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Four Old Space Shuttle Engines Team Up For One Last Rocket Launch

by: Scott Manley Duration: 10:32

The first SLS core stage is complete, with 4 engines attached, 4 Engines which are older than the SLS program, indeed some of them are older than people working on the program. The first 4 launches will use the remaining 16 Block II engines built for the Space Shuttle - some of which have had long careers.