Reference: [[Three-Body Problem – Liu Cixin]] | [[Dark Forest – Liu Cixin]] | [[Death's End – Liu Cixin]] *(Spoilers ahead)* - -- The Dark forest theory, was proposed by [Luo Ji](https://three-body-problem.fandom.com/wiki/Luo_Ji "Luo Ji") under the hints of [Ye Wenjie](https://three-body-problem.fandom.com/wiki/Ye_Wenjie "Ye Wenjie") during a brief conversation. Dark forest theory states that the universe is in a perpetual state of darkness and paranoia. Within the dark forest are hunters and angels, if you were to light a fire or signal you position, then another hunter might preemptively fire at you, as it is too risky to take a chance and see if you are an angel, because by the time you communicate with someone, they could preemptively fire upon you. In the same way if you were to find someone else's fire, you would be better off firing at them, as hailing them to see if they are an angel might cause them to fire upon you as well. [Luo Ji](https://three-body-problem.fandom.com/wiki/Luo_Ji "Luo Ji") who as part of his [Wallfacer](https://three-body-problem.fandom.com/wiki/Wallfacer "Wallfacer") project sends a signal using a star 50 light years away, broadcasting the location of said star in every direction. His theory is proven true when the stars destruction was confirmed after humanity's defeat at the [Doomsday Battle](https://three-body-problem.fandom.com/wiki/Doomsday_Battle "Doomsday Battle"). Luo Ji and humanity use this information and technology as humanity and the Trisolarans enter the deterrence era. Using the threat of signals and mutually assured self-destruction to stave off war. Thus beginning the deterrence era The Dark Forests concept is known throughout the entire universe, and across multiple dimensions. Within 4D Guan Yifan encounters a the sentient tombship known as the [Ring](https://three-body-problem.fandom.com/wiki/The_Ring "The Ring") who explains how higher dimensional civilisations have moved from 4D space to 3D space, implied due to destruction of 4D space due to higher dimensional dark forest strikes viz https://three-body-problem.fandom.com/wiki/Dark_Forest_theory https://en.wikipedia.org/wiki/Fermi_paradox - -- Defining [[System (Process)]] Axioms; [[Practical execution of Axioms]] [[System Axioms v1]] [[System Axioms (Process)]] - --