Xeelee Sequence

The Xeelee Sequence (/ˈziːliː/; ZEE-lee)[1][2] is a series of hard science fiction space opera novels, novellas, and short stories written by British science fiction author Stephen Baxter. The series spans billions of years of fictional history, centering on humanity's future expansion into the universe, its intergalactic war with an enigmatic and supremely powerful Kardashev Type IV alien civilization called the Xeelee, and the Xeelee's own cosmos-spanning war with dark matter entities called Photino Birds. The series features many other species and civilizations that play a prominent role, including the Squeem (a species of group-mind aquatics), the Qax (beings whose biology is based on the complex interactions of convection cells), and the Silver Ghosts (symbiotic organisms encased in reflective shells). Several stories in the Sequence also deal with humans and posthumans living in extreme conditions, such as at the heart of a neutron star (Flux), in a separate universe with considerably stronger gravity (Raft), and within eusocial hive societies (Coalescent).[3][4][5]

The Xeelee Sequence deals with many concepts stemming from the fringe of theoretical physics and futurology, such as exotic-matter physics, naked singularities, closed timelike curves, multiple universes, hyperadvanced computing and artificial intelligence, faster-than-light travel, and the upper echelons of the Kardashev scale. Thematically, the series deals heavily with certain existential and social philosophical issues, such as striving for survival and relevance in a harsh and unknowable universe and the effects of war and militarism on society.[6][7]

As of August 2018, the series is composed of 9 novels and 53 short pieces (short stories and novellas, with most collected in 3 anthologies), all of which fit into a fictional timeline stretching from the Big Bang's singularity of the past to the eventual heat death of the universe and Timelike Infinity's singularity of the future.[8] An omnibus edition of the first four Xeelee novels (Raft, Timelike Infinity, Flux, and Ring), entitled Xeelee: An Omnibus, was released in January 2010.[9] In August 2016, the entire series of all novels and stories (up to that date) was released as one volume in e-book format entitled Xeelee Sequence: The Complete Series.[10] Baxter's Destiny's Children series is part of the Xeelee Sequence.

Conception

Baxter first conceived of the Xeelee while hobby writing a short story in the summer of 1986 (eventually published in Interzone as "The Xeelee Flower" the following year). He incorporated powerful off-stage aliens to explain the story's titular artifact, and in pondering the backstory began to flesh out the basics of what would later become the main players and setting of the Sequence: a universe full of intelligent species that live in the shadow of the incomprehensible and god-like Xeelee.[11]

Plot overview

The overarching plot of the Xeelee Sequence involves an intergalactic war between humanity and the Xeelee, and a cosmic war between the Xeelee and the Photino Birds, with the latter two being alien species that originated in the early universe. The technologically advanced Xeelee primarily inhabit supermassive black holes, manipulating their event horizons to create preferable living environments, construction materials, tools, and computing devices. The Photino Birds are a dark matter-based species that live in the gravity wells of stars, who are likely not aware of baryonic life forms due to dark matter's weak interactions with normal matter. Due to the inevitable risk of their habitats being destroyed by supernovae and other consequences of stellar evolution, the Photino Birds work to halt nuclear fusion in the cores of stars, prematurely ageing them into stable white dwarfs. The resulting dwarfs provide them with suitable habitats for billions of times longer than other types of stars could, but at the expense of other forms of life on nearby planets. The Photino Birds' activities also effectively stop the formation of new black holes due to a lack of Type II supernovae, threatening the existence of the Xeelee and their cosmic projects.

After overcoming a series of brutal occupations by extraterrestrial civilizations, humanity expands into the galaxy with an extremely xenophobic and militaristic outlook, with aims to exterminate other species they encounter. Humans eventually become the second-most advanced and widespread civilization in the Milky Way galaxy, after the Xeelee. Unaware of the Photino–Xeelee war and the existential ramifications of what is at stake, humanity come to the (unwarranted) conclusion that the Xeelee are a sinister and destructive threat to their hegemony and security. Through a bitter war of attrition, humans end up containing the Xeelee to the galactic core. Both humans and the Xeelee gain strategic intelligence by using time travel as a war tactic, through the use of closed timelike curves, resulting in a stalemate for thousands of years. Eventually, humanity develops defensive, movable pocket universes to compartmentalize and process information, and an exotic weapon able to damage the ecological stability of the core's supermassive black hole. Minutes after the first successful strike, the Xeelee withdraw from the galaxy, effectively ceding the Milky Way to fully human control. Humanity continued to advance technologically for a hundred thousand years afterwards, then attacked the Xeelee across the Local Group of galaxies. However, despite having annoyed the Xeelee enough to give up activities in the Milky Way, humans, having become an extremely powerful Type III civilization themselves at this point, prove only to be a minor distraction to the Xeelee on the whole, being ultimately unable to meaningfully challenge their dominance across the universe.

Although the Xeelee are masters of space and time capable of influencing their own evolution, they are ultimately unsuccessful in stopping the Photino Birds. They instead utilize cosmic strings to build an enormous ring-like structure (which comes to be known as Bolder's Ring, or simply the Ring) to permit easy travel to other universes, allowing them and other species to escape the Photino Birds' destruction of the universe. The Xeelee, despite their unapproachable aloofness and transcendent superiority, appear to be compassionate and charitable toward the younger and less advanced species that inhabit the universe, demonstrating this by doing such things as constructing a specially-made universe suited to the Silver Ghosts, who humans had nearly driven to extinction. Humans are likewise shown compassion by them and allowed to use the Ring to escape, despite their relentless long war against the Xeelee.

Books

Xeelee Sequence main novels
Title Publication year Notes
Raft 1991 Nominated for the 1992 Arthur C. Clarke Award and Locus Award for Best First Novel[12]
Timelike Infinity 1992
Flux 1993
Ring 1994
Vacuum Diagrams 1997 A collection of short work (see below)
Xeelee: Endurance 2015 A collection of short work (see below)
Xeelee: Vengeance[13] 2017
Xeelee: Redemption[14] 2018

Destiny's Children sub-series novels
Title Publication year Notes
Coalescent 2003 Arthur C. Clarke Award nominee, 2004[15]
Exultant 2004
Transcendent 2005 John W. Campbell Memorial Award nominee, 2006[16]
Resplendent 2006 A collection of short work (see below)

Collections of short stories and novellas
Title Publication year Stories contained
(individual publication year)		 Notes
Vacuum Diagrams 1997
  • "The Sun-People" (1993)
  • "The Logic Pool" (1994)
  • "Gossamer" (1995)
  • "Cilia-of-Gold" (1994)
  • "Lieserl" (1993)
  • "Pilot" (1993)
  • "The Xeelee Flower" (1987)
  • "More Than Time or Distance" (1988)
  • "The Switch" (1990)
  • "Blue Shift" (1989)
  • "The Quagma Datum" (1989)
  • "Planck Zero" (1992)
  • "Eve (The Soliton Star)" (1996)
  • "The Gödel Sunflowers" (1992)
  • "Vacuum Diagrams" (1990)
  • "Stowaway" (1991)
  • "The Tyranny of Heaven" (1990)
  • "Hero" (1995)
  • "Secret History" (1991)
  • "Shell" (1987)
  • "The Eighth Room" (1989)
  • "The Baryonic Lords" (1991)
 Philip K. Dick Award winner, 1999[17]
Resplendent 2006
  • "Cadre Siblings" (2000)
  • "Conurbation 2473" (2003)
  • "Reality Dust" (2000)
  • "Mayflower II" (2004)[b]
  • "All in a Blaze" (2003)
  • "Silver Ghost" (2000)
  • "The Cold Sink" (2001)
  • "On the Orion Line" (2000)
  • "Ghost Wars" (2006)
  • "The Ghost Pit" (2001)
  • "Lakes of Light" (2005)
  • "Breeding Ground" (2003)
  • "The Dreaming Mould" (2002)
  • "The Great Game" (2003)
  • "The Chop Line" (2003)
  • "In the Un-Black" (2001)
  • "Riding the Rock" (2002)
  • "Between Worlds" (2004)
  • "The Siege of Earth" (2006)
Xeelee: Endurance 2015
  • "Return to Titan" (2010)
  • "Starfall" (2009)
  • "Remembrance" (2007)
  • "Endurance" (2015)
  • "The Seer and the Silverman" (2008)
  • "Gravity Dreams" (2011)
  • "PeriAndry’s Quest" (2004)
  • "Climbing the Blue" (2005)
  • "The Time Pit" (2005)
  • "The Lowland Expedition" (2006)
  • "Formidable Caress" (2009)

Currently uncollected stories
Title and publication year Source of first publication Notes
"The Venus Generations" (2016)[18] Bridging Infinity, edited by Jonathan Strahan

Chronology and reading order

The novels in chronological order (as opposed to publication order) are given below. Some of the novels contain elements occurring at different points in the timeline. The story anthologies (Vacuum Diagrams, Resplendent, and Xeelee: Endurance) each contain stories taking place across the entire chronology.

Title Publication year Year(s) in chronology
(common era)		 Notes
Coalescent 2003 476–2005 Part 1 of Destiny's Children
Transcendent 2005 2047 Part 3 of Destiny's Children ; the world of Michael Poole Bazalget
Xeelee: Vengeance 2017 3646–3665 Set in an alternate timeline
Timelike Infinity 1992 3717 Majority of the plot concerns events that begin here, with later major events occurring in 3829 and the 5000s. The final chapter takes place mainly in c. 5,000,000.
Ring 1994 3951 Before Great Northern launches
Xeelee: Redemption 2018 4106 – c. 5,000,000,000 Set in the same alternate timeline as Xeelee: Vengeance
Exultant 2004 24,973 Part 2 of Destiny's Children
Raft 1991 104,858
Flux 1993 c. 193,700
Transcendent 2005 c. 500,000 Part 3 of Destiny's Children; the world of Alia
Ring 1994 c. 5,000,000 After Great Northern returns

In 2009, Baxter posted a detailed chronology of the Xeelee Sequence explaining the proper chronological reading order of all the novels, novellas, and short stories up to that year. The timeline was updated in September 2015.[19]

When asked directly for a suggested reading order, the author wrote: "I hope that all the books and indeed the stories can be read stand-alone. I'm not a great fan of books that end with cliff-hangers. So you could go in anywhere. One way would be to start with Vacuum Diagrams, a collection that sets out the overall story of the universe. Then Timelike Infinity and Ring which tell the story of Michael Poole, then Raft and Flux which are really incidents against the wider background, and finally Destiny's Children."[20]

Reception

Science fiction author Paul J. McAuley has praised Baxter and the series, saying:

Baxter doesn’t shrink from tackling the dismayingly inhuman implications of vast abysses of past or future time, but the universality of life introduces perspective, motion and plot into every part of his Stapledonian cosmological framework.

It is great, heady, mind-bending stuff, meticulously mapped onto cutting edge speculations about the birth pangs of the universe and the ultimate fate of all known time and space, constantly enlivened and driven forward by the narratives that its vast range of life generates.

[It represents an] accomplished and imaginative exploration, expansion and reworking of SF’s core themes. His characters contest for living space with a panoply of bizarre aliens in a galaxy crammed with ancient wonders and secret histories; his stories reinvent the baroque excesses of space opera and brace them with imaginative exploration of ideas from stellar zoology, cosmology, quantum theory, exotic mathematics, and much else. Narratives froth with moments of shock and awe, and those sudden reversals of scale that induce the metaphysical dizziness sometimes called sense of wonder. Sentences stride confidently across centuries; paragraphs encompass millennia. Individual voices carry the story forwards, but the story is always bigger than the individuals that are caught up in it.[21]

gollark: μgollark: Remy.
gollark: Yes, you cannot send empty messages.
gollark: Before I can answer that, let's go on an extremely long tangent into epistemology.
gollark: A tensor is something which transforms like a tensor, if you must know.
gollark: Ah, heavdronic escrow?

See also

Notes
  • ^a Baxter cites the pronunciation "ch-ee-lee" in Xeelee: Vengeance. It's unclear why, given the history of the author himself pronouncing it as "zee-lee", but one possible reason is that it reflects how the name came to be pronounced in-universe due to language change, especially considering Baxter's prior references to glottochronology in the series.
  • ^b Winner of the BSFA Award for Best Short Fiction, 2004[22]

References
  1. "Stephen Baxter Lecture". Youtube.com.
  2. "Stephen Baxter Interview". Youtube.com.
  3. "Flux". FantasticFiction.com. Retrieved 22 June 2019.
  4. "Raft". FantasticFiction.com. Retrieved 22 June 2019.
  5. "Coalescent". Penguin Random House. Retrieved 22 June 2019.
  6. "Orionbooks.co.uk - Xeelee Sequence". Gollancz. Retrieved 22 March 2017.
  7. "The origin of the Destiny's Children series". stephen-baxter.com. Retrieved 28 August 2016.
  8. "The Xeelee Sequence – Timeline". stephen-baxter.com. Retrieved 29 September 2011.
  9. "Books". stephen-baxter.com. Retrieved 1 March 2012.
  10. "Orionbooks.co.uk - Xeelee Sequence". Gollancz. Retrieved 29 January 2017.
  11. "The Origin of the Xeelee Universe". stephen-baxter.com. Retrieved 1 April 2016.
  12. "1992 Award Winners & Nominees". Worlds Without End. Retrieved 3 August 2009.
  13. "Orionbooks.co.uk - Xeelee: Vengeance". Gollancz. Retrieved 29 January 2017.
  14. "Orionbooks.co.uk - Xeelee: Redemption". Gollancz. Retrieved 21 April 2018.
  15. "2004 Award Winners & Nominees". Worlds Without End. Retrieved 3 August 2009.
  16. "2006 Award Winners & Nominees". Worlds Without End. Retrieved 3 August 2009.
  17. "1999 PKD Award Winners & Nominees". Worlds Without End. Retrieved 28 August 2016.
  18. "Stephen Baxter on "The Venus Generations"". Coode Street. Retrieved 18 April 2017.
  19. "The Xeelee Sequence - Timeline". stephen-baxter.com.
  20. "Fiction Excerpts and Interviews". themanifold.co.uk. Archived from the original on 2 October 2006.CS1 maint: BOT: original-url status unknown (link)
  21. McAuley, Paul (January 2010). "Introduction". In Baxter, Stephen (ed.). Xeelee: An Omnibus. Gollancz. pp. viii–ix. ISBN 978-0575090415.
  22. "BSFA Awards - Previous Award Winners". British Science Fiction Association. Retrieved 28 August 2016.
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