The Three-Body Problem (Chinese: 三体; pinyin: Sān tǐ; lit. 'three body') is a 2008 novel by the Chinese hard science fiction author Liu Cixin. It is the first novel in the Remembrance of Earth's Past trilogy. The series portrays a fictional past, present, and future wherein Earth encounters an alien civilization from a nearby system of three Sun-like stars orbiting one another, a representative example of the three-body problem in orbital mechanics. The story was originally serialized in Science Fiction World in 2006 before it was published as a standalone book in 2008. In 2006, it received the Galaxy Award for Chinese science fiction. In 2012, it was described as one of China's most successful full-length novels of the past two decades. The English translation by Ken Liu was published by Tor Books in 2014. That translation was the first novel by an Asian writer to win a Hugo Award for Best Novel; it was also nominated for the Nebula Award for Best Novel. The book has been adapted into other media. In 2015, a Chinese film adaptation of the same name was in production, but it was never released. A Chinese TV series, Three-Body, was released in early 2023 to critical success locally. An English-language Netflix series adaptation, 3 Body Problem, was released in March 2024.
Background Liu Cixin was born in Beijing in June 1963. Before beginning his career as an author, he was a senior engineer working at a power plant in Shanxi province. In 1989, he wrote Supernova Era and China 2185, but neither book was published at that time. His first published short story, Whale Song, was published in Science Fiction World in June 1999. The same year, his novel With Her Eyes won the Galaxy Award. In 2000, he wrote The Wandering Earth, which also received the Galaxy Award and was adapted into a film in 2019. When the short story Mountain appeared in January 2006, many readers wrote that they hoped Liu would write a novel. He decided to concentrate on novel-length texts rather than short stories. Outside of Remembrance of Earth's Past, Liu's novels include Supernova Era and Ball Lightning. When not otherwise busy, Liu wrote 3,000–5,000 words a day; each of his books reportedly took about one year to complete.
Plot
During China's Cultural Revolution, astrophysicist Ye Wenjie witnesses her father beaten to death during a struggle session. A political outcast, Ye is initially sentenced to a labor camp but is then recruited to "Red Coast," a secret military initiative attempting to search for and communicate with extraterrestrial life. At Red Coast, Ye discovers a method to amplify radio frequency transmissions using the Sun, with which she secretly broadcasts a message. Eight years later, she receives a reply from the alien planet Trisolaris, which warns her not to make any further communications to avoid the Trisolarans learning the location of Earth and subsequently invading. Disillusioned by humanity's inability to live harmoniously with itself and nature, Ye invites the Trisolarans to Earth to settle its problems. After China's reforms, Ye encounters Mike Evans, heir to the world's largest oil company but also a radical environmentalist who shares Ye's ideals and disappointment in humanity. Ye discloses Trisolaris' existence to Evans, who founds and finances the secret Earth-Trisolaris Organization (ETO) as a militant fifth column for Trisolaris, with Ye as the ETO's leader. Through Trisolaris-ETO communications, Trisolaris is revealed to be a planet orbiting the ternary star system of Alpha Centauri. Because of the three-body problem, the three stars' movements (and Trisolaris' position relative to them) are chaotic and unpredictable. As a result, Trisolaris experiences great climate extremes, alternating between temperate "Stable Eras" during which civilization thrives, and "Chaotic Eras" of climate catastrophes. The worst such catastrophes are civilization-ending. Hundreds of Trisolaran civilizations have risen and fallen, each attempting but failing to develop an accurate calendar that can predict and help prepare for Chaotic Eras. Upon reception of Ye's broadcasts, the current and technologically advanced Trisolaran civilization identifies Earth as a colonization target, which will permit the Trisolaran civilization to escape their inhospitable and ultimately-doomed home planet. It dispatches an invasion force on a 450-year journey to Earth. However, the Trisolaran leadership is concerned that Earth's accelerating technological developments will outmatch the invasion force by the time of its arrival. Therefore, Trisolaris develops "sophons" (minuscule supercomputers embedded in single protons) in order to arrest Earth's technological development by interfering with its scientific experiments. By the late-2000s/early-2010s, the sophon-induced apparent breakdown of science on Earth has prompted the suicides of prominent scientists. This alarms Earth's governments, who form an international task force to investigate, recruiting nanotechnologist Wang Miao and detective Shi Qiang. As part of his investigation, Wang plays the virtual reality video game Three Body, which is a simulation of Trisolaris created by the ETO to identify potential recruits and to garner sympathy for the Trisolaran plight. Wang's successes in Three Body result in his induction into the ETO, where Ye reveals to Wang the full extent of the conspiracy. Wang also witnesses the schism between the "Adventist" faction of the ETO, which views humanity as irredeemable and promotes its complete destruction by Trisolaris, and the "Redemptionist" faction, which aims to save the Trisolaran civilization by developing a solution to the three-body problem and producing an accurate calendar. Tipped-off by Wang, Shi and the People's Liberation Army raid the meeting, arresting Ye. An international military force then seizes the converted oil tanker housing ETO's communications with Trisolaris. From these actions, Earth's governments directly learn of Trisolaris' existence and the approaching invasion force. Wang and his colleagues resolve to fight in Humanity's defense.
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