After years of delay, NASA plans to roll its massive new SLS moon rocket out of the historic Vehicle Assembly Building and onto it's launch pad for the first time Thursday.

The rollout will be the first time a NASA rocket so large -- 322 feet tall -- has moved to a launch pad since Apollo 17's Saturn V rocket did so before launching astronauts to the moon in 1972.

Space shuttles also made the same roll from the VAB to the launch pad from 1981 to 2011, but the new moon rocket will tower above the shuttle height, which was 184 feet when stacked on its large exterior fuel tank.

Thursday's events are to include a fully fueled rehearsal for an uncrewed launch to a lunar orbit planned for no earlier than May.

NASA plans a press conference at 5:30 p.m. EDT on Monday after completion of a test readiness review.

The rocket and Orion capsule will roll slowly to Launch Complex 39B, about four miles away. The space agency expects the journey to last six to 12 hours.

The Artemis I mission is to fly further past the moon than any spacecraft designed for humans in history.

NASA plans live coverage of the rollout beginning at 5 p.m. EDT on Thursday, including live remarks from NASA Administrator Bill Nelson and other guests.

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