2312 is a hard science fiction novel by American writer Kim Stanley Robinson, published in 2012. It is set in the year 2312 when society has spread out across the Solar System. The novel won the 2013 Nebula Award for Best Novel.^[1]

The novel is set in the year 2312, in the great city of Terminator on Mercury, which is built on gigantic tracks in order to constantly stay in the planet's habitable zone near the terminator. Swan Er Hong, an artist and former asteroid terrarium designer, is grieving over the sudden death of her step-grandmother, Alex, who was very influential among the inhabitants of Terminator. After the funeral procession, a conference is held among the family and the close friends of Alex, some of whom Swan has never heard of. This includes Fitz Wahram, a native of the moon Titan, whom Swan dislikes. Following the conference, Swan decides to head out to Io to visit another friend of Alex's, called Wang, who has designed one of the largest qubes, or quantum computers. While Swan is visiting Wang on Io, an apparent attack of some sort fails. An attack on Terminator shortly follows; a meteorite of artificial origin destroys the city's tracks, stopping the city and exposing it to sun, essentially cooking it. As Swan travels, she learns more of the mystery surrounding her grandmother's death and the destruction of her home-city of Terminator. With Wahram and Genette, Swan travels throughout the Solar System and investigates an escalating series of conspiracies.

Inspector Genette eventually discovers how the artificial meteorite that destroyed Terminator was created: someone launched a large number of smaller objects on trajectories that would eventually cause them to coalesce above Mercury, but low enough that the planet's defense system could not destroy the now large object in time. The complexity of the attack leads her to determine that quantum computers must have been used.

Meanwhile, Swan and Wahram become involved in restoring and re-wilding the climate-change-ravaged Earth by returning thousands of species from space-based temporary environments to their home environments on the Earth.

• Swan Er Hong. An artist and former asteroid terrarium designer
• Fitz Wahram. Diplomat from the moon Titan
• Jean Genette. A "small" who was a close friend to Alex
• Alex. Influential and deceased scientist and diplomat. Swan's step-grandmother
• Mqaret. A scientist and Alex's partner
• Kiran. A young Earth boy who saves Swan from some trouble in his slum-like hometown. In thanks, Swan gives him a job off-planet.

Terminator, a city that slowly drives around Mercury to stay out of direct line from the Sun, first appeared in Robinson's earlier novel The Memory of Whiteness,^[2] as well as appearing during a brief mention in his Mars Trilogy. Terminator is also briefly mentioned in Robinson's 2015 novel Aurora.

Critical reception for 2312 has been mixed to positive,^[3][4] with Strange Horizons saying that "readers must make up their own minds".^[5] Slate Magazine and the Guardian both reviewed 2312, with Slate praising the book as "brilliant" while the Guardian criticized the book's ending as "contrived".^[6][7] Writing for the Los Angeles Times, Jeff VanderMeer called the book a "treasured gift to fans of passionate storytelling", writing that the book's "audacity" was an asset.^[8]

The book won the 2013 Nebula Award for Best Novel,^[1] was nominated for the 2013 Hugo Award for Best Novel,^[9] was shortlisted for the 2012 BSFA Award for Best Novel^[10] and the 2013 Arthur C. Clarke Award,^[11] was honor listed for the 2012 James Tiptree, Jr. Award,.^[12] It was nominated for the 2012 Goodreads Choice Award for science fiction.^[13]

• Space colonization § Mercury