NASA fired up RS-25 engine No. 20001 at the Fred Haise Test Stand at NASA’s Stennis Space Center at Bay St. Louis, ...

The Artemis II RS-25 engine, evolved from the Space Shuttle Main Engines. L3Harris has produced four RS-25 engines for the SLS core stage, with plans to manufacture additional engines for future ...

NASA has installed all four RS-25 engines onto the Artemis II Space Launch System core stage, completing a major assembly ...

There’s probably a month or so left until the Artemis II mission gets going, sending humans to the Moon for the first time in more than half a century. The hardware tasked with accomplishing the ...

Watch how the Space Launch System rocket RS-25 undergoes a core stage engine test-fire. Credit: NASA's Stennis Space Center ...

"We start building the engines from the raw material," Mark Aldaba told NBC Los Angeles, walking through the machining, ...