Lunar Return Pushed to 22 Launches as NASA Reveals Critical Starship Estimate

NASA’s Artemis program now faces a stark logistical hurdle: the agency’s latest internal estimate suggests that 22 launches of SpaceX’s Starship rocket are required to fully fuel a lunar lander for a round trip to the Moon. This figure, revealed during a recent safety review, represents a significant jump from earlier projections and underscores the immense complexity of resupplying vehicles in low-Earth orbit. The number marks a pivotal moment in the decade-long effort to return humans to the lunar surface, as it directly dictates the pace and feasibility of the mission schedule.

The estimate emerged on Thursday during the quarterly meeting of the NASA Aerospace Safety Advisory Panel. Panel member Charlie Precourt, a former NASA astronaut, discussed the specific risks associated with the Artemis architecture. He highlighted that the number of launches needed to create a propellant depot in orbit is a critical variable in the overall mission risk assessment. The panel’s focus on this metric signals that NASA is moving away from vague approximations toward concrete planning figures, even if those figures are not what stakeholders had hoped for.

This latest figure of 22 stands in contrast to previous, more optimistic estimates. For years, NASA officials have guarded the exact number of required launches with intense secrecy, often responding to inquiries with statements that the agency did not have a definitive answer. In 2023, Lisa Watson-Morgan, then-director of NASA’s Human Landing System, told Ars Technica that while the agency had a general idea, she was reluctant to specify the exact count. She later indicated the number was in the “high single digits to the low double digits,” which implied approximately a dozen launches. Other officials have cited figures in the “high teens,” but the new 22-launch estimate pushes the requirement into the low double digits with a higher threshold.

The discrepancy between the new estimate and past projections raises questions about the development trajectory of the Starship vehicle. The original hope was that SpaceX would dramatically increase the lift capacity of the rocket, thereby reducing the number of tanker flights needed to top off the depot. The 22-launch scenario assumes a specific configuration where a “depot” Starship is launched first, followed by multiple “tanker” Starships to deliver liquid oxygen and methane propellant. If the vehicle’s payload capacity does not improve rapidly, the number of orbital rendezvous and refueling operations will remain high, increasing the operational burden on both NASA and SpaceX.

Concerns are growing among some NASA officials that the necessary improvements in Starship’s performance may not arrive soon enough. The agency aims to use the vehicle to play a meaningful role in returning humans to the Moon within the current decade. However, the logistics of coordinating 22 separate launches, along with the subsequent in-orbit operations to transfer propellant, present a tight timeline. If the lift capacity does not increase as anticipated, the window for a crewed lunar landing this decade may narrow considerably, forcing a potential shift in mission priorities or dates.

The secrecy surrounding this metric has long been a point of contention for observers and stakeholders. NASA’s cautious approach to releasing the exact number of required launches has been compared to guarding nuclear codes, reflecting the sensitivity of the Artemis program’s technical details. As the program moves from development to execution, the transparency of such key performance indicators becomes increasingly important for public understanding and stakeholder confidence. The release of the 22-launch estimate provides a clearer, albeit challenging, picture of the path forward.

Looking ahead, the focus will shift to how NASA and SpaceX adapt their planning to accommodate this new reality. The number of launches will directly influence the frequency of orbital operations and the scheduling of the crewed Artemis missions. Stakeholders will be watching closely for any updates on Starship’s performance metrics, as even modest improvements in payload capacity could lower the launch count and alleviate some of the pressure on the timeline. For now, the 22-launch estimate serves as a benchmark for the next phase of the lunar return effort.