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Celebrations held as dome of ESO’s Extremely Large Telescope reaches its peak
ESO’s Extremely Large Telescope (ELT) recently hit an important symbolic milestone: with the structure of one of the dome’s sliding doors now fully installed — and much of the other also up — construction on the ELT dome has reached its highest point. The occasion was celebrated today in Garching, Germany, where ESO hosted an event at its headquarters for industrial and institutional partners, as well as at the construction site atop Cerro Armazones in Chile, in what is known as the Topping Out — or Roofing — Ceremony.
This ceremony, also known as the Tijerales in Chile, featured ESO and Chilean flags being raised atop the telescope dome, and a traditional barbecue for the hardworking people at the construction site. The Tijerales was attended by Governor Ricardo Díaz, representing the Antofagasta Region, where the ELT is located. In Garching, the event featured presentations, networking and a lunch buffet, with several of the industries that have participated in the design, construction and integration of ELT components joining the celebration. A live stream was set up between the two events, allowing teams from both continents to share the success of the ELT’s construction, as the project recently passed the 60% completed milestone.
This transatlantic celebration was attended by many of the people who have been brought together by their work on the ELT. Such an ambitious project has only been made possible through the continued support of ESO Member and Partner States, including the project’s various institutional and industrial partners and the many ESO people involved in making it a reality.
The Topping Out Ceremony is believed to have originated in ancient Scandinavia and takes place on construction sites globally. The Chilean custom includes a flag being placed at the highest point, while in many other countries (including in the German Richtfest), this is replaced by a wreath, tree branches, or evergreen garlands. Despite their differences, most versions of the event include a well-deserved meal for those directly involved in the construction project.
As the world’s largest eye on the sky continues to be built, we look forward to celebrating future milestones on the path to first light. Once operational, ESO’s ELT will observe the cosmos from a unique place on Earth. Thanks to its technological prowess and the pristine dark skies above Armazones, the ELT will revolutionise what we know about our Universe.
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Testing NASA’s IMAP (Interstellar Mapping and Acceleration Probe)
NASA’s IMAP (Interstellar Mapping and Acceleration Probe) is loaded into the X-ray and Cryogenic Facility (XRCF) thermal vacuum chamber at NASA’s Marshall Space Flight Center in Huntsville, Alabama, in this photo from March 20, 2025. There, the spacecraft will undergo testing such as dramatic temperature changes to simulate the harsh environment of space.
The IMAP mission is a modern-day celestial cartographer that will map the solar system by studying the heliosphere, a giant bubble created by the Sun’s solar wind that surrounds our solar system and protects it from harmful interstellar radiation. The IMAP mission will launch on a SpaceX Falcon 9 rocket from NASA’s Kennedy Space Center in Florida, no earlier than September 2025.
Image credit: NASA/Johns Hopkins APL/Princeton/Ed Whitman
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Sculpted by Luminous Stars
This new image, released on April 4, 2025, showcases the dazzling young star cluster NGC 346. Although both the James Webb Space Telescope and the Hubble Space Telescope have released images of NGC 346 previously, this image includes new data and is the first to combine Hubble observations made at infrared, optical, and ultraviolet wavelengths into an intricately detailed view of this vibrant star-forming factory.
Hubble’s exquisite sensitivity and resolution were instrumental in uncovering the secrets of NGC 346’s star formation. Using two sets of observations taken 11 years apart, researchers traced the motions of NGC 346’s stars, revealing them to be spiraling in toward the center of the cluster. This spiraling motion arises from a stream of gas from outside of the cluster that fuels star formation in the center of the turbulent cloud.
Learn more about NGC 346 and the nebula it has shaped.
Image credit: ESA/Hubble and NASA, A. Nota, P. Massey, E. Sabbi, C. Murray, M. Zamani (ESA/Hubble)
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Hubble Captures a Star’s Swan Song
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Hubble Captures a Star’s Swan Song This NASA/ESA Hubble Space Telescope image features the planetary nebula Kohoutek 4-55. ESA/Hubble & NASA, K. Noll
The swirling, paint-like clouds in the darkness of space in this stunning image seem surreal, like a portal to another world opening before us. In fact, the subject of this NASA/ESA Hubble Space Telescope image is very real. We are seeing vast clouds of ionized atoms thrown into space by a dying star. This is a planetary nebula named Kohoutek 4-55, a member of the Milky Way galaxy situated just 4,600 light-years away in the constellation Cygnus (the Swan).
Planetary nebulae are the spectacular final display at the end of a giant star’s life. Once a red giant star has exhausted its available fuel and shed its last layers of gas, its compact core will contract further, enabling a final burst of nuclear fusion. The exposed core reaches extremely hot temperatures, radiating ultraviolet light that energizes the enormous clouds of gas cast off by the star. The ultraviolet light ionizes atoms in the gas, making the clouds glow brightly. In this image, red and orange indicate nitrogen, green is hydrogen, and blue shows oxygen. Kohoutek 4-55 has an uncommon, multi-layered form: a faint layer of gas surrounds a bright inner ring, all wrapped in a broad halo of ionized nitrogen. The spectacle is bittersweet, as the brief phase of fusion in the core will end after only tens of thousands of years, leaving a white dwarf that will never illuminate the clouds around it again.
This image itself was also the final work of one of Hubble’s instruments: the Wide Field and Planetary Camera 2 (WFPC2). Installed in 1993 to replace the original Wide Field and Planetary Camera, WFPC2 was responsible for some of Hubble’s most enduring images and fascinating discoveries. Hubble’s Wide Field Camera 3 replaced WFPC2 in 2009, during Hubble’s final servicing mission. A mere ten days before astronauts removed Hubble’s WFPC2 from the telescope, the instrument collected the data used in this image: a fitting send-off after 16 years of discoveries. Image processors used the latest and most advanced processing techniques to bring the data to life one more time, producing this breathtaking new view of Kohoutek 4-55.
Facebook logo @NASAHubble @NASAHubble Instagram logo @NASAHubble Share Details Last Updated Apr 11, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms- Hubble Space Telescope
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NASA’s Juno Back to Normal Operations After Entering Safe Mode NASA’s Juno flies above Jupiter’s Great Red Spot in this artist’s concept. NASA/JPL-Caltech
The spacecraft was making its 71st close approach to Jupiter when it unexpectedly entered into a precautionary status.
Data received from NASA’s Juno mission indicates the solar-powered spacecraft went into safe mode twice on April 4 while the spacecraft was flying by Jupiter. Safe mode is a precautionary status that a spacecraft enters when it detects an anomaly. Nonessential functions are suspended, and the spacecraft focuses on essential tasks like communication and power management. Upon entering safe mode, Juno’s science instruments were powered down, as designed, for the remainder of the flyby.
The mission operations team has reestablished high-rate data transmission with Juno, and the spacecraft is currently conducting flight software diagnostics.The team will work in the ensuing days to transmit the engineering and science data collected before and after the safe-mode events to Earth.
Juno first entered safe mode at 5:17 a.m. EDT, about an hour before its 71st close passage of Jupiter — called perijove. It went into safe mode again 45 minutes after perijove. During both safe-mode events, the spacecraft performed exactly as designed, rebooting its computer, turning off nonessential functions, and pointing its antenna toward Earth for communication.
Of all the planets in our solar system, Jupiter is home to the most hostile environment, with the radiation belts closest to the planet being the most intense. Early indications suggest the two Perijove 71 safe-mode events occurred as the spacecraft flew through these belts. To block high-energy particles from impacting sensitive electronics and mitigate the harmful effects of the radiation, Juno features a titanium radiation vault.
Including the Perijove 71 events, Juno has unexpectedly entered spacecraft-induced safe mode four times since arriving at Jupiter in July 2016: first, in 2016 during its second orbit, then in 2022 during its 39th orbit. In all four cases, the spacecraft performed as expected and recovered full capability.
Juno’s next perijove will occur on May 7 and include a flyby of the Jovian moon Io at a distance of about 55,300 miles (89,000 kilometers).
More About JunoNASA’s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Juno mission for the principal investigator, Scott Bolton, of the Southwest Research Institute in San Antonio. Juno is part of NASA’s New Frontiers Program, which is managed at NASA’s Marshall Space Flight Center in Huntsville, Alabama, for the agency’s Science Mission Directorate in Washington. The Italian Space Agency (ASI) funded the Jovian InfraRed Auroral Mapper. Lockheed Martin Space in Denver built and operates the spacecraft. Various other institutions around the U.S. provided several of the other scientific instruments on Juno.
More information about Juno is available at:
News Media ContactsDC Agle
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NASA Headquarters, Washington
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Deb Schmid
Southwest Research Institute, San Antonio
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