Britannica
Sources used in this answer
How would a Type II civilization use energy from its host star?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
extraterrestrial intelligence
An artist's conception depicts Kepler-186f, the first Earth-sized extrasolar planet found in its star's habitable zone.
A Type II civilization, as defined by the Kardashev scale, is capable of harnessing the entire energy output of its host star, amounting to approximately watts.1
To achieve this level of energy mastery, such a civilization would theoretically utilize a structure known as a Dyson sphere. This hypothetical megastructure would be designed to completely envelop the star, allowing the civilization to capture and collect all of the stellar energy emitted. By surrounding the star, the civilization could intercept radiation that would otherwise escape into space, effectively converting the star's total power output into usable energy for its own technological and societal needs.12