Countdown To NASA's Historic Lunar Mission On Hold At T-40 Minutes

Tens of thousands of people -- including US Vice President Kamala Harris -- are expected to gather along the beach to watch the launch, which has been decades in the making.

NASA's most powerful rocket yet is set to blast off Monday on a mission to take humans back to the Moon, but fueling the spacecraft gave the US space agency trouble hours before the launch. The countdown clock is on a hold at T-40 minutes. The hydrogen team of the @NASA_SLS rocket is discussing plans with the #Artemis I launch director. Operational commentary continues at https://t.co/z1RgZwQkWS. pic.twitter.com/5J6rHVCe44

The countdown clock has been put on hold at T-40 minutes. The hydrogen team will discuss the plans with Artemis 1 launch director.