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By Space Force
The mission successfully achieved a complex effort across multiple Space Force organizations to pull an existing GPS III satellite from storage, accelerate integration and launch vehicle readiness, and rapidly process for launch.
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By NASA
This article is from the 2024 Technical Update
Autonomous flight termination systems (AFTS) are being progressively employed onboard launch vehicles to replace ground personnel and infrastructure needed to terminate flight or destruct the vehicle should an anomaly occur. This automation uses on-board real-time data and encoded logic to determine if the flight should be self-terminated. For uncrewed launch vehicles, FTS systems are required to protect the public and governed by the United States Space Force (USSF). For crewed missions, NASA must augment range AFTS requirements for crew safety and certify each flight according to human rating standards, thus adding unique requirements for reuse of software originally intended for uncrewed missions. This bulletin summarizes new information relating to AFTS to raise awareness of key distinctions, summarize considerations and outline best practices for incorporating AFTS into human-rated systems.
Key Distinctions – Crewed v. Uncrewed
There are inherent behavioral differences between uncrewed and crewed AFTS related to design philosophy and fault tolerance. Uncrewed AFTS generally favor fault tolerance against failure-to-destruct over failing silent
in the presence of faults. This tenet permeates the design, even downto the software unit level. Uncrewed AFTS become zero-fault-to-destruct tolerant to many unrecoverable AFTS errors, whereas general single fault
tolerance against vehicle destruct is required for crewed missions. Additionally, unique needs to delay destruction for crew escape, provide abort options and special rules, and assess human-in-the-loop insight, command, and/or override throughout a launch sequence must be considered and introduces additional requirements and integration complexities.
AFTS Software Architecture Components and Best-Practice Use Guidelines
A detailed study of the sole AFTS currently approved by USSF and utilized/planned for several launch vehicles was conducted to understand its characteristics, and any unique risk and mitigation techniques for effective human-rating reuse. While alternate software systems may be designed in the future, this summary focuses on an architecture employing the Core Autonomous Safety Software (CASS). Considerations herein are intended for extrapolation to future systems. Components of the AFTS software architecture are shown, consisting of the CASS, “Wrapper”, and Mission Data Load (MDL) along with key characteristics and use guidelines. A more comprehensive description of each and recommendations for developmental use is found in Ref. 1.
Best Practices Certifying AFTS Software
Below are non-exhaustive guidelines to help achieve a human-rating
certification for an AFTS.
References
NASA/TP-20240009981: Best Practices and Considerations for Using
Autonomous Flight Termination Software In Crewed Launch Vehicles
https://ntrs.nasa.gov/citations/20240009981 “Launch Safety,” 14 C.F.R., § 417 (2024). NPR 8705.2C, Human-Rating Requirements for Space Systems, Jul 2017,
nodis3.gsfc.nasa.gov/ NASA Software Engineering Requirements, NPR 7150.2D, Mar 2022,
nodis3.gsfc.nasa.gov/ RCC 319-19 Flight Termination Systems Commonality Standard, White
Sands, NM, June 2019. “Considerations for Software Fault Prevention and Tolerance”, NESC
Technical Bulletin No. 23-06 https://ntrs.nasa.gov/citations/20230013383 “Safety Considerations when Repurposing Commercially Available Flight
Termination Systems from Uncrewed to Crewed Launch Vehicles”, NESC
Technical Bulletin No. 23-02 https://ntrs.nasa.gov/citations/20230001890 View the full article
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
On Dec. 10, 1974, NASA launched Helios 1, the first of two spacecraft to make close observations of the Sun. In one of the largest international efforts at the time, the Federal Republic of Germany, also known as West Germany, provided the spacecraft, NASA’s Goddard Space Flight Center in Greenbelt, Maryland, had overall responsibility for U.S. participation, and NASA’s Lewis, now Glenn, Research Center in Cleveland provided the launch vehicle. Equipped with 10 instruments, Helios 1 made its first close approach to the Sun on March 15, 1975, passing closer and traveling faster than any previous spacecraft. Helios 2, launched in 1976, passed even closer. Both spacecraft far exceeded their 18-month expected lifetime, returning unprecedented data from their unique vantage points.
The fully assembled Helios 1 spacecraft prepared for launch.Credit: NASA The West German company Messerchmitt-Bölkow-Blohm built the two Helios probes, the first non-Soviet and non-American spacecraft placed in heliocentric orbit, for the West German space agency DFVLR, today’s DLR. Each 815-pound Helios probe carried 10 U.S. and West German instruments, weighing a total of 158 pounds, to study the Sun and its environment. The instruments included high-energy particle detectors to measure the solar wind, magnetometers to study the Sun’s magnetic field and variations in electric and magnetic waves, and micrometeoroid detectors. Once activated and checked out, operators in the German control center near Munich controlled the spacecraft and collected the raw data. To evenly distribute the solar radiation the spacecraft spun on its axis once every second, and optical mirrors on its surface reflected the majority of the heat.
Workers encapsulate a Helios solar probe into its payload fairing. Credit: NASA
Launch of Helios 1 took place at 2:11 a.m. EST Dec. 10, 1974, from Launch Complex 41 at Cape Canaveral Air Force, now Space Force, Station, on a Titan IIIE-Centaur rocket. This marked the first successful flight of this rocket, at the time the most powerful in the world, following the failure of the Centaur upper stage during the rocket’s inaugural launch on Feb. 11, 1974. The successful launch of Helios 1 provided confidence in the Titan IIIE-Centaur, needed to launch the Viking orbiters and landers to Mars in 1976 and the Mariner Jupiter-Saturn, later renamed Voyager, spacecraft in 1977 to begin their journeys through the outer solar system. The Centaur upper stage placed Helios 1 into a solar orbit with a period of 190 days, with its perihelion, or closest point to the Sun, well inside the orbit of Mercury. Engineers activated the spacecraft’s 10 instruments within a few days of launch, with the vehicle declared fully operational on Jan. 16, 1975. On March 15, Helios 1 reached its closest distance to the Sun of 28.9 million miles, closer than any other previous spacecraft – Mariner 10 held the previous record during its three Mercury encounters. Helios 1 also set a spacecraft speed record, traveling at 148,000 miles per hour at perihelion. Parts of the spacecraft reached a temperature of 261 degrees Fahrenheit, but the instruments continued to operate without problems. During its second perihelion on Sept. 21, temperatures reached 270 degrees, affecting the operation of some instruments. Helios 1 continued to operate and return useful data until both its primary and backup receivers failed and its high-gain antenna no longer pointed at Earth. Ground controllers deactivated the spacecraft on Feb. 18, 1985, with the last contact made on Feb. 10, 1986.
Helios 1 sits atop its Titan IIIE-Centaur rocket at Launch Complex 41 at Cape Canaveral Air Force, now Space Force, Station in Florida.Credit: NASA
Helios 2 launched on Jan. 15, 1976, and followed a path similar to its predecessor’s but one that took it even closer to the Sun. On April 17, it approached to within 27 million miles of Sun, traveling at a new record of 150,000 miles per hour. At that distance, the spacecraft experienced 10% more solar heat than its predecessor. Helios 2’s downlink transmitter failed on March 3, 1980, resulting in no further useable data from the spacecraft. Controllers shut it down on Jan. 7, 1981. Scientists correlated data from the Helios instruments with similar data gathered by other spacecraft, such as the Interplanetary Monitoring Platform Explorers 47 and 50 in Earth orbit, the Pioneer solar orbiters, and Pioneer 10 and 11 in the outer solar system. In addition to their solar observations, Helios 1 and 2 studied the dust and ion tails of the comets C/1975V1 West, C/1978H1 Meier, and C/1979Y1 Bradfield. The information from the Helios probes greatly increased our knowledge of the Sun and its environment, and also raised more questions left for later spacecraft from unique vantage points to try to answer.
llustration of a Helios probe in flight, with all its booms deployed. Credit: NASA The joint ESA/NASA Ulysses mission studied the Sun from vantage points above its poles. After launch from space shuttle Discovery during STS-41 on Oct. 6, 1990, Ulysses used Jupiter’s gravity to swing it out of the ecliptic plane and fly first over the Sun’s south polar region from June to November 1994, then over the north polar region from June and September 1995. Ulysses continued its unique studies during several more polar passes until June 30, 2009, nearly 19 years after launch and more than four times its expected lifetime. NASA’s Parker Solar Probe, launched on Aug. 12, 2018, has made ever increasingly close passes to the Sun, including flying through its corona, breaking the distance record set by Helios 2. The Parker Solar Probe reached its first perihelion of 15 million miles on Nov. 5, 2018, with its closest approach of just 3.86 million miles of the Sun’s surface, just 4.5 percent of the Sun-Earth distance, planned for Dec. 24, 2024. The ESA Solar Orbiter launched on Feb. 10, 2020, and began science operations in November 2021. Its 10 instruments include cameras that have returned the highest resolution images of the Sun including its polar regions from as close as 26 million miles away.
Illustration of the Ulysses spacecraft over the Sun’s pole.Credit: NASA Illustration of the Parker Solar Probe during a close approach to the Sun.Credit: NASA The ESA Solar Orbiter observing the Sun.Credit: NASA About the Author
John J. Uri
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Last Updated Dec 10, 2024 Related Terms
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By NASA
NASA’s SPHEREx observatory undergoes integration and testing at BAE Systems in Boulder, Colorado, in April 2024. The space telescope will use a technique called spectroscopy across the entire sky, capturing the universe in more than 100 colors. BAE Systems Registration is open for digital content creators to attend the launch of NASA’s Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) mission, and NASA’s Polarimeter to Unify the Corona and Heliosphere (PUNCH) mission. SPHEREx will provide the first all-sky spectral survey, collecting data on more than 450 million galaxies along with more than 100 million stars in the Milky Way in order to explore the origins of the universe. PUNCH is a constellation of four small satellites in low-Earth orbit that will make global, 3D observations of the Sun’s corona to learn how the mass and energy there become solar wind.
NASA and SpaceX are targeting no earlier than February 2025 for the SPHEREx and PUNCH missions launch on a SpaceX Falcon 9 rocket from Space Launch Complex 4E at Vandenberg Space Force Base in California.
If your passion is to communicate and engage the world online, then this is the event for you! Seize the opportunity to see and share the SPHEREx and PUNCH missions’ launch.
A maximum of 50 social media users will be selected to attend this one-day event and will be given access similar to news media.
NASA Social participants will have the opportunity to:
View the launch of the SPHEREx and PUNCH satellites on a SpaceX Falcon 9 rocket. Tour NASA facilities at Vandenberg Space Force Base. Meet and interact with SPHEREx and PUNCH subject matter experts. Meet fellow space enthusiasts who are active on social media. NASA Social registration for the SPHEREx and PUNCH launch opens on Monday, Dec. 9, and the deadline to apply is Monday, Dec. 23 at noon ET. All social applications will be considered on a case-by-case basis.
APPLY NOW
Do I need to have a social media account to register?
Yes. This event is designed for people who:
Actively use multiple social networking platforms and tools to disseminate information to a unique audience. Regularly produce new content that features multimedia elements. Have the potential to reach a large number of people using digital platforms, or reach a unique audience, separate and distinctive from traditional news media and/or NASA audiences. Must have an established history of posting content on social media platforms. Have previous postings that are highly visible, respected, and widely recognized. Users on all social networks are encouraged to use the hashtag #NASASocial. Updates and information about the event will be shared via @NASASocial and @NASA_LSP on X and via posts to LSP’s Facebook.
How do I register?
Registration for this event opens Monday, Dec. 9, and closes Monday, Dec. 23 at noon ET. Registration is for one person only (you) and is nontransferable. Each individual wishing to attend must register separately. Each application will be considered on a case-by-case basis.
Can I register if I am not a U.S. citizen?
Because of the security restrictions on the Space Force base, registration is limited to U.S. citizens. If you have a valid permanent resident card, you will be processed as a U.S. citizen.
When will I know if I am selected?
After registrations have been received and processed, an email with confirmation information and additional instructions will be sent to those selected. We expect to send the acceptance notifications by Jan. 31.
What are NASA Social credentials?
All social applications will be considered on a case-by-case basis. Those chosen must prove through the registration process that they meet specific engagement criteria.
If you do not make the registration list for this NASA Social, you still can attend the launch offsite and participate in the conversation online.
What are the registration requirements?
Registration indicates your intent to travel to Vandenberg Space Force Base in California and attend the one-day event in person. You are responsible for your own expenses for travel, accommodations, food, and other amenities.
Some events and participants scheduled to appear at the event are subject to change without notice. NASA is not responsible for loss or damage incurred as a result of attending. NASA, moreover, is not responsible for loss or damage incurred if the event is cancelled with limited or no notice. Please plan accordingly.
Vandenberg is a government facility. Those who are selected will need to complete an additional registration step to receive clearance to enter the secure areas.
IMPORTANT: To be admitted, you will need to provide two forms of unexpired government-issued identification; one must be a photo ID and match the name provided on the registration. Those without proper identification cannot be admitted.
For a complete list of acceptable forms of ID, please visit: NASA Credentialing Identification Requirements.
All registrants must be at least 18 years old.
What if the launch date changes?
Many different factors can cause a scheduled launch date to change multiple times. If the launch date changes, NASA may adjust the date of the NASA Social accordingly to coincide with the new target launch date. NASA will notify registrants of any changes by email.
If the launch is postponed, attendees will be invited to attend a later launch date. NASA cannot accommodate attendees for delays beyond 72 hours.
NASA Social attendees are responsible for any additional costs they incur related to any launch delay. We strongly encourage participants to make travel arrangements that are refundable and/or flexible.
What if I cannot come to Vandenberg Space Force Base?
If you cannot come to Vandenberg Space Force Base and attend in person, you should not register for the NASA Social. You can follow the conversation online using #NASASocial.
You can watch the launch on NASA+ or plus.nasa.gov/. NASA will provide regular launch and mission updates on @NASA and @NASA_LSP on X.
If you cannot make this NASA Social, don’t worry; NASA is planning many other Socials in the near future at various locations! Check back here for updates.
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By NASA
7 Min Read 2024 Be An Astronaut Campaign
NASA astronaut Andrew Morgan tethered to the International Space Station during a spacewalk. Credits: NASA NASA astronauts have been traveling to space for more than six decades and living there continuously since 2000. Now, NASA’s Artemis program is preparing to land the first woman and the next man on the Moon. As NASA continues to expand human exploration in our solar system, we will need more than the currently active astronauts to crew spacecraft bound for deep-space destinations.
Every four years, NASA opens its doors and welcomes thousands of applicants to join a new class of astronauts that will push human spaceflight to new depths. Astronaut applications opened March 5, 2024, and closed April 16, 2024. In those 42 days, NASA’s 2024 Be An Astronaut Campaign used various platforms to promote the beauty of human spaceflight, explore opportunities to reach untapped and underserved audiences, encourage the younger generations to follow their dreams and pursue a career as an astronaut, and inspire the world about the capabilities we have as humans to explore farther than we ever have before.
Official “Be a NASA Astronaut” Video
To kick off the astronaut recruitment campaign, NASA, NASA Johnson, NASA Artemis, and NASA Astronauts accounts collaborated on a video narrated by Morgan Freeman on Instagram reaching over 9.7 million views. This video, seen below, was shared across agency social media platforms, YouTube, and digital sites to introduce the start of the astronaut application period.
The Universe is Calling: Apply to Be a NASA Astronaut, official NASA astronaut recruitment video featuring a voice over by Morgan Freeman. "Spaceflight is just one part of it. You are a team member before you are any thing in this role."
April Jordan
Manager of NASA Astronaut Selection
Throughout the campaign, #BeAnAstronaut was utilized to increase campaign awareness and engagement. This hashtag was used by 36 agency accounts and totaled 167 posts across the agency. With over 15,000 social media mentions, 256,655 total page views throughout the campaign, and news presence on the Today Show, TIME Magazine, Yahoo News, The New York Times, and more, the Be An Astronaut campaign was a successful and exciting project that inspired aspiring astronauts to follow their dreams.
2024 Astronaut Graduation
On March 5, 2024, not only did astronaut applications open, but the 2021 class of NASA astronaut candidates graduated, officially making them astronauts and eligible for spaceflight. These newly graduated astronauts created a superlative to demonstrate just how NASA’s astronaut corps works as a team and family as they passed the torch down to NASA’s next class of astronauts.
The 2024 astronaut graduating class gives you an insider’s look at not only the who’s who of their graduating class, but it allows you to get a glimpse of the accomplished astronauts’ personalities. To see them together as a group, connecting through laughter helps to illustrate how much they value team care. These classic superlatives give the scoop on which astronaut is the best dancer, the funniest, and more. Enjoy seeing a lighter side of “The Flies” in this fun and upbeat montage of the 2024 astronaut graduating class.
Astronaut Candidate Countdown
Our astronaut graduation countdown campaign celebrated the most recent graduating class of astronauts. The previous class completed two years of rigorous training at Johnson Space Center before they officially gained their wings. This campaign not only highlighted their achievements, but hopefully inspired potential candidates by showcasing the journey from trainee to astronaut. During the graduation ceremony, applications for the next astronaut class were announced, continuing the legacy of excellence and exploration.
NASA astronaut Luke Delaney poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Jessica Wittner poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Jack Hathaway poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Andre Douglas poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Nichole Ayers poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Marcos Berrios poses for the Astronaut Graduation Countdown.Credit: NASA Mohammed Bin Rashid Space Center astronaut Nora AlMatrooshi poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Anil Menon poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Deniz Burnham poses for the Astronaut Graduation Countdown.Credit: NASA Mohammed Bin Rashid Space Center astronaut Mohammed AlMulla poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Christina Birch poses for the Astronaut Graduation Countdown.Credit: NASA NASA astronaut Christopher Williams poses for the Astronaut Graduation Countdown.Credit: NASA
NASA Tumblr Thread
For many people, human spaceflight has been a part of their lives for decades. After years of exploring, hundreds of astronauts have shared their unique experiences with the world and inspired many to want to follow in their footsteps. With over 100 thousand impressions on Tumblr, NASA posted a unique thread on “5 Myths About Becoming an Astronaut”.
https://www.tumblr.com/nasa/132538793869/5-myths-about-becoming-an-astronaut NASA’s Tumblr thread on “5 Myths About Becoming an Astronaut”. Credit: NASA
STEM Pinterest Pin
Reaching various audiences of all ages, backgrounds, demographics, and experiences was key during the Be An Astronaut Campaign. Not only was it important for this campaign to reach qualifying applicants, but it was just as important to reach the aspiring astronauts of the younger generation.
NASA posted on Pinterest 10 ways students can kick-start their space journeys within NASA’s Office of STEM Engagement, or OSTEM. Through this post, NASA was able to reach over 40 thousand students and share ways to get involved with NASA’s missions.
A NASA astronaut during a spacewalk outside the International Space Station with the text, “10 Ways Students Can Prepare to #BeAnAstronaut”Credit: NASA "[NASA’s] decisions have led us to having an astronaut office that looks very much like America. You could reach in and grab any four people, and they would look like our crew.”
Victor glover
NASA Astronaut, Artemis II Pilot
NASA @ SXSW
A graphic of the International Space Station with the text, “Live from Space at SXSW: NASA Astronauts and Your Work in Orbit”.Credit: NASA NASA astronauts Jeanette Epps and Loral O’Hara joined NASA experts at the South by Southwest conference in Austin, Texas live from space on March 12, 2024. The astronauts joined a panel from aboard the International Space Station to discuss what it’s like to be an astronaut, how people can get involved with space station research and technology, and how to apply to become an astronaut.
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Kristin Fabre, Jennifer Buchli, Leah Cheshier, Loral O’Hara & Jeanette Epps at Featured Session: Live from Space: NASA Astronauts & Your Work in Orbit as part of SXSW 2024 Conference and Festivals held at the Austin Convention Center on March 12, 2024 in Austin, Texas. Credit: Stephen Olker/SXSW Conference & Festivals via Getty Images)
Vice President Encourages Applicants
Vice President Kamala Harris quoted NASA on X to encourage people to apply to become an astronaut reaching more than 885 thousand users on the social media platform.
Vice President Kamala Harris’ post on X stating, “As Chair of the National Space Council, I am honored to witness our astronauts’ skill and determination first-hand. There is no typical path for an astronaut, and the next class of NASA astronauts will continue to lead the world in space exploration.”.
Astronaut Reddit AMA
Our Astronaut Recruitment Reddit AMA on March 20th was the top post on Reddit with 25 million subscribers, and stayed pinned to the top of the subreddit for several days. NASA astronauts Shannon Walker, Jessica Watkins, and Luke Delaney discussed what it takes to be an astronaut as well as personal insights into their journey.
Merriam-Webster Word of the Day: Astronaut
NASA astronaut and member of the recently graduated 2021 class of NASA astronauts, Deniz Burnham, participated in the “Word of the Day” series with Merriam-Webster defining the word ‘astronaut’. Just weeks after officially becoming an astronaut, Deniz’s video was featured on Merriam-Webster’s website and social media platforms.
NASA astronaut Deniz Burnham featured in Merriam-Webster’s word of the day video defining the word “astronaut”.
Houston, We Have a Podcast
On NASA’s top-rated podcast, “Houston We Have a Podcast,” our astronaut recruitment episode garnered over 4,000 plays on Apple Podcasts and more than 1,000 plays on Spotify. In this episode, the manager of NASA astronaut selection discussed the selection process and how to apply for an out-of-this-world career.
A lone spacesuit can be seen in the middle of the image, as a black shadow of the helmet reflects three question marks.Credit: NASA United States Army Astronaut Recruitment Video
NASA astronaut and U.S. Army Col. Anne McClain discussed her experience as an astronaut and how other members of the U.S. Army can apply to become an astronaut and travel to space like her. This video was posted on the U.S. Army’s social media as well as posted to YouTube reaching thousands of supporters in and of the military.
Col. Anne McClain, commander of the U.S. Army NASA detachment, shares information on eligibility as well as where and when to apply to become a NASA astronaut like herself. Credit: U.S. Army Read More
Become An Astronaut Webpage
NASA’s ‘Become An Astronaut’ webpage drove 246,655 viewers to the page throughout the duration of the recruitment campaign from internal and external collaborations across various digital platforms and events. Listing job requirements, frequently asked questions, and how to apply, the webpage consisted of 87.1% new visitors to the site and had almost 28 thousand referrals from Instagram.
NASA’s ‘Become An Astronaut’ webpage.Credit: NASA Read More
The 2024 Be An Astronaut Campaign ranged from March 5, 2024 to April 16, 2024 and successfully integrated various platforms, outreach opportunities, and educational resources into the recruitment of our next class of astronauts.
With over 15 thousand social media mentions, 2 thousand news outlet mentions, $4.6 million in publicity value, a 91% positive sentiment, and 195 countries involved in the conversation, the campaign was able to inspire NASA’s future space explorers and push the agency closer to returning to the Moon and going to Mars.
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Last Updated Dec 09, 2024 Related Terms
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