After a delay, the next launch opportunity for NASA's giant moon rocket is Friday

NASA's Artemis I moon rocket sits at Launch Pad Complex 39B at Kennedy Space Center in Cape Canaveral, Fla., in June. (Eva Marie Uzcategui/AFP via Getty Images)

NASA's hopes for a Monday launch of the massive Space Launch System rocket from the Kennedy Space Center on a test flight to the moon are on hold for at least a few days after engineers were unable to resolve an engine problem.

One of the four SLS core-stage engines failed to reach the proper temperature for launch, prompting the Artemis I mission's launch director to scrub the planned Monday morning liftoff.