
Megan Reiter was staring at one of the first images ever captured by NASA's James Webb Space Telescope when she and her team noticed something the universe had been hiding for a long time. Buried in a star-forming region called the Cosmic Cliffs, located 7,500 light-years away in the southern constellation Carina, were the signatures of two dozen newborn stars that no one had ever seen before. The discovery, published in December's issue of the Monthly Notices of the Royal Astronomical Society, marks one of the first concrete demonstrations of what the Webb telescope can do—and it hints at how much more is waiting to be found.
Reiter, an assistant professor of physics and astronomy at Rice University, led a team that included researchers from Caltech, the University of Arizona, Queen Mary University in London, and the Royal Observatory in Edinburgh. They focused on a portion of NGC 3324, a cluster of stars that astronomers have studied for decades but which had remained largely opaque. The Hubble Space Telescope and other observatories had mapped the region, but cosmic dust—the same material from which stars form—had blocked their view of the most interesting activity. Webb's infrared camera was designed precisely for this task: to see through the dust and detect the jets of gas and material that young stars eject as they gather material from their surroundings.
The team analyzed images at a specific infrared wavelength of 4.7 microns and found evidence of molecular hydrogen flowing outward from young stars in outbursts and jets. Many of these outflows appeared to originate from protostars—the earliest stage of stellar development—that would eventually become low-mass stars similar to our sun. These jets are not random; they stream out in opposite directions from the poles of young stars, clearing paths through the nebular clouds like snowplows pushing through snow. The discovery revealed star-forming activity in a region that had appeared relatively quiet in previous observations.
What makes this finding significant is not just the number of stars found, but what their presence tells us about how the universe actually works. Within their first 10,000 years of existence, newborn stars are actively pulling in material from the gas and dust around them—a process called accretion. This window of intense activity is brief, typically lasting only a few thousand years in the earliest phase of a star's multimillion-year development. It has been extraordinarily difficult for astronomers to study because it happens so fast and because dust obscures the view. Nathan Smith, a co-author from the University of Arizona, described these jets as signposts marking the most exciting phase of star formation, visible only during the narrow window when a protostar is actively feeding.
The discovery also showcases the engineering that went into Webb itself. The telescope functions as what Reiter called a "huge light bucket"—its massive mirror collects far more light than smaller telescopes, allowing it to detect fainter objects and smaller features. It also provides exceptional angular resolution, the ability to distinguish fine details in distant objects. Jon Morse of Caltech noted that finding these jets required what he described as a "deep dive" into the data, examining each filter separately and analyzing each region individually. "It's like finding buried treasure," he said.
Reiter emphasized that the findings reveal not just the power of the instrument but the reality of what is happening in even the quietest corners of the cosmos. The Cosmic Cliffs region had seemed relatively sparse in earlier surveys, yet Webb's infrared vision uncovered two dozen previously invisible young stars in just one portion of the field. If a seemingly ordinary patch of sky contains this much hidden star-forming activity, the implications are staggering. Astronomers are only beginning to understand what Webb will reveal as it continues to observe the universe through the dust that has always obscured our view.
Notable Quotes
What Webb gives us is a snapshot in time to see just how much star formation is going on in what may be a more typical corner of the universe that we haven't been able to see before— Megan Reiter, Rice University astronomer
Jets like these are signposts for the most exciting part of the star formation process. We only see them during a brief window of time when the protostar is actively accreting— Nathan Smith, University of Arizona
The Hearth Conversation Another angle on the story
Why does it matter that we found these particular stars? Aren't astronomers always discovering new ones?
These aren't just new stars—they're newborns caught in the act of forming, in a phase that lasts only thousands of years. We've never been able to see this phase clearly before because dust blocks the view. Webb changes that.
So the dust that hides them is also what they're made of?
Exactly. The same clouds of dust and gas that obscure the view are the nurseries where stars are born. Webb can see through the dust to watch stars pulling material in and ejecting jets outward.
What does finding 24 stars in one region tell us about the rest of the universe?
It suggests we've been systematically underestimating how much star formation is happening everywhere. If a quiet corner of the sky has this much hidden activity, we need to rethink our models of how common and frequent star birth really is.
Is this the kind of discovery that changes astronomy, or is it more of a proof of concept?
It's both. It proves Webb works as designed, but it also opens a door. We're seeing that the universe is far busier than we thought, especially in the early stages of star formation that we've barely been able to study until now.
What happens next?
Webb keeps looking. Every image it takes will likely contain similar surprises. We're going to find thousands of these hidden young stars, which means we'll finally understand how stars like our sun actually form.