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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Syncom Space Services employees Kenneth Shipman, left, and Jesse Yarbrough perform final tubing install in early March to prepare the interstage simulator gas system on the Thad Cochran Test Stand at NASA’s Stennis Space Center for leak checks. Leak checks were performed prior to activation of the gas system this month. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand.NASA/Danny Nowlin Syncom Space Services employees Branson Cuevas, left, Kenneth Shipman, and Jesse Yarbrough install final tubing in early March before activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the stand.NASA/Danny Nowlin Crews at NASA’s Stennis Space Center recently completed activation of interstage gas systems needed for testing a new SLS (Space Launch System) rocket stage to fly on future Artemis missions to the Moon and beyond.
The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand. For Green Run, teams will activate and test all systems to ensure the stage is ready to fly. Green Run will culminate with a hot fire of the stage’s four RL10 engines, just as during an actual mission.
The interstage simulator component will function like the SLS interstage section that protects the upper stage during Artemis launches. The interstage simulator will do the same during Green Run testing of the stage at NASA Stennis.
The interstage simulator gas system will provide helium, nitrogen, and hydrogen to the four RL10 engines for all wet dress and hot fire exercises and tests.
During the activation process, NASA Stennis crews simulated the engines and flowed gases to mirror various conditions and collect data on pressures and temperatures. NASA Stennis teams conducted 80 different flow cases, calculating such items as flow rates, system pressure drop, and fill/vent times. The calculated parameters then were compared to models and analytics to certify the gas system meets performance requirements.
NASA engineers Chad Tournillon, left, and Robert Smith verify the functionality of the control system in early March for activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the stand.NASA/Danny Nowlin Members of the engineering and operations team review data as it is collected in early March during activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. Pictured are NASA’s Mark Robinson, Robert Simmers, Jack Conley, and Nick Nugent. Activation of the gas systems marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand.NASA/Danny Nowlin NASA engineers Pablo Gomez, left, and B.T. Wigley collect data in early March during activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the NASA Stennis stand.NASA/Danny Nowlin Syncom Space Services employees Brandon Fleming, Robert Sheaffer, and Logan Upton review paperwork in early March prior to activation of the interstage simulator gas systems on the Thad Cochran Test Stand at NASA’s Stennis Space Center. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the stand.NASA/Danny Nowlin Syncom Space Services engineering tech Brandon Fleming tightens a pressure transducer on the Thad Cochran Test Stand at NASA’s Stennis Space Center in early March. Various transducers were used to provide data during subsequent activation of the interstage simulator gas systems at the stand. The activation marks a milestone in preparation for future Green Run testing of NASA’s exploration upper stage (EUS) in the B-2 position of the Thad Cochran Test Stand.NASA/Danny Nowlin Crews now will work to activate the umbilical gases and liquid oxygen systems. The NASA Stennis team will then conduct water system activation, where it will flow the flame deflector, aspirator, diffuser cooling circuits, purge rings and water-cooled fairing.
Afterward, the team will deploy the FireX system to check for total coverage, expected to be completed in the summer.
Before the exploration upper stage, built by Boeing at NASA’s Michoud Assembly Facility in New Orleans, arrives at NASA Stennis, crews will perform a final 24-hour check, or stress test, across all test complex facilities to demonstrate readiness for the test series.
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Researchers use a flat aerogel array antenna to communicate with a geostationary satellite above the Earth during tests at NASA’s Glenn Research Center in Cleveland.Credit: NASA/Jordan Cochran NASA engineers are using one of the world’s lightest solid materials to construct an antenna that could be embedded into the skin of an aircraft, creating a more aerodynamic and reliable communication solution for drones and other future air transportation options.
Developed by NASA, this ultra-lightweight aerogel antenna is designed to enable satellite communications where power and space are limited. The aerogel is made up of flexible, high-performance plastics known as polymers. The design features high air content (95%) and offers a combination of light weight and strength. Researchers can adjust its properties to achieve either the flexibility of plastic wrap or the rigidity of plexiglass.
“By removing the liquid portion of a gel, you’re left with this incredibly porous structure,” said Stephanie Vivod, a chemical engineer at NASA’s Glenn Research Center in Cleveland. “If you’ve ever made Jell-O, you’ve performed chemistry that’s similar to the first step of making an aerogel.”
NASA sandwiched a layer of aerogel between a small circuit board and an array of thin, circular copper cells, then topped the design off with a type of film known for its electrical insulation properties. This innovation is known at NASA and in the aviation community as an active phased array aerogel antenna.
A sample of aerogel is folded to demonstrate its flexibility during testing at NASA’s Glenn Research Center in Cleveland.Credit: NASA In addition to decreasing drag by conforming to the shape of aircraft, aerogel antennas save weight and space and come with the ability to adjust their individual array elements to reduce signal interference. They are also less visually intrusive compared to other types of antennas, such as spikes and blades. The finished product looks like a honeycomb but lays flat on an aircraft’s surface.
In the summer of 2024, researchers tested a rigid version of the antenna on a Britten-Norman Defender aircraft during an in-flight demonstration with the U.S. Navy at Naval Air Station Patuxent River in Maryland.
A Britten-Norman Defender aircraft outfitted with an advanced phased array antenna prototype for a flight test in summer 2024. The aircraft was used to verify data transmission quality and communications link resiliency with a low Earth orbit satellite.Credit: U.S. Navy Then, last October, researchers at NASA Glenn and the satellite communications firm Eutelsat America Corp., of Houston, began ground testing a version of the antenna mounted to a platform. The team successfully connected with a Eutelsat satellite in geostationary orbit, which bounced a signal back down to a satellite dish on a building at Glenn. Other demonstrations of the system at Glenn connected with a constellation of communications satellites operated in low Earth orbit by the data relay company Kepler. NASA researchers will design, build, and test a flexible version of the antenna later this year.
“This is significant because we are able to use the same antenna to connect with two very different satellite systems,” said Glenn researcher Bryan Schoenholz. Low Earth orbit satellites are relatively close – at 1,200 miles from the surface – and move quickly around the planet. Geostationary satellites are much farther – more than 22,000 miles from the surface – but orbit at speeds matching the Earth’s rotation, so they appear to remain in a fixed position above the equator.
NASA Glenn Research Center’s Sarah Dever and Mick Koch, electrical engineers, command an active phased array antenna to point toward a geostationary satellite. They used a flat version of an aerogel antenna during tests in October 2024.Credit: NASA/Jordan Cochran The satellite testing was crucial for analyzing the aerogel antenna concept’s potential real-world applications. When modern aircraft communicate with stations on the ground, those signals are often transmitted through satellite relays, which can come with delays and loss of communication. This NASA-developed technology will make sure these satellite links are not disrupted during flight as the aerogel antenna’s beam is a concentrated flow of radio waves that can be electronically steered with precision to maintain the connection.
As new types of air transportation options are brought to the market and U.S airspace – from the small, piloted aircraft of today to the autonomous air taxis and delivery drones of tomorrow – these kinds of steady connections will become increasingly important. That’s why NASA’s Advanced Air Mobility mission and Transformative Aeronautics Concepts program are supporting research like the aerogel antennas that can boost industry efforts to safely expand the emerging marketplace for these transportation systems.
“If an autonomous air taxi or drone flight loses its communications link, we have a very unsafe situation,” Schoenholz said. “We can’t afford a ‘dropped call’ up there because that connection is critical to the safety of the flight.”
Schoenholz, Vivod, and others work on NASA’s Antenna Deployment and Optimization Technologies activity within the Transformational Tools and Technologies project. The activity aims to develop technologies that reduce the risk of radio frequency interference from air taxis, drones, commercial passenger jets, and other aircraft in increasingly crowded airspace.
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By Space Force
U.S. Space Force Chief of Space Operations Gen. Chance Saltzman spoke to hundreds of cadets and national leaders during the 2025 National Conclave for Arnold Air Society and Silver Wings, emphasizing the evolving role of the Space Force in the future fight.
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By NASA
Exploring the unknown and preparing for humanity’s next giant leap really works up an appetite. Thankfully, employees at NASA’s Johnson Space Center in Houston can count on Tina Preyan to help them fuel up and stay focused.
Preyan is a food service specialist at Starport, a quality-of-life program that contributes to Johnson’s mission by providing employee services and activities that enhance work life and promote mental well-being and physical fitness. Part of the agency’s network of 12 NASA Exchanges — each located at a NASA center or facility — Starport offers everything from group fitness classes to retail shopping, with programs designed to engage, energize, and support the workforce.
Tina Preyan supports a NASA Exchange display at a Johnson Space Center event. Image courtesy of Tina Preyan Preyan oversees the on-site dining options at Johnson, from its cafés and food trucks to vending machines and mini markets. She helps set the budget for food services, creates monthly calendars of food offerings, schedules vendors and pop-up events, and ensures annual food safety inspections are conducted. She also works with teams across Johnson to order food and related supplies for NASA events.
“The best part of my job is working in customer service, meeting new NASA workers every day, and making everyone feel welcome and at home when coming to Johnson’s cafés,” she said.
Preyan has been a fixture at Johnson for the last 19 years. She previously worked at NASA’s Michoud Assembly Facility in New Orleans but transferred to Houston shortly after Hurricane Katrina hit the city in 2005. At Starport, she worked her way up from prep cook to lead cashier and then to lead assistant. She also served as the office’s administrative assistant before transitioning to her current role.
Tina Preyan poses for a photo with NASA astronauts Jessica Watkins and Victor Glover. Image courtesy of Tina Preyan Preyan has enjoyed meeting many NASA astronauts and Johnson team members and learning more about the work they do. The occasional celebrity sighting is another job perk.
Preyan is something of a celebrity herself. “So many employees know my name. I am proud of meeting so many people, and the love they give me every day just being here,” she said.
She was also proud to receive Starport’s Jackie Kingery Award in fall 2024. The award recognizes extraordinary customer service and exemplary dedication to the NASA Exchange mission at Johnson. “It felt amazing to receive this award and know that I am doing a great job in everyone’s eyes,” she said. “I value high integrity and am always willing to help others in the organization.”
Tina Preyan receives Starport’s Jackie Kingery Award from Starport Deputy Operations Manager Sam Miller in October 2024. Image courtesy of Tina Preyan Another source of pride for Preyan? Her son, Cameron, who is set to graduate from the University of Texas at San Antonio in May with a degree in Finance and Marketing.
In addition to her son’s graduation, Preyan looks forward to continuing her work in a positive environment and pursuing more growth opportunities.
“I’m going to stay busy and stay focused on ensuring proper procedures are being used by vendors,” she said. “And making sure all customers are happy and will continue to return to cafés.”
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By NASA
Since joining NASA in 2017 as a contractor supporting the International Space Station, Caroline Cawthon has held many roles supporting real-time operations as a certified flight controller, team lead, and lead systems engineer.
Caroline Cawthon’s official NASA portrait. NASA is one of the biggest most impressive networks of engineering, science, and space program expertise in the world and to not leverage that experience in mentorship would be a waste.
Caroline Cawthon
CLDP Engineering and Integration Lead
Now, she is supporting America’s future in orbit as the systems engineering and integration lead for NASA’s Commercial Low Earth Orbit Development Program engineering technical authority. Cawthon supports the program’s chief engineer office. In this position, she plays a key role in the oversight of phase 1 partner requirements and processes as part of the program’s two-phase approach to support the development of commercial space stations.
Growing up in military and NASA communities, Cawthon was fascinated with aviation and aerospace from a young age and aspired to become a fighter pilot and engineer. She first met an astronaut while attending Space Camp at the Euro Space Center in Belgium, sparking her interest in human spaceflight and solidifying her goals to work for NASA, make an impact, and be a part of making history. She later earned her bachelor’s degree in chemical and materials engineering and her master’s degree in aeronautics and space systems.
Cawthon attending Space Camp as a child at the Euro Space Center in Belgium. Image courtesy of Caroline Cawthon Cawthon describes the best part of her day as the people she works with, and her passionate and mission-driven team reminds her that the mission she’s working toward will make a difference in the future of human spaceflight.
“Between the program, engineering team, and our industry partners, there are thousands of years of experience with human spaceflight that I get to leverage every day to learn and grow in my role and to help NASA accomplish our mission,” shared Cawthon.
A recent example of this mission-driven teamwork was the development of the program’s technical standards design evaluation document. As the lead for this task, Cawthon was proud of how everyone’s hard work and contributions came together.
The biggest lesson Cawthon has learned while working with NASA is to continue being curious, learning, and growing both personally and professionally.
“NASA is one of the biggest most impressive networks of engineering, science, and space program expertise in the world and to not leverage that experience in mentorship would be a waste,” Cawthon said.
Cawthon pictured with her husband and daughter. Image courtesy of Caroline Cawthon Outside of work, Cawthon enjoys spending time outdoors with her husband and daughter. She and her family also like to be on the road, exploring new places and meeting new people. They enjoy international travel and small weekend adventures like the local zoo and aquarium.
Learn more about NASA’s Commercial Low Earth Orbit Development Program at:
Commercial Space Stations
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