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By NASA
5 Min Read Webb Finds Early Galaxies Weren’t Too Big for Their Britches After All
This image shows a small portion of the field observed by NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) for the Cosmic Evolution Early Release Science (CEERS) survey. The full image appears below. Credits:
NASA, ESA, CSA, S. Finkelstein (University of Texas) It got called the crisis in cosmology. But now astronomers can explain some surprising recent discoveries.
When astronomers got their first glimpses of galaxies in the early universe from NASA’s James Webb Space Telescope, they were expecting to find galactic pipsqueaks, but instead they found what appeared to be a bevy of Olympic bodybuilders. Some galaxies appeared to have grown so massive, so quickly, that simulations couldn’t account for them. Some researchers suggested this meant that something might be wrong with the theory that explains what the universe is made of and how it has evolved since the big bang, known as the standard model of cosmology.
According to a new study in the Astrophysical Journal led by University of Texas at Austin graduate student Katherine Chworowsky, some of those early galaxies are in fact much less massive than they first appeared. Black holes in some of these galaxies make them appear much brighter and bigger than they really are.
“We are still seeing more galaxies than predicted, although none of them are so massive that they ‘break’ the universe,” Chworowsky said.
The evidence was provided by Webb’s Cosmic Evolution Early Release Science (CEERS) Survey, led by Steven Finkelstein, a professor of astronomy at UT Austin and study co-author.
Image A : CEERS Deep Field (NIRCam)
This image shows a small portion of the field observed by NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) for the Cosmic Evolution Early Release Science (CEERS) survey. It is filled with galaxies. Some galaxies appear to have grown so massive, so quickly, that simulations couldn’t account for them. However, a new study finds that some of those early galaxies are in fact much less massive than they first appeared. Black holes in some of those galaxies make them appear much brighter and bigger than they really are. NASA, ESA, CSA, S. Finkelstein (University of Texas)
View 8k pixel full resolution version of the image
Black Holes Add to Brightness
According to this latest study, the galaxies that appeared overly massive likely host black holes rapidly consuming gas. Friction in the fast-moving gas emits heat and light, making these galaxies much brighter than they would be if that light emanated just from stars. This extra light can make it appear that the galaxies contain many more stars, and hence are more massive, than we would otherwise estimate. When scientists remove these galaxies, dubbed “little red dots” (based on their red color and small size), from the analysis, the remaining early galaxies are not too massive to fit within predictions of the standard model.
“So, the bottom line is there is no crisis in terms of the standard model of cosmology,” Finkelstein said. “Any time you have a theory that has stood the test of time for so long, you have to have overwhelming evidence to really throw it out. And that’s simply not the case.”
Efficient Star Factories
Although they’ve settled the main dilemma, a less thorny problem remains: There are still roughly twice as many massive galaxies in Webb’s data of the early universe than expected from the standard model. One possible reason might be that stars formed more quickly in the early universe than they do today.
“Maybe in the early universe, galaxies were better at turning gas into stars,” Chworowsky said.
Star formation happens when hot gas cools enough to succumb to gravity and condense into one or more stars. But as the gas contracts, it heats up, generating outward pressure. In our region of the universe, the balance of these opposing forces tends to make the star formation process very slow. But perhaps, according to some theories, because the early universe was denser than today, it was harder to blow gas out during star formation, allowing the process to go faster.
More Evidence of Black Holes
Concurrently, astronomers have been analyzing the spectra of “little red dots” discovered with Webb, with researchers in both the CEERS team and others finding evidence of fast-moving hydrogen gas, a signature of black hole accretion disks. This supports the idea that at least some of the light coming from these compact, red objects comes from gas swirling around black holes, rather than stars – reinforcing Chworowsky and their team’s conclusion that they are probably not as massive as astronomers initially thought. However, further observations of these intriguing objects are incoming, and should help solve the puzzle about how much light comes from stars versus gas around black holes.
Often in science, when you answer one question, that leads to new questions. While Chworowsky and their colleagues have shown that the standard model of cosmology likely isn’t broken, their work points to the need for new ideas in star formation.
“And so there is still that sense of intrigue,” Chworowsky said. “Not everything is fully understood. That’s what makes doing this kind of science fun, because it’d be a terribly boring field if one paper figured everything out, or there were no more questions to answer.”The James Webb Space Telescope is the world’s premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).
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Media Contacts
Laura Betz – laura.e.betz@nasa.gov, Rob Gutro – rob.gutro@nasa.gov
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Marc Airhart – mairhart@austin.utexas.edu
University of Texas at Austin
Christine Pulliam – cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
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Last Updated Aug 26, 2024 Editor Stephen Sabia Contact Laura Betz laura.e.betz@nasa.gov Related Terms
Astrophysics Galaxies Galaxies, Stars, & Black Holes Galaxies, Stars, & Black Holes Research Goddard Space Flight Center James Webb Space Telescope (JWST) Science & Research The Universe View the full article
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By NASA
2 min read
Hubble Reaches a Lonely Light in the Dark
NASA, ESA, C. Gallart (Instituto de Astrofisica de Canarias), A. del Pino Molina (Centro de Estudios de Fisica del Cosmos de Aragon), and R. van der Marel (Space Telescope Science Institute); Image Processing: Gladys Kober (NASA/Catholic University of America) A splatter of stars glows faintly at almost 3 million light-years away in this new image from NASA’s Hubble Space Telescope. Known as the Tucana Dwarf for lying in the constellation Tucana, this dwarf galaxy contains a loose bundle of aging stars at the far edge of the Local Group, an aggregation of galaxies including our Milky Way, bound together by gravity. The Tucana Dwarf was discovered in 1990 by R.J. Lavery, the same year Hubble launched.
What makes the Tucana Dwarf distinct from other dwarf galaxies comes in two parts: its classification, and its isolation. As a dwarf spheroidal galaxy, it is much smaller and less luminous than most other dwarf galaxies. Dust is sparse and the stellar population skews towards the older range, giving them a dimmer look. Additionally, the Tucana Dwarf lies about 3.6 million light-years from the Local Group’s center of mass, far from the Milky Way and other galaxies. It is only one of two dwarf spheroidal galaxies in the Local Group to be this remote, making astronomers theorize that a close encounter with a larger galactic neighbor called Andromeda slingshotted it into the distance about 11 billion years ago.
Having such pristine properties enables scientists to use the Tucana Dwarf as a cosmic fossil. Dwarf galaxies could be the early ingredients for larger galaxies, and with older stars residing in such an isolated environment, analyzing them can help trace galaxy formation back to the dawn of time. For that reason, Hubble reached far across the Local Group using the capabilities of the Advanced Camera for Surveys and Wide Field and Planetary Camera 2 to meet this distant, lonely galaxy. Examining its structure, composition, and star formation history sheds light on the epoch of reionization, when the first stars and galaxies arose from the dark billions of years ago.
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Last Updated Aug 23, 2024 Editor Michelle Belleville Location NASA Goddard Space Flight Center Related Terms
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By Space Force
History was made on Aug. 16, as six Space Force students out of basic military training became the first Guardians to graduate technical training at the U.S. Air Force Honor Guard at Joint Base Anacostia-Bolling.
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By NASA
A college team dressed in protective clean room suits prepares their robotic rover to compete in the final round of NASA’s annual Lunabotics competition on Thursday, May 16, 2024. Teams score points when their rover completes challenging tasks inside the Artemis Arena – a simulated lunar landscape inside The Astronauts Memorial Foundation’s Center for Space Education at the Kennedy Space Center Visitor Complex in Florida. (Credit: NASA) NASA invites teams from colleges, universities, as well as technical and vocational schools around the country to test their engineering skills in the 2025 Lunabotics Challenge. Applications open at 5 p.m. EDT on Friday, Sept. 6. The competition is aimed at inspiring Artemis Generation students to explore science, technology, engineering, and math (STEM) for the benefit of humanity.
Managed by NASA’s Office of STEM Engagement, the Lunabotics Challenge asks teams to design and build an autonomous or telerobotic robot capable of navigating a simulated lunar surface and completing the assigned construction task. The robots will have to master the complexities of regolith, or lunar soil, simulants used to excavate and construct berm structures in a lunar environment, be capable of operating by remote control or through autonomous operations, and account for weight and size limitations.
By participating in one of NASA’s Artemis Student Challenges, students have the opportunity to provide data on robotic excavator and builder design and operations, helping shape future missions at the Moon and ultimately Mars. NASA encourages creative construction techniques and evaluates student designs and data just like it does for its own prototypes, increasing the chances of finding smart solutions for the challenges the agency may encounter at the Moon under the Artemis campaign.
Additionally, the competition will educate college students in the NASA systems engineering process, the agency’s methodical, multi-disciplinary approach for the design, realization, technical management, operations, and retirement of a system.
The competition will close on Thursday, Sept. 12, and NASA will announce selected teams on Friday, Sept. 20. These teams will put their robots to the test during the University of Central Florida’s Lunabotics Qualification Challenge in May 2025, with the highest scoring teams invited to the culminating event at NASA’s Kennedy Space Center in Florida later that month.
Lunabotics takes place annually, running since 2010, and is one of several Artemis Student Challenges reflecting the goals of the Artemis campaign, which seeks to land the first woman, first person of color, and first international astronaut on the Moon where NASA will establish a long-term presence and prepare for future science and exploration of Mars.
More than 7,000 students have participated in Lunabotics with many former students now working at NASA, or within the aerospace industry.
To learn more about LUNABOTICS, visit:
https://go.nasa.gov/4dcsjVg
–end–
Abbey Donaldson
Headquarters, Washington
202-358-1600
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Derrol Nail
Kennedy Space Center, Florida
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derrol.j.nail@nasa.gov
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By NASA
Manil Maskey (ST11/IMPACT) was an invited panelist at the United States Geospatial Intelligence Foundation (USGIF) organized GEOINT Symposium Panel titled “Geo-GPT” for Real-Time Geospatial Discovery. The panel explored the convergence of foundational artificial intelligence models beyond large language models, unveiling the potential for groundbreaking conversational “GeoGPT” capabilities that enable real-time geospatial discovery. The discussion centered on the fusion of language processing, computer vision, and spatial reasoning to enable dynamic and interactive exploration for GEOINT planning and response missions. The panel highlighted how the integration of diverse AI models can enhance the richness and accuracy of geospatial conversational AI experiences. This allows seamless interactions between humans and machines, empowering users to intuitively engage with real-time maps, interrogate them, and receive insights through natural language dialogue. Maskey shared insights on the NASA Science Mission Directorate’s (SMD’s) activities in the development and use of large language models (LLMs) and foundation models.
The USGIF is an educational foundation dedicated to promoting the geospatial intelligence tradecraft. It aims to develop a stronger GEOINT community by bringing together government, industry, academia, professional organizations, and individuals to address national security challenges through geospatial intelligence. The recording of the panel can be found here. – https://www.youtube.com/watch?v=oHzsIe2Kfmo.
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