![A 2-percent scale model of the Space Launch System core stage RS-25 engines](https://www.nasa.gov/wp-content/uploads/2023/03/sls_model_1.png)
Mini Models Fire Up for SLS Base Heating Tests
A 2-percent scale model of the Space Launch System core stage RS-25 engines, in the pictures at left, and a model of the SLS without the twin boosters is used for nominal, core-stage-only testing at A 2-percent scale model of the Space Launch System core stage RS-25 engines at right.
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https://www.nasa.gov/image-detail/mini-models-fire-up-sls-base-heating-tests/
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