STENNIS SPACE CENTER, Miss., Nov. 12, 2025 — NASA and L3Harris Technologies (NYSE: LHX) have successfully test-fired the second RS-25 engine that will support the core stage of the Space Launch System (SLS) rocket for NASA’s Artemis V mission.
L3Harris’ RS-25 rocket engines are critical to the Artemis program’s success, with four RS-25s powering every SLS rocket, enabling the U.S. to help establish a sustainable presence on the moon and prepare for future missions to Mars.
“As we approach America’s 250th anniversary next year, it’s fitting that we’re advancing the Artemis program that embodies the pioneering spirit of our nation,” said Kristin Houston, President, Space Propulsion and Power Systems, Aerojet Rocketdyne, L3Harris. “By leveraging advanced manufacturing techniques, we’re delivering engines that are more cost effective while maintaining the power and reliability needed to propel Artemis missions to the Moon and beyond.”
NASA conducted the test at its Stennis Space Center, which demonstrated the engine’s performance and reliability during a 500-second firing that reached 111% of its rated power level. This test marked the second flight-ready RS-25 engine produced using modern manufacturing techniques, including 3D printing, which reduce production costs by 30% compared to earlier RS-25 engines that powered the space shuttle.
The first four Artemis missions use upgraded RS-25 engines originally designed for the space shuttle program, while the fifth mission will debut the newly produced RS-25 engines.
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