The Lunar Gateway was supposed to be humanity's first permanent outpost beyond Earth orbit, a modular station in a Near-Rectilinear Halo Orbit that would anchor Artemis missions, host deep-space research, and serve as a proving ground for Mars systems. That vision drove years of hardware work across the United States, Europe, Japan, and Canada. Then the plan shifted. In late March 2026, NASA said Gateway was being paused in its current form while the agency redirected focus toward lunar surface infrastructure. That change does not erase the progress already made on PPE and HALO, but it does turn this from a simple station-construction story into a live question about which pieces still fly, which get repurposed, and how Artemis works without an orbital hub on the critical path. April 2026 Update Gateway hardware is still real, and far along. What changed is the program's role. NASA's March pivot moved the station off the near-term critical path for Artemis, which means Gateway is now best understood as a partially built architecture looking for its final mission set. NASA infographic showing Gateway's launch trajectory and orbital insertion path. Credit: NASA/Gayle Dibiasio Gateway Architecture: Building a Deep Space Station Unlike the ISS, which orbits just 400 kilometers above Earth, the Gateway will operate in a gravitationally unique orbit around the Moon,sometimes as close as 1,500 km from the lunar north pole and as far as 70,000 km on the far side. This Near-Rectilinear Halo Orbit requires minimal fuel to maintain and provides access to both the lunar south pole and deep space destinations. The Near-Rectilinear Halo Orbit (NRHO) provides a stable, fuel-efficient platform for lunar operations. Credit: NASA Core Modules PPE Power and Propulsion Element , provides 60 kW solar electric propulsion and station power. Built by Lanteris Space Systems (formerly Maxar). HALO Habitation and Logistics Outpost , primary crew living quarters with docking ports. Built by Northrop Grumman with Thales Alenia Space. I-Hab International Habitat , ESA-provided module adding crew quarters, life support, and research capability. Arrives with Artemis IV. ESPRIT European System Providing Refueling, Infrastructure and Telecommunications , propellant storage and comms relay. Canadarm3 CSA-provided robotic arm system with AI-enabled autonomous operations for external maintenance. Airlock Enables extravehicular activities (EVAs) for external maintenance and science operations. HALO Module: From Turin to Arizona In a major milestone for the program, the HALO module's primary structure arrived in the United States in early 2025 after fabrication by Thales Alenia Space in Turin, Italy. The module was transported to Northrop Grumman's facility in Gilbert, Arizona, where it is undergoing final outfitting before integration with the Power and Propulsion Element. Gateway's HALO module arrives at Northrop Grumman's Gilbert, Arizona facility for final outfitting, April 2025. Credit: NASA/Josh Valcarcel June 2026 update NASA's Own Gateway Page Now Signals the Program Is in Rewrite Mode The newest useful signal is not a new module test. It is the note now sitting on NASA's Gateway page. NASA says it is updating its website to align with Artemis program changes announced in February and national space policy initiatives announced in March. That matters because the official Gateway page still hosts the station material, but the agency is openly telling readers that the architecture around it is being revised. SpaceNews reported the harder policy version of the same shift: NASA is halting Gateway work in its current form and redirecting the Artemis architecture toward a lunar base. The planned surface campaign is now framed in three phases, with Phase 1 from 2026 to 2028 focused on reliable lunar access, technology work, and site ground truth near the south pole. Phase 2 from 2029 to 2031 would build out communications, navigation, power, larger cargo landers, and support for two crewed missions a year. Phase 3, beginning in 2032, would push toward longer surface stays and routine logistics. The numbers also sharpen the triage problem. NASA officials described roughly $10 billion for Phase 1 and another $10 billion for Phase 2, with Phase 3 likely costing at least $10 billion more. Gateway, meanwhile, still has hardware and legal gravity. A 2025 reconciliation law provided $2.6 billion for an orbital outpost around the Moon, so NASA cannot simply treat PPE, HALO, and partner contributions as loose parts without congressional buy-in. 2026-2028 Phase 1 now centers on reliable lunar access, CLPS cadence, enabling technologies, and south pole site data. $20B NASA described the first two lunar-base phases as roughly $10 billion each before Phase 3 begins. $2.6B Gateway still has congressional funding language tied to an outpost in orbit around the Moon. The real question is no longer whether the hardware works PPE and HALO remain the key U.S. hardware pieces, but the decision point has moved above engineering. If Artemis is rebuilt around surface permanence, Gateway hardware has to prove it can serve that surface plan. PPE could become power and propulsion infrastructure for another mission. HALO could become a pressure vessel in a different architecture. Partner modules could be reassigned, delayed, or folded into later surface logistics. That is why Gateway has become a triage problem rather than a cancellation story. NASA has sunk too much work into the modules to ignore them, and Congress has written too much orbit-specific funding into law to let the agency quietly walk away. The next real milestone is not a clean launch date. It is a decision on which pieces still match the Moon-base plan, which pieces need redesign, and which international commitments survive the rewrite. Sources: NASA Gateway program page, NASA March Moon to Mars policy materials, and SpaceNews reporting on NASA's Gateway pause and lunar-base pivot. Key Timeline Update NASA is currently targeting a 2027 launch for the combined PPE and HALO elements aboard a SpaceX Falcon Heavy rocket. After launch, the PPE's solar electric propulsion system will guide both modules through a roughly year-long journey to lunar orbit, arriving in NRHO ahead of the Artemis IV crew assembly mission. Crew Operations in Deep Space Gateway operations differ fundamentally from ISS operations. Crews will visit the station for 30 to 90 day missions rather than maintaining continuous habitation. This "expedition-class" approach reduces life support demands while maximizing scientific return during each crew rotation. Crew Mission Profile Parameter Details Crew Size 4 astronauts per rotation Mission Duration 30–90 days Crew Vehicle NASA Orion spacecraft via SLS Transit Time (Earth→Gateway) ~4–5 days Emergency Return Orion available for ~72-hour Earth return Habitable Volume ~125 m³ (fully assembled) Health and Safety Challenges • Radiation Exposure: Beyond the Van Allen belts, crews face significantly higher radiation than on the ISS. Gateway's HALO module incorporates enhanced shielding, and mission durations are planned accordingly. • Microgravity Effects: Exercise countermeasures and monitoring protocols adapted from ISS experience will mitigate bone density loss and cardiovascular deconditioning. • Psychological Factors: Distance from Earth (approximately 385,000 km) and communication delays introduce psychological considerations unique to deep space missions. • Autonomous Operations: When uncrewed, Gateway must operate autonomously for months, maintaining systems and preparing for the next crew arrival. Scientific Research and Technology Demonstration Josh Litofsky leads a Gateway lunar dust adhesion testing campaign at NASA's Johnson Space Center. Credit: NASA/Bill Stafford Gateway enables a research portfolio impossible to conduct on the ISS or the lunar surface alone. Its unique orbital position offers: 🔬 Deep Space Science Cosmic ra