NASA's heavy-lift Space Flight System rocket's maiden launch was postponed due to an engine cool-down problem. Mission management will try again on Saturday.
In the interim, engineers will figure up a go/no-go strategy in case they meet similar challenges as Monday.
Saturday's launch window begins at 11:17 a.m. PT (2:17 p.m. ET). NASA's uncrewed Artemis 1 mission aims to send humans to the moon in the mid-2020s.
Modify Saturday's countdown. Before fueling, mission managers cool the engine. "Bleeding" off liquid hydrogen fuel cools the core stage's four major engines to -420°F.
Mission management copied Stennis's technique.
John Honeycutt, NASA's SLS programme manager, stated the fault may be with the sensor.
Honeycutt added, "With the team's cooperation, I intend to put us in a circumstance that provides us the data we need to know that the engines are properly cooled and go fly."