The High Frontier: Human Colonies in Space is a 1976 book by Gerard K. O'Neill, a road map for what the United States might do in outer space after the Apollo program, the drive to place a human on th
First edition cover
O'Neill cylinders
Interior of an O'Neill cylinder
Interior of an O'Neill cylinder
Bernal sphere
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A Bernal sphere is a type of space settlement intended as a long-term home for permanent residents, first proposed in 1929 by John Desmond Bernal.
The High Frontier: Human Colonies in Space
…large human occupied habitats in the Earth-Moon system, especially near stable Lagrangian points. Three designs are proposed: Island one (a modified Bernal sphere), Island two (another sphere), and Island 3 (two O'Neill cylinders). These would be constructed using raw materials from the lunar surface launched…
Exterior of a Bernal sphere
Interior of a Bernal sphere
The inside of the sphere as viewed from the sunlight "portal"
Agricultural module of a Bernal sphere