A view of one of the RS-25 engines on the Space Launch System rocket as seen from the zero deck of the mobile launcher inside the Vehicle Assembly Building on Aug. 16, 2021. Four RS-25 engines will fire for over eight minutes at liftoff of the Artemis I mission to help get the Orion spacecraft to orbit. Artemis I will be an uncrewed test of the Orion spacecraft and SLS rocket as an integrated system ahead of crewed flights to the Moon. Under Artemis, NASA aims to land the first woman and first person of color on the Moon and establish sustainable lunar exploration.