James Webb telescope reveals 'Sleeping Beauty' galaxies in the early universe — snoozing where they weren't supposed to exist
Astronomers have discovered over a dozen "dormant" galaxies that paused their star formation within the first billion years after the Big Bang.
The discovery, made with data from the James Webb Space Telescope (JWST), illuminates a fascinating phase in the lives of early galaxies and could provide more clues about how galaxies evolve.
There are several reasons why galaxies may stop forming new stars. One is the presence of supermassive black holes at their centers. These behemoths emit intense radiation that heats and depletes cold gas, the most important ingredient for star formation. Additionally, larger neighboring galaxies can strip away this cold gas or heat it, leading to a halt in star formation. As a result, these galaxies may remain dormant indefinitely, or become "quenched."
Another reason galaxies become inactive is stellar feedback. That's when the gas in the galaxy gets warmed and expelled due to stellar processes like supernovas, intense stellar winds, or the pressure associated with starlight. The galaxy thus goes through a temporary "quiet" period.
"This is usually a temporary phase, which usually lasts about 25 million years," Alba Covelo Paz, a doctoral student at the University of Geneva and the lead author of a new study describing the findings, told Live Science in an email. Over millions of years, the gas that was pushed out falls back in, and the warm gas cools again. Once there is enough cold gas again, the galaxy can start forming new stars.
While the dormant phase is commonly observed in nearby galaxies, astronomers have found only four dormant galaxies in the first billion years of the universe. Of those, three had masses below a billion solar masses and one had a mass above 10 billion solar masses. The limited observations and scattered properties of dormant galaxies were not sufficient to get a clear picture of early star formation.
Related: 'Previously unimaginable': James Webb telescope breaks its own record again, discovering farthest known galaxy in the universe
But using JWST's sensitive spectroscopic data, an international team of astronomers discovered 14 dormant galaxies with a wide range of masses in the early universe, showing that dormant galaxies are not limited to low or very high mass ranges.
The findings were uploaded to the preprint database arXiv on June 27 and have not been peer-reviewed yet.
Taking a breather
Researchers didn't expect to see dormant galaxies in the early universe. Because these galaxies are young, they should be vigorously forming many new stars, astronomers thought. But in a 2024 paper, researchers described the first discovery of a dormant galaxy in the early universe.
"The first discovery of a dormant galaxy in the early universe was such a shock because that galaxy had been observed before with Hubble, but we could not know it was dormant until JWST," Paz said.
That's because, unlike the Hubble Space Telescope, JWST's NIRSpec instrument can both see light from these galaxies that has been redshifted to near-infrared wavelengths, and also provide spectroscopic details about it.
Astronomers were curious to know why early galaxies stopped forming stars and whether this was common among a wide range of stellar masses. One hypothesis was that the galaxies had bursts of star formation and then quiet periods, before starting again. Paz and her team looked for the galaxies that were in between bursts of star formation. They used publicly available galaxy data in the DAWN JWST Archive.
They examined the light of about 1,600 galaxies, looking for signs of new stars not forming. They also focused on clear signatures of middle-aged or old stars in the galaxies' light. The team found 14 galaxies, ranging from about 40 million to 30 billion solar masses, that had paused star formation.
"We now found 14 sources supporting this burstiness process, and we found that all of them have halted star formation between 10 [million] and 25 million years before we observed them," Paz explained. That means these 14 galaxies were found to follow a stop-and-go fashion of star formation rather than continuously forming stars, and they have been quiet for at least 10 million to 25 million years.
This relatively short snooze hints that stellar feedback, such as supernovas or stellar winds, caused them to go quiet and that they may eventually restart their stellar factories, Paz said.
However, there is still uncertainty, she added. "We cannot confirm it for sure because we don't know how long they will remain dormant, and if they happen to stay dormant for another 50 million years, this would mean the cause of their quenching is different," Paz explained.
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This scenario would suggest that the galaxies are dead. Nevertheless, the current properties of these galaxies support a cycle of fits and starts.
Because dormant galaxies are so rare, much about them remains mysterious. However, astronomers hope future observations will help shed light on these snoozing star factories. An upcoming JWST program called "Sleeping Beauties" will be dedicated to discovering dormant galaxies in the early universe, Paz said. This program will allow astronomers to estimate how long a galaxy remains in this quiet phase and help them understand the bursty star formation process.
"There are still many unknowns for us, but we are one step closer to unravelling this process," Paz said.
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The Voyager Declaration was published July 21 as a formal statement protesting the proposed science cuts and preemptive actions already enacted by NASA leadership. The letter was signed by nearly 300 current and former NASA employees, 150 of whom chose to do so anonymously, "due to the culture of fear of retaliation cultivated by this administration," the letter states. "Major programmatic shifts at NASA must be implemented strategically so that risks are managed carefully," it states. "Instead, the last six months have seen rapid and wasteful changes which have undermined our mission and caused catastrophic impacts on NASA's workforce." Their grievances were listed in the letter (included verbatim): We dissent to changes to NASA's Technical Authority capacities that are driven by anything other than safety and mission assurance. We dissent to the closing out of missions for which Congress has appropriated funding. We dissent to implementing indiscriminate cuts to NASA science and aeronautics research. We dissent to NASA's non-strategic staffing reductions. We dissent to canceling NASA participation in international missions. We dissent to the termination of NASA contracts and grants for reasons unrelated to performance. We dissent to the elimination of programs aimed at developing and supporting NASA's workforce. Public impact Protesters at the July 20 demonstration warned of broader impacts that such substantial cuts could have on the public at large. NASA contract employees Justin and Madeline said they attended the protest to raise awareness about all the contributions to society that have come from NASA research and innovations. "A lot of the stuff we have on Earth, like our cell phones, hurricane coverage, that's all because of NASA. And defunding NASA means defunding all of that and making life worse for everyone," Justin told "And I don't think a lot of people realize that." NASA employee Ben put much of NASA's contributions into perspective by breaking down the numbers: "In 2023-2024, for every dollar that NASA got in tax revenue, NASA generated $3 in economic output in the United States. Our actual budget was $25 billion and we generated $75 billion from that $25 billion. We generated 300,000 jobs across the country … And setting all of that aside, what about things you can't put a price on?" His $75 billion output figure, while a reasonable estimate, is not yet confirmed. NASA has not released full economic impact reports for 2023 or 2024. Ben cited examples of NASA spinoff technology — advances in lasers developed by scientists building the James Webb Space Telescope are helping doctors perform eye surgeries on Earth, and innovations from the Hubble Space Telescope have contributed to mammogram imaging and technology used at hardware stores to match paint colors. "None of this stuff even is accounted for in that three-to-one benefit that NASA generates directly to the economy," Ben said. "Why, pray tell, in the name of efficiency, so called, is NASA the place you want to start slashing funding from?" "There's a lot of inventions that NASA has, if not created, at least catalyzed," Will told "If we zero out so many things, no longer are we going to have the great leap for mankind that Armstrong is so famously talking about." Human cost Julie echoed those sentiments, highlighting not a mission, but a whole department on the chopping block: NASA's Office of STEM Engagement (OSTEM). "OSTEM has been zeroed out completely," she said. "That not only has an effect on what we do at NASA in terms of workforce development, but also kids across the entire country won't have access to those programs, won't have access to scholarships that let them go on to grad school and let them learn other things." "A lot of what NASA does is train teachers, so teachers can train students. If that's something that goes away completely, it's going to impact the entire next generation of students." - Julie Another protester, who asked to be identified only as "MC", has worked as a teacher across a wide field of age ranges and learning abilities. "Every place I've ever taught, or every program I've ever supported — everybody needs science," she said. "Every curriculum I've ever developed had science … Science of all kinds is incredibly important. And space — space is where we're going." One protester, who identified herself as the mother of a NASA employee, stressed the value of empowering the next generation. "It's very important that our kids have their dreams and reach those dreams," she said. "If NASA is cut the way it is, STEM education is cut, science is cut, research is cut — we won't have kids who have dreams anymore." George is part of a team responsible for testing spacecraft at Goddard. He attended Sunday's protest alongside his wife and three daughters. "Goddard is looking at basically being shut down, and we have a whole bunch of people that know how to build individual, specific scientific spacecraft," he told "If we lose that [technical knowledge], it's gone." "Where are we going to learn how to do that again?" George added. "Are we going to have to have another Challenger moment to learn how to do that again? Maybe." George's daughters said they wanted to attend the protest to support their father. "It's his job, so obviously that's important to us," his eldest, 15, said. But she's also worried about what the future might look like if science takes a backseat at the space agency. "I think that we should also be concerned about science over the future generations," she said, calling the budget's potential ramifications a "big loss." Job security is on the forefront of many NASA employees and contractors, many of whom have already received notice that their mission is at "high risk" of cancellation. Justin hasn't received such a notice yet, but says the mission he works on studies climate change by measuring ice caps, "so I am assuming a couple things here," he said. That insecurity is already pushing some NASA scientists to look outside the agency. Amid potential layoffs, some are considering not just leaving the space agency, but the United States altogether. A lack of stability in the U.S. science community is opening the door for international recruitment. "Right now, Europe and Asia, every other country in the world, sees what's happening, and they're extending offers," Finch said to the crowd. "The next day, the members of the workforce are gone." Justin is still mulling over his options if his program gets canceled. But he came to a quick alignment with Madeline's stance that she would "probably work for a different country that values science." "That would be the one," Justin said in agreement. Several European institutions have already begun reaching out to scientists and engineers across the U.S. to gauge people's interest in continuing their work abroad. One representative said in an email obtained by that the responses to their initial outreach were "overwhelming (and worrying)." With budget negotiations still ongoing in Congress, protesters are urging lawmakers to act before NASA loses the talent and infrastructure that made its past achievements possible. "I don't want to be a member of the first generation of humans that stops exploring," Finch said. "We are not the ones who will suffer most — it is every generation of humans that will be set back by our abdication."
