NASA has called off the Artemis I mission's planned launch,
saying Monday morning that agency engineers needed more time to work out why one of four major engines on the Space Launch System rocket couldn't get to the needed temperature range for liftoff.
The agency scrubbed the mission shortly after the opening of the two-hour launch window, which had been set to begin at 8:33 a.m. ET Monday.
NASA had previously designated Sept. 2 and Sept. 5 as initial back-up dates for the flight.
Contingency plans for major launches are a necessity for NASA and commercial space operators.
Storm systems and challenging weather is common in Florida, for instance, and can pose hazards to space vehicles taking off from pads at the Kennedy Space Center.
NASA engineers are still trying to resolve a problem with one of the four engines installed on the main stage of the Space Launch System rocket, according to the agency’s livestream.