NASA has begun stacking hardware for its Artemis III mission, with the arrival of a solid rocket booster segment at Kennedy Space Center marking a key milestone in preparations for the crewed launch targeted for mid-to-late 2027.
What Happened
The bottom segment of the left-hand solid rocket booster (SRB) was transported to KSC's Vehicle Assembly Building this week, according to a NASA social media post. This is one of two SRBs that will be affixed to either side of NASA's Space Launch System (SLS) rocket. The boosters provide 7.2 million pounds of force — more than 75% of the rocket's power at liftoff. Each SRB stands about 177 feet tall and carries a combined weight of 3.2 million pounds, packed with polybutadiene acrylonitrile, ammonium perchlorate, and aluminum powder. The Artemis III SLS core stage arrived in the VAB in May without its engine section attached. NASA Administrator Jared Isaacman has said the agency aims to complete a wet dress rehearsal before the end of the year.
Why It Matters
Artemis III represents NASA's second crewed mission under its next-generation lunar program, building toward the goal of returning astronauts to the moon. While this mission won't land on the lunar surface — that milestone is planned for Artemis IV in late 2028 — it will test critical rendezvous and docking capabilities with two privately contracted lunar landers: Blue Origin's Blue Moon and SpaceX's Starship V3. The four-person crew will spend about two weeks testing these procedures, including EVA suit components inside the Blue Moon cabin. For NASA, maintaining this stacking timeline is essential to preserving schedule margin for a mid-to-late 2027 launch window.
The Bottom Line
NASA has started hardware assembly for Artemis III with booster integration at Kennedy Space Center. The mission will validate docking procedures with both SpaceX and Blue Origin landers as the agency progresses toward its first crewed lunar landing, currently slated for Artemis IV in late 2028.