A Dyson Sphere is a hypothetical megastructure that completely encompasses a star and captures a large percentage of its power output. The first appearance of a Dyson Sphere is in the 1937 Science Fiction novel Star Maker by Olaf Stapledon. This book inspired physicist and mathematician Freeman Dyson to formalize the concept in a 1960 paper "Search for Artificial Stellar Source of Infra-Red Radiation", published in the journal Science. There is no known real-world example of a Dyson Sphere - the sheer quantity of resources and technological advancements required to achieve one can only be dreamed of by the human race, for now.
In DSP, the player's goal is to construct a Dyson Sphere, though there are indications in pre-release footage that it may be possible to stop at a partial sphere, as well as construct more than one layer of sphere. It is also expected that players will be able to construct Dyson Spheres around multiple different stars in the same save.