City on the Moon: Why SpaceX is shifting focus from Mars to Earth’s satellite

Elon Musk has always placed Mars at the center of his ambitions. The SpaceX founder has repeatedly emphasized that the company, established in 2002, was created specifically to colonize the Red Planet. SpaceX’s website identifies Mars as a priority destination for human expansion and exploration. At the same time, Musk has often dismissed the Moon as a distraction, stating as recently as 13 months ago that SpaceX would go directly to Mars.

However, over the past weekend, Musk surprised many by announcing a temporary shift in emphasis toward the Moon. The company is now focusing on building a self-sustaining city on Earth’s satellite — at least for the coming years.

Announcing the Shift: From Mars to the Moon

On Sunday, February 8, Musk wrote on his social network X (formerly Twitter) that SpaceX had already redirected its efforts toward constructing a self-sustaining lunar city because the goal could potentially be achieved in less than 10 years, whereas Mars would require more than 20. He added that the company’s mission remains unchanged: to expand consciousness and life as humanity knows it toward the stars.

Musk explained that practical considerations drove the decision. Missions to Mars are only possible roughly every 26 months when the planets align, with each journey taking about six months. By contrast, flights to the Moon can occur approximately every 10 days and take only two days, enabling much faster iterative development.

Earlier Signals of Changing Priorities

Hints of this shift appeared a week earlier in a detailed update about SpaceX’s plans to deploy a constellation of up to one million satellites for orbital data centers. A key element of that strategy is Starship, the fully reusable rocket system being developed for the colonization of other worlds.

In that February 2 update, Musk highlighted Starship’s lunar potential, noting that advances such as in-orbit refueling would allow the spacecraft to deliver massive amounts of cargo to the Moon. He suggested that a permanent presence could be established there for scientific and industrial purposes, with lunar factories using local resources to manufacture satellites and launch them deeper into space. He also proposed that combining electromagnetic mass drivers with lunar production could enable the deployment of 500–1,000 terawatt-hours per year of AI satellites in deep space, significantly advancing humanity along the Kardashev scale and allowing the use of a meaningful share of the Sun’s energy.

(The Kardashev scale, proposed by a Soviet scientist in 1964, classifies civilizations by their energy consumption: Type I harnesses the energy of an entire planet, Type II that of a star, and Type III that of a galaxy. Humanity has not yet reached Type I.)

A “Bonus Element” or the Main Motivation?

On Monday, February 9, Musk clarified that orbital data centers represent only a secondary benefit of the new strategy. He indicated that the primary driver behind the shift is concern about a catastrophic event. Musk explained that he worries a natural or human-made disaster could interrupt supply lines from Earth and doom a colony. In his view, a self-sustaining lunar city could be achieved in under a decade, whereas Mars would take more than 20 years due to the long iteration cycle — making the lunar effort the more urgent priority.

SpaceX is not abandoning Mars entirely. Musk recently indicated that the Red Planet remains part of the roadmap but will lag behind, with development expected to begin in about five to six years and proceed in parallel with lunar efforts. He has also mentioned the possibility of a crewed Mars flight in 2031.

Lunar Plans: From Artemis to Reality

While a focus on colonizing the Moon is new, SpaceX has already been working on lunar missions for five years. In April 2021, NASA selected Starship as the first crewed lunar lander for the Artemis program, which aims to establish a sustained human presence on and around the Moon by 2030.

If everything proceeds as planned, Starship will deliver astronauts to the lunar surface as part of Artemis III, currently scheduled for 2028. That timeline depends on the success of Artemis II — a crewed lunar flyby with four astronauts that could take place as early as next month.

Starship still needs to demonstrate readiness. So far, the rocket has completed 11 suborbital test flights but has yet to perform an orbital one. Key milestones include proving in-orbit refueling capability — each lunar mission is expected to require roughly 10–12 tanker launches — along with other technical validations.

Last fall, former acting NASA administrator Sean Duffy expressed concern about Starship’s development pace and suggested opening the contract to competition from other companies such as Jeff Bezos’s Blue Origin. NASA is now led by billionaire Jared Isaacman, who has flown to orbit twice with SpaceX, but competitive pressure remains. Blue Origin recently paused suborbital tourism for two years to concentrate on lunar ambitions.

In Brief

SpaceX has temporarily redirected its strategy toward building a self-sustaining city on the Moon — a project Musk believes could be realized within 10 years, compared with more than 20 for Mars. The reasons include faster iteration cycles, concerns about potential catastrophes on Earth, and the added benefit of lunar factories producing AI satellites. Mars remains part of the long-term plan, with development expected to begin in five to six years and a possible crewed mission in 2031. Starship is the central technology but still faces major testing milestones, including orbital flight and in-space refueling. The effort complements NASA’s Artemis program, where Starship is slated to serve as the lunar lander for the 2028 mission.