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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 NASA
4 Min Read NASA to Embrace Commercial Sector, Fly Out Legacy Relay Fleet
An artist's concept of commercial and NASA space relays. Credits: NASA/Morgan Johnson NASA is one step closer on its transition to using commercially owned and operated satellite communications services to provide future near-Earth space missions with increased service coverage, availability, and accelerated science and data delivery.
As of Friday, Nov. 8, the agency’s legacy TDRS (Tracking and Data Relay Satellite) system, as part of the Near Space Network, will support only existing missions while new missions will be supported by future commercial services.
“There have been tremendous advancements in commercial innovation since NASA launched its first TDRS satellite more than 40 years ago,” said Kevin Coggins, deputy associate administrator of NASA’s SCaN (Space Communications and Navigation) program. “TDRS will continue to provide critical support for at least the next decade, but now is the time to embrace commercial services that could enhance science objectives, expand experimentation, and ultimately provide greater opportunities for discovery.”
TDRS will continue to provide critical support for at least the next decade, but now is the time to embrace commercial services."
Kevin Coggins
Deputy Associate Administrator for NASA’s SCaN
Just as NASA has adopted commercial crew, commercial landers, and commercial transport services, the Near Space Network, managed by NASA’s SCaN, will leverage private industry’s vast investment in the Earth-based satellite communications market, which includes communications on airplanes, ships, satellite dish television, and more. Now, industry is developing a new space-based market for these services, where NASA plans to become one of many customers, bolstering the domestic space industry.
NASA’s Communications Services Project is working with industry through funded Space Act Agreements to develop and demonstrate commercial satellite communications services that meet the agency’s mission needs, and the needs of other potential users.
In 2022, NASA provided $278.5 million in funding to six domestic partners so they could develop and demonstrate space relay communication capabilities.
Inmarsat Government Inc. Kuiper Government Solutions (KGS) LLC SES Government Solutions Space Exploration Technologies (SpaceX) Telesat U.S. Services LLC Viasat Incorporated Read More About the CSP Partners An artist’s concept of commercial relay satellites. NASA/Morgan Johnson A successful space-based commercial service demonstration would encompass end-to-end testing with a user spacecraft for one or more of the following use cases: launch support, launch and early operations phase, low and high data rate routine missions, terrestrial support, and contingency services. Once a demonstration has been completed, it is expected that the commercial company would be able to offer their services to government and commercial users.
NASA also is formulating non-reimbursable Space Act Agreements with members of industry to exchange capability information as a means of growing the domestic satellite communications market. The Communications Services Project currently is partnered with Kepler Communications US Inc. through a non-reimbursable Space Act Agreement.
As the agency and the aerospace community expand their exploration efforts and increase mission complexity, the ability to communicate science, tracking, and telemetry data to and from space quickly and securely will become more critical than ever before. The goal is to validate and deliver space-based commercial communications services to the Near Space Network by 2031, to support future NASA missions.
NASA’s Tracking and Data Relay System
While TDRS will not be accepting new missions, it won’t be retiring immediately. Current TDRS users, like the International Space Station, Hubble Space Telescope, and many other Earth- and universe-observing missions, will still rely on TDRS until the mid-2030s. Each TDRS spacecraft’s retirement will be driven by individual health factors, as the seven active TDRS satellites are expected to decline at variable rates.
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An artist's concept of the International Space Station using NASA’s Tracking and Data Relay Satellite (TDRS) fleet to transmit data to Earth. NASA The TDRS fleet began in 1983 and consists of three generations of satellites, launching over the course of 40 years. Each successive generation of TDRS improved upon the previous model, with additional radio frequency band support and increased automation.
The first TDRS was designed for a mission life of 10 years, but lasted 26 years before it was decommissioned in 2009. The last in the third generation – TDRS-13 –was launched Aug. 18, 2017.
The TDRS constellation has been a workhorse for the agency, enabling significant data transfer and discoveries.”
DAve Israel
Near Space Network Chief Architect
“Each astronaut conversation from the International Space Station, every picture you’ve seen from Hubble Space Telescope, Nobel Prize-winning science data from the COBE satellite, and much more has flowed through TDRS,” said Dave Israel, Near Space Network chief architect. “The TDRS constellation has been a workhorse for the agency, enabling significant data transfer and discoveries.”
NASA’s Tracking and Data Relay Satellite 13 (TDRS-13) atop an Atlas V rocket at NASA’s Kennedy Space Center in Florida before launch. NASA/Tony Gray and Sandra Joseph The Near Space Network and the Communications Services Project are funded by NASA’s SCaN (Space Communications and Navigation) program office at NASA Headquarters in Washington. The network is operated out of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and the Communications Services Project is managed out of NASA’s Glenn Research Center in Cleveland.
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Last Updated Oct 16, 2024 EditorGoddard Digital TeamContactKatherine Schauerkatherine.s.schauer@nasa.govMolly KearnsLocationGoddard Space Flight Center Related Terms
Communicating and Navigating with Missions Glenn Research Center Goddard Space Flight Center Space Communications & Navigation Program The Future of Commercial Space Tracking and Data Relay Satellite (TDRS) Explore More
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By European Space Agency
With the initial images from each of the instruments aboard ESA’s EarthCARE satellite now in hand, it's time to reveal how these four advanced sensors work in synergy to measure exactly how clouds and aerosols influence the heating and cooling of our atmosphere.
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By NASA
Young women, ages 11 to 18, from Atlanta, Georgia, with interests in STEM (science, technology, engineering, and math), pose for a photo on Friday, Sept. 20, 2024, at the Launch and Landing Facility following their arrival at NASA’s Kennedy Space Center in Florida. The Delta Air Lines Women Inspiring Our Next Generation (WING) flight, with the help of NASA Kennedy, showcases the various women-led STEM careers available at the Florida spaceport. NASA/Kim Shiflett For the third straight year, scores of young women flew to NASA’s Kennedy Space Center in Florida to learn how to make their aviation dreams take flight as part of the Delta Air Lines Women Inspiring our Next Generation (WING) program. Their Boeing 737 aircraft, piloted by an all-female crew, carried 130 girls, ages 11 to 18, who hail from Atlanta area schools and aviation organizations with a strong focus on STEM.
They departed Atlanta’s Hartsfield-Jackson International Airport just after sunrise on Sept. 20 and just a few hours later, stepped onto the runway of Kennedy’s Launch and Landing Facility, where dozens of space shuttle missions landed and current-day NASA astronauts arrive at ahead of their launches to the International Space Station.
A Delta plane, carrying an all-female crew and 130 young women ages 11 to 18, received a “water salute” upon arrival on Friday, Sept. 20, 2024, at the Launch and Landing Facility at NASA’s Kennedy Space Center in Florida.NASA/Kim Shiflett “For more than 60 years, Kennedy Space Center has been the launching point for many of the missions that have inspired the nation and challenged generations of students to reach for the stars,” said NASA Kennedy Director Janet Petro. “As an aviator myself, today is especially exciting because it showcases the diverse range of career opportunities available to young women interested in pursuing fields in science, technology, engineering, and math.”
The girls received a bus tour of NASA Kennedy facilities and photo opportunities at Launch Complex 39B, where the first woman to set foot on the Moon will launch in the coming years on Artemis III. Then at the spaceport’s Space Systems Processing Facility, the girls heard firsthand from NASA Kennedy’s women leaders, who offered encouragement and words of wisdom.
“I want you to look around you. The young women in this room are going to be the trailblazers of the Artemis Generation,” said Dicksy Chrostowski, director of the Office of Communications at NASA Kennedy. “You may very well live and work on the Moon, or be one of our first visitors to Mars. There is always a path to greatness for you to take, even if it’s hard to find.”
The girls of the Delta WING flight finished their day exploring the Kennedy Space Center Visitor Complex before reboarding the plane for their return trip to Atlanta. The experience of visiting NASA’s iconic spaceport and the lessons imparted by the women of NASA resonated with the girls.
From left to right, Savitri Thomas, management and program analyst; Ales-Cia Winsley, lead Space Launch System avionics engineer; and Alexandra Philip, metrology engineer, at NASA’s Kennedy Space Center in Florida, speak on Friday, Sept. 20, 2024, to the young women of the Delta WING flight about their NASA careers and the value of STEM education.NASA/Kim Shiflett “As a woman of color, it’s great to see other women who look like me in these spaces and it’s very uplifting to hear their stories and how far they’ve come,” said Karsyn Britton-Mauge, a seventh grader from the Ron Clark Academy in Atlanta. “Life is filled with ups and downs, and I am so inspired by the persistence in all the women who spoke to us today. They never stopped pursuing their dreams.”
The focus on STEM education as a path to a career in aviation has been a key feature of the annual Delta WING flight since the program launched in 2015. That’s when Delta General Manager of Pilot Development Beth Poole and Delta Pilot Cheri Rohlfing noted a conspicuous lack of women in certain roles of the airline industry, including mechanics, ground personnel, and especially pilots. They initiated Delta WING flights, spearheaded by Delta’s Flight Operations and organized and operated solely by women, as a way of inspiring and educating the next generation of young women on careers in aviation. This year’s trip to NASA Kennedy was the eighth Delta WING flight and third to Kennedy.
“The accomplishments of the future are going to be realized by the dreamers, innovators, and bright minds who are sitting in classrooms today,” Petro said. “And we want these students to know there is a place for them at NASA.”
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