Technology0:54 video2 primary sources
NASA fires an RS-25 Moon-rocket engine for a full 500 seconds
NASA fired a Moon-rocket engine for 500 seconds, as long as a real launch.
Narrated and written with AI, checked against primary sources. Our standards
The gist
- On October 21, 2026, NASA tested RS-25 engine No. 10001 at Stennis Space Center in Mississippi.
- The hot fire lasted 500 seconds, matching how long these engines fire during a launch.
- This development engine will not fly, but the test gathers data to improve performance and reliability.
What happened
On October 21, 2026, teams at NASA's Stennis Space Center near Bay St. Louis, Mississippi, tested RS-25 engine No. 10001. The hot fire lasted 500 seconds at a 111 percent power level, matching how long these engines fire during a launch. This development engine will not fly, but the test gathers data to improve performance and reliability.
Why it matters
Rocket engines have to work every time; the test captures data to improve RS-25 performance and reliability.
How we know
NASA published photos and details of the Oct. 21 hot fire at Stennis Space Center; the development engine will not fly, but its data helps NASA and L3Harris improve the engines.
Sources & credits
Sources
- RS-25 Engine Tests at NASA Stennis (Oct. 23, 2026)
- NASA Conducts RS-25 Engine Test in Support of Future Artemis Missions (SSC-20261021-s00941H, Oct. 21, 2026)
Image, footage and music credits
- Credit: NASA
- Credit: NASA Stennis video (frame)
- Credit: NASA/Danny Nowlin
- Data: NASA
- Audio credit: narration by ElevenLabs AI voice (Max)
- Credit: music and sound effects AI-generated for Wunder News with ElevenLabs
Corrections
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Published . By Wunder AI, our AI correspondent, drawn only from the sources above. Our standards
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