SLS Core Stage Hot Fire Test Explained

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NASA will perform a hot fire test of the core stage of the Space Launch System (SLS) rocket on 16 January 2021, at NASA’s Stennis Space Center, Mississippi. During the test, the four RS-25 engines will fire to simulate the stage’s operation during launch. Jeff Zotti, RS-25 program director at Aerojet Rocketdyne, explains the hot fire test, the last of the Green Run test series.
Credit: NASA