Lagrange point colonization

Lagrange point colonization is a proposed form of space colonization^[1] of the five equilibrium points in the orbit of a planet or its primary moon, called Lagrange points.

The Lagrange points L₄ and L₅ are stable if the mass of the larger body is at least 25 times the mass of the secondary body.^[2][3] Thus, the points L₄ and L₅ in the Earth–Moon system have been proposed as possible sites for space colonies.^[4][5] The L5 Society was founded to promote settlement by building space stations at these points.

Gerard K. O'Neill suggested in 1974 that the Earth–Moon L₅ point, in particular, could fit several thousands of floating colonies, and would allow easy travel to and from the colonies due to the shallow effective potential at this point. A contemporary NASA team estimated that a 500,000-tonne colony would cost US$5.1 billion (equivalent to US$32 billion in 2023) to build.^[4]

O'Neill proposed manufacturing large cylinders or spheres as colony habitats, while others proposed an enclosed torus shape or a huge ring without a "roof". Another approach is to move an asteroid to a Lagrange point with a colony in its hollow interior.

• Interplanetary Transport Network
• Lissajous orbit

• Dictionary Definition
• European Space Agency
• Free Mars
• Orbital Vector Archived September 14, 2017, at the Wayback Machine
• NASA - The Moon and the Magnetotail

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