This video animation shows how the forward join — or upper part — of the core stage was assembled for NASA’s Space Launch System (SLS), America’s new deep space rocket. The forward join connects three structures: the liquid oxygen tank, intertank and forward skirt. The forward join is the first of three major assembly jobs required by NASA and Boeing, the SLS prime contractor, to complete the massive, 212-foot-tall SLS core stage. Assembly of the stage, which will be the largest rocket stage ever produced, takes place at NASA’s Michoud Assembly Facility in New Orleans.

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