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A massive cloud of white vapor billows out from a structure where an RS-25 engine is firing. The flames are just barely visible through the structure. In the foreground is a body of water.

RS-25 Engine Tests at NASA Stennis

Teams at NASA’s Stennis Space Center near Bay St. Louis, Mississippi tested RS-25 engine No. 10001 on Oct. 21, 2026.

Image Credit: NASA/Danny Nowlin

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TakenOctober 21, 2026
Image CreditNASA/Danny Nowlin
Size5568x3712px