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Lunar mass driver

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1. What we know so far
2. On 2 February 2026, in the update announcing SpaceX's acquisition of xAI, Musk wrote that an electromagnetic mass driver and lunar manufacturing could put 500 to 1,000 terawatts a year of AI satellites into deep space, according to Universe Today.
3. In February 2026, at an xAI all-hands meeting whose video the company posted on X, Musk said the company should build a factory on the Moon to make AI satellites and a large catapult to launch them, according to Engadget and Space.com.
4. The Register reported that Musk told the meeting We're actually going to have a mass driver on the Moon while acknowledging that such a thing was for now in the realm of science fiction.
5. As of 16 February 2026, The Space Review reported that Musk had given no schedule for his lunar plans; no source records a design, contract or hardware for the launcher.
6. On 20 February 2026, Fast Company reported independent researcher Keith Sadlocha's estimate that such a system would need 8.7 to 20 megawatts of continuous power and could take 5 to 15 years to deploy after serious investment.
7. The only mass driver hardware on record is Mass Driver 1, a small prototype that Gerard K. O'Neill and Henry Kolm built at MIT in 1976 and 1977.
8. What it is: A proposed electromagnetic launcher for sending material from the Moon into space
9. Musk proposal: Launching AI-related satellites from a lunar factory
10. First public description: SpaceX's 2 February 2026 update on acquiring xAI, then an xAI all-hands meeting
11. Schedule: No schedule announced for Musk's proposal
12. Historic prototype: Mass Driver 1
13. Expert assessment: Independent researcher Keith Sadlocha rated the technology NASA Technology Readiness Level 5 (per Fast Company)
14. What Musk and SpaceX have said
15. At an xAI all-hands meeting in February 2026, Elon Musk said that a lunar mass driver would launch satellites from a factory and described the device as a maglev train that sends payloads into the solar system. He also said that the technology remained within the realm of science fiction.
16. Musk had first written about the idea in SpaceX's 2 February 2026 update announcing its acquisition of xAI, saying an electromagnetic mass driver and lunar manufacturing could put 500 to 1,000 terawatts a year of AI satellites into deep space. Space.com dates the all-hands meeting 11 February 2026, the day xAI posted its video; Engadget reported the meeting that morning from audio heard by The New York Times.
17. According to The Space Review (Jeff Foust), the lunar mass driver is a proposal rather than an operating project. The Space Review reported that Musk gave no schedule for these lunar ambitions.
18. On 8 February 2026, Musk said on X that SpaceX could complete a self-growing lunar city in less than 10 years. That statement concerned the wider city concept and did not provide a construction or launch schedule for the mass driver.
19. How a mass driver works
20. A mass driver accelerates a payload with sequential magnetic fields rather than chemical propulsion. In the coilgun form described for the lunar proposal, energized coils push a carrier without touching it as it moves along the track.
21. Space.com described mass drivers as railgun-like systems, but other technical descriptions distinguish mass drivers as coilguns and favor a maglev or coilgun design that avoids the contact of a railgun. The terms describe related electromagnetic approaches but are not technically interchangeable.
22. Casey Handmer calculated in May 2026 that a system modeled at 10 million metric tons of raw rock per year would require about 450 megawatts of kinetic power at a stated 90 percent driver efficiency. He also estimated that launching material at 1.6 kilometers per second would require roughly the velocity change needed to reach low lunar orbit, with later transfers requiring solar-powered tugs.
23. History of the idea
24. Gerard K. O'Neill worked on mass drivers during the 1970s and proposed using them to move material from the Moon into space. According to Wikipedia contributors, with Henry Kolm and students at MIT, he built Mass Driver 1 in 1976 and 1977. The model used about 20 drive coils and carried a small bucket, reaching an acceleration near 30 times Earth's gravity on a budget of about $2,000.
25. According to Space.com (Leonard David), O'Neill, Kolm, and student researchers proposed a lunar driver several kilometers long that could transport 600,000 metric tons per year toward an Earth-Moon Lagrange point. Space Studies Institute-backed prototypes also demonstrated that a mass driver 160 meters long could accelerate material off a lunar surface.
26. An illustration shown during the February 2026 xAI meeting resembled lunar mass driver concepts that O'Neill had proposed about 50 years earlier. The Space Review (Jeff Foust) records that Musk's 2026 proposal therefore revisited an older concept for lunar launch rather than introducing the underlying launcher type.
27. Feasibility
28. According to Fast Company, in February 2026, independent researcher Keith Sadlocha estimated that a driver for Musk's purposes would require 8.7 to 20 megawatts of continuous power, 400,000 to 634,000 square feet of solar arrays, and about 362 metric tons of hardware. Fast Company records that he put the track's length at 1,620 to 5,350 feet, with payloads pushed at 30 to 400 times Earth's gravity.
29. Sadlocha rated lunar mass driver technology at NASA Technology Readiness Level 5 and said deployment could take 5 to 15 years after serious investment, potentially extending into the 2040s. Lluc Palerm of Analysys Mason told PC Magazine that the lunar server plan posed a challenge comparable to a Mars mission.
30. In May 2026, Casey Handmer wrote on his blog that pulsed-power infrastructure could dominate the mass and cost of a system with a peak output of 16 gigawatts. He also said a catcher handling about 56,000 launches per day would require demanding vehicle coordination and that braking empty sleds could imply a reactor of 700 to 800 megawatts.
31. Robert Peterkin of General Atomics Electromagnetic Systems said in February 2026 that electromagnetic launch could use abundant lunar solar energy instead of imported chemical rocket fuel. His 2023 Air Force Office of Scientific Research report said Starship delivery of 100 metric tons to the lunar surface could enable a lunar electromagnetic launch system.
32. What exists today
33. Engadget noted in February 2026 that no one had landed on the Moon in more than 50 years and that no lunar colony or factory had ever been built, steps that would come before any lunar launcher. The Space Review reported that Musk gave no schedule for his lunar plans.
34. The documented ground hardware is Mass Driver 1, a student-built prototype constructed at MIT in 1976 and 1977. A later account describes Mass Driver Two with a nominal design acceleration of 5,000 meters per second squared and a final velocity of 112 meters per second, but it did not become a lunar installation.
35. Timeline
36. 1974: Gerard K. O'Neill proposes lunar mass drivers, according to Space.com.
37. 1976: Construction of Mass Driver 1 began at MIT under Gerard K. O'Neill and Henry Kolm.
38. 1977: Mass Driver 1 demonstrated acceleration near 30 g.
39. 1982: An IEEE paper described Mass Driver Two's nominal acceleration and final velocity.
40. 2023: Robert Peterkin filed an Air Force Office of Scientific Research report on lunar electromagnetic launch.
41. 2026-02-02: SpaceX's update announcing its acquisition of xAI names an electromagnetic mass driver and lunar manufacturing.
42. 2026-02-08: Musk said on X that SpaceX could complete a self-growing lunar city in less than 10 years.
43. 2026-02-11: Space.com dates the xAI all-hands meeting at which Musk described a lunar factory and mass driver to this day.
44. 2026-02-20: Keith Sadlocha presented estimates for the power, hardware, and deployment time of a lunar mass driver.
45. 2026-05-08: Casey Handmer publishes calculations and engineering concerns for a lunar mass driver on his blog.

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