NASA

NASA Stennis runs 500-second RS-25 engine test

NASA teams conducted a hot-fire test of RS-25 engine No. 10001 at Stennis Space Center near Bay St. Louis, Mississippi, on October 21, 2026. Running at a 111% power level, the test lasted 500 seconds, nearly eight and a half minutes. That duration matches how long RS-25 engines fire during a launch of NASA’s SLS rocket.

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NASA Stennis runs 500-second RS-25 engine test
Image source · NASA

What to know

  • 01

    The test took place at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.

  • 02

    RS-25 engine No. 10001 underwent a 500-second hot-fire test at a 111% power level.

Why it matters

The matching engine firing duration offers a point of reference for understanding this test’s connection to SLS launches.

Original sourceRead the source · NASAwww.nasa.gov

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