The Dark Forest Rule: One Solution to the Fermi Paradox

The "dark forest rule" proposed by Cixin Liu, a Chinese science fiction writer, offers a new explanation for the Fermi paradox and is proximate to the "state of nature" detailed by Hobbes. In this paper, the "dark forest rule" is introduced based on the "state of nature". Furthermore, the significance of scientific and technological levels in interstellar communication is discussed. Finally, a revised dark forest rule is put forward: the use of concealment to avoid unknown risks.