What propulsion elements characterize the SLS Block 1 first stage design?
Answer
Two updated Space Shuttle Main Engines (RS-25s) with two five-segment Solid Rocket Boosters (SRBs)
The SLS Block 1 utilizes a modernized approach combining two RS-25 liquid engines with two five-segment Solid Rocket Boosters (SRBs) for its initial high thrust.

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