NASA Orders More SLS Megarockets from Boeing for Artemis Moon Missions

NASA finished assembling the main structural components for the first Space Launch System (SLS) rocket core stage at the Michoud Assembly Facility in New Orleans last month.
NASA finished assembling the main structural components for the first Space Launch System (SLS) rocket core stage at the Michoud Assembly Facility in New Orleans last month. (Image credit: NASA/MSFC)

NASA has extended Boeing's moon rocket assembly authorization in preparation to support as many as 10 moon missions for the agency's Artemis program (opens in new tab), which aims to land astronauts on the moon in 2024. 

On Wednesday (Oct. 16), NASA announced interim additional funding for Boeing — and an authorization to buy raw materials for rocket-building in bulk — as the company and NASA continue to negotiate a full contract for Artemis. The larger contract, which the agency plans to finalize next year, is expected to support up to 10 core stages of the Space Launch System (SLS) rocket, as well as eight Exploration Upper Stages (EUS). 

NASA currently has "no idea" how much funding it will give Boeing in the full contract, but that amount will be disclosed when the administration submits its next budget request in February, an agency spokesperson told This additional rocket manufacturing is part of the agency's push to land humans on the lunar surface in five years, in fulfillment of a directive (opens in new tab) from the administration of U.S. President Donald Trump.

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"It is urgent that we meet the President's goal to land astronauts on the Moon by 2024, and SLS is the only rocket that can help us meet that challenge," NASA Administrator Jim Bridenstine said in a statement (opens in new tab)

"These initial steps allow NASA to start building the core stage that will launch the next astronauts to set foot on the lunar surface, and build the powerful exploration upper stage that will expand the possibilities for Artemis missions by sending hardware and cargo — along with humans or even heavier cargo — needed to explore the moon or Mars."

Boeing already has a contract to build the SLS core stages for the Artemis 1 and Artemis 2 missions, and the first EUS for Artemis 4, among other components. Artemis 1 is expected to fly an uncrewed spacecraft around the moon and back no earlier than mid-2020 (opens in new tab), while Artemis 2 will be the first crewed mission (a lunar flyby without a landing), which NASA is currently aiming to launch in 2022.

The agency said the new money will be used for Boeing to start building the third SLS core stage, and to do bulk orders of materials that will be used to build rockets for subsequent missions to save money. The third core stage is expected to fly on Artemis 3, which is scheduled to bring astronauts to the lunar surface.

This NASA infographic explains the core stage of the Space Launch System rocket. (Click the top right corner to expand.) (Image credit: NASA MSFC)

NASA said the new contract is expected to save money because the SLS will be made in a production line, rather than as one-off builds. Boeing can use the "lessons learned" from creating earlier rockets to save money and time, potentially, on the later builds, NASA officials said in the statement. 

The needs of NASA will change as Boeing's expected production of SLS rockets continues beyond the first three Artemis missions. While the earliest stages of the program will use an interim cryogenic propulsion stage to bring the Orion spacecraft to the moon, Artemis 4 and later missions will use the more powerful EUS. The EUS will be used to send larger cargo along with an astronaut crew — or dedicated cargo-only missions — to the moon, Mars and possibly other destinations in the solar system.

NASA added that work is "well underway" for both the Artemis 1 and 2 rockets, since the core stage assembly for both is almost finished at NASA's Michoud Assembly Facility in New Orleans. The next major scheduled tasks for Artemis 1's preparation include test-firing the core stage's four RS-25 engines (opens in new tab) at NASA's Stennis Space Center in Mississippi, and then building the entire rocket at NASA's Kennedy Space Center in Florida ahead of the launch.

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell, Ph.D., is a staff writer in the spaceflight channel since 2022. She was contributing writer for (opens in new tab) for 10 years before that, since 2012. Elizabeth's reporting includes an exclusive with Office of the Vice-President of the United States, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and (soon) a Bachelor of History from Athabasca University. Elizabeth is also a post-secondary instructor in communications and science since 2015. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: