Engineers and technicians at NASA’s Michoud Assembly Facility in New Orleans have structurally mated the first of four RS-25 engines to the core stage for NASA’s Space Launch System (SLS) rocket that will help power the first Artemis mission to the Moon. Credit: NASA/Jude Guidry For SpaceUpClose.com & RocketSTEM KENNEDY SPACE CENTER, FL/MICHOUD ASSEMBLY FACILITY, LA – The first of