Abstract: A space structure which is formed in space. The structure is comprised of an expandable, flexible, generally non-elastic, impervious mold which is arranged in a collapsed state in a container which separates in space to expose the mold to the space environment. The mold is formed to a predetermined configuration by the injection of chemically hardenable filler materials. The vacuum properties of space permit very low injection perssues for the injection process, and the non-gravitational properties of space permit the mold to remain substantially sag-free during hardening of the filler materials.