The most powerful rocket NASA has ever built, Artemis I, will launch an uncrewed test flight from the Kennedy Space Center in Cape Canaveral just after 8:30 Monday morning.
More than 100,000 are expected to watch the launch.
8:35 a.m.
NASA said the launch is scrubbed. The next launch window opens at 12L48 p.m. on Friday, September 2.
8:20 a.m.
Teams continue to hold the countdown at T-40 minutes while engineers evaluate why the bleed test to condition the engines was not successful, NASA said. The rocket and spacecraft are in stable, safe condition.
7:55 a.m.
Fuel leaks during final liftoff preparations threatened to postpone the launch of NASA's mighty new moon rocket Monday morning.
As precious minutes ticked away, NASA repeatedly stopped and started the fueling of the Space Launch System rocket with nearly 1 million gallons of super-cold hydrogen and oxygen because of a leak. The fueling was already running nearly an hour late because of thunderstorms off Florida's Kennedy Space Center.
7:30 a.m.
The countdown for liftoff is on-hold at 40 minutes, NASA said, while the hydrogen team discusses plans with the launch director.
6:23 a.m.
NASA said engineers are troubleshooting an engine conditioning issue. Teams are also assessing an apparent crack in one of the flanges on the core stage, which are connection joints that function like a seam on a shirt.
5:15 a.m.
All eyes are on the weather as final preparations continue.
5 a.m.
A fuel leak interrupted final preparations Monday morning. NASA said engineers troubleshot the leak and found that it was at an acceptable level. Fast fill operations were resumed.
