Spacefaring Civilizations are those which dominate technology to travel through interplanetary, interstellar, or even intergalactic space. Any civilization which has reached that level in development may be added here, even though some might have lost the technology afterwards.
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- A'askvarii
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- Ab'Ugartte
- Abbai
- Abductor
- Abductor (Star Trek)
- Acamarian
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- Achaia
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- Actuary Class
- Adam's species
- Admiral B'tang's species
- Advent
- Advozse
- Aegenan
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- Aemt
- Aeolian (K9)
- Aeolian (Lost in Space)
- Aesdherian
- Agent X's Species
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- Aileen's Species
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- Akaali
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- Akrennian
- Aksellan
- Aleena
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- Alflololian
- Alfur
- Algolian
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- Alibar
- Alien (A Close Encounter with a Strange Kind)
- Alien (Alien Apocalypse)
- Alien (Alien Hunter)
- Alien (Alien Opponent)
- Alien (Aliens: Earth Angel)
- Alien (Aliens: Incubation)
- Alien (Allegiance)
- Alien (Battle: Los Angeles)
- Alien (Chicken Little)
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- Alien (Dino Run)
- Alien (Dinosaurs vs. Aliens)
- Alien (Earth vs. the Flying Saucers)
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- Alien (Fine Tuning)
- Alien (Fire in the Sky)
- Alien (Gadget and the Gadgetinis)
- Alien (Gracefield Incident)
- Alien (Hellboy)
- Alien (High Plains Invaders)
- Alien (I Married a Monster from Outer Space)
- Alien (It Came from Outer Space)
- Alien (Laserblast)
- Alien (Life of Brian)
- Alien (Parents from Space)
- Alien (Plan 9 from Outer Space)
- Alien (Proximity)
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- Alien (Shaun the Sheep)
- Alien (Sherman's Lagoon)
- Alien (Signs)
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- Alien (Spielberg's War of the Worlds)
- Alien (Teenagers from Outer Space)
- Alien (The 27th Day)
- Alien (The Adventures of Tintin)
- Alien (The Ambassadors of Death)
- Alien (The Chameleon)
- Alien (The Invasion of the Scooby Snatchers)
- Alien (The Man from Planet X)
- Alien (The Mr. Men Show)
- Alien (The Watch)
- Alien (Turnabout Is Fair Play)
- Alien (Welcome to Camp Nightmare)
- Alien (When Aliens Attack)
- Alien (Xtro 3: Watch the Skies)
- Alien (Zenon: The Zequel)
- Alien (Zombies 3)
- Alien 3000
- Alien Agents (The Arrival, 1996)
- Alien Dragon (Dragon City)
- Alien Entities (Arma 3: Contact)
- Alien Groupie
- Alien Lurker Dragon
- Alkala
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- Allasomorph
- Allicon
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- Alphabetrian
- Alphan (Starship Invasions)
- Alpheron
- Altairian (The Twilight Zone)
- Alvarian
- Amoeba (Endless Space)
- Amphibian (Destination Inner Space)
- Amphicephalus
- Anasazi (Jonny Quest)
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- Ancient (Stargate)
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- Ancient Astronaut
- Ancient God
- Andalite
- Andoran
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- Androgum
- Andromedan (The Conquest of the Earth)
- Andromedan (The Six Million Dollar Man)
- Andronican
- Androsynth
- Angara
- Annunaki
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- Antarean
- Antarean (Lazer Team)
- Antareaner
- Antarian (Futurama)
- Antarian (Teenage Mutant Ninja Turtles)
- Antedean
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- Antican
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- Anubian (K9)
- Anunnaki
- Anurian
- Anx
- Aparoid
- Aphrodite's species
- Apician
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- Appoplexian
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- Aqualish
- Aquanog
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- Arachnian
- Arachnitect
- Arachno-sapien
- Arakshu
- Arbazan
- Arbryl
- Arcadian
- Arcadroid
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- Architect
- Arcon's species
- Arconan
- Arcosian
- Arcturian (Treasure Planet)
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- Ardusian
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- Argazdan
- Argenta
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- Aridian (Gilligan's Planet)
- Arilou Lalee'lay
- Ariolo
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- Arkonian
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- Arnassian
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- Arquillian
- Arretan
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- Arslycan
- Artisan Class
- Arysum-Kormn
- Asgard (Stargate)
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- Asogian
- Aspan
- Asteromorph
- Asuran
- Asymmetric Person
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- Atasian
- Atrian
- Attender Class
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- Aurigan
- Autocron
- Axanar
- Azin Mo