Dyson Sphere

A Dyson Sphere is an artificial megastructure of astronomical scale, constructed as a solid shell completely surrounding a star at a radius of approximately 200 million kilometers. The interior surface captures and utilizes virtually all of the star's electromagnetic radiation, providing nearly limitless energy to support an advanced civilization.

The sphere discovered by the Enterprise-D in 2369 had a habitable interior surface area equivalent to millions of Class-M planets, with an artificial gravity field maintaining standard conditions across the inner surface. The structure included massive doorways allowing starship passage and demonstrated engineering capabilities far beyond Federation technology. The energy requirements and material science needed to construct such a megastructure remain theoretical, representing the ultimate achievement in stellar engineering. Construction would require the mass of multiple planets and technologies to maintain structural integrity against tidal forces and thermal expansion across billions of square kilometers.