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NASA Prepares Artemis II Moon Rocket Core Stage for Final Assembly Phase


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These photos and videos show how technicians at NASA’s Michoud Assembly Facility in New Orleans installed the third and fourth RS-25 engines onto the core stage for the agency’s SLS (Space Launch System) rocket that will help power NASA’s first crewed Artemis mission to the Moon.   Technicians added the first engine to the SLS core stage Sept. 11. The second engine was installed onto the stage Sept. 15 with the third and fourth engines following Sept. 19 and Sept. 20. Engineers consider the engines to be “soft” mated to the rocket stage. Technicians with NASA, Aerojet Rocketdyne, an L3Harris Technologies company and the RS-25 engines lead contractor, along with Boeing, the core stage lead contractor, will now focus efforts on the complex tax of fully securing the engines to the stage and integrating the propulsion and electrical systems within the structure.   NASA is working to land the first woman and first person of color on the Moon under Artemis. SLS is part of NASA’s backbone for deep space exploration, along with Orion and the Gateway in orbit around the Moon. SLS is the only rocket that can send Orion, astronauts, and supplies to the Moon in a single mission.
All four RS-25 engines have been installed onto the SLS (Space Launch System) core stage for NASA’s Artemis II mission. The installation of the engines signals the core stage is nearly finished with assembly and will soon be ready for shipment to NASA’s Kennedy Space Center in Florida. During launch, the rocket’s engines provide more than two million pounds of combined thrust.
Credits: NASA

By Megan Carter

NASA and its partners have fully secured the four RS-25 engines onto the core stage of the agency’s SLS (Space Launch System) rocket for the Artemis II flight test. The core stage, and its engines, is the backbone of the SLS mega rocket that will power the flight test, the first crewed mission to the Moon under Artemis.

Engineers have begun final integration testing at NASA’s Michoud Assembly Facility in New Orleans, in preparation for acceptance ahead of shipment of the stage to Kennedy Space Center in Florida in the coming months.

“NASA integrated many lessons learned from the first-time build and assembly of the SLS core stage for Artemis I to increase efficiencies during manufacturing and cross-team collaboration with our partners for Artemis II. NASA teams in New Orleans remain focused on assembling and preparing the SLS rocket’s liquid-fueled stage to support the flight.”

Julie Bassler

Julie Bassler

Manager of the Stages Office for the SLS Program

“NASA integrated many lessons learned from the first-time build and assembly of the SLS core stage for Artemis I to increase efficiencies during manufacturing and cross-team collaboration with our partners for Artemis II,” said Julie Bassler, manager of the Stages Office for the SLS Program at the agency’s Marshall Space Flight Center in Huntsville, Alabama, where the program is managed. “NASA teams in New Orleans remain focused on assembling and preparing the SLS rocket’s liquid-fueled stage to support the flight.”

The 212-foot-tall core stage includes two massive liquid propellant tanks and four RS-25 engines at its base. For Artemis II, the core stage and its engines act as the powerhouse of the rocket, providing more than two million pounds of thrust for the first eight minutes of flight to send the crew of four astronauts inside NASA’s Orion spacecraft on an approximately 10-day mission around the Moon.

NASA, Aerojet Rocketdyne, an L3Harris Technologies company and the RS-25 engines lead contractor, along with Boeing, the core stage lead contractor, secured the engines to the maze of propulsion and avionics systems within the core stage Oct. 6. In the coming weeks, engineers will perform testing on the entire stage and its avionics and electrical systems, which act as the “brains” of the rocket to help control it during flight.

Once testing of the stage is complete and the hardware passes its acceptance review, the core stage will be readied for shipping to Kennedy via the agency’s Pegasus barge, based at Michoud.

As teams prepare the core stage for Artemis II, rocket hardware is also under construction on our factory floor for Artemis III, IV, and V that will help send the future Artemis astronauts to the lunar South Pole.

The engines were first soft mated one by one onto the stage beginning in early September. The last RS-25 engine was structurally installed onto the stage Sept. 20. Installing the four engines is a multi-step, collaborative process for NASA, Boeing, and Aerojet Rocketdyne.

Following the initial structural connections of the individual engines, securing and outfitting all four engines to the stage is the lengthiest part of the engine assembly process and includes securing the thrust vector control actuators, ancillary interfaces, and remaining bolts before multiple tests and checkouts.

All major hardware elements for the SLS rocket that will launch Artemis II are either complete or in progress. The major components for the rocket’s two solid rocket boosters are at Kennedy. The rocket’s two adapters, produced at Marshall, along with the rocket’s upper stage, currently at lead contractor United Launch Alliance’s facility in Florida near Kennedy, will be prepared for shipment in the spring.

NASA is working to land the first woman and first person of color on the Moon under Artemis. SLS is part of NASA’s backbone for deep space exploration, along with Orion and the Gateway in orbit around the Moon, and commercial human landing systems. SLS is the only rocket that can send Orion, astronauts, and supplies to the Moon in a single mission.

Corinne Beckinger
Marshall Space Flight Center, Huntsville, Ala.
256.544.0034
corinne.m.beckinger@nasa.gov

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      Left: Neil A. Armstrong at his hometown parade in Wapakoneta, Ohio. Image credit: Ohio Historical Society. Middle: Edwin E. “Buzz” Aldrin at his hometown parade in Montclair, New Jersey. Image credit: Star-Register. Right: Michael Collins at his adopted hometown parade in New Orleans, Louisiana. Image credit: AP Photo.
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      Left: Apollo 11 astronauts Michael Collins, left, Neil A. Armstrong, and Edwin E. “Buzz” Aldrin with Postmaster General Winton M. Blount display an enlargement of the stamp commemorating the first Moon landing. Right: Aldrin, left, Collins, and Armstrong examine a Moon rock with Smithsonian Institution Director General of Museums Frank A. Taylor.
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      Sen. Shelly Moore Capito (R-WV), delivers remarks during a Congressional Gold Medal ceremony recognizing NASA’s Hidden Figures, Wednesday, Sept. 18, 2024, in Emancipation Hall at the U.S. Capitol in Washington. Credits: NASA/Joel Kowsky A simple turn of phrase was all it took for U.S. Sen. Shelley Moore Capito of Katherine Johnson’s home state of West Virginia to capture the feeling in Emancipation Hall at the U.S. Capitol in Washington.
      “It’s been said that Katherine Johnson counted everything,” she said. “But today we’re here to celebrate the one thing even she couldn’t count, and that’s the impact that she and her colleagues have had on the lives of students, teachers, and explorers.”
      That sense of admiration and awe toward the legacy and impact of NASA’s Hidden Figures was palpable Wednesday during a Congressional Gold Medal Ceremony to honor the women’s work and achievements during the space race.
      The Congressional Gold Medal in recognition of Katherine Johnson in recognition of her service to the United States as a Mathematician is seen during a ceremony recognizing NASA’s Hidden Figures, Wednesday, Sept. 18, 2024, in Emancipation Hall at the U.S. Capitol in Washington.  Katherine Johnson’s family accepted this gold medal on her behalf.NASA/Joel Kowsky The ceremony, hosted by House Speaker Mike Johnson, honored Johnson, Dorothy Vaughan, Mary Jackson, and Dr. Christine Darden of NASA’s Langley Research Center in Hampton, Virginia, along with all the other women who served at the agency and its precursor, the National Advisory Committee for Aeronautics, or the NACA, as computers, mathematicians, and engineers.
      “The pioneers we honor today, these Hidden Figures — their courage and imagination brought us to the Moon. And their lessons, their legacy, will send us back to the Moon,” said NASA Administrator Bill Nelson.
      Margot Lee Shetterly, whose 2016 nonfiction book “Hidden Figures: The American Dream and the Untold Story of the Black Women Who Helped Win the Space Race,” brought awareness to the stories of NASA’s human computers, spoke at the event.NASA/Joel Kowsky Author Margot Lee Shetterly detailed the stories of the women from NASA Langley in her 2016 nonfiction book “Hidden Figures: The American Dream and the Untold Story of the Black Women Who Helped Win the Space Race.” Though the book focused on NASA Langley, where Shetterly’s father worked, it helped raise awareness of similar stories around NASA.
      A film adaptation of the book starring Taraji Henson as Johnson, Octavia Spencer as Vaughan, and Janelle Monáe as Jackson came out later that year and further elevated the topic. NASA participated under a Space Act Agreement with 20th Century Fox in activities around the movie, to provide historical guidance and advice during the filmmaking process.
      In her remarks, Shetterly noted that even as the Hidden Figures made such key contributions to NASA and the NACA before it, they remained active in their communities, leading Girl Scout troops and delivering meals to the hungry.
      “They spent countless hours tutoring kids so that those kids, too, would see the power and the beauty of numbers they believed in, tending to the small D democracy that binds us to each other as neighbors and as American citizens,” she said.
      The medal citations were as follows:
      Congressional Gold Medal to Katherine Johnson, in recognition of her service to the United States as a mathematician Congressional Gold Medal to Dr. Christine Darden, for her service to the United States as an aeronautical engineer Congressional Gold Medals in commemoration of the lives of Dorothy Vaughan and Mary Jackson, in recognition of their service to the United States during the space race Congressional Gold Medal in recognition of all the women who served as computers, mathematicians, and engineers at the National Advisory Committee Family members of Johnson, Vaughn, Jackson and Dr. Darden accepted medals on their behalves. Dr. Darden watched the ceremony from home.
      House Speaker Mike Johnson and Andrea Mosie, senior Apollo sample processor and lab manager who oversees the 842 pounds of Apollo lunar samples. Mosie accepted the medal awarded in recognition of all the women who served as computers, mathematicians, and engineers at the National Advisory Committee for Aeronautics and NASA between the 1930s and the 1970s.NASA/Joel Kowsky Andrea Mosie, senior Apollo sample processor and lab manager who oversees the 842 pounds of Apollo lunar samples, accepted the medal awarded to all NASA’s Hidden Figures. She began her career at NASA’s Johnson Space Center in Houston in the 1970s.
      Mosie thanked Congress for supporting NASA’s campaign to send the first woman and first person of color to the Moon as part of Artemis and the agency’s efforts to provide “opportunities for people, more representative of the way our country looks, to understand humanity’s place in the universe.”
      Several NASA Langley officials attended the event to honor the legacies of the women who worked there.
      “I am humbled by the significant contributions and lasting impact of these women to America’s aeronautics and space programs. Their brilliance and perseverance still echo not just through the halls of NASA Langley, but through the entire Agency,” said NASA Langley’s Acting Center Director Dawn Schaible. “They are an inspiration to me and countless others who have benefited from the paths they forged.”
      Rep. Eddie Bernice Johnson of Texas, who passed away in 2023, introduced H.R. 1396 – Hidden Figures Congressional Gold Medal Act on Feb. 27, 2019. It was signed into law later that year.
      In 2015, President Barack Obama presented Katherine Johnson with the Presidential Medal of Freedom, the nation’s highest civilian honor.
      Brittny McGraw and Joe Atkinson
      NASA Langley Research Center
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      But it wasn’t just any science class. It was one specially designed for English learners.
      “I was born and raised in Guatemala,” Pereira said. “I came here at 14 unable to speak any English.”
      Pereira did not know how to navigate the U.S. educational system either, but after that class, he was certain he wanted a career in space.
      Thus began a journey that ultimately landed him at L3Harris Technologies, where he works in the Aerojet Rocketdyne segment as an engineer and operations integrator on the RS-25 engine – used to power the core stage of NASA’s SLS (Space Launch System) rocket that will launch astronauts to the Moon under NASA’s Artemis campaign.
      Pereira’s first step was to stay after class and ask to borrow a copy of the video on black holes. His teacher not only obliged but took him across the street to the local library to get his first library card.
      Pereira quickly recognized that the pathway to his desired career in space was through higher education. It was equally clear, however, that he was not yet on that pathway. English as a Second Language classes, including that science class, did not count toward college admissions. His guidance counselor, meanwhile, was nudging him toward the trades.
      But with the help of teachers and a new guidance counselor, he got himself on the college-bound track.
      “I came to understand there were multiple career pathways to explore my interest in space,” Pereira said “One was engineering.”
      There was a lot of catching up to do, so Pereira took eight classes per day, including honors courses. He also worked every day after school cleaning a gymnasium from 6 to 11 p.m. to help his family make ends meet.
      Pereira earned his mechanical engineering degree at California State University at Los Angeles while also working as a senior educator at the California Science Center to cover the cost of his college tuition and living expenses.
      Pereira’s first career experience was as an intern in manufacturing engineering at Aerojet Rocketdyne. “I learned that making 100% mission-success engines requires a strong culture of attention to detail, teamwork and solid work ethics.” Pereira said. His first full-fledged engineering job was with Honeywell Aerospace working on aircraft programs.
      Eventually, space came calling — literally. “My mentor at Aerojet Rocketdyne called me up and said, ‘Chris, I have a job for you,’” Pereira said.
      He began his new job working on rocket engine programs including the AR1 and RS-68 but shifted to the RS-25 after NASA awarded Aerojet Rocketdyne a contract for newly manufactured versions of the engine. Initial versions of the SLS are using refurbished engines from the Space Shuttle Program. Evolved versions of the RS-25 recently concluded a critical test series and will debut with the fifth Artemis flight.
      As RS-25’s operations integrator, Pereira is responsible for ensuring that the many pieces of the program – from tracking on-time procurement of supplies and labor loads to coordinating priorities on various in-demand machine centers – come together to deliver a quality product.
      Playing a key role in the nation’s effort to return astronauts to the Moon feels a bit like coming home again, Pereira said. “You develop your first love, work really hard, take different pathways and encounter new passions,” he said. “It’s almost funny how the world and life work out – it’s like I’ve taken a big circle back to my first love.”
      NASA is working to land the first woman, first person of color, and its first international partner astronaut on the Moon under Artemis. SLS is part of NASA’s backbone for deep space exploration, along with the Orion spacecraft, supporting ground systems, advanced spacesuits and rovers, the Gateway in orbit around the Moon, and commercial human landing systems. SLS is the only rocket that can send Orion, astronauts, and supplies to the Moon in a single launch.
      Read other I am Artemis features.
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