A closer look at “NASA Stennis Completes Full-Duration RS-25 Engine Test for SLS Rocket”, exactly as the source publishes it. NASA’s Stennis Space Center in Mississippi conducted a critical hot fire test of RS-25 engine No. 21, 2026, running it for nearly eight-and-a-half minutes at 111% power. That duration matches the burn time required for the Space Launch System (SLS) rocket during launch, marking a key step in certifying engines for future Artemis missions.
Louis facility validates performance and reliability of the engine originally designed for the Space Shuttle but now adapted for the more powerful SLS. By pushing beyond the standard 100% thrust level, engineers gather data on how the engine handles increased stress, ensuring it can meet the demands of deep space exploration. This milestone supports NASA’s goal of returning humans to the Moon and eventually sending crews to Mars, as each successful test brings the SLS closer to operational readiness. This listing links straight to the original page, where the content is available in full.