![All four RS-25 engines.](https://www.nasa.gov/wp-content/uploads/2023/03/em1_4engines3.jpg)
The Four RS-25 Engines that will Power SLS
All four RS-25 engines that will power SLS for its first flight are ready to be integrated with the rocket's core stage.
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https://www.nasa.gov/image-detail/four-rs-25-engines-that-will-power-sls/
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