NASA Artemis SLS RS‑25 Moon Rocket Engine Install Day | Stennis Space Center

NASA Artemis SLS RS‑25 Moon Rocket Engine Install Day | Stennis Space Center

On Sept. 29, 2026, teams at NASA's Stennis Space Center near Bay St. Louis, Mississippi, successfully lifted and installed developmental RS‑25 engine No. 10001 onto the Fred Haise Test Stand for an upcoming hot fire test.

In this video, Josh Greiner, test director for the stand, walks you through what a developmental engine is, and how testing supports NASA's Artemis missions.

Did you know?

• For each Artemis mission, four RS-25 engines, along with a pair of solid rocket boosters, power NASA’s Space Launch System (SLS) rocket to produce more than 8.8 million pounds of total combined thrust at liftoff. 

• All RS-25 engines are built by L3Harris Technologies for Artemis missions. The engines are tested and proven flightworthy at NASA Stennis prior to use. 

• Hot fires at NASA Stennis provide critical performance data to ensure safety and success.

All RS-25 engines are tested and proven flightworthy at NASA Stennis. The test was conducted by a team of operators from NASA, L3Harris, and Syncom Space Services, prime contractor for site facilities and operations.

RS-25 engines are evolved space shuttle main engines, upgraded with new components to produce the additional power needed to help launch NASA’s SLS rocket. The first four Artemis missions are using modified space shuttle main engines also tested at NASA Stennis. For each Artemis mission, four RS-25 engines, along with a pair of solid rocket boosters, power the SLS rocket, producing more than 8.8 million pounds of total combined thrust at liftoff.

Learn about the Artemis program and America's return to the Moon: https://www.nasa.gov/humans-in-space/artemis/

Video Credit: NASA's John C. Stennis Space Center
Duration: 3 minutes, 19 seconds
Release Date: Oct. 7, 2026

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