Everything Everywhere Daily · Monday, June 29, 2026
Concepts for future space habitats range from O'Neill cylinders, which are gigantic rotating cylinders offering vast interior space, to Dyson spheres, megastructures designed to capture a star's energy. While O'Neill cylinders are still theoretical, Dyson's original idea was a swarm of orbiting collectors rather than a solid shell.
“Something that would radically expand the amount of living space that people could have is an O'Neill cylinder. An O'Neill cylinder is a gigantic rotating cylinder with its entire interior available for use.”
“A Dyson sphere is a proposed megastructure that would completely surround a star and capture all or some of its energy output. The usual image is a solid shell surrounding a star, but physicist Freeman Dyson did not originally propose such a rigid sphere.”