The space agency fired an RS-25 rocket engine for 500 seconds and tested it at 111% power at Stennis Space Center to support future Artemis Moon missions.Nasa conducts a hot fire test of RS-25 engine at Nasa's Stennis Space Center. Nasa has fired up one of its powerful RS-25 rocket engines in a major test aimed at preparing future missions to the Moon under its Artemis programme.The engine was fired for 500 seconds, or about eight-and-a-half minutes, matching the duration it must operate during a launch of the agency’s Space Launch System (SLS) rocket.The test took place on October 21, 2026, at Nasa’s Stennis Space Center in Mississippi, United States.Feel the Power of an RS25 Hot Fire Test!
We successfully tested RS-25 engine No. 10001 on Oct.
21 on the Fred Haise Test Stand at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.
The main objectives of the test were to acceptance test RS-25 flight components for future @NASAArtemis missions and validate the new thermal protection system, which protects the RS-25 engine nozzle from the thermal environment surrounding NASA’s SLS (Space Launch System) rocket during launch. While this developmental engine will not be used in flight, the hot fire test provides NASA and NASA's prime engine contractor @L3HarrisTech with the capability to capture critical data to improve engine performance and reliability.— Stennis Space Center (@NASAStennis) October 21, 2026Engineers also pushed the developmental engine to 111% of its rated power level, testing the performance required from newly manufactured engines that will help carry astronauts aboard the Orion spacecraft towards the Moon.
According to Nasa, the test was designed to check flight components intended for future Artemis missions and validate a new protective system for the engine nozzle, the part through which hot gases escape to generate thrust.The developmental engine itself will not fly in space. Instead, the test will provide engineers with data to improve the performance and reliability of engines intended for actual missions.WHAT IS RS-25 ENGINE AND WHY IS IT IMPORTANT?
The RS-25 is a liquid-fuel rocket engine that burns liquid hydrogen and liquid oxygen to produce the force needed to propel a rocket upwards. A close-up image of the RS-25 engine that was tested.
Four such engines are fitted to the core stage of Nasa’s SLS rocket, working together to generate about 9 million newtons of thrust during the rocket’s journey towards orbit.The engines have a history stretching back to the Space Shuttle programme, but they have been upgraded to meet the demands of the SLS rocket.The newer engines are designed to operate at higher thrust levels, while changes to their components and manufacturing processes aim to improve performance and reduce production costs.Every RS-25 engine intended for flight undergoes ground testing at Stennis before it can be cleared for a mission. A large plume of smoke is seen during the test of RS-25 engine.
PREPARING TO GO TO MOONNasa’s Artemis programme aims to return astronauts to the Moon and establish a longer-term human presence there, while building experience for future crewed missions to Mars.The SLS rocket and Orion spacecraft are central to that effort. SLS provides the power to send the spacecraft beyond Earth, while Orion carries astronauts on their journey.The latest engine test is part of the work needed to ensure that the rocket’s propulsion system can perform reliably under the extreme conditions of launch.By testing components and protective systems on the ground before flight, Nasa aims to reduce risks as it prepares for future missions. - Ends