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We moved that one to Mile Long Ship when Planet Spaceship was in YKTTW. Despite the name, as per The New Essential Guide to Vehicles and Vessels, Vong worldships average 10 km in diameter.
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** Yuuzhan Vong "worldships" as well. Since the entire species lost their homeworld (and home galaxy, for that matter), they live on a flotilla of gigantic spherical spaceships. These lose prominence as the Vong start conquering and colonizing planets in the ''Star Wars'' galaxy.
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** Yuuzhan Vong "worldships" as well. Since the entire species lost their homeworld (and home galaxy, for that matter), they live on a flotilla of gigantic spherical spaceships. These lose prominence as the Vong start conquering and colonizing planets in the ''Star Wars'' galaxy.
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* Zonama Sekot in the ''Franchise/StarWarsExpandedUniverse'' is a case of attaching absolutely enormous hyperdrive engines to a [[GeniusLoci (sapient)]] Earthlike planet.
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* World Of Synnabar takes place in a spaceship made from a hollowed out Mars.
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* World ''World Of Synnabar Synnabar'' takes place in a spaceship made from a hollowed out Mars.
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* World Of Synnabar takes place in a spaceship made from a hollowed out Mars.
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* In ''Literature/TheWitchesOfKarres'', the so-called witches use their "Sheewash drive" to move the entire planet of Karres around when they need to.
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* ''ShadowRaiders'' feature a handful of planets with engines designed by an unknown precursor race.
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* ''ShadowRaiders'' ''WesternAnimation/ShadowRaiders'' feature a handful of planets with engines designed by an unknown precursor race.
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* ''ShadowRaiders'' feature a handful of planets with engines designed by an unknown precursor race.
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work names should be visible, not sinkholed
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* [[Franchise/SonicTheHedgehog The Death Egg]], being a parody of the Death Star. The intro of ''Sonic & Knuckles'' illustrates just how big it is--the Eggman face fills the top of a volcano (Lava Reef, to be exact).
to:
* [[Franchise/SonicTheHedgehog ''Franchise/SonicTheHedgehog'' has The Death Egg]], being Egg, a parody of the Death Star. The intro of ''Sonic & Knuckles'' illustrates just how big it is--the Eggman face fills the top of a volcano (Lava Reef, to be exact).
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* [[SonicTheHedgehog The Death Egg]], being a parody of the Death Star. The intro of ''Sonic & Knuckles'' illustrates just how big it is--the Eggman face fills the top of a volcano (Lava Reef, to be exact).
to:
* [[SonicTheHedgehog [[Franchise/SonicTheHedgehog The Death Egg]], being a parody of the Death Star. The intro of ''Sonic & Knuckles'' illustrates just how big it is--the Eggman face fills the top of a volcano (Lava Reef, to be exact).exact).
* The ''VideoGame/{{X}}-Universe'' series' backstory provides an extreme example. Billions of years ago the Ancients fought a several-million-year-long war against a [[JustForFun/AbusingTheKardashevScaleForFunAndProfit Kardashev Type V+]] race called the Outsiders who are believed to have invaded from another universe. They entered ours in the form of several ships that were each the size of a solar system. (Yeah, SufficientlyAdvancedAlien doesn't even begin to cover this.)
* The ''VideoGame/{{X}}-Universe'' series' backstory provides an extreme example. Billions of years ago the Ancients fought a several-million-year-long war against a [[JustForFun/AbusingTheKardashevScaleForFunAndProfit Kardashev Type V+]] race called the Outsiders who are believed to have invaded from another universe. They entered ours in the form of several ships that were each the size of a solar system. (Yeah, SufficientlyAdvancedAlien doesn't even begin to cover this.)
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** The Necron World Engine, unsurprisingly, is a Necron ship the size of a planet. An entire space marine chapter sacrificed itself to destroy it.
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** The Necron World Engine, unsurprisingly, is a Necron ship the size of a planet.planet (because they slapped an engine on a planet). An entire space marine chapter sacrificed itself to destroy it.
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* In ''Franchise/StarWars'', the ''Death Star'' is a moon-sized superweapon which is the original source of the ThatsNoMoon trope. For specificity's sake, the first Death Star was established as 160 kilometers in diameter, and the second would've been 900 kilometers if it hadn't been blown up first.
to:
* In ''Franchise/StarWars'', the ''Death Star'' is a moon-sized superweapon which is the original source of the ThatsNoMoon trope. For specificity's sake, the first Death Star was established as 160 kilometers in diameter, and the second would've been 900 kilometers or twice as big as the first one (there are contradictory reports) if it hadn't been blown up first.
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* The largest vessels in the ''Literature/PerryRhodan'' series fall under this trope. For instance the cosmocratic spore ships, spheres with a size of 1126 kilometers.
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* The largest vessels in the ''Literature/PerryRhodan'' series fall under this trope. For instance the cosmocratic spore ships, spheres with a size of 1126 kilometers. kilometers.
* ''Terre en fuite'' (''Fleeing Earth'') is a novel by François Bordes where Earth and Venus are turned into giant spaceships in order to allow humanity to escape the Sun going nova. Initially, the plan is to wait out the explosion behing Jupiter and come back. However, scientist then determine that the Sun will not return to its former state, so they have to move the planets to another system... and then again when the first one turns out to have a LostColony of humans.
* ''Terre en fuite'' (''Fleeing Earth'') is a novel by François Bordes where Earth and Venus are turned into giant spaceships in order to allow humanity to escape the Sun going nova. Initially, the plan is to wait out the explosion behing Jupiter and come back. However, scientist then determine that the Sun will not return to its former state, so they have to move the planets to another system... and then again when the first one turns out to have a LostColony of humans.
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correction
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* In Creator/RobertReed's ''Literature/GreatShip'' series, the Great Ship itself is an [[BigDumbObject ancient abandoned artifact]] which was claimed and settled by mankind's descendents. It is larger than Jupiter. The interior of the ship has [[StarshipLuxurious hundreds of thousands of enormous caverns which are inhabited by the passengers]]. The ship has nine adjustable fusion engines on one end, each of which is large enough to fit several dozen Earth-sized planets within their nozzles.
to:
* In Creator/RobertReed's ''Literature/GreatShip'' series, the Great Ship itself is an [[BigDumbObject ancient abandoned artifact]] which was claimed and settled by mankind's descendents. It is larger than Jupiter. The interior of the ship has [[StarshipLuxurious hundreds of thousands of enormous caverns which are inhabited by the passengers]]. The ship has nine fourteen adjustable fusion engines on one end, each of which is large enough to fit several dozen Earth-sized planets within their nozzles.
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* Creator/CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]]
to:
* Creator/CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]] ]]
* The largest vessels in the ''Literature/PerryRhodan'' series fall under this trope. For instance the cosmocratic spore ships, spheres with a size of 1126 kilometers.
* The largest vessels in the ''Literature/PerryRhodan'' series fall under this trope. For instance the cosmocratic spore ships, spheres with a size of 1126 kilometers.
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* [[SonicTheHedgehog The Death Egg]].
to:
* [[SonicTheHedgehog The Death Egg]].Egg]], being a parody of the Death Star. The intro of ''Sonic & Knuckles'' illustrates just how big it is--the Eggman face fills the top of a volcano (Lava Reef, to be exact).
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* ''DoctorWho'' has had one or two in its 50-year history. First, the Daleks ''attempted'' it in "The Dalek Invasion of Earth," but failed. The second, and somewhat more successful of these, was Zanak from "The Pirate Planet," a hollowed-out planet with massive transmat engines...it could materialize around another planet and capture ''everything'' from it, leaving behind a tiny husk, which its captain could collect as a trophy.
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* [[SonicTheHedgehog The Death Egg]].
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we already have that one; no need to list it twice! :)
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* The Great Ship in the ''Literature/GreatShip'' universe is a massive ship larger than Jupiter which has hundreds of thousands - or millions - of massive caverns, vacuum tube trains, and with space ports large enough to fit entire worlds inside. Even with billions of paying passengers aboard, [[UnnecessarilyLargeVessel most of the ship's space is almost totally unused]]. Since it was discovered streaking towards the Milky Way with signs of having flown through intergalactic space for at least a billion years, with no crew or even any records, it's [[BigDumbObject original purpose is totally unknown]].
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Example from Unnecessarily Large Vessel that also fits here
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* The Great Ship in the ''Literature/GreatShip'' universe is a massive ship larger than Jupiter which has hundreds of thousands - or millions - of massive caverns, vacuum tube trains, and with space ports large enough to fit entire worlds inside. Even with billions of paying passengers aboard, [[UnnecessarilyLargeVessel most of the ship's space is almost totally unused]]. Since it was discovered streaking towards the Milky Way with signs of having flown through intergalactic space for at least a billion years, with no crew or even any records, it's [[BigDumbObject original purpose is totally unknown]].
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* In ''Franchise/StarWars'', the ''Death Star'' is a moon-sized superweapon which is the original source of the ThatsNoMoon trope.
to:
* In ''Franchise/StarWars'', the ''Death Star'' is a moon-sized superweapon which is the original source of the ThatsNoMoon trope. For specificity's sake, the first Death Star was established as 160 kilometers in diameter, and the second would've been 900 kilometers if it hadn't been blown up first.
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* In ''Videogame/StarRuler'', the players can make ships anywhere from the size of a coke can to ships larger than the galaxy. At around ship scale 1000, ships start to become larger than the planets that build them. Additionally, it's possible to turn entire ''planets'' into ships by researching the Planetary Thruster. Building a bunch of planetary thrusters, some shield generators, and planetary laser cannons essentially turns the planet into a [[StoneWall ridiculously durable, but relatively poorly armed ship]] with the capacity to store thousands of smaller ships, or [[MookMaker build]] [[MobileFactory more ships]] on the way to its destination by importing goods from the galactic bank.
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I went ahead and moved the target page! :)
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* CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]]
to:
* CordwainerSmith Creator/CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]]
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None
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* Creator/CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]]
to:
* Creator/CordwainerSmith CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]]
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None
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* Creator/CordwainerSmith gives us The Golden Ship - A sphere 90 Million miles in length (short of an AU by 2 million miles). That's approximately a 100 times larger than Earth's sun! Extremely fast, it could move in seconds. [[spoiler: However, the Golden Ship is really a decoy, being mostly hollow and consisting of foam and wires. It has no weapons of its own, and must rely on its speed to survive.]]
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None
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* In the ''Series/StarTrekTheOriginalSeries'' ep. "The World is Hollow and I Have Touched the Sky" a group of aliens have been sequestered inside a large interstellar asteroid for so long that they have forgotten that they are actually inside one.
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* In the ''Series/StarTrekTheOriginalSeries'' ep. "The "For the World is Hollow and I Have Touched the Sky" a group of aliens have been sequestered inside a large interstellar asteroid for so long that they have forgotten that they are actually inside one.
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* In Series/{{Andromeda}} the Magog come from worlds (yes, that's plural) locked together in some kind of structure. The whole thing is mobile, and even contains an artificial sun!
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* In Series/{{Andromeda}} ''Series/{{Andromeda}}'' the Magog come from worlds (yes, that's plural) locked together in some kind of structure. The whole thing is mobile, and even contains an artificial sun!
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** The planet Gor itself is arguably this, since the Priest-Kings (the PhysicalGods of the planet) moved it to its current location 5 million years ago.
to:
** The planet Gor itself is arguably this, can be considered an example, since the Priest-Kings (the PhysicalGods of the planet) moved it to its current location 5 million years ago.
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* In Creator/RobertReed's ''Literature/GreatShip'' series, the Great Ship itself is an ancient abandoned artifact which was claimed and settled by mankind's descendents. It is larger than Jupiter.
to:
* In Creator/RobertReed's ''Literature/GreatShip'' series, the Great Ship itself is an [[BigDumbObject ancient abandoned artifact artifact]] which was claimed and settled by mankind's descendents. It is larger than Jupiter. The interior of the ship has [[StarshipLuxurious hundreds of thousands of enormous caverns which are inhabited by the passengers]]. The ship has nine adjustable fusion engines on one end, each of which is large enough to fit several dozen Earth-sized planets within their nozzles.
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folderized, link fix; Independence Day
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[[AC:Anime & Manga]]
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[[folder:Anime & Manga]]
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[[AC:Comic Books]]
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[[folder:Comic Books]]
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[[AC:Tabletop Games]]
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[[folder:Tabletop Games]]
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[[AC:Toys]]
* In ''Franchise/Bionicle'', Mata Nui was designed to observe other universes while having beings inside him functioning as NanoMachines in a sense. His HumongousMecha body is roughly forty million feet (7,575 mi or 12,192 km) tall and had a camouflage system that created an island on his face. Mata Nui was able to control specific things like gravity and light within his body.
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[[folder:Toys]]
* In
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[[folder:Video Games]]
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[[AC:Western Animation]]
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[[folder:Western Animation]]
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[[/folder]]
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There's big spaceships, there's ''[[MileLongShip gigantic]]'' spaceships, and then there's these: a space ship (or station) that's as big as a small planet or large moon[[note]] (Earth's moon is a ''very'' large moon)[[/note]]. In space, you have no external gravity to contend with[[note]], aside from [[http://en.wikipedia.org/wiki/Microgravity microgravity]][[/note]], so it's possible to build some truly humongous structures like this. Alternatively, you may just want to strap some engines onto an ''actual'' planet or moon and set off, although this may require SufficientlyAdvancedTechnology.
Often used for RuleOfCool, in which case it will overlap with CoolStarship, the Planet Spaceship is a great way to intimidate your foe, or to pack your entire population off when your home world is in trouble. May evoke a "ThatsNoMoon" reaction when it first appears.
Subtrope of MileLongShip. May be used as a BigDumbObject, TheBattlestar, or a GenerationShip. Commonly, though not exclusively, found in SpaceOpera. Compare DysonSphere and RingWorldPlanet. See also: UnnecessarilyLargeVessel, UnnecessarilyLargeInterior and AwesomeButImpractical.
----
!! Examples:
[[AC:Anime & Manga]]
* The Zentradi main base in ''Anime/SuperDimensionFortressMacross'' is hundreds of kilometers across. Of course, the Zentradi themselves are giants.
* There's a ship in the Raalgon fleet, in ''Anime/IrresponsibleCaptainTylor'', that causes Tylor himself to comment that it's "more like a planet than a ship".
* In ''Anime/TengenToppaGurrenLagann'', the final battle has the two sides fighting with ships that are on the same scale as ''galaxies!''
* ''Anime/TransformersCybertron'': The planet Primus can transform into a spaceship of sorts.
* In ''Manga/{{Outlanders}}'', Earth's moon is revealed to be a millennia-old ship, the superweapon called "Dola".
[[AC:Comic Books]]
* Taa II, the Worldship belonging to the MarvelComics character {{Galactus}}, and named after his ravaged homeland Taa, is the size of ''a solar system''.
* The Homeworld of the Evrons in ''PaperinikNewAdventures'': they turn it into a [[CrazyAwesome spaceship]].
[[AC:Film - Animated]]
* Titan, for which ''WesternAnimation/TitanAE'' is named, is a very large, spherical spaceship. When activated, it converts energy into mass and [[spoiler:turns into an actual planet.]]
[[AC:Film - Live Action]]
* In ''Franchise/StarWars'', the ''Death Star'' is a moon-sized superweapon which is the original source of the ThatsNoMoon trope.
* Spaceball One in the movie ''Film/{{Spaceballs}}'', a parody of ''Franchise/StarWars'', has a similar scale.
[[AC:Literature]]
* In the Ted Reynolds short story, "Ker-Plop", we get a reminder of the difference between size and volume, when humans return from the Magellanic Clouds in a ship that is ten thousand kilometers across (about 1/10th the diameter of Ceres). The agent sent to investigate realizes that because the ''entire volume'' is inhabited, rather than just the surface, this one ship contains more people than his ''entire galactic federation''. The decks are arranged concentrically, like an onion, and the first kilometer ''alone'' has nearly ''400'' decks, each with nearly ''the same surface area'' as the entire ship!
* In Creator/EEDocSmith's ''Literature/SkylarkSeries'', Drs. Seaton and Crane build a 1000km diameter spaceship called the ''Skylark of Valeron''. Its size was needed to house the sensors required to travel at its full velocity. Later, their rival Dr. [=DuQuesne=] builds an even bigger ship.
* In Creator/LarryNiven's ''Literature/KnownSpace'' series, the Pierson's Puppeteers have basically turned a star with five orbiting planets into a spaceship, and are using it to flee the explosion at the center of the galaxy.
* In the ''Literature/{{Gor}}'' series:
** The planet Gor itself is arguably this, since the Priest-Kings (the PhysicalGods of the planet) moved it to its current location 5 million years ago.
** The Kurii live in "Steel Worlds" in the asteroid belt; from there they plot their plans to destroy the Priest-Kings and take over Gor & Earth for themselves. The Steel Worlds have aritifical weather & daytime/nighttime and rotate to simulate gravity, with beings living on the inside circumferance of the ships. They used to have a planet of their own but they destroyed it making war with each other.
* From Iain M. Banks's ''TheCulture'' novels, the General Systems Vehicles. You know that bit at the beginning of Star Wars, where the Star Destroyer swallows up the Tantive IV into its docking bay? Picture a ship that could do that... to the Death Star. Twice.
* Creator/DavidWeber's ''EmpireFromTheAshes'' series has ''Dahak'' and all the other Imperial Planetoids. ''Dahak'' has spent the last 50,000 years pretending to be Earth's Moon... and it's the smallest of them. They come equipped with hundred kilometer thick armor and carry 80,000 ton battleships as parasite craft.
* In Creator/JohnVarley's ''Literature/GaeaTrilogy'', Gaea and her brood are [[LivingShip living space habitats]] large enough to be mistaken for additional moons of Saturn.
* In ''The City and the Stars'' by Creator/ArthurCClarke, it is revealed at the end that [[spoiler: most of the humanity left the Galaxy to explore the universe... in a star cluster made into a fleet.]]
* At the end of ''Literature/HaloTheColeProtocol'', the inhabitants of The Rubble, survivors of the Covenant invasion of their system, convert a large asteroid into an evacuation ship to get everyone safely to UNSC space.
* In ''Literature/{{Remnants}}'', the humans who awaken when the ship reaches a destination initially think they've landed on a bizarre alien world. They soon discover it's a massive spaceship controlled by a sentient AI that brought them aboard as a curiosity.
* In Creator/RobertReed's ''Literature/GreatShip'' series, the Great Ship itself is an ancient abandoned artifact which was claimed and settled by mankind's descendents. It is larger than Jupiter.
[[AC:Live-Action TV]]
* In Series/{{Andromeda}} the Magog come from worlds (yes, that's plural) locked together in some kind of structure. The whole thing is mobile, and even contains an artificial sun!
* In the ''Series/StarTrekTheOriginalSeries'' ep. "The World is Hollow and I Have Touched the Sky" a group of aliens have been sequestered inside a large interstellar asteroid for so long that they have forgotten that they are actually inside one.
[[AC:Tabletop Games]]
* In ''TabletopGame/{{Warhammer 40000}}'':
** Eldar craftworlds are described as "planetoid-sized".
** The Necron World Engine, unsurprisingly, is a Necron ship the size of a planet. An entire space marine chapter sacrificed itself to destroy it.
** Also, the [[http://wh40k.lexicanum.com/wiki/Phalanx Phalanx]] is the moon-sized fortress-monastery-spaceship of the Imperial Fists.
[[AC:Toys]]
* In ''Franchise/Bionicle'', Mata Nui was designed to observe other universes while having beings inside him functioning as NanoMachines in a sense. His HumongousMecha body is roughly forty million feet (7,575 mi or 12,192 km) tall and had a camouflage system that created an island on his face. Mata Nui was able to control specific things like gravity and light within his body.
[[AC:Video Games]]
* In ''VideoGame/{{Marathon}}'', the eponymous ship was originally Mars' moon Deimos.
* The ''Dammerung'' in ''VideoGame/{{Xenosaga}}'' is described in the accompanying Perfect Works manual as an artificial planet the size of Lebanon. It's the headquarters for {{Fiction 500}} company Vector, and contains at least one megalopolis in an area large enough to have a real weather system.
* In the videogame adaptation of ''WesternAnimation/{{Futurama}}'', Mom's plot involves transforming the Earth into a giant spaceship.
[[AC:Western Animation]]
* In ''WesternAnimation/InvaderZim'', Mars itself was converted into a spaceship.
----
Often used for RuleOfCool, in which case it will overlap with CoolStarship, the Planet Spaceship is a great way to intimidate your foe, or to pack your entire population off when your home world is in trouble. May evoke a "ThatsNoMoon" reaction when it first appears.
Subtrope of MileLongShip. May be used as a BigDumbObject, TheBattlestar, or a GenerationShip. Commonly, though not exclusively, found in SpaceOpera. Compare DysonSphere and RingWorldPlanet. See also: UnnecessarilyLargeVessel, UnnecessarilyLargeInterior and AwesomeButImpractical.
----
!! Examples:
[[AC:Anime & Manga]]
* The Zentradi main base in ''Anime/SuperDimensionFortressMacross'' is hundreds of kilometers across. Of course, the Zentradi themselves are giants.
* There's a ship in the Raalgon fleet, in ''Anime/IrresponsibleCaptainTylor'', that causes Tylor himself to comment that it's "more like a planet than a ship".
* In ''Anime/TengenToppaGurrenLagann'', the final battle has the two sides fighting with ships that are on the same scale as ''galaxies!''
* ''Anime/TransformersCybertron'': The planet Primus can transform into a spaceship of sorts.
* In ''Manga/{{Outlanders}}'', Earth's moon is revealed to be a millennia-old ship, the superweapon called "Dola".
[[AC:Comic Books]]
* Taa II, the Worldship belonging to the MarvelComics character {{Galactus}}, and named after his ravaged homeland Taa, is the size of ''a solar system''.
* The Homeworld of the Evrons in ''PaperinikNewAdventures'': they turn it into a [[CrazyAwesome spaceship]].
[[AC:Film - Animated]]
* Titan, for which ''WesternAnimation/TitanAE'' is named, is a very large, spherical spaceship. When activated, it converts energy into mass and [[spoiler:turns into an actual planet.]]
[[AC:Film - Live Action]]
* In ''Franchise/StarWars'', the ''Death Star'' is a moon-sized superweapon which is the original source of the ThatsNoMoon trope.
* Spaceball One in the movie ''Film/{{Spaceballs}}'', a parody of ''Franchise/StarWars'', has a similar scale.
[[AC:Literature]]
* In the Ted Reynolds short story, "Ker-Plop", we get a reminder of the difference between size and volume, when humans return from the Magellanic Clouds in a ship that is ten thousand kilometers across (about 1/10th the diameter of Ceres). The agent sent to investigate realizes that because the ''entire volume'' is inhabited, rather than just the surface, this one ship contains more people than his ''entire galactic federation''. The decks are arranged concentrically, like an onion, and the first kilometer ''alone'' has nearly ''400'' decks, each with nearly ''the same surface area'' as the entire ship!
* In Creator/EEDocSmith's ''Literature/SkylarkSeries'', Drs. Seaton and Crane build a 1000km diameter spaceship called the ''Skylark of Valeron''. Its size was needed to house the sensors required to travel at its full velocity. Later, their rival Dr. [=DuQuesne=] builds an even bigger ship.
* In Creator/LarryNiven's ''Literature/KnownSpace'' series, the Pierson's Puppeteers have basically turned a star with five orbiting planets into a spaceship, and are using it to flee the explosion at the center of the galaxy.
* In the ''Literature/{{Gor}}'' series:
** The planet Gor itself is arguably this, since the Priest-Kings (the PhysicalGods of the planet) moved it to its current location 5 million years ago.
** The Kurii live in "Steel Worlds" in the asteroid belt; from there they plot their plans to destroy the Priest-Kings and take over Gor & Earth for themselves. The Steel Worlds have aritifical weather & daytime/nighttime and rotate to simulate gravity, with beings living on the inside circumferance of the ships. They used to have a planet of their own but they destroyed it making war with each other.
* From Iain M. Banks's ''TheCulture'' novels, the General Systems Vehicles. You know that bit at the beginning of Star Wars, where the Star Destroyer swallows up the Tantive IV into its docking bay? Picture a ship that could do that... to the Death Star. Twice.
* Creator/DavidWeber's ''EmpireFromTheAshes'' series has ''Dahak'' and all the other Imperial Planetoids. ''Dahak'' has spent the last 50,000 years pretending to be Earth's Moon... and it's the smallest of them. They come equipped with hundred kilometer thick armor and carry 80,000 ton battleships as parasite craft.
* In Creator/JohnVarley's ''Literature/GaeaTrilogy'', Gaea and her brood are [[LivingShip living space habitats]] large enough to be mistaken for additional moons of Saturn.
* In ''The City and the Stars'' by Creator/ArthurCClarke, it is revealed at the end that [[spoiler: most of the humanity left the Galaxy to explore the universe... in a star cluster made into a fleet.]]
* At the end of ''Literature/HaloTheColeProtocol'', the inhabitants of The Rubble, survivors of the Covenant invasion of their system, convert a large asteroid into an evacuation ship to get everyone safely to UNSC space.
* In ''Literature/{{Remnants}}'', the humans who awaken when the ship reaches a destination initially think they've landed on a bizarre alien world. They soon discover it's a massive spaceship controlled by a sentient AI that brought them aboard as a curiosity.
* In Creator/RobertReed's ''Literature/GreatShip'' series, the Great Ship itself is an ancient abandoned artifact which was claimed and settled by mankind's descendents. It is larger than Jupiter.
[[AC:Live-Action TV]]
* In Series/{{Andromeda}} the Magog come from worlds (yes, that's plural) locked together in some kind of structure. The whole thing is mobile, and even contains an artificial sun!
* In the ''Series/StarTrekTheOriginalSeries'' ep. "The World is Hollow and I Have Touched the Sky" a group of aliens have been sequestered inside a large interstellar asteroid for so long that they have forgotten that they are actually inside one.
[[AC:Tabletop Games]]
* In ''TabletopGame/{{Warhammer 40000}}'':
** Eldar craftworlds are described as "planetoid-sized".
** The Necron World Engine, unsurprisingly, is a Necron ship the size of a planet. An entire space marine chapter sacrificed itself to destroy it.
** Also, the [[http://wh40k.lexicanum.com/wiki/Phalanx Phalanx]] is the moon-sized fortress-monastery-spaceship of the Imperial Fists.
[[AC:Toys]]
* In ''Franchise/Bionicle'', Mata Nui was designed to observe other universes while having beings inside him functioning as NanoMachines in a sense. His HumongousMecha body is roughly forty million feet (7,575 mi or 12,192 km) tall and had a camouflage system that created an island on his face. Mata Nui was able to control specific things like gravity and light within his body.
[[AC:Video Games]]
* In ''VideoGame/{{Marathon}}'', the eponymous ship was originally Mars' moon Deimos.
* The ''Dammerung'' in ''VideoGame/{{Xenosaga}}'' is described in the accompanying Perfect Works manual as an artificial planet the size of Lebanon. It's the headquarters for {{Fiction 500}} company Vector, and contains at least one megalopolis in an area large enough to have a real weather system.
* In the videogame adaptation of ''WesternAnimation/{{Futurama}}'', Mom's plot involves transforming the Earth into a giant spaceship.
[[AC:Western Animation]]
* In ''WesternAnimation/InvaderZim'', Mars itself was converted into a spaceship.
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