NASA Artemis Shake-Up: Artemis III Now a Low-Earth Orbit Mission, Centaur V Replaces Exploration Upper Stage

NASA Administrator Jared Isaacman announced sweeping changes to the Artemis lunar program, canceling the Space Launch System's Exploration Upper Stage (EUS) and replacing it with United Launch Alliance's commercial Centaur V upper stage starting with Artemis IV. The mission profile has also changed: Artemis III will no longer attempt a lunar landing, instead becoming a low-Earth orbit docking mission with SpaceX's Starship and Blue Origin's Blue Moon landers before Artemis IV becomes the first landing attempt. The restructuring is intended to reduce costs, increase launch cadence, and accelerate the timeline amid growing concern about competition from China's lunar program.

Key Takeaways

• Artemis III mission redesigned as an LEO docking mission (no lunar landing); Artemis IV becomes the first Moon landing attempt — announced Feb 27, 2026 by NASA Administrator Jared Isaacman
• EUS cancellation: ULA Centaur V upper stage (used on Vulcan) replaces the Exploration Upper Stage for SLS from Artemis IV onward; Boeing remains prime contractor for the SLS core stage
• SLS Artemis II helium issue resolved; rocket returns to launch pad in late March targeting April 1 launch window (6:24 PM EDT); secondary windows April 3–6

Original source: Ars Technica