Imagine a world beyond Earth, where humanity builds its own planet among the stars. The O’Neill Cylinder is one of the most extraordinary visions of humanity’s future in space, proposed by physicist Gerard K. O’Neill in his 1976 book The High Frontier.
This colossal orbital habitat consists of two enormous rotating cylinders, each approximately 5 miles (8 kilometers) in diameter and 20 miles (32 kilometers) long. Spinning in opposite directions, they help cancel gyroscopic effects and improve the settlement’s stability. Inside, rotation generates artificial gravity, allowing people to experience conditions similar to those on Earth.
Imagine standing beneath a vast artificial sky, surrounded by green valleys, flowing rivers, forests, and thriving cities, while the darkness of space stretches beyond enormous windows. Three habitable valleys alternate with three giant windows, creating an environment designed to support an Earth-lik…
