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By NASA
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Preparations for Next Moonwalk Simulations Underway (and Underwater)
Note: The following article is part of a series highlighting propulsion testing at NASA’s Stennis Space Center. To access the entire series, please visit: https://www.nasa.gov/feature/propulsion-powering-space-dreams/.
Workers making way for NASA’s Stennis Space Center near Bay St. Louis, Mississippi, likely did not realize they were building something that would not only withstand the test of time but transcend it.
Mosquitoes, snakes, hurricanes, and intense south Mississippi heat – early crews faced all with a spirit of resilience and adaptability that remains a hallmark characteristic of NASA Stennis six decades later.
“From going to the Moon for the first time and now returning to the Moon, you can trace a straight line of propulsion testing at NASA Stennis,” said Maury Vander, chief of the NASA Stennis Test Operations Division. “We still stand on the front lines of support for this country’s space program.”
For five decades and counting, the versatile NASA Stennis test stands have been used for stage, engine, and component testing on multiple NASA and commercial projects.
A Sept. 25, 2012, aerial image shows the three propulsion test areas at NASA’s Stennis Space Center – the E Test Complex (with 12 active test cell positions capable of component, engine, and stage test activities) in the foreground, the A Test Complex (featuring the Fred Haise, A-2, and A-3 stands for large engine testing) in the middle, and the Thad Cochran Test Stand (B-1/B-2) that can support both engine and stage testing in the background.NASA/Stennis The Fred Haise Test Stand (formerly the A-1 Test Stand), pictured on Oct. 6, 2020, at NASA’s Stennis Space Center, tests RS-25 flight engines to help power NASA’s powerful SLS (Space Launch System). NOTE: Right click on photo to open full image in new tab.NASA/Stennis An image shows the A-2 Test Stand at NASA’s Stennis Space Center – then-Mississippi Test Facility – on April 17, 1966. Less than a week later, south Mississippi would be fully ushered into the Apollo era with the site’s first-ever hot fire test. NOTE: Right click on photo to open full image in new tab.NASA/Stennis An image shows the A-3 Test Stand at NASA’s Stennis Space Center on March 29, 2013. The test stand area now is under lease to Rocket Lab for commercial operations. NOTE: Right click on photo to open full image in new tab.NASA/Stennis An image shows the Thad Cochran Test Stand (B-1/B-2) at NASA’s Stennis Space Center on Dec. 31, 2014, during buildout for testing the core stage of NASA’s SLS (Space Launch System) rocket. NASA/Stennis An aerial image shows the Thad Cochran Test Stand (B-1/B-2) at NASA’s Stennis Space Center on Feb. 22, 2017, following core stage buildout of the test stand for future SLS (Space Launch System) testing. NASA/Stennis Three NASA Stennis stands – Fred Haise (formerly the A-1 Test Stand), A-2, and Thad Cochran (B-1/B-2) – date to the 1960s, when they were built to test Saturn V rocket stages for Apollo missions to the Moon. The Fred Haise and A-2 stand were single-position stands for testing one Saturn V second stage at a time. The Thad Cochran featured two positions – (B-1 and B-2) – that could each house a Saturn V first stage, although only the B-2 position was used during Apollo testing.
When the Apollo Program ended, the Fred Haise, A-2, and Thad Cochran (B-1) stands were modified to test single engines rather than rocket stages. All three were used in subsequent years to test space shuttle main engines and others.
Meanwhile, the Thad Cochran (B-2) stand was maintained for full stage testing. The space shuttle Main Propulsion Test Article was tested on the stand, as was the Common Core Booster for the Delta IV rocket. Most recently, the stand was used to test the first SLS (Space Launch System) stage that helped launch the Artemis I mission in 2022.
In 2024, the Fred Haise Test Stand is dedicated to RS-25 engine testing for NASA’s Artemis initiative. Every RS-25 engine that will help launch an SLS rocket during Artemis will be tested on the stand. The A-2 stand has been leased to Relativity Space, which is modifying it to support stage testing for its new rocket. In 2023, the Thad Cochran (B-1) stand concluded more than 20 years of RS-68 testing for Aerojet Rocketdyne (now known as L3Harris) and now is open for commercial use. The Thad Cochran (B-2) stand is being prepared to test NASA’s new SLS exploration upper stage before it flies on a future Artemis mission.
“When you think about the work at NASA Stennis, this is a place that helps write history,” Vander said. “And in a sense, these test stands are timeless, still operating as designed 60 years after they were built, so there is more history yet to come.”
NASA Stennis also constructed a fourth large test structure in the 2010s. The A-3 Test Stand is uniquely designed to simulate high altitudes up to 100,000 feet for testing engines and stages that need to fire in space. Rocket Lab currently leases the A-3 Test Stand area for construction of its Archimedes Test Complex.
Crews deliver the first RS-25 flight engine, engine No. 2059, to the Fred Haise Test Stand (formerly the A-1 Test Stand) at NASA’s Stennis Space Center on Nov. 4, 2015. The engine was tested to certify it for use on NASA’s powerful SLS (Space Launch System) rocket. NASA/Stennis An image shows a space shuttle main engine test on the A-2 Test Stand at NASA’s Stennis Space Center on July 21, 2003. NASA/Stennis The A-3 Test Stand, designed to test fire next-generation engines at simulated altitudes up to 100,000 feet, undergoes an activation test on Feb. 24, 2014.NASA/Stennis NASA Stennis also operates a smaller test area to conduct component, subsystem, and system level testing. The area is now known as the E Test Complex and features four facilities, all developed from the late 1980s to the early 1990s.
Construction of the E-1 Test Stand, then known as the Component Test Facility, began to support a joint project involving NASA and the U.S. Air Force project. Although the project was canceled, a second joint endeavor allowed completion of the test facility.
Development of the E-2 Test Stand, originally known as the High Heat Flux Facility, began to support the National Aerospace Plane project. Following cancelation of the project, the facility was completed to support testing for component and engine development efforts.
An E-3 Test Facility was constructed to support various component and small/subscale engine and booster test projects. Relativity Space leased a partially developed E-4 test area in 2018 and has since completed construction to support its commercial testing.
All in all, the E Test Complex stands feature 12 active cells capable of various component and engine testing. The versatility of the complex infrastructure and test team allows it to support test projects for a range of commercial aerospace companies, large and small. Currently, both E-2 cells 1 and 2 are leased to Relativity Space through 2028.
An aerial image shows the E-1 Test Stand at NASA’s Stennis Space Center on May 19, 2015. The versatile four-stand E Test Complex includes 12 active test cell positions capable of various component, engine, and stage test activities. NASA/Stennis An aerial image shows the E-3 test area at NASA’s Stennis Space Center on May 19, 2015. The versatile four-stand E Test Complex includes 12 active test cell positions capable of various component, engine, and stage test activities. NASA/Stennis An aerial image shows the E-2 Test Stand (Cell 1) at NASA’s Stennis Space Center on May 19, 2015. The versatile four-stand E Test Complex includes 12 active test cell positions capable of various component, engine, and stage test activities. NASA/Stennis “These facilities really do not exist anywhere else in the United States,” said Kevin Power, assistant director, Office of Project Management in the NASA Stennis Engineering and Test Directorate. “Customers come to us with requirements for certain tests of an article, and we look at what is the best place to test it based on the facility infrastructure. We have completed component level testing, all the way up to full engines.”
The list of companies who have conducted – or are now conducting – propulsion projects in the E Test Complex reads like a who’s who of commercial aerospace leaders.
“The E Complex illustrates the NASA Stennis story,” Power said. “We have very valuable infrastructure and resources, chief of which is the test team, who adapt to benefit NASA and meet the needs of the growing commercial aerospace industry.”
For information about NASA’s Stennis Space Center, visit:
Stennis Space Center – NASA
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Last Updated Nov 13, 2024 EditorNASA Stennis CommunicationsContactC. Lacy Thompsoncalvin.l.thompson@nasa.gov / (228) 688-3333LocationStennis Space Center Related Terms
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By European Space Agency
A new European Space Agency-backed study shows that the extreme heatwaves of 2023, which fuelled huge wildfires and severe droughts, also undermined the land’s capacity to soak up atmospheric carbon. This diminished carbon uptake drove atmospheric carbon dioxide levels to new highs, intensifying concerns about accelerating climate change.
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By NASA
Twelve-year-old, Aadya Karthik of Seattle, Washington; nine-year-old, Rainie Lin of Lexington, Kentucky; and eighteen-year-old, Thomas Lui, winners of the 2023-2024 Power to Explore Student Writing Challenge observe testing at a NASA Glenn cleanroom during their prize trip to Cleveland. Credit: NASA NASA’s fourth annual Power to Explore Student Challenge kicked off November 7, 2024. The science, engineering, technology, and mathematics (STEM) writing challenge invites kindergarten through 12th grade students in the United States to learn about radioisotope power systems, a type of nuclear battery integral to many of NASA’s far-reaching space missions.
Students are invited to write an essay about a new nuclear-powered mission to any moon in the solar system they choose. Submissions are due Jan. 31, 2025.
With freezing temperatures, long nights, and deep craters that never see sunlight on many of these moons, including our own, missions to them could use a special kind of power: radioisotope power systems. These power systems have helped NASA explore the harshest, darkest, and dustiest parts of our solar system and enabled spacecraft to study its many moons.
“Sending spacecraft into space is hard, and it’s even harder sending them to the extreme environments surrounding the diverse moons in our solar system,” said Nicola Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington. “NASA’s Power to Explore Student Challenge provides the incredible opportunity for our next generation – our future explorers – to design their own daring missions using science, technology, engineering, and mathematics to explore space and discover new science for the benefit of all, while also revealing incredible creative power within themselves. We cannot wait to see what the students dream up!”
Entries should detail where students would go, what they would explore, and how they would use radioisotope power systems to achieve mission success in a dusty, dark, or far away moon destination.
Judges will review entries in three grade-level categories: K-4, 5-8, and 9-12. Student entries are limited to 275 words and should address the mission destination, mission goals, and describe one of the student’s unique powers that will help the mission.
One grand prize winner from each grade category will receive a trip for two to NASA’s Glenn Research Center in Cleveland to learn about the people and technologies that enable NASA missions. Every student who submits an entry will receive a digital certificate and an invitation to a virtual event with NASA experts where they’ll learn about what powers the NASA workforce to dream big and explore.
Judges Needed
NASA and Future Engineers are seeking volunteers to help judge the thousands of contest entries anticipated submitted from around the country. Interested U.S. residents older than 18 can offer to volunteer approximately three hours to review submissions should register to judge at the Future Engineers website.
The Power to Explore Student Challenge is funded by the NASA Science Mission Directorate’s Radioisotope Power Systems Program Office and managed and administered by Future Engineers under the direction of the NASA Tournament Lab, a part of the Prizes, Challenges, and Crowdsourcing Program in NASA’s Space Technology Mission Directorate.
To learn more about the challenge, visit:
https://www.nasa.gov/power-to-explore
-end-
Karen Fox / Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
Kristin Jansen
Glenn Research Center, Cleveland
216-296-2203
kristin.m.jansen@nasa.gov
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Last Updated Nov 07, 2024 LocationNASA Headquarters Related Terms
Opportunities For Students to Get Involved Science Mission Directorate STEM Engagement at NASA View the full article
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By NASA
Radioisotope Power Systems RPS Home About About RPS About the Program About Plutonium-238 Safety and Reliability For Mission Planners Contact Systems Overview Power Systems Thermal Systems Dynamic Radioisotope Power Missions Overview Timeline News Resources STEM Overview Power to Explore Contest Kid-Friendly Videos FAQ 5 Min Read After 60 Years, Nuclear Power for Spaceflight is Still Tried and True
Workers install one of three Radioisotope Thermoelectric Generators (RTGs) on the Cassini spacecraft. More › Credits:
NASA Editor’s Note: Originally published on June 21, 2021.
Six decades after the launch of the first nuclear-powered space mission, Transit IV-A, NASA is embarking on a bold future of human exploration and scientific discovery. This future builds on a proud history of safely launching and operating nuclear-powered missions in space.
“Nuclear power has opened the solar system to exploration, allowing us to observe and understand dark, distant planetary bodies that would otherwise be unreachable. And we’re just getting started,” said Dr. Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate. “Future nuclear power and propulsion systems will help revolutionize our understanding of the solar system and beyond and play a crucial role in enabling long-term human missions to the Moon and Mars.”
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Space nuclear power to explore the deepest, dustiest, darkest, and most distant regions of our solar system and beyond. NASA From Humble Beginnings: Nuclear Power Spawns an Age of Scientific Discovery
On June 29, 1961, the John’s Hopkins University Applied Physics Laboratory launched the Transit IV-A Spacecraft. It was a U.S. Navy navigational satellite with a SNAP-3B radioisotope powered generator producing 2.7 watts of electrical power — about enough to light an LED bulb. Transit IV-A broke an APL mission-duration record and confirmed the Earth’s equator is elliptical. It also set the stage for ground-breaking missions that have extended humanity’s reach across the solar system.
Since 1961, NASA has flown more than 25 missions carrying a nuclear power system through a successful partnership with the Department of Energy (DOE), which provides the power systems and plutonium-238 fuel.
“The department and our national laboratory partners are honored to play a role in powering NASA’s space exploration activities,” said Tracey Bishop, deputy assistant secretary in DOE’s Office of Nuclear Energy. “Radioisotope Power Systems are a natural extension of our core mission to create technological solutions that meet the complex energy needs of space research, exploration, and innovation.”
There are only two practical ways to provide long-term electrical power in space: the light of the sun or heat from a nuclear source.
We couldn’t do the mission without it. No other technology exists to power a mission this far away from the Sun, even today.
Alan Stern
Principal Investigator, NASA’s New Horizons Mission to Pluto and Beyond
“As missions move farther away from the Sun to dark, dusty, and harsh environments, like Jupiter, Pluto, and Titan, they become impossible or extremely limited without nuclear power,” said Leonard Dudzinski, chief technologist for NASA’s Planetary Science Division and program executive for Radioisotope Power.
That’s where Radioisotope Power Systems, or RPS, come in. They are a category of power systems that convert heat generated by the decay of plutonium-238 fuel into electricity.
“These systems are reliable and efficient,” said June Zakrajsek, manager for NASA’s Radioisotope Power Systems Program office at Glenn Research Center in Cleveland. “They operate continuously over long-duration space missions regardless of sunlight, temperature, charged particle radiation, or surface conditions like thick clouds or dust. They’ve allowed us to explore from the Sun to Pluto and beyond.”
RPS powered the Apollo Lunar Surface Experiment Package. They’ve sustained Voyager 1 and 2 since 1977, and they kept Cassini-Huygens’ instruments warm as it explored frigid Saturn and its moon Titan.
Today, a Multi-Mission Thermoelectric Generator (MMRTG) powers the Perseverance rover, which is captivating the nation as it searches for signs of ancient life on Mars, and a single RTG is sustaining New Horizons as it ventures on its way out of the solar system 15 years after its launch.
“The RTG was and still is crucial to New Horizons,” said Alan Stern, New Horizons principal investigator from the Southwest Research Institute. “We couldn’t do the mission without it. No other technology exists to power a mission this far away from the Sun, even today.”
New Horizons carries seven scientific instruments and a radioisotope thermoelectric generator. The spacecraft weighs 1,060 pounds. NASA/JHUAPL Great Things to Come: Science and Human Exploration
Dragonfly, which is set to launch in 2028, is the next mission with plans to use an MMRTG. Part of NASA’s New Frontiers program, Dragonfly is an octocopter designed to explore and collect samples on Saturn’s largest moon, Titan, an ocean world with a dense, hazy atmosphere.
“RPS is really an enabling technology,” said APL’s Zibi Turtle, principal investigator for the upcoming Dragonfly mission. “Early missions like Voyager, Galileo, and Cassini that relied on RPS have completely changed our understanding and given us a geography of the distant solar system…Cassini gave us our first close-up look at the surface of Titan.”
According to Turtle, the MMRTG serves two purposes on Dragonfly: power output to charge the lander’s battery and waste heat to keep its instruments and electronics warm.
“Flight is a very high-power activity. We’ll use a battery for flight and science activities and recharge the battery using the MMRTG,” said Turtle. “The waste heat from the power system is a key aspect of our thermal design. The surface of Titan is very cold, but we can keep the interior of the lander warm and cozy using the heat from the MMRTG.”
As the scientific community continues to benefit from RPS, NASA’s Space Technology Mission Directorate is investing in new technology using reactors and low-enriched uranium fuel to enable a robust human presence on the Moon and eventually human missions to Mars.
Astronauts will need plentiful and continuous power to survive the long lunar nights and explore the dark craters on the Moon’s South Pole. A fission surface power system could provide enough juice to power robust operations. NASA is leading an effort, working with the DOE and industry to design a fission power system for a future lunar demonstration that will pave the way for base camps on the Moon and Mars.
NASA has also thought about viable ways to reduce the time it takes to travel to Mars, including nuclear propulsion systems.
As NASA advances its bold vision of exploration and scientific discovery in space, it benefits from 60 years of the safe use of nuclear power during spaceflight. Sixty years of enlightenment that all started with a little satellite called Transit IV-A.
News Media Contact
Jan Wittry
NASA’s Glenn Research Center
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