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Built on ISFDB, Wikipedia, Wikidata and Open Library. Curated reading orders carry their reasoning on the page; the rest follow publication order. Data sources & licenses

© Loreful · data: ISFDB · CC BY

More like Alien Sky

anchored on:science fictionfar futurespaceother star systems

but

Mood

The mood the book leaves you in.

  • The reading experience is propelled by journeys, exploration, and physical risk; excitement and forward momentum dominate over dread or introspection.
  • Joy and loss are deliberately mixed; the resolution grants characters something real while taking something else away, leaving warmth and sorrow together.
  • The book demands work from the reader — dense prose, difficult structure, unfamiliar ideas, or morally uncomfortable material — as part of its intended effect.
  • Grim events, cruelty, or despair dominate the atmosphere, and the book does not soften them with comfort or comic relief.
  • The atmosphere is quietly unsettling — wrongness, unease, and the uncanny pervade the book without necessarily escalating into overt horror.
  • The book is built to move the reader; character feeling is foregrounded and major scenes aim at a strong emotional response.
  • Humor is a primary aim and the prose plays for laughs — comic situations, wit, or dialogue produce sustained comedy, not occasional levity.
  • The book insists that things can improve; effort and decency are shown to matter, and the arc bends toward better outcomes even through hardship.
  • The book teaches as it goes — real facts, history, science, or craft are conveyed in enough depth that learning is part of the reading experience.
  • The book is designed to uplift and motivate, presenting perseverance or achievement in a way that invites the reader to aspire or act.
  • The overall register is cheerful and easygoing; stakes are kept gentle and the book avoids dwelling on pain or dread.
  • Withheld information drives the experience; the book sustains enigmas and secrets the reader wants resolved, whatever its genre.
  • The book is contemplative and inward-looking, giving more weight to thought, memory, and meaning than to external events.
  • The book works as comfort reading — low tension, a soothing pace, and an atmosphere the reader can unwind in.
  • Grief, loss, or melancholy set the dominant register, and the book lets sorrow stand rather than resolving it into comfort.
  • Sustained suspense is the point; the book keeps the reader braced for what happens next through danger, pressure, or impending revelation.
  • Playful invention and charm define the register — fanciful conceits, light absurdity, and a narration that delights in its own oddity.

About

What the story runs on.

  • Stories in which extraterrestrial beings are central — as characters, cultures, or the object of the plot.
  • Stories about venturing into space to explore — survey missions, astronauts, and the frontier of the unknown beyond Earth.
  • Stories about minds with paranormal abilities — telepathy, telekinesis, precognition, empathy — and how societies handle those who have them.
  • Stories structured as a quest — a journey undertaken to find, deliver, or destroy something of great import.
  • Stories in which staying alive against nature, catastrophe, or scarcity is the central problem.
  • Stories of lovers kept apart by law, family, faith, or station, where the obstacle to love is the plot.
  • Stories in which a friendship — its making, testing, or loss — is the emotional center.
  • Stories of growing up — a young protagonist crossing from childhood into adult knowledge and responsibility.
  • Stories about who a character truly is — self-discovery, doubled lives, and the search for a self.
  • Stories driven by maneuvering for power — factions, conspiracies, and statecraft conducted in shadow.
  • Stories in which war itself is the subject — combat, occupation, and what warfare does to soldiers and civilians.
  • Stories organized around investigating a killing — the case, the clues, and the pursuit of the killer, in any genre's clothing.

Shelf

Where it sits in the library.

    • Fiction built on magic or other supernatural elements that have no scientific explanation.
    • Secondary-world fantasy at large scale, where the fate of nations or the world turns on the protagonists' struggle.
    • Fantasy set in a recognizably modern city or contemporary world where the supernatural intrudes on everyday life.
    • Fantasy that blends in horror's atmosphere and imagery, keeping a fantastical frame around grim or frightening material.
    • Action-driven fantasy following warriors or rogues with personal stakes against sorcerous threats, rather than world-spanning conflicts.
    • Fantasy set in a real historical period or a close analogue of one, with magic woven into the era.
    • Fantasy in which protagonists cross from the ordinary world into another world through a portal or similar passage.
    • Fiction that retells or reworks a traditional fairy tale in a new form or setting.
    • Fantasy drawing directly on myths, legends, and folklore, retelling them or building on their figures and logic.
    • Fantasy of ghosts, vampires, shapeshifters, psychics, and similar phenomena, usually set in an otherwise ordinary world.
    • Fiction mixing science-fictional trappings with overtly magical or impossible elements in one setting.
    • Low-stakes fantasy emphasizing comfort, community, and everyday pleasures over conflict and peril.
    • Speculative fiction of pervasive moral ambiguity, violence, and cynicism that rejects heroic conventions — fantasy and SF alike.
      • Fiction that extrapolates from science and technology — future societies, space travel, or speculative inventions — within at least nominally natural laws.
      • Science fiction of interstellar scope — starships, galactic polities, and adventure across star systems.
      • Science fiction committed to scientific rigor, where technical plausibility constrains the story.
      • Science fiction centered on armed forces and warfare, told largely from a military point of view.
      • Science fiction of networked, corporate-dominated near futures, pairing high technology with social decay.
      • Science fiction styled on nineteenth-century steam-powered technology, often in a Victorian or pseudo-Victorian setting.
      • Fiction depicting an oppressive or catastrophic society, presented as a warning.
      • Fiction set after civilization's collapse, following survivors in the ruins of the old world.
      • Fiction in which characters move between past and future, and the mechanics or consequences of that travel drive the plot.
      • Fiction exploring a world where a historical event went differently and history diverged from ours.
      • Science fiction about humanity's first encounter and communication with an alien intelligence.
      • Science fiction in which extraterrestrial forces attack or occupy Earth and humanity resists.
      • Fiction whose primary aim is to frighten or unsettle the reader through dread, menace, or the monstrous.
      • Horror of vast, indifferent, incomprehensible entities before which humanity is insignificant, in the Lovecraft tradition.
      • Horror of decaying houses, buried family secrets, and oppressive atmosphere in the Gothic literary tradition.
      • Horror centered on hauntings and the returning dead.
      • Horror located in the mind — paranoia, obsession, and unreliable perception rather than external monsters.
      • Horror built around the reanimated dead and survival amid their outbreaks.
      • Horror defined by explicit, transgressive gore that refuses to cut away from violence.
      • Speculative fiction of the strange and uncanny that resists both natural explanation and standard genre categories.
      • Fiction organized around solving a crime or puzzle, typically following an investigator toward the identification of a culprit.
      • A puzzle-first mystery that lays out clues so the culprit's identity can be deduced before the reveal.
      • Crime fiction of moral ambiguity, fatalism, and hard-edged style, set among the corrupt and the doomed.
      • A mystery following the realistic routines of police work — forensics, interviews, and case-building.
      • A gentle mystery with an amateur sleuth, a small community, and violence kept off the page.
      • A mystery set in a past era, where the investigation works within that period's methods and society.
      • Fast-paced fiction driven by imminent danger, pursuit, or high-stakes conspiracy, built to sustain tension.
      • A thriller of espionage — agents, tradecraft, and intelligence services in conflict.
      • A thriller centered on lawyers and the courtroom, where litigation carries the suspense.
      • A thriller driven by detailed contemporary or near-future technology, often military or scientific.
      • A thriller whose tension comes from mental states and manipulation between characters rather than external action.
      • Fiction whose central plot is a romantic relationship and its development toward an emotionally satisfying resolution.
      • Romance in which one or both partners are supernatural beings, blending fantasy elements into the love story.
      • A fantasy-romance hybrid in which the romantic arc and the fantasy plot carry equal weight.
      • Romance set in a past era, with courtship shaped by the period's society and manners.
      • Romance set in the present day, without supernatural or historical elements.
      • Fiction set in a real past period, where the historical setting materially shapes characters and events.
        • General and literary fiction emphasizing prose style, character interiority, or formal ambition over genre plot conventions.
        • Fiction in a realistic world where magical events occur and are treated as ordinary, in the tradition of Latin American literature.
        • Fiction that ridicules people, institutions, or society in order to criticize them.
        • Fiction of dreamlike, irrational imagery and logic that breaks from realistic representation.
        • Fiction that plays with narrative convention through metafiction, fragmentation, and self-reference.
        • Fiction propelled by journeys, exploration, and physical peril, where action and survival carry the plot.
        • Adventure fiction of ships and seafaring — naval engagements, voyages, and life at sea.
        • Fiction of the American frontier West — gunmen, ranchers, and lawmen, typically in the late nineteenth century.
        • Fiction centered on soldiers, campaigns, and the experience of warfare, historical or imagined.
          • Fiction written primarily to amuse, using comedic situations, wit, or parody as its organizing principle.
            • Multi-generational fiction following a family or dynasty across decades, with inheritance and kinship as the through-line.
              • Fiction whose world runs on explicit game mechanics — levels, stats, and skills that characters can see and exploit.
                • Fiction about costumed or superpowered heroes and their conflicts with comparable villains.

                Practical

                How long a commitment, whether it stands alone, and whether it has finished.

                Tap a chip to ask for it · tap again to rule it out · once more to clear. Numbers show what would be left.

                • Cover of Berserker (Fred Saberhagen)
                  Berserker (Fred Saberhagen)

                  series · 59 books · 1963

                  similar byscience fictiontensefar futureartificial intelligencerobotsspaceother star systemsspace opera

                  The Berserker series is a series of space opera science fiction short stories and novels by Fred Saberhagen, in which robotic self-replicating machines strive to destroy all life.

                • Cover of Ian Cormac
                  Ian Cormac

                  series · 6 books · 2001

                  part of Polity

                  similar byscience fictiontensefar futureartificial intelligencespaceother star systemsspace opera+2 more

                  Neal Asher's Ian Cormac novels (Gridlinked, The Line of Polity, Brass Man, Polity Agent, Line War, plus the earlier-set prequel Shadow of the Scorpion) follow Ian Cormac, an agent of Earth Central Security in Asher's Polity universe. Gridlinked opens with Cormac investigating a destroyed matter-transmitter on a remote colony while wrestling with the personality erosion caused by long-term neural linkage to the Polity's AI network; the following novels escalate into interstellar conflict with the alien Prador. Together they form the core action sequence of Asher's wider Polity series.

                • Cover of Moties
                  Moties

                  series · 4 books · 1974

                  part of CoDominium

                  similar byscience fictionfar futurespaceother star systemsaliensspace opera+3 more

                  Larry Niven and Jerry Pournelle's The Mote in God's Eye (1974) depicts humanity's first contact with an alien species, the Moties, set within the far-future interstellar setting of Pournelle's codominium future history. The Gripping Hand continues that first-contact crisis years later, and Outies, written by J. R. Pournelle, carries the story forward into a new generation. Together the three books trace an escalating encounter between human and Motie civilizations within the codominium universe.

                • HC
                  Heaven Chronicles / Zones of Thought

                  series · 8 books · 1976

                  similar byscience fictionfar futurespacespace opera+4 more

                • Cover of Ender Wiggin
                  Ender Wiggin

                  series · 14 books · 1977

                  part of Ender's Game Universe

                  similar byscience fictionfar futureother star systemsaliens+4 more

                  Orson Scott Card's Ender's Game (1985, expanded from his 1977 novella) follows child prodigy Andrew "Ender" Wiggin as he is recruited into a military training program built to prepare Earth's defenses for an anticipated third war against an insectoid alien species known as the Formics. The saga continues years later through Speaker for the Dead and Xenocide, following an older Ender as he confronts the moral weight of his role in that earlier conflict, and concludes the core arc in Children of the Mind, with Ender in Exile filling in the years between the first two books. Set within the wider Ender's Game universe, the series shifts from military coming-of-age story to slower, more philosophical science fiction as it progresses.

                • Cover of Dune Universe
                  Dune Universe

                  universe · 78 books · 1963

                  Start hereDune · Start here

                  similar byscience fictionfar futureother star systemsspace opera+1 more

                  Arrakis. Dune. The desert planet, where empire runs on a single substance: the spice melange, which folds space, prolongs life, and unlocks prescience, and which exists nowhere else in the known universe. Frank Herbert's saga is a meditation dressed as an adventure — feudal houses and a secret sisterhood, engineered messiahs and the patient ecology of a world without water, all turning on the terrible gravity of who commands the spice. It reads like scripture and schemes like a war room, ten thousand years hence, among people who have outlawed the thinking machine and made instruments of themselves instead. At its heart stand Herbert's original six — Dune, Dune Messiah, Children of Dune, God Emperor of Dune, Heretics of Dune, Chapterhouse: Dune — a single deepening arc across millennia, arguing the whole way between prophecy and free will. Around that spine his son Brian Herbert and Kevin J. Anderson have raised a vast prequel architecture: Prelude to Dune, tracing the great houses a generation before Paul; Legends of Dune, reaching back to the crusade that broke the machines; the Schools of Dune cycle on the founding of Bene Gesserit, Mentat, and Navigator; the Caladan Trilogy and Heroes of Dune filling years the originals left in shadow. Many hands, dozens of volumes, one desert. What sets Dune apart is its refusal of the simple: religion is manufactured, heroes are hazards, and the sand itself — worm, water, ecology — acts as a political power. Begin where the universe did, with Frank Herbert's Dune (1965), and read the original six in order; you need nothing else to feel the full weight. The prequels are a country to explore afterward, taken by era. Beginnings are delicate times.

                • Cover of Foundation Universe
                  Foundation Universe

                  universe · 123 books · 1940

                  Start hereFoundation · Start here

                  similar byscience fictionrobotsfar future+2 more

                  There is a science that reads the future of quadrillions the way an astronomer reads the orbits of stars. It is called psychohistory, and its equations foresee something the ruling Galactic Empire cannot admit: the throne is rotting, and thirty thousand years of barbarism are coming. One man, Hari Seldon, cannot stop the fall. He can only shorten it — by seeding a Foundation of scholars at the rim of the galaxy, a fragile institution built to carry knowledge across the dark and cut the interregnum to a single millennium. This is a universe told in the register of history itself: the long view, the calm of deep time, empires measured in centuries and men measured against them. The spine is Asimov's original trilogy — Foundation, Foundation and Empire, Second Foundation — followed decades later by the sequels Foundation's Edge and Foundation and Earth and the prequels Prelude to Foundation and Forward the Foundation. Late in life Asimov braided this in with his other future histories: the Robot novels of detective Elijah Baley and his humaniform partner R. Daneel Olivaw (The Caves of Steel, The Naked Sun, The Robots of Dawn, Robots and Empire) and the early Galactic Empire novels (Pebble in the Sky and its kin), until one continuous chronicle ran from the first thinking robots to the Second Empire. Other hands extend it — the Second Foundation Trilogy by Gregory Benford, Greg Bear, and David Brin, and shared-world spinoffs such as Robot City — so the corpus sprawls beyond a single author's tidy shelf. What distinguishes it is that the drama is intellectual: crises resolved by insight, nerve, and dialogue rather than fleets and blades, each turn hinging on the hidden logic of the Seldon Plan. Begin where readers have always begun — with Foundation, and the original trilogy in publication order. The rest opens outward from there.

                • Cover of Humanity's Fire
                  Humanity's Fire

                  series · 5 books · 2009

                  similar byscience fictionfar futureother star systemsspacespace opera+4 more

                  Michael Cobley's Humanity's Fire trilogy, opening with Seeds of Earth, follows the descendants of a human colony that lost contact with Earth generations earlier, who must contend with returning Earth authorities, alien empires, and a buried ancient danger beneath their adopted homeworld. Two further novels, Ancestral Machines and Splintered Suns, continue the setting afterward.

                • Cover of Commonwealth Saga
                  Commonwealth Saga

                  series · 2 books · 2004

                  part of Commonwealth Universe

                  similar byscience fictiontensefar futurealiensspace opera+5 more

                  The Commonwealth Saga is a series of science fiction novels by British science fiction writer Peter F. Hamilton. This saga consists of the novels Pandora's Star (2004) and Judas Unchained (2005). Hamilton has also written several books set in the same literary universe. Misspent Youth (2002) takes place 340 years before the events of Pandora's Star. The Void Trilogy, consisting of The Dreaming Void (2008), The Temporal Void (2009), and The Evolutionary Void (2010), takes place 1,200 years after the events of Judas Unchained; several of the main characters from Judas Unchained and Pandora's Star also appear in the Void trilogy.

                • Cover of Uplift
                  Uplift

                  series · 5 books · 1980

                  part of Uplift Universe

                  similar byscience fictionfar futureother star systemsspaceadventurousaliensspace opera+2 more

                  David Brin's Uplift trilogy opens with Sundiver, sending human explorers into the Sun itself, then follows a dolphin-crewed starship on the run from hostile aliens in Startide Rising and a fight over the colony world Garth in The Uplift War. The books sit inside Brin's wider Uplift Universe, built on the idea that spacefaring "patron" species genetically engineer younger "client" species into full sapience, with humanity an anomaly that reached the stars without a patron of its own.

                • Cover of Against a Dark Background
                  Against a Dark Background

                  Iain M. Banks · standalone novel · 1993

                  similar byscience fictiontensefar futurespaceother star systemsadventurousspace opera+1 more

                  The daughter of an impoverished noble house and her squad of soldiers become thieves of antiquities; long after their retirement and separation she must assemble them again in order to find and steal the most powerful weapon ever created, or pay with her life.

                • T
                  Thistledown

                  series · 5 books · 1978

                  completed

                  similar byscience fictionfar futurespacespace exploration+4 more

                • Cover of Old Man's War
                  Old Man's War

                  series · 16 books · 2005

                  similar byscience fictionfar futurespaceother star systemsadventurousspace opera+2 more

                  The Old Man's War series is a series of science fiction novels by John Scalzi. The first book in the series, Old Man's War, was first published in 2005 by Tor Books, and was nominated for the Hugo Award for Best Novel in 2006. In 2026 it was a finalist for the Hugo Award for Best Series.

                • Cover of Dune
                  Dune

                  series · 20 books · 1963

                  part of Dune Universe

                  similar byscience fictionfar futureother star systemsspace opera+1 more

                  Frank Herbert's Dune Chronicles opens with 1965's Dune, set on the desert planet Arrakis where House Atreides takes control of the only source of the vital spice melange and young Paul Atreides is pulled into a struggle over its politics and religion. Herbert carried the story forward across five further novels — Dune Messiah, Children of Dune, God Emperor of Dune, Heretics of Dune, and Chapterhouse: Dune — following Paul's line over the following millennia, before Brian Herbert and Kevin J. Anderson later extended the saga. Many other editions of these six novels are omnibus and box-set repackagings rather than separate stories.

                • Cover of Fifth Imperium
                  Fifth Imperium

                  series · 3 books · 1991

                  similar byscience fictiontensefar futureartificial intelligencespaceadventurousaliensspace opera+1 more

                  David Weber's Fifth Imperium series opens with the discovery that Earth's Moon is in fact a disguised alien starship, the Dahak, that has orbited undetected for tens of thousands of years - a relic of the fallen Fourth Imperium, a multi-star civilization destroyed while defending against the genocidal Achuultani. Mutineers' Moon follows humanity's first contact with Dahak and the mutineers still aboard it; The Armageddon Inheritance and Heirs of Empire escalate from that discovery into interstellar war and dynastic politics as humanity inherits the old empire's legacy and its enemies. The three novels were later collected as the omnibus Empire from the Ashes.

                • Cover of Uplift Universe
                  Uplift Universe

                  universe · 13 books · 1980

                  Start hereUplift · Start here

                  similar byscience fictionfar futurespaceother star systemsadventurousaliensspace opera+2 more

                  No species, the Galactics insist, ever climbs to sapience alone. For a billion years the elder races have "uplifted" their chosen clients — reshaping some promising animal, gene by patient gene, into a thinking being, then binding it through long ages of indenture. Patron lifts client; client one day becomes patron; and every lineage traces back through the vast Galactic Library to the vanished Progenitors who began it all. Then a ragged band of primates arrives at the stars with no patron to claim them — wolflings, self-made, an affront to a hundred thousand years of law — and worse, these humans have already started uplifting neighbors of their own: the neo-dolphins and neo-chimpanzees of Earthclan. David Brin builds this galaxy across two trilogies. The first — Sundiver, the Hugo- and Nebula-winning Startide Rising, and the Hugo-winning The Uplift War — sends an expedition into the Sun, then follows the dolphin-crewed survey ship Streaker as it flees a discovery that sets fanatical star-clans at war, and a chimp-led resistance on an invaded colony world. The second sequence, Uplift Storm — Brightness Reef, Infinity's Shore, Heaven's Reach — descends to Jijo, a forbidden world where six fallen races hide as illegal settlers, and draws every loose thread toward a reckoning. Short fiction fills the margins. This is space opera with an ecologist's conscience: teeming with invented biologies, wry cross-species banter, and real unease about what we owe the minds we make. Begin with Startide Rising — the saga's beating heart, and readable on its own — or take Sundiver first and read straight through in publication order.

                • Cover of Starstream
                  Starstream

                  series · 2 books · 1989

                  completed

                  similar byscience fictiontensefar futurespaceother star systemsspace opera+3 more

                  Starstream groups Jeffrey A. Carver's two linked science-fiction novels, From a Changeling Star (1989) and its direct sequel Down the Stream of Stars (1990). The two were published within a year of each other under the same author.

                • Cover of Forge of God
                  Forge of God

                  series · 2 books · 1987

                  completed

                  similar byscience fictiontensealiens+6 more

                  The Forge of God (1987) is Greg Bear's science fiction novel about Earth's discovery that it is the target of an incomprehensible, overwhelming alien attack, following scientists and ordinary people as they try to understand what is destroying the planet. Its 1992 sequel, Anvil of Stars, follows a group of young survivors sent on a mission of interstellar retaliation, continuing directly from the first book's ending.

                • Cover of Tower and the Hive
                  Tower and the Hive

                  series · 7 books · 1959

                  completed

                  part of The Talents

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                  The Tower and the Hive series opens with The Rowan (1990), following an isolated but powerful telepath who is drawn out of her loneliness by a psychic call for help from a distant Talent facing an alien threat. Anne McCaffrey continued the story across four more novels, Damia, Damia's Children, Lyon's Pride, and the concluding The Tower and the Hive (1999), following later generations of a telepathic family staffing the Prime Towers that give a starfaring human civilization instant communication. The series is set later in the same Talents universe as McCaffrey's earlier Pegasus books.

                • Cover of Bolo
                  Bolo

                  series · 46 books · 1960

                  similar byscience fictionfar futureother star systems+3 more

                  The Bolo books, created by Keith Laumer and continued by a rotating roster of collaborators including David Weber and S. M. Stirling, are set in a shared military science-fiction universe built around sentient, increasingly self-aware tank-like war machines called Bolos. Individual volumes range from Laumer's original story collections to later novels and anthologies exploring Bolos across different wars and eras, unified by the premise rather than a single continuous plot.

                • Cover of Ocean / Galactic Center
                  Ocean / Galactic Center

                  series · 12 books · 1972

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                  The Galactic Center Saga is a series of books by author Gregory Benford detailing a galactic war between mechanical and biological life.In the Ocean of Night (1977) — 1977 Nebula Award nominee, 1978 Locus Award nominee Across the Sea of Suns (1984) Great Sky River (1987) — 1988 Nebula Nominee Tides of Light (1989) — 1990 Locus Award nominee Furious Gulf (1994) Sailing Bright Eternity (1996) "A Hunger for the Infinite" a novella published in the anthology Far Horizons

                • Cover of Transformation
                  Transformation

                  series · 3 books · 2015

                  part of Polity

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                  Neal Asher's Transformation trilogy, set within his wider Polity universe, follows an AI mind investigating a black-ops project gone wrong, opening with Dark Intelligence. War Factory and Infinity Engine escalate the search into a hunt across a mechanized alien warzone left behind by an earlier conflict. As with Asher's other Polity fiction, the story favors large-scale, hard-edged space combat over character-driven drama.

                • Cover of Forever War
                  Forever War

                  series · 10 books · 1972

                  similar byscience fictionfar futurespace+3 more

                  Joe Haldeman's The Forever War (1974) follows a soldier conscripted into a centuries-long interstellar war against the alien Taurans, using relativistic space travel so that months spent in transit correspond to years or decades passing back on Earth. Haldeman later returned to the same conflict in Forever Peace (1997), a thematically connected but separate story, and Forever Free (1999), a direct sequel set years after the original war's end. The first novel won the Hugo, Nebula, and Locus awards and is considered a foundational work of military science fiction.

                • Cover of Heechee
                  Heechee

                  series · 19 books · 1972

                  completed

                  similar byscience fictionfar futurespaceother star systemsaliensspace explorationspace opera+1 more

                  The Heechee Saga, also known as the Gateway series, is a series of science fiction novels and short stories by Frederik Pohl. The Heechee are an advanced alien race that visited the Solar System hundreds of millennia ago and then mysteriously disappeared. They left behind bases containing artifacts, including working starships, which are discovered and exploited by humanity.