New Estimates Raise Questions
During the quarterly meeting of NASA's Aerospace Safety Advisory Panel, panel member Charlie Precourt raised technical concerns regarding the Artemis program, which is dedicated to returning humans to the Moon. Precourt noted that current estimates suggest SpaceX's Starship vehicle requires about 22 orbital launches to provide the lunar lander with the fuel necessary for the journey and return.
This figure is the latest in a series of shifting estimates that NASA has been hesitant to disclose precisely for years. In 2023, Lisa Watson-Morgan, then-manager of NASA's Human Landing System program, indicated that the number ranged from "high single digits to low double digits," effectively meaning about 12 launches, while other officials had previously mentioned numbers closer to twenty.
SpaceX's Reaction
Elon Musk, founder of SpaceX, was quick to respond to these estimates via the X platform, describing the number 22 as "way too high" and asserting that the actual number required would be in the range of only 6 to 8 launches. This significant discrepancy reflects the technical uncertainty surrounding the transfer of cryogenic propellants (methane and liquid oxygen) in space, and the efficiency of this process under orbital conditions.
Why This News Matters
The importance of this controversy lies in its impact on the core operational feasibility of the Artemis program. If the actual requirement exceeds 20 launches, it imposes massive logistical and technical challenges on SpaceX, particularly regarding:
- Launch Rate: Even with SpaceX reaching its stated goal of launching the vehicle twice a week by the end of 2027, refueling a single vehicle would take months, which affects the mission timeline.
- Transfer Efficiency: Technologies for transferring cryogenic propellant in orbit are still under development, and any loss of fuel due to boil-off will directly lead to an increase in the number of required flights.
- Artemis Timeline: NASA aims to achieve a human landing on the Moon by 2028, and any complexity in refueling operations could threaten this target date.
Despite these challenges, Precourt praised the efforts of current NASA leadership in providing the necessary resources to overcome technical obstacles for SpaceX and Blue Origin, which is also developing a lunar lander, although it does not rely on orbital refueling in its initial design.