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''Aurora'' is a 2015 novel by American science fiction author Kim Stanley Robinson. The novel concerns a generation ship traveling to Tau Ceti in order to begin a human colony, and their return to Earth after the colony fails. The novel is unusual in that the narrating voice is that of the starship computer's artificial intelligence. The novel was well received by critics.〔 ==Plot== A generation ship is launched from Saturn in 2545, consisting of twenty-four self-contained biomes and an average population of two thousand people. One hundred sixty years and approximately seven generations later it is beginning its approach to the Tau Ceti system to begin colonization of a gas giant planet's moon, an Earth analog, which has been named Aurora. Devi, the ship's ''de facto'' chief engineer and leader, is concerned about the decaying infrastructure and biology of the ship: systems are breaking down, each generation has lower intelligence-test scores than the last, and bacteria are mutating and evolving at a faster rate than humans. She tells the ship's AI, referred to simply as 'Ship,' to keep a narrative of the voyage. After having some trouble with understanding the human concept of narrative, Ship eventually elects to follow the life of Devi's daughter Freya as a protagonist. As a teenager, Freya travels around the ship on her ''wanderjahr'', and learns that many of the ship's inhabitants are dissatisfied with their enclosed existence and what they perceive as a dictatorship. Movement is strictly limited for most people, reproduction is tightly controlled, and education in science and mathematics is mandatory. Freya's ''wanderjahr'' comes to an end when she is called home as Devi grows sick from cancer and dies. The ship arrives in the Tau Ceti system and begins to settle Aurora, a moon of Tau Ceti e. It soon becomes apparent that extraterrestrial life is present in the form of primitive prions, which infect and kill most of the landing party. The surviving settlers attempt to return to the ship, and some of those remaining onboard kill them in the airlock to maintain quarantine, leading to a violent political schism throughout the ship. Ship itself, which has been moving towards self-awareness, takes physical control of the situation by lowering oxygen levels and separating warring factions, referring to itself as "the rule of law." Under Ship's moderation, a more peaceful debate takes place between the inhabitants about what to do now that Aurora is known to be inhospitable. Eventually it is decided that some settlers will remain on a different planet in the Tau Ceti system which is likely to be free of hostile life; others decide to return to Earth in the ship. On the voyage back to Earth, the ship's biomes continue to deteriorate as bacteria flourish and crops fail. The humans soon face famine, and opt to experiment with an untested form of cryogenic freezing, which is largely successful. Upon returning to the Solar system, Ship is forced to decelerate by means of gravity assist between various planets, a process which takes twelve years. During this time, with the full communications data of humanity available to it, it learns more about why it was launched in the first place - simply for expansionism - and denounces its builders as "criminally negligent narcissists." Ship manages to safely drop its humans off on a pass of Earth, but fails to successfully make a final gravity slowdown past the Sun, and is destroyed. Freya and the other "starfarers" have trouble adjusting to life on Earth, especially with many Terrans hostile to them for a perceived sense of ingratitude and cowardice. At a space colonization conference, a speaker says humanity will continue to send ships into interstellar space no matter how many fail and die, and Freya assaults him. Eventually she joins a group of terraformers who are attempting to restore the Earth's beaches after their loss during previous centuries' sea level rise. While swimming and surfing, she begins to come to terms with life on Earth. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aurora (novel)」の詳細全文を読む スポンサード リンク
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