Lagrange point colonization

[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.

[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.

A diagram showing the five Lagrange points in a two-body system, with one body far more massive than the other (e.g. Earth and Moon). In this system L 3 – L 5 will appear to share the secondary's orbit, although they are situated slightly outside it.