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By Space Force
U.S. Space Forces - Space supports NASA human space flight by planning, integrating, executing, and assessing space operations, providing continuous space situational awareness monitoring for the International Space Station and visiting spacecraft.
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By NASA
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Preparations for Next Moonwalk Simulations Underway (and Underwater)
Expedition 64 Flight Engineer Victor Glover of NASA sips on a water bag. The latest book marks our third effort to review available literature regarding the role of nutrition in astronaut health. In 2009, we reviewed the existing knowledge and history of human nutrition for spaceflight, with a key goal of identifying additional data that would be required before NASA could confidently reduce the risk of an inadequate food system or inadequate nutrition to as low as possible in support of human expeditions to the Moon or Mars. We used a nutrient-by-nutrient approach to address this effort, and we included a brief description of the space food systems during historical space programs.
In 2014, we published a second volume of the book, which was not so much a second edition, but rather a view of space nutrition from a different perspective. This volume updated research that had been published in the intervening 6 years and addressed space nutrition with a more physiological systems-based approach.
The current version is an expanded, updated version of that second book, providing both a systems approach overall, but also including details of nutrients and their roles within each system. As such, this book is divided into chapters based on physiological systems (e.g., bone, muscle, ocular); highlighted in each chapter are the nutrients associated with that particular system. We provide updated information on space food
systems and constraints of the same, and provide dietary intake data from International Space Station (ISS) astronauts.
We present data from ground-based analog studies, designed to mimic one or more conditions similar to those produced by spaceflight. Head-down tilt bed rest is a common analog of the general (and specifically musculoskeletal) disuse of spaceflight. Nutrition research from Antarctica relies on the associated confinement
and isolation, in addition to the lack of sunlight exposure during the winter months. Undersea habitats help expand our understanding of nutritional changes in a confined space with a hyperbaric atmosphere. We also review spaceflight research, including data from now “historical” flights on the Space Shuttle, data from the Russian space station Mir, and earlier space programs such as Apollo and Skylab. The ISS, now more than
20 years old, has provided (and continues to provide) a wealth of nutrition findings from extended-duration spaceflights of 4 to 12 months. We review findings from this platform as well, providing a comprehensive review of what is known regarding the role of human nutrition in keeping astronauts healthy.
With this latest book, we hope we have accurately captured the current state of the field of space food and nutrition, and that we have provided some guideposts for work that remains to be done to enable safe and successful human exploration beyond low-Earth orbit.
Human Adaptation to Spaceflight: The Role of Food and Nutrition – 2nd Edition
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Human Adaptation to Spaceflight: The Role of Food and Nutrition – 1st Edition
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Last Updated Oct 23, 2024 EditorRobert E. LewisLocationJohnson Space Center Related Terms
Human Health and Performance Keep Exploring Discover More Topics From NASA
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Humans in Space
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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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By Space Force
U.S. Space Command and the Department of Commerce are migrating the provision of public services relating to spaceflight safety, currently provided via space-track.org, from USSPACECOM to OSC’s new Traffic Coordination System for Space.
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By NASA
Experienced spacewalkers, university students, flight controllers, and NASA team members at all stages of their career recently came together at Johnson Space Center’s Neutral Buoyancy Laboratory (NBL) for an anniversary celebration that looked to the future as much as the past. The Office of STEM Engagement’s Micro-g Neutral Buoyancy Experiment Design Teams (Micro-g NExT) marked a decade of inspiring the next generation of space explorers with four days of exciting hands-on experiences and events commemorating those who have shaped the annual challenge.
Students pose at NASA Johnson’s Neutral Buoyancy Laboratory (NBL) before beginning test week with their projects that will benefit future Artemis missions. Credit: NASA/Bill Stafford
From June 2-5, NASA welcomed 17 student teams from 13 U.S. colleges and universities to the NBL for a once-in-a-lifetime opportunity. The 87 students spent months designing and building devices or tools that could support lunar surface spacewalks and future Artemis missions, earning a chance to test their unique prototypes at the NBL.
Teams chose from four design challenge options – create an anchoring device for a lunar flagpole, design a lunar mapbook, develop a lunar tool carrier, or create a target recognition system camera for post-landing search and rescue operations – and submitted technical proposals for Micro-g NExT staff to review in October 2023. The selected student teams were announced in November and introduced to their mentors in December. Those mentors provided continuous support and expertise as teams manufactured their prototypes, submitted their preliminary design review, and completed initial tests prior to traveling to Houston. Mentors represented Johnson organizations including the Flight Operations Directorate, Extravehicular Activity and Human Surface Mobility Program, Engineering, and the Safety and Mission Assurance Directorate.
Another familiar face at Johnson was involved in the challenge, as well: former NASA astronaut Steve Swanson, who was the Boise State University team’s faculty advisor. Swanson is a three-time spaceflight veteran who completed four spacewalks and logged and a total of 195 days in space, which enabled him to provide the students with valuable design insights.
Former NASA astronaut Steve Swanson with members of the Boise State University Micro-g NExT team at the NBL. NASA/David DeHoyos
Once they arrived at the NBL, students received a pre-test briefing from Flight Director Rebecca Wingfield about best practices for communication from a mission control perspective. She also debriefed with teams to provide students with feedback that enhanced their learning experience and gave them a deeper understanding of their projects’ impact on the Artemis campaign.
NASA Flight Director Rebecca Wingfield conducts a pre-test briefing for Micro-g NExT teams. Credit: NASA/James Blair
NASA astronaut Nicole Mann supported students in the test control room as they underwent testing and were in direct communication with the diver using their prototype in the pool. Mann also conducted a series of post-test debriefs with several teams to give them insight on how their designs were helpful and how they can improve.
NASA astronaut Nicole Mann in the NBL control room with Micro-g NExT participants.NASA/James Blair Students also had the opportunity to participate in a poster session at Johnson’s Teague Auditorium to showcase their products and the process from proposal to completion of testing. Artemis Student Challenge Awards were presented to top teams in three categories – Innovation, Pay it Forward (for community engagement and outreach), and Artemis Educator (for a team’s faculty advisor).
Micro-g NExT poster session in the lobby of Johnson Space Center’s Teague Auditorium. NASA/David DeHoyos
The whirlwind week kicked off with a reception for Micro-g NExT alumni who were recognized for their past efforts and dedication to space exploration. Certificates of appreciation were given to the program’s ‘pioneers’ – the NASA employees, contractors, and interns who helped to create Micro-g NExT 10 years ago.
Several tools made by student teams during prior challenges were on display, including a zip-tie cutter designed by the Lone Star College-Cy Fair team in spring 2019 that was used aboard the International Space Station by European Space Agency astronaut Luca Parmitano. Members of that team shared their Micro-g NExT experience with reception attendees. “It gives students the best real-world experience and learning opportunity I have seen,” said James Philippi.
Students and staff also heard from several Micro-g NExT alumni during a Q&A panel. Panelists included Harriet Hunt, CRONUS flight controller trainee; Aaron Simpson, xEMU Portable Life Support System engineer intern; Alexis Vance, environmental systems flight controller; Kim Wright, electrical, mechanical, and external thermal systems engineer; and Sam Whitlock, spaceflight systems engineering intern at Axiom Space. Each shared how Micro-g NExT impacted them personally and professionally, underscoring the long-term value of participating in the challenge and the program’s ability to attract next-generation talent to the agency.
Micro-g NExT alumni during a Q&A session with this year’s challenge participants and NASA team members. NASA/James Blair Adding to this legacy, two of the 2024 Micro-g NExT participants ended their challenge experience by starting work with NASA. Alana Falter from the University of Illinois-Urbana Champaign returned to NASA as a Pathways Intern, and Adrian Garcia from the University of Houston-Clear Lake returned as a contractor with Barrios Technology.
Another nod to the challenge’s impact was a special 10-year patch and logo designed by Justin Robert from the Michoud Assembly Facility through the NASA Spark challenge to commemorate the Micro-g NExT milestone.
10-year anniversary of Micro-g NExT logos.Credit: NASA “Student design challenges have been a critical pipeline for both NASA internship participants and preparing students to be successful in STEM careers,” said Jamie Semple, NASA activity manager for Micro-g NExT. “By participating in these activities, students have the opportunity to create a product that could be part of spaceflight history, all while building essential skills for the next step in their career.” Semple added, “We also see the challenge’s impact with former participants now becoming our Micro-g NExT challenge owners. These people are now leading the program into the future and continuing the legacy of creating leaders in the STEM workforce and for the NASA community.”
Reflecting on their experience, Smith Juback from Clemson University said working cooperatively with teammates was their favorite part of this design challenge. “We all had different ideas and ways to solve different problems and being able to incorporate everyone’s ideas together made us all smarter in the end,” he said. “I think we all learned so much individually about how to make and design a product, and we grew as people, students, and designers.”
Students from the University of Nebraska-Lincoln team said, “Working with astronauts in a professional environment like the Neutral Buoyancy Laboratory is about precision since time is so valuable and you have to make the most of it. Back at home, we have several hours to test our project and if it breaks it breaks. But in the NBL, we have 12 minutes to run through seven tests. This experience is something you can only get here at Micro-g NExT.”
A Micro-g NExT participant directs testing from the NBL control room. Credit: NASA After four days of learning, testing, and networking, Micro-g NExT has reached a decade of providing greater knowledge and inspiration to youth across the country. As one of NASA’s Artemis student challenges, Micro-g NExT will continue to offer undergraduate students the opportunity to design and create mission-ready hardware to benefit the future of deep space exploration. Learn more about Micro-g NExT and other Artemis student challenges at https://stem.nasa.gov/artemis/.
Students in the control room at NASA’s Neutral Buoyancy Laboratory test their projects underwater with a diver in the pool. Credit: NASA/James Blair A student team works on their project before testing at the Neutral Buoyancy Laboratory.Credit: NASA/James Blair NASA astronaut Nicole Mann and a diver from NASA’s Neutral Buoyancy Laboratory brief with two students about their lunar flagpole before testing underwater. Credit: NASA/James Blair A student team being awarded a ‘Pay It Forward’ award at Micro-g NExT at Johnson Space Center. Credit: NASA/David DeHoyos A student team from Boise State University poses with an ‘Innovation Award’ they received at Micro-g NExT at Johnson Space center. Credit: NASA/David DeHoyos Students, mentors, and NASA personnel pose with two awards, the ‘Artemis Educator Award’ and the ‘Pay It Forward Award’, at Johnson Space Center in Houston.Credit: NASA/David DeHoyos View the full article
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