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1992 science fiction novel by Vernor Vinge

A Fire Upon the Deep is a 1992 science fiction novel by American writer Vernor Vinge. It is a space opera involving superhuman intelligences, aliens, variable physics, space battles, love, betrayal, genocide, and a communication medium resembling Usenet. A Fire Upon the Deep won the Hugo Award in 1993, sharing it with Doomsday Book by Connie Willis. Besides the normal print book editions, the novel was also included on a CD ROM sold by ClariNet Communications along with the other nominees for the 1993 Hugo awards. The CD ROM edition included numerous annotations by Vinge on his thoughts and intentions about different parts of the book, and was later released as a standalone e book.

An expedition from Straumli Realm, an ambitious young human civilization in the high Beyond, investigates a five billion year old data archive in the low Transcend that offers the possibility of unimaginable riches. The expedition's facility, High Lab, is gradually compromised by a dormant superintelligence within the archive later known as the Blight. However, shortly before the Blight's final "flowering", two self aware entities created similarly to the Blight plot to aid the humans before the Blight can escape. Recognizing the danger of what they have awakened, the researchers at High Lab attempt to flee in two ships, one carrying all the adults and the second carrying all the children in "coldsleep boxes". Suspicious, the Blight discovers that the first ship contains a data storage device in its cargo manifest; assuming it contains information that could harm it, the Blight destroys the ship. The second ship escapes. The Blight assumes that it is no threat, but later realizes that it is actually carrying away a "countermeasure" against it. The ship lands on a distant planet with a medieval level civilization of dog like creatures, dubbed "Tines", who live in packs as group minds. Upon landing, however, the two surviving adults are ambushed and killed by Tine fanatics known as Flenserists, in whose realm they have landed. The Flenserists capture a young boy named Jefri Olsndot and his wounded sister, Johanna. While Jefri is taken deeper into Flenserist territory, Johanna is rescued by a Tine pilgrim who witnessed the ambush and delivers her to a neighboring kingdom ruled by a Tine named Woodcarver. The Flenserists tell Jefri that Johanna has been killed by Woodcarver and exploit him in order to develop advanced technology (such as cannon and radio communication), while Johanna and the knowledge stored in her "dataset" device help Woodcarver rapidly develop in turn. A distress signal from the sleeper ship eventually reaches "Relay", a major node in the galactic communications network. A benign transcendent entity named "the Old One" contacts Relay, seeking information about the Blight and the humans who released it, and reconstitutes a human man named Pham Nuwen from an old wreck to act as its agent, using his doubt of his own memory's veracity to bend him to the Old One's will. Ravna Bergsndot, the only human Relay employee, traces the sleeper ship's signal to the Tines' world and persuades her employer to investigate what the human ship took from High Lab, contracting the merchant vessel Out of Band II, owned by two sentient plant "Skroderiders", Blueshell and Greenstalk, to transport them. Before the mission is launched, the Blight attacks Relay and concurrently kills Old One. As Old One dies, it downloads what information it can into Pham to defeat the Blight, and Pham, Ravna and the Skroderiders barely escape Relay's destruction in the Out of Band II. The Blight expands, taking over races and "rewriting" their people to become its agents, murdering several other Powers, and seizing other archives in the Beyond, looking for what was taken. It finally realizes where the danger truly lies and sends a hastily assembled fleet in pursuit of the Out of Band II. The humans arrive at the Tines' homeworld and ally with Woodcarver to defeat the Flenserists. Pham initiates Countermeasure, which extends the Slow Zone by thousands of light years, enveloping the Blight at the cost of wrecking thousands of uninvolved civilizations and causing trillions of deaths. The humans are stranded on the Tines world, now in the depths of the "Slow Zone". Activating the countermeasure costs Pham his life, but just before Pham dies, he realizes that, although his body is a reconstruction, his memories are real. Vinge expands on Pham's background story in A Deepness in the Sky.

A race of humanoids with colorful butterfly like wings who attempt to use the chaos wrought by the Blight to reestablish their waning hegemony. Despite their attractive, delicate appearance, the Aprahanti are an extremely fearsome and vicious species.

An ancient, malevolent super intelligent entity which strives to constantly expand and can easily manipulate electronics and even organic beings.

An older race which originally inhabited Sjandra Kei before the arrival of humanity.

All humans in the novel (except Pham) are descended from Nyjoran stock. Their ancestors were "Tuvo Norsk" asteroid miners from Old Earth's solar system, which is noted as being on the other side of the galaxy in the Slow Zone. (Nyjora sounds similar to New Norwegian "New Earth".) One of the major human habitations is Sjandra Kei, three systems comprising roughly 28 billion individuals. Their main language is Samnorsk, the Norwegian term for a hypothetical unification of the Bokmål and Nynorsk forms of the language. (Vinge indicates in the book's dedication that several key ideas in it came to him while at a conference in Tromsø, Norway.)

A race of plantlike beings with fronds that are used for expression. The riders have no native capacity for short term memory. Five billion years ago, someone gave the species wheeled mechanical constructs ("skrodes") to move around and to provide short term memory. It is later revealed that their "benefactor" was the Blight, and it is able to corrupt and remotely operate the Riders via their skrodes.

A race of group minds: each person is a "pack" of 4–8 doglike members, which communicate within the pack using very short range ultrasonic waves from drumlike organs called "tympana". Each "soul" can survive and evolve by adding members to replace those who die, potentially for hundreds of years, as Woodcarver does.

A race of grub like insectoids, authoritarian and warlike, who constitute one of the "majority races" of the Vrinimi organization.

Vinge's original title for the novel was "Among the Tines"; its final title was suggested by his editors.

A Fire Upon the Deep shared the 1993 Hugo Award for Best Novel with Doomsday Book. the 1993 John W. Campbell Memorial Award for Best Science Fiction Novel,