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Researchers using two of humanity’s most powerful observatories — NASA’s James Webb and Hubble Space Telescopes — have definitively shown that Terzan 5 is not a globular star cluster as it was once classified, offering new insight into how galaxies like our own form and evolve over time. A globular star cluster typically has only one ancient star population. New data not only confirms the existence of two distinct populations of stars in Terzan 5, but also provides evidence for two more recent rounds of star formation. Although located within the crowded bulge of our Milky Way, our galaxy’s central, spherical region of older stars, Terzan 5 was massive enough to maintain its separate identity while lighter weight systems spread out and mixed to form the bulge billions of years ago. It’s like a lump in an otherwise well-mixed cake batter.

“Webb’s new near-infrared observations, cross-referenced with Hubble’s archival observations, have given us a much clearer picture of the history of Terzan 5,” said Giorgia Zullo, who led the research and is a PhD student at the University of Bologna in Italy.

These results were presented at a press conference Tuesday at the 248th meeting of the American Astronomical Society in Pasadena, and were published in Astronomy & Astrophysics.

Image: Bulge Fossil Fragment Terzan 5 (Webb and Hubble Image)

Four generations of stars

Discovered in 1968 by astronomer Azop Terzan, Terzan 5 resembles a globular cluster in many ways. However, in 2009 this system was discovered to harbor two distinct populations of stars. In 2016 Hubble provided the first estimate of their ages, showing that one formed roughly 12 billion years ago — as the Milky Way itself was assembling — and the other about 5 billion years ago, just before Earth started forming. This pointed to a more complex history than a typical globular cluster.

Studying Terzan 5 is complicated by its location in a region of our galaxy crowded with stars and heavily obscured by dust. This is where Webb stepped in. Its infrared view allowed the research team to peer through the dust and catalog many more stars, and fainter stars, than previous work. By measuring star colors and brightnesses, astronomers can classify them into populations of different ages and chemistries.

Webb was able to measure these key properties for every star within the field of view in the sky — both stars within Terzan 5 and unrelated foreground stars. To isolate the stars of Terzan 5, the team relied on the power and longevity of Hubble. The 12-year separation allowed the team to measure very small movements of individual stars, known as proper motions, to determine which stars belong to Terzan 5 and which are part of the Milky Way bulge.

By combining data from both Webb and Hubble, the researchers found strong evidence for two more stellar populations, one that formed 3.8 billion years ago and another only 2.5 billion years ago. They also were able to determine the ages of the previously known stellar populations with unprecedented precision, finding that they formed 12.5 billion and 4.7 billion years ago.

With the previously known two generations of stars, astronomers could not rule out the possibility that Terzan 5 interacted with another object, like a globular cluster or a giant molecular cloud, becoming enriched with new gas and dust that set off a second round of star formation. With four stellar generations, those explanations are ruled out.

Measurements of the stellar composition of Terzan 5 populations made at the W. M. Keck Observatory and European Southern Observatory’s Very Large Telescope also point toward very distinct populations. “Along with the ages of these populations, the cluster preserves a fossil record of progressive enrichment of heavy elements by supernovae,” said co-author R. Michael Rich, a research astronomer at the University of California, Los Angeles.

Terzan 5 formed multiple generations of stars because it was able to retain the necessary raw materials. There is evidence of powerful supernova explosions in Terzan 5 that forged heavier elements that were swept up by subsequent generations of stars. In lighter weight systems, the force of the explosions themselves could have ejected the resulting elements as well as sweeping out leftover gas and dust. The progenitor of Terzan 5 had enough mass to retain those stars’ ejections, allowing new generations of stars to form over billions of years.

‘Bulge fossil fragment’

The results show that Terzan 5 is most likely the remnant of a much more massive stellar system that initially formed 12.5 billion years ago. Terzan 5 is extraordinary because it survived — and never merged or fully “mixed in” with the Milky Way’s bulge. “For some reason, this peculiar clump of stars formed separately from the bulge and was not destroyed as the bulge itself formed,” said Francesco R. Ferraro, a professor at the University of Bologna and principal investigator of the Webb observations. “Terzan 5 is what we now call a bulge fossil fragment because it resembles the primordial clumps that contributed to the formation of the bulge.”

To date, there’s one other known cosmic object like Terzan 5. Liller 1 was the second to be reclassified from a globular star cluster to a bulge fossil fragment. It also contains multiple generations of stars. There may be more objects like it. Between 40 to 50 additional globular clusters that orbit within the bulge will be examined by Ferraro’s team to determine if their stellar populations are all the same, like globular clusters, or have several generations, like bulge fossil fragments. 

Video: Zoom to See Terzan 5 Near Our Milky Way Galaxy’s Bulge

Potential parallels for galaxy formation near, far

Ultimately, this research may improve what we know about how the central bulges of galaxies form over hundreds of millions of years. “Based on observations and in-depth simulations, we think that galaxies in the early universe had huge disks of gas that fragmented into clumps and formed stars. These clumps migrated to the center of the galaxies, and many merged to form their bulges,” said Barbara Lanzoni, a co-author and associate professor at the University of Bologna. For example, Webb has turned up several examples of “clumpy” galaxies that were actively forming when the universe was only a few hundred million years old, like the clumps in the Firefly Sparkle galaxy. “Terzan 5 may provide direct evidence that can help explain how bulges formed in galaxies throughout the universe,” Lanzoni said.

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).

The Hubble Space Telescope has been operating for over three decades and continues to make ground-breaking discoveries that shape our fundamental understanding of the universe. Hubble is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope and mission operations. Lockheed Martin Space, based in Denver, also supports mission operations at Goddard. The Space Telescope Science Institute in Baltimore, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.

To learn more about Webb, visit:

https://science.nasa.gov/webb

To learn more about Hubble, visit:

https://science.nasa.gov/hubble

Downloads & Related Information

The following sections contain links to download this article’s images and videos in all available resolutions followed by related information links, media contacts, and if available, research paper and Spanish translation links.

Related Links

Read more: Hubble’s star clusters

Explore more: ViewSpace | Forms of light: the Cluster Omega Centauri

Watch: Globular Clusters, Stellar Pockets

Watch: Sorting the Stars in Omega Centauri

Webb: News | Images | Science | Home Page

Hubble: News | Images | Science | Home Page

Astronauts aboard the International Space Station have switched on NASA’s newly upgraded Cold Atom Lab, a one-of-a-kind facility designed to improve how scientists explore the fundamental workings of matter and develop new quantum technologies. By leveraging the unique environment of microgravity in space, the lab can accomplish cutting-edge science impossible to do anywhere else.

Quantum science is the study of matter at the smallest scales, like atoms, electrons, and single particles of light. While it’s easy to imagine atoms as billiard balls bouncing off one another, they also exhibit wave-like behavior, can exist simultaneously in two places at once, and may even pass through one another.

About the size of a minifridge and operated from Earth, the Cold Atom Lab chills atoms to temperatures below minus 459 degrees Fahrenheit (minus 237 degrees Celsius). At this extreme cold, just above absolute zero, atoms form a large quantum object called a Bose‑Einstein condensate, or BEC, a collection of matter waves that is a fifth state of matter beyond solids, liquids, gases, and plasma. This object follows the rules of quantum mechanics despite being much larger than subatomic particles, and the microgravity of low Earth orbit helps make the waves even larger.

“At the coldest temperatures, matter behaves drastically different from anything we have experienced,” said Jason Williams, project scientist for Cold Atom Lab at NASA’s Jet Propulsion Laboratory in Southern California, which built the facility. “The wavelike nature of matter dominates, and ultracold matter can behave in ways that are not only unexpected, but that also enable extremely precise measurements of time, gravity, and motion. The lab has lots of tools — especially with this latest upgrade — to let us probe the nature of the universe.”

The project supports five international teams studying fundamental physics. It also tests the space-readiness of quantum tools that could support future Earth science and space exploration missions.

How it works

The heart of the Cold Atom Lab is a complex set of instruments called its science module. An upgraded module launched on April 11 as part of a Commercial Resupply Services mission to the space station, enabling new kinds of experiments.

For each experiment, a strip of rubidium or potassium metal is heated to as high as 750 F (400 C) — hot enough to form a gas within the facility’s vacuum chamber. Lasers tuned to specific frequencies are then fired at the gas, draining the energy from these atoms, and cooling them by slowing them down. Once this gas has completed the laser-cooling stage, a magnetic trap captures and holds the gas in place. Through a series of complex techniques, the laboratory reduces an atom cloud’s energy further, bringing it close to a standstill and maximizing its time in microgravity.

While facilities for studying ultracold gases exist on Earth, the Cold Atom Lab can study quantum gases in microgravity for longer periods of time and at even lower temperatures. Conducting these experiments in low gravity allows scientists to study larger quantum waves that also interact for longer times with gravity. To harness these benefits, the Cold Atom Lab essentially shrinks an atom physics lab, typically the size of an entire room filled with lasers and tabletop mirrors, to fit within an experiment rack aboard the space station.

“As the first project to create Bose-Einstein condensates in orbit, we’re demonstrating that we can make quantum technology work reliably in space,” said Ethan Elliott, deputy project scientist for Cold Atom Lab at JPL. “In the previous century, there was a quantum revolution that led to lasers, cellphones, and MRIs for medical imaging. We’re performing quantum 2.0 — direct manipulation of large quantum states — and we hope for similar gains in quantum tech by advancing this science in orbit.”

The latest upgrade is the fourth since the Cold Atom Lab arrived at the space station in 2018. Key improvements include a newly designed magnetic trap that changes the shape of the quantum gas clouds, allowing scientists to test different properties related to their atoms. The upgrade also features redesigned metal strips that act as sources for those gas clouds.

“It’s the closest thing we have to controlling the boundary of the quantum world,” said Kamal Oudrhiri, project manager of Cold Atom Lab at JPL, referring to those low temperatures. “This new upgrade pushes that boundary even further.”

The upgrade, Oudrhiri added, “demonstrates NASA’s ability to maintain U.S. leadership in space-based quantum technologies while maturing future quantum instruments, such as matter-wave interferometers for fundamental physics missions, positioning, navigation, timing, and gravity sensing of Earth, the Moon, and beyond.”

More about Cold Atom Lab

Managed by Caltech in Pasadena, JPL designed, built, and operates the Cold Atom Lab, which is sponsored by the Biological and Physical Sciences division of NASA’s Science Mission Directorate at the agency’s headquarters in Washington. The division pioneers scientific discovery and enables exploration by using space environments to conduct investigations that are not possible on Earth. Studying biological and physical phenomena under extreme conditions allows researchers to advance the fundamental scientific knowledge required to go farther and stay longer in space, while also benefiting life on Earth. 

To learn more about Cold Atom Lab, visit:

https://nasa.gov/cold-atom-laboratory/

Media Contact

Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433
andrew.c.good@jpl.nasa.gov

2026-039

The Transient Artifact and Continuous Learning System (TACLS) leverages data from continuously operating satellite networks coupled with machine learning models to help meteorologists at the National Weather Service forecast flash floods more efficiently. This new software is the result of a collaboration between NASA’s Jet Propulsion Laboratory, the University of California, San Diego (UCSD), and the National Oceanic and Atmospheric Administration (NOAA) National Weather Service (NWS).

Created with support from NASA’s Earth Science Technology Office (ESTO), TACLS leverages machine learning to automatically locate evidence (unusual increases in atmospheric moisture) of impending flash flooding that meteorologists may otherwise miss as they analyze large amounts of data. TACLS flags that evidence, indicates where flash flooding could likely occur, and displays that information via a user-friendly visualization for human analysts to interpret. Those analysts can then decide whether to issue a flash flood warning or weather advisory.

This novel framework for tracking extreme weather events and predicting imminent flash floods operates in near real-time, producing forecasts in as little as fifteen minutes.

“That’s really what we wanted to do, to give meteorologists a tool to help decision making for flash flood warnings,” said Yehuda Bock, Distinguished Researcher at the UCSD Scripps Institution of Oceanography and principal investigator for TACLS.

In simulations testing, TACLS used data from diverse severe weather events—including atmospheric rivers, monsoonal convection, and tropical cyclone remnants—between 2017 and 2023 and successfully captured 93% of the issued flash-flood warnings. Meteorologists from the National Weather Service are currently working to incorporate TACLS into their existing systems for forecasting flash floods in Southern California.

This learning system has two main components. First, an analytic back-end software suite uses machine learning algorithms to process satellite data and determine areas at risk for flooding. Second, user-friendly visualization software highlights those areas for further analysis by humans.

The ACLS back-end software analyzes data from satellites in the Global Navigation Satellite System (GNSS), a constellation of satellite networks that drive navigation services around the world. Water vapor in the troposphere delays signals from these satellites as they travel to Earth. This signal delay can be analyzed to calculate the amount of water vapor in the atmosphere over a particular location on Earth.

The TACLS analytic back-end software suite features a machine learning model trained using more than 30 years of past GNSS data. This model is an anomaly detector that tracks unusual increases in atmospheric moisture. The model then carefully examines that atmospheric moisture data and determines whether it’s either an artifact (a false feature or distortion in the data) or a transient (a time-sensitive physical event, like heavy precipitation) that requires interpretation by human analysts.

If TACLS determines the data represents a transient, such as an extreme weather event that warrants a flash flood warning, it will forward that data to the TACLS visualization software (MGViz) for further evaluation by humans. The analysts use their judgement and experience to interpret these events and determine whether the flagged data indicates a flash flood is likely, and, if necessary, issue a flash flood warning.

Several past innovations developed at JPL are leveraged by TACLS to process GNSS data and present the results. The analytic back-end software suite incorporates elements from JPL’s Domain-agnostic Outlier Ranking Algorithms program and the Time-series Forecasting, Evaluation, and Deployment program. The TACLS visualizer is based on the Multi-Mission Geographic Information System, originally developed at JPL for NASA’s Mars missions.

The TACLS software binds all these components within a novel system that enhances existing methods to reduce the amount of time it takes for a human analyst to determine whether to issue a flash flood warning.

Both the TACLS software and the data used to train it will be open-source, allowing scientists to either tailor this model in response to their unique research needs or create their own model from scratch.

For additional details, see the entry for this project on NASA TechPort. 

Project Lead: Dr. Yehuda Bock, University of California, San Diego. 

Sponsoring Organization(s): NASA’s Earth Science Technology Office Advanced Information Systems Technology Program; JPL; NOAA; National Weather Service. 

NASA’s Center of Excellence for Collaborative Innovation (CoECI) assists in the use of crowdsourcing across the federal government. CoECI’s NASA Tournament Lab offers the contract capability to run external crowdsourced challenges on behalf of NASA and other agencies.

Sponsored by the Administration for Strategic Preparedness and Response (ASPR), a division of the U.S. Department of Health and Human Services (HHS), this prize competition seeks forward-thinking solutions to strengthen the nation’s ability to rapidly produce and distribute critical medical supplies during public health emergencies and supply chain disruptions. Through three challenge phases, participants will develop an innovative conceptual systems design using technologies and frameworks that advance the future of resilient medical manufacturing, logistics, and digital coordination capabilities.

Phase 1: Participants will submit:

• 8-page submission paper
• 3-minute Pitch video
• Blueprint supporting the key capabilities and structure of the solution

Submissions will be evaluated per challenge Judging Criteria. Following the Judge evaluation period, up to 8 Finalists will receive a $5,000 prize each and be invited to the hybrid (in-person and virtual) Pitch Event at ASPR headquarters in Washington, DC. Up to 3 Winners from the Pitch Event will receive a $150,000 prize each and be invited to the innovation development phase.

Phase 2: Two developmental milestones will monitor solution development and will include $75,000 additional prizes for each milestone complete (up to $150,000 in total milestone prize payments).

Phase 3: At the end of the development milestone period, up to 3 teams may be invited to the final Live Validation Event to test their solution under applicable real-world simulations and compete for a total prize purse up to $1,100,000.

‍Total Prizes: Up to $2.04 Million

Challenge Launch: June 15, 2026

Phase 1 Submissions Due: August 28, 2026

For more information, visit: https://www.expeditionhacks.com/challenges/digital-stockpile-challenge

Services Catalog

Click here to view the FY26 Services Catalog

The catalogs provide service description, chargeback rate, unit of measure, and service level indicators for each NSSC service.

Service Level Agreement (SLA)

Click here to view the Service Level Agreement

The SLA provides information about roles, responsibilities, rates, and service level indicators for all NASA Centers. The SLA is negotiated on an annual basis in line with the fiscal year. A single SLA is shared by all NASA Centers and signed by the Associate Administrator, Chief Financial Officer, Chief Information Officer, and the Office of Inspector General. The SLA provides for the delivery of specific services from the NSSC to NASA Centers and Headquarters Operations in the areas of:

• Financial Management
• Procurement
• Human Resources
• Information Technology
• Agency Business Services

NSSC Bill (Formerly know as Performance and Utilization Report (PUR))

*** On-Line Course Management and Training Purchases have been realigned to the OLC &Training Purchases section of the bill in accordance with the realignment of training funds. Center Special Projects have been consolidated into one Special Projects bill with the funding Center identified for each project.***

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Qualcomm CEO Cristiano Amon said Tuesday that the company is working on over 40 different AI wearable devices — including jewelry, earbuds with cameras, pins, and watches — a sign of how aggressively the chipmaker is betting that the next major computing platform won't be a phone.

A security researcher said a flaw in FIFA’s online platforms allowed her to access several internal systems, including one that could have allowed her to take control of the TV stream of every World Cup match.

Google has released Android 17 and Wear OS 7, introducing new multitasking features, parental controls, security tools, and smartwatch upgrades. The launch is also accompanied by a Pixel Drop that brings Google’s latest AI models to its devices.

Mobileye apparently wants to own some of the robotaxi market, even if that puts it in direct competition with companies it supplies its self-driving system to.

The company said the cuts were part of a restructuring meant to help scale to profitability. Rivian recently pushed back its profitability goal to invest in autonomy.