Overview of Dyson Spheres: What is a Dyson Sphere? A Dyson Sphere is a hypothetical megastructure that could be built around a star to capture its energy. This concept was first proposed by physicist Freeman Dyson in the 1960s. How Does it Work? A Dyson Sphere would be a massive, spherical structure that completely encloses a star. It would be designed to capture and convert the star's electromagnetic radiation into energy, which could then be used to power civilization. Types of Dyson Spheres T