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 the Moon and beyond. It envisions large human occupied habitats in the Earth-Moon system, especially near stable Lagrangian points. Three designs are proposed: Island one, Island two, and Island 3. These would be constructed using raw materials from the lunar surface launched into space using a mass driver and from near-Earth asteroids. The habitats were to spin for simulated gravity and be illuminated and powered by the Sun. Solar power satellites were proposed as a possible industry to support the habitats.