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By NASA
Explore Hubble Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Hubble and Artificial Intelligence Explore the Night Sky Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts Multimedia Images Videos Sonifications Podcasts e-Books Online Activities 3D Hubble Models Lithographs Fact Sheets Posters Hubble on the NASA App Glossary News Hubble News Social Media Media Resources More 35th Anniversary Online Activities 2 min read
Hubble Observations Give “Missing” Globular Cluster Time to Shine
This NASA Hubble Space Telescope image features a dense and dazzling array of blazing stars that form globular cluster ESO 591-12. NASA, ESA, and D. Massari (INAF — Osservatorio di Astrofisica e Scienza dello Spazio); Processing: Gladys Kober (NASA/Catholic University of America)
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A previously unexplored globular cluster glitters with multicolored stars in this NASA Hubble Space Telescope image. Globular clusters like this one, called ESO 591-12 or Palomar 8, are spherical collections of tens of thousands to millions of stars tightly bound together by gravity. Globular clusters generally form early in the galaxies’ histories in regions rich in gas and dust. Since the stars form from the same cloud of gas as it collapses, they typically hover around the same age. Strewn across this image of ESO 591-12 are a number of red and blue stars. The colors indicate their temperatures; red stars are cooler, while the blue stars are hotter.
Hubble captured the data used to create this image of ESO 591-12 as part of a study intended to resolve individual stars of the entire globular cluster system of the Milky Way. Hubble revolutionized the study of globular clusters since earthbound telescopes are unable to distinguish individual stars in the compact clusters. The study is part of the Hubble Missing Globular Clusters Survey, which targets 34 confirmed Milky Way globular clusters that Hubble has yet to observe.
The program aims to provide complete observations of ages and distances for all of the Milky Way’s globular clusters and investigate fundamental properties of still-unexplored clusters in the galactic bulge or halo. The observations will provide key information on the early stages of our galaxy, when globular clusters formed.
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Hubble’s Star Clusters
Exploring the Birth of Stars
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Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov
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Last Updated Jul 03, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms
Hubble Space Telescope Astrophysics Astrophysics Division Galaxies, Stars, & Black Holes Globular Clusters Goddard Space Flight Center Star Clusters Stars Keep Exploring Discover More Topics From Hubble
Hubble Space Telescope
Since its 1990 launch, the Hubble Space Telescope has changed our fundamental understanding of the universe.
Hubble’s Cosmic Adventure
Hubble’s Night Sky Challenge
Hubble’s 35th Anniversary
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By European Space Agency
On 31 May 2025, the European Space Agency (ESA) made history by transmitting a live performance of The Blue Danube Waltz into space from its Cebreros deep space antenna in Spain. This symbolic gesture elevated Johann Strauss II’s famous waltz, often considered the unofficial ‘anthem of space’, to its rightful place among the stars.
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By European Space Agency
The European Space Agency (ESA) has inaugurated the European Space Deep-Tech Innovation Centre (ESDI), the first ESA presence in Switzerland, created in close collaboration with the Paul Scherrer Institute (PSI). The new centre is located at the Switzerland Innovation Park Innovaare in Villigen. The opening highlights the growing role of deep tech in space exploration and its potential to boost Europe's growth and competitiveness.
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By NASA
During World Water Day at Great Lakes Science Center in Cleveland on Friday, March 21, 2025, NASA’s Glenn Research Center staff, left to right, Heather Roe, Debbie Welch, and Jacqueline Minerd show how NASA’s Liquid Cooling and Ventilation Garment uses water to regulate the body temperatures of astronauts during spacewalks. Credit: NASA/Lillianne Hammel Water is essential for life, and it is an important engineering tool as well. On March 21, NASA’s Glenn Research Center staff joined Great Lakes Science Center in celebrating World Water Day at the science center, home of the NASA Glenn Visitor Center, in downtown Cleveland. Staff conducted hands-on demonstrations highlighting NASA’s Liquid Cooling and Ventilation Garment during the free day for students.
A NASA Glenn Research Center staff member demonstrates how NASA’s Liquid Cooling and Ventilation Garment cools down the body using water during World Water Day at Great Lakes Science Center in Cleveland on Friday, March 21, 2025. Credit: NASA/Lillianne Hammel This interactive activity helped students discover how NASA uses water to regulate the body temperatures of astronauts during spacewalks.
Approximately 450 students and educators attended the event.
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By NASA
Dave Gallagher will become the director of NASA’s Jet Propulsion Laboratory in Southern California on Sunday, June 1. NASA/JPL-Caltech Laurie Leshin has decided to step down as director of NASA’s Jet Propulsion Laboratory on Sunday, June 1. David Gallagher, who has been serving as the Lab’s associate director for Strategic Integration, has been selected by Caltech to lead the federally funded research and development center. Caltech manages JPL for NASA.
A distinguished geochemist, Leshin was named by Caltech to lead the lab in early 2022. Her career has spanned academia and senior positions at NASA. Several NASA missions managed by JPL have launched under her leadership, including EMIT, SWOT, Psyche, PREFIRE, Europa Clipper, and SPHEREx, with the NASA-Indian Earth satellite NISAR set for a June launch. In addition, JPL has advanced the development of NASA’s asteroid-hunting NEO Surveyor mission as well as the trio of CADRE lunar rovers, and it delivered the Coronagraph Instrument, a technology demonstration with NASA’s forthcoming Roman Space Telescope.
“I am proud of the many things JPL has accomplished over the past three years,” said Leshin. “In addition to the long list of missions that have launched or moved toward launch during that time, we saved Voyager more than once and flew into history on Mars with Ingenuity. We have made more amazing scientific discoveries than I can name, including finding potential ancient Martian biomarkers with Perseverance. And we’ve driven the forefront of technology on Earth and in space. I know those achievements will continue under Dave’s capable leadership.”
Leshin, who has also served as Caltech vice president, is stepping down for personal reasons and will remain a Bren Professor of Geochemistry and Planetary Science at Caltech.
“While we respect Laurie’s decision to step away from her leadership position at JPL, we will miss her drive, compassion, and dedication,” Caltech President Thomas Rosenbaum said. “At the same time, we are grateful to Dave Gallagher for his devotion to JPL and his continuing leadership and partnership going forward. Dave’s experience working across multiple government and private sector entities will help secure ongoing support for America’s agenda in space, with JPL continuing to play an essential role.”
Gallagher will draw on his deep experience at JPL to lead the lab into the future. He arrived at JPL 36 years ago, in 1989, and went on to hold numerous leadership positions. Along with having served as the director and deputy director for Astronomy, Physics, and Space Technology, he was manager of JPL’s Advanced Optical Systems Program Office. An electrical engineer, Gallagher also managed the Spitzer Space Telescope and, among other roles, led the team that built and tested the Wide Field/Planetary Camera 2 (WF/PC-2) — a critical instrument that corrected the spherical aberration on NASA’s Hubble Space Telescope.
“Laurie has made a significant impact on energizing and focusing the lab, guiding it back on track after the Covid-19 pandemic. I wish her great success in this next chapter of her career, and I look forward to a very smooth transition at the lab,” said Gallagher. “We have exciting opportunities ahead helping to advance our nation’s space agenda and a fantastic team to help realize them.”
Founded by Caltech faculty and students in 1936, JPL has been managed by Caltech on behalf of NASA since 1958.
News Media Contacts
Matthew Segal / Veronica McGregor
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-8307 / 818-354-9452
matthew.j.segal@jpl.nasa.gov / veronica.c.mcgregor@jpl.nasa.gov
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