The National Aeronautics and Space Administration (NASA) has successfully completed extended hot-fire tests of its powerful RS-25 engine at its Stennis Space Center in Mississippi. This milestone is a critical step in preparing for future missions, particularly the Artemis program, which aims to return humans to the Moon.
Power and Duration of Tests
During the tests conducted on October 21, 2026, RS-25 engine serial number 10001 operated for 500 seconds (approximately eight and a half minutes). This duration matches the expected time the RS-25 engines will fire during an actual launch of the Space Launch System (SLS) rocket. The tests were performed at 111% of nominal power, demonstrating high levels of reliability and performance. For each Artemis mission, four RS-25 engines will collectively generate up to 2 million pounds of thrust, essential for lifting the heavy-lift SLS rocket into orbit.
Importance for Future Missions
While this specific test engine will not fly to space, its successful testing allows NASA and prime contractor L3Harris Technologies to gather vital data. This information is aimed at further refining the performance and reliability of the RS-25 engines. Prior to every flight, all RS-25 engines undergo thorough flight readiness verification at Stennis, ensuring the safety and success of NASA’s most ambitious space expeditions.
Source: NASA
