In preparation for a manned mission to the moon by the decade's end, NASA is set to launch the mission's first stage.
A gigantic unmanned rocket is scheduled to blast off from Kennedy Space Center on Monday morning.
Orbit the moon on a path that takes it far into space, and then return to Earth 42 days later.
NASA and the space industry have reached a pivotal juncture with the launch of Artemis I.
The goal of the Artemis programme is to send a woman and a person of colour to the moon as soon as 2025.
Artemis is the Greek mythological sister of Apollo.