Musk Cuts Lunar Fueling Count to Eight

Elon Musk publicly disputed a recent estimate from a NASA safety advisory panel regarding the number of rocket launches required to fuel a lunar lander. Musk stated the actual figure will be between six and eight flights, a sharp reduction from the 22 launches cited by panel members. This disagreement centers on the logistics of the Artemis IV mission, which is currently scheduled to land a crew on the Moon in 2028.

The conflict emerged after the Aerospace Safety Advisory Panel held its quarterly public meeting on Thursday. Panel member Charlie Precourt, a former NASA astronaut, identified the fueling process as a primary risk for the mission. Precourt noted that the last available estimate stood at around 22 flights. He emphasized the need to monitor the numerous required fuelings for the lander, a remark that was shared by Ars Technica reporter Eric Berger on X. Musk responded directly to the post, calling the panel’s number way too high and asserting that the real count would be closer to six to eight.

The discrepancy arises from the physical constraints of Starship, a vehicle so large that it consumes nearly all its propellant reaching Earth orbit. It cannot proceed to the Moon without an orbital refueling stop. SpaceX’s plan involves launching a storage tank, or depot, first. Tanker Starships then fly sequentially, dock with the depot, and transfer their remaining fuel. Once the depot is full, the lunar lander launches, docks, fills its tanks, and departs. Because each tanker represents a complete rocket launch, the total number directly impacts mission timeline and cost.

Berger calculated that even if SpaceX achieves a launch rate of two Starships per week by the end of 2027, filling a depot with 22 tankers would still take approximately three months. The final number depends on how much propellant each tanker can deliver and how much is lost through boil-off in the extreme cold of space. NASA appears to be basing its estimate on the vehicle’s current lifting capacity, while Musk’s lower range assumes the upgraded V3 Starship will perform significantly better.

Musk has previously contested higher launch counts. In 2021, after a government document suggested 16 launches were needed, he described that figure as extremely unlikely, stating that eight tankers would be the maximum requirement. The debate hinges on hardware SpaceX has not yet fully tested in flight. Precourt acknowledged that Artemis IV involves a large number of firsts. He also praised NASA Administrator Jared Isaacman’s team for working to remove obstacles for both SpaceX and Blue Origin, whose Blue Moon lander does not require orbital refueling for its initial mission.