Musk Slashes Lunar Fuel Count

Elon Musk publicly disputed a NASA safety panel's projection for the Artemis IV mission on Thursday. The disagreement centers on the number of Starship launches required to refuel a lunar lander in orbit. Musk believes the true figure is far lower than the one presented by government advisors.

Charlie Precourt, a former astronaut and member of the Aerospace Safety Advisory Panel, raised the issue during the group's quarterly meeting. He identified lander fueling as a primary risk for the 2028 crewed Moon landing. Precourt cited an estimate of approximately 22 flights needed to fill the orbital depot.

Musk reacted to the remark after reporter Eric Berger shared Precourt's comments on X. The SpaceX chief called the panel's number "way too high." He countered that the actual requirement will be between six and eight tanker flights.

The logistical challenge stems from Starship's size. The vehicle consumes nearly all its propellant reaching Earth orbit, necessitating in-space refueling. SpaceX's plan involves launching a storage depot first, followed by a series of tankers. These tankers dock sequentially to transfer remaining fuel. Once the depot is full, the crewed lander departs for the Moon.

The difference in estimates carries operational weight. Each launch adds time, cost, and potential failure points before a crew reaches space. Berger noted that even at a pace of two launches per week, a 22-flight requirement would take roughly three months to complete. A six-to-eight flight scenario would compress that timeline substantially.

The variance in numbers likely reflects differing assumptions about vehicle capability. NASA appears to base its figure on current Starship lift capacity. Musk's lower range assumes a more capable version of the rocket. Propellant also boils off during orbital waits and transfers, adding complexity to the calculation.

This is not Musk's first challenge to high launch counts. In 2021, he dismissed a government estimate of 16 launches as "extremely unlikely," asserting that eight would be the maximum. Precourt acknowledged that Artemis IV involves many firsts. He also praised NASA Administrator Jared Isaacman for working to clear obstacles for both SpaceX and Blue Origin.