Artemis 3 to fly SLS with spacer upper stage replacing ICPS
NASA will launch Artemis 3 on the Space Launch System with an inert spacer substituting for the ICPS upper stage. The spacer, built at Marshall Space Flight Center, will match ICPS dimensions and interfaces so Orion’s flight hardware and missions can proceed. With ICPS no longer in production, Artemis 4 will carry the ICPS, while Centaur will be used on later SLS launches; Artemis 3 will rely on Orion’s own propulsion to circularize into a ~463-km orbit as NASA defines a three‑launch campaign to test rendezvous with two landers from Blue Origin and SpaceX. Exact crew, suit testing, and dates remain under development, with a rough target in 2027–2028.