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Hubble Helps Determine Uranus’ Rotation Rate with Unprecedented Precision
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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 Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts News Hubble News Social Media Media Resources Multimedia Multimedia Images Videos Sonifications Podcasts e-Books Online Activities Lithographs Fact Sheets Posters Hubble on the NASA App Glossary More 35th Anniversary Online Activities 2 min read
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 up 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 and molecules, 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.
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Last Updated Apr 10, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms
Hubble Space Telescope Astrophysics Astrophysics Division Emission Nebulae Goddard Space Flight Center Nebulae Planetary Nebulae Stars The Universe 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.
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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Have we ever been to Uranus?
The answer is simple, yes, but only once. The Voyager II spacecraft flew by the planet Uranus back in 1986, during a golden era when the Voyager spacecraft explored all four giant planets of our solar system. It revealed an extreme world, a planet that had been bowled over onto its side by some extreme cataclysm early in the formation of the solar system.
That means that its seasons and its magnetic field get exposed to the most dramatic seasonal variability of any place that we know of in the solar system. The atmosphere was a churning system made of methane and hydrogen and water, with methane clouds showing up as white against the bluer background of the planet itself.
The densely packed ring system is host to a number of very fine, narrow and dusty rings surrounded by a collection of icy satellites. And those satellites may harbor deep, dark, hidden oceans beneath an icy crust of water ice.
Taken together, this extreme and exciting system is somewhere that we simply must go back to explore and hopefully in the next one to two decades NASA and the European Space Agency will mount an ambitious mission to go out there and explore the Uranian system. It’s important not just for solar system science, but also for the growing field of exoplanet science. As planets of this particular size, the size of Uranus, about four times wider than planet Earth, seem to be commonplace throughout our galaxy.
So how have we been to Uranus? Yes, but it’s time that we went back.
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Last Updated Apr 10, 2025 Related Terms
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By NASA
Deputy Integration and Testing Manager – Goddard Space Flight Center
Mike Drury began at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, as a temporary technician — a contractor hired for six weeks to set up High Capacity Centrifuge tests. Six weeks then turned into three months and, eventually, over 40 years.
Mike Drury, the deputy integration and testing manager for NASA’s Nancy Grace Roman Space Telescope, stands inside a clean room in front of Roman’s primary support structure and propulsion system. The “bunny suit” that he’s wearing protects the telescope from contaminants like dust, hair, and skin.NASA/Chris Gunn Now, Mike is the deputy integration and testing manager for NASA’s Nancy Grace Roman Space Telescope. In this role, Mike oversees both Roman’s assembly and the many verification processes that ensure it is ready for launch.
“It’s a privilege to work here. There’s really no regrets,” Mike says. “This is a big place, and it is what you make it. You can really spread your wings and go into a lot of different areas and do different things.”
When Mike first began at Goddard, only government-employed technicians could work on space flight hardware. However, times were changing. The “old-timers,” as Mike affectionately calls them, soon began training a small group of contractors, including Mike, for flight hardware work. Mike credits these “old-timers” for the mindset he still carries decades later.
“They taught me how to approach things and execute, and that helped me through my entire career,” Mike says. “It’s that approach — making sure things are done right, without cutting any corners — that I always liked about working here.”
Not everyone can say that they worked on space missions while in college, but Mike can. Mike took advantage of a program through his contract that paid for classes. For 10 years, Mike studied at Anne Arundel Community College while continuing full-time work at Goddard, eventually earning an associate’s degree in mathematics.
While in community college, Mike also stocked up on several physics and calculus credits which helped prepare him to study thermal engineering at Johns Hopkins University. After seven more years of night classes, Mike completed a bachelor’s degree in mechanical engineering.
“Night school was really difficult between full-time work and traveling because I was working on several missions,” Mike says. “You needed that perseverance to just keep going and working away at it. So I just hung in there.”
In this 1989 picture, Mike works on NASA’s BBXRT (Broad Band X-ray Telescope) at NASA’s Kennedy Space Center in Florida. BBXRT flew on the space shuttle Columbia in 1990.NASA In his 17 years of night school, Mike worked on seven missions, expanding his skill set from test set-up, to clean room tech work, to training astronauts. While working on the Hubble Space Telescope, Mike helped to train astronauts for their in-orbit tech work to install various instruments.
“Every mission I’ve worked on I’ve learned something,” Mike says. “Every test you learn more and more about other disciplines.”
After graduating from Johns Hopkins, Mike worked for a short time as an engineer before becoming an integration supervisor. In 2006, Mike took on the position of James Webb Space Telescope ISIM (Integrated Science Instrument Module) integration and test manager. After Webb’s ISIM was integrated with the Optical Telescope Element, Mike became the OTIS (Optical Telescope Element and Integrated Science Instrument Module) integration and testing manager.
“It was a tough eight to 10 years of work,” Mike says. “Loading the OTIS into the shipping container to be sent to NASA’s Johnson Space Center in Houston for further testing was a great accomplishment.”
To ensure that Webb’s ISIM would thrive in space, Mike was involved in more than three months of round-the-clock thermal vacuum testing. During this time, a blizzard stranded Mike and others on-site at Goddard for three days. Mike spent his nights overseeing thermal vacuum tests and his days driving test directors and operators to their nearby hotel rooms with his four-wheel-drive truck — a winter storm savior in short supply.
In this 1992 picture, Mike works alongside another technician on DXS (Diffuse X-Ray Spectrometer) in the shuttle bay at NASA’s Kennedy Space Center in Florida. DXS was a University of Wisconsin-Madison experiment flown during the January 1993 flight of NASA’s Space Shuttle Endeavor.NASA For Mike, the hard work behind space missions is well worth it.
“As humans, we want to discover new things and see things. That’s what keeps me coming back — the thought of discovery and space flight,” Mike says. “I get excited talking to some of the Hubble or Webb scientists about the discoveries they’ve made. They answer questions but they also find themselves asking new ones.”
Some of these new questions opened by Hubble and Webb will be addressed by Mike’s current project — Roman.
“This team I would say is the best I’ve ever worked with. I say that because it’s the Goddard family. Everyone here on Roman has the same agenda, and that’s a successful, on-time launch,” Mike says. “My ultimate goal is to be staying on the beach in Florida after watching Roman blast off. That would be all the icing on the cake.”
Mike is also focusing on laying the groundwork for the next era at Goddard. He works hard to instill a sense of import, intention, and precision in his successors, just as the “old-timers” instilled in him 40 years ago.
“I talk to a lot of my colleagues that I’ve worked with for years, and we’re all excited to hand it off to the next generation,” Mike says. “It’s so exciting to see. I’m the old guy now.”
By Laine Havens
NASA’s Goddard Space Flight Center
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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 Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts News Hubble News Social Media Media Resources Multimedia Multimedia Images Videos Sonifications Podcasts e-Books Online Activities Lithographs Fact Sheets Posters Hubble on the NASA App Glossary More 35th Anniversary Online Activities 2 min read
Hubble Studies a Nearby Galaxy’s Star Formation
This NASA/ESA Hubble Space Telescope image features the picturesque spiral galaxy NGC 4941. ESA/Hubble & NASA, D. Thilker This NASA/ESA Hubble Space Telescope image features the picturesque spiral galaxy NGC 4941, which lies about 67 million light-years from Earth in the constellation Virgo (The Maiden). Because this galaxy is nearby, cosmically speaking, Hubble’s keen instruments are able to pick out exquisite details such as individual star clusters and filamentary clouds of gas and dust.
The data used to construct this image were collected as part of an observing program that investigates the star formation and stellar feedback cycle in nearby galaxies. As stars form in dense, cold clumps of gas, they begin to influence their surroundings. Stars heat and stir up the gas clouds in which they form through winds, starlight, and — eventually, for massive stars — by exploding as supernovae. These processes are collectively called stellar feedback, and they influence the rate at which a galaxy can form new stars.
As it turns out, stars aren’t the only entities providing feedback in NGC 4941. At the heart of this galaxy lies an active galactic nucleus: a supermassive black hole feasting on gas. As the black hole amasses gas from its surroundings, the gas swirls into a superheated disk that glows brightly at wavelengths across the electromagnetic spectrum. Similar to stars — but on a much, much larger scale — active galactic nuclei shape their surroundings through winds, radiation, and powerful jets, altering not only star formation but also the evolution of the galaxy as a whole.
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Claire Andreoli (claire.andreoli@nasa.gov)
NASA’s Goddard Space Flight Center, Greenbelt, MD
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Last Updated Apr 04, 2025 Editor Andrea Gianopoulos Location NASA Goddard Space Flight Center Related Terms
Hubble Space Telescope Astrophysics Astrophysics Division Galaxies Goddard Space Flight Center Spiral Galaxies The Universe 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 Night Sky Challenge
Hubble’s Galaxies
35 Years of Hubble Images
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