It is debatable whether any exist today. While there are a structures on earth that meet the megameter dimension requirement, such as, The Great Barrier Reef, at 2,000 km in length The Great Wall of China is a human-built megastructure, 6,700 km in length. neither of these examples satisfies the self-support requirement, making their status as megastructures open to debate. Networks of roads or railways, and collections of buildings (cities and associated suburbs), are usually not considered megastructures, despite frequently qualify ...

See also:

Megastructure, Megastructure - Existing megastructures, Megastructure - Theoretical megastructures, Megastructure - Stellar Scale, Megastructure - Planetary Scale, Megastructure - Orbital structures, Megastructure - Fictional megastructures, Megastructure - Stellar Scale, Megastructure - Planetary Scale, Megastructure - Orbital structures

Read more here: » Megastructure: Encyclopedia II - Megastructure - Existing megastructures

Halo video game series - Master Chief. Master Chief's true name is John, and his surname has never been revealed. His birth name was effectively erased, and so he is known by his rank of Master Chief or Spartan-117. This rank roughly corresponds to the modern rank Master Chief Petty Officer of the United States Navy in the 21st century. In the Halo universe, Master Chief and the entire SPARTAN project are under the command of the United Nations Space Command Navy. Master C ...

See also:

Halo video game series, Halo video game series - Video games, Halo video game series - Halo: Combat Evolved, Halo video game series - Halo 2, Halo video game series - Future Video Game Releases, Halo video game series - Halo 3, Halo video game series - Halo Gizmondo/mobile, Halo video game series - Possible influences, Halo video game series - Marathon, Halo video game series - Films, Halo video game series - Known Space, Halo video game series - Other Science Fiction, Halo video game series - Common culture, Halo video game series - Other, Halo video game series - Master Chief, Halo video game series - Novels, Halo video game series - Nonfiction Books, Halo video game series - Fan Fiction, Halo video game series - The Haunted Apiary, Halo video game series - Halo Machinima, Halo video game series - Time Magazine, Halo video game series - Dead or Alive 4, Halo video game series - Music

Read more here: » Halo video game series: Encyclopedia II - Halo video game series - Other

The term "Klemperer rosette" (often mis-spelled "Kemplerer rosette") is often used to mean a stable configuration of three or more equal masses, set at the points of an equilateral polygon and given an equal angular velocity about their center of mass. Klemperer does indeed mention this configuration at the start of his article, but only as an already known set of stable systems before introducing the actual rosettes. In Larry Niven's novel Ringworld, the Puppeteers' "Fleet of Worlds" is arranged in such a configu ...

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Klemperer rosette, Klemperer rosette - Misuse and misspelling, Klemperer rosette - Referances

Read more here: » Klemperer rosette: Encyclopedia II - Klemperer rosette - Misuse and misspelling

Human civilization is currently somewhere below Type I, as it is able to harness only a portion of the energy that is available on Earth. The current state of human civilization has thus been named Type 0. Although intermediate values were not discussed in Kardashev's original proposal, Carl Sagan argued that they could easily be defined by interpolating the values given above. He calculated humanity's current civilization to be 0.7. He used a powe ...

See also:

Kardashev scale, Kardashev scale - Usage and examples, Kardashev scale - Possible timeline, Kardashev scale - Function as a teleology, Kardashev scale - Weakness by supposition?, Kardashev scale - Counter-argument: abundance of alternative sources, Kardashev scale - Civilization implications, Kardashev scale - Contact constraints, Kardashev scale - Hypothetical extensions, Kardashev scale - Fictional extensions, Kardashev scale - Hypothetical futures, Kardashev scale - Type I, Kardashev scale - Type II, Kardashev scale - Type III, Kardashev scale - Type IV & V, Kardashev scale - Current values, Kardashev scale - Literature describing different Kardashev Types, Kardashev scale - Connections with sociology and anthropology, Kardashev scale - Notes

Read more here: » Kardashev scale: Encyclopedia II - Kardashev scale - Usage and examples

Authors have created thousands of fictional planets. Most of them are nearly indistinguishable from Earth, which is why Brian M. Stableford calls them "Earth-Clones". In these, differences with Earth life are mostly social (like Barrayar in the science fiction of Lois McMaster Bujold). More physically unusual planets have been depicted in hard science fiction books. For the Star Trek universe, a detailed planetary classification system has been devised.

See also:

Planets in science fiction, Planets in science fiction - Fictional planets, Planets in science fiction - Unusual social environment, Planets in science fiction - Unusual physical environment, Planets in science fiction - Living/sentient planets, Planets in science fiction - Other, Planets in science fiction - Books

Read more here: » Planets in science fiction: Encyclopedia II - Planets in science fiction - Fictional planets

Known Space - Races. In the process of exploring space, humankind encounters several intelligent alien species, including the following. The Kzinti, belligerent giant cat-like aliens with whom the humans fight several brutal wars – mostly offstage until the release of the Man-Kzin Wars short-story collections, largely by other authors. Pierson's Puppeteers, a technologically advanced race of three-legged, two-headed creatures descended from herd animals, and noted for their cowardic ...

See also:

Known Space, Known Space - Overview, Known Space - Races, Known Space - Locations, Known Space - Technology, Known Space - ARM, Known Space - Stories in Known Space, Known Space - Stories by Niven himself, Known Space - Man-Kzin Wars, Known Space - Playground

Read more here: » Known Space: Encyclopedia II - Known Space - Overview

List of space aliens in fiction - A. Abe (Abe's Oddysee) Abh (Crest of the Stars) Abyormenites (Hal Clement's Cycle of Fire (floating ballons - one race, that is)) Acquarans (Farscape) Aeodronians (Battlelords of the 23rd Century) Amnioni (Stephen Donaldson's The Gap Cycle) Anabis (The Voyage of the Space Beagle by A. E. van Vogt) Ancients (Farscape) Ancients (Stargate SG-1) < ...

See also:

List of space aliens in fiction, List of space aliens in fiction - List of named species, List of space aliens in fiction - A, List of space aliens in fiction - B, List of space aliens in fiction - C, List of space aliens in fiction - D, List of space aliens in fiction - E, List of space aliens in fiction - F, List of space aliens in fiction - G, List of space aliens in fiction - H, List of space aliens in fiction - I, List of space aliens in fiction - J, List of space aliens in fiction - K, List of space aliens in fiction - L, List of space aliens in fiction - M, List of space aliens in fiction - N, List of space aliens in fiction - O, List of space aliens in fiction - P, List of space aliens in fiction - Q, List of space aliens in fiction - R, List of space aliens in fiction - S, List of space aliens in fiction - T, List of space aliens in fiction - U, List of space aliens in fiction - V, List of space aliens in fiction - W, List of space aliens in fiction - X, List of space aliens in fiction - Y, List of space aliens in fiction - Z, List of space aliens in fiction - Works of fiction featuring unnamed alien races

Read more here: » List of space aliens in fiction: Encyclopedia II - List of space aliens in fiction - List of named species

List of fictional universes - Novels and short stories. Amber (Roger Zelazny) Chronicles of an Age of Darkness series by Hugh Cook The CoDominium (Jerry Pournelle) The Culture series of Iain M. Banks Dorsai series of Gordon R. Dickson Dune universe of Frank Herbert Eight Worlds of John Varley Ekumen (Ursula K. LeGuin's Hainian Cycle stories) Foundation series of Isaac Asimov Instrumentality of Mankind (Cordwainer Smith)< ...

See also:

List of fictional universes, List of fictional universes - Science fiction, List of fictional universes - Novels and short stories, List of fictional universes - Comic books, List of fictional universes - Television and movies, List of fictional universes - Websites, List of fictional universes - Fantasy, List of fictional universes - Pseudo-medieval fantasy worlds, List of fictional universes - Planetary Romance, List of fictional universes - Multidimensional fantasy worlds, List of fictional universes - Sword and sorcery and heroic fantasy worlds, List of fictional universes - Other, List of fictional universes - Imaginary universes in literature, List of fictional universes - Fictional universes in film and television, List of fictional universes - Fictional universes in comic books, List of fictional universes - Fictional universes in role-playing games, List of fictional universes - Fictional universes in video games

Read more here: » List of fictional universes: Encyclopedia II - List of fictional universes - Science fiction

List of fictional spaceships - Military & Exploration. Andromeda Ascendant - Gene Roddenberry's Andromeda DSS Alekssander - StarCraft: Brood War Balance of Judgment - Gene Roddenberry's Andromeda Battlestar Galactica - Battlestar Galactica (1978) & 2003 remake Brittania, Z9M9Z, Dauntless - E. E. Smith's Lensman series C-57D - Forbidden Planet ...

See also:

List of fictional spaceships, List of fictional spaceships - Small craft, List of fictional spaceships - Interplanetary, List of fictional spaceships - Interstellar, List of fictional spaceships - Military & Exploration, List of fictional spaceships - Transportation Freight or Colonization, List of fictional spaceships - Personal Spacecraft

Read more here: » List of fictional spaceships: Encyclopedia II - List of fictional spaceships - Interstellar

Danny Phantom and Vlad Plasmius are also characters in Nicktoons Unite! (PC, PlayStation 2, GameCube, Game Boy Advance, DS) The Fairly OddParents The Fairly OddParents: Breakin' Da Rules (PC, XBox, PlayStation 2, GameCube, Game Boy Advance) The Fairly OddParents: Clash with the Anti-World (PC, XBox, PlayStation 2, GameCube, Game Boy Advance) The Fairly OddParents: Enter the Cleft (Game Boy Advance) The Fairly OddParents: Shadow Showdown (PC, XBox, Play ...

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List of video games based on licensed properties, List of video games based on licensed properties - Action, List of video games based on licensed properties - Brand Names, List of video games based on licensed properties - Children's, List of video games based on licensed properties - Comedy, List of video games based on licensed properties - Fantasy, List of video games based on licensed properties - Game Show, List of video games based on licensed properties - Horror, List of video games based on licensed properties - Music Groups, List of video games based on licensed properties - Professional Wrestling Brands, List of video games based on licensed properties - Sci-Fi, List of video games based on licensed properties - Superheroes/Comics

Read more here: » List of video games based on licensed properties: Encyclopedia II - List of video games based on licensed properties - Children's

Kzinti evolved from a plains hunting cat, stole their current space-faring technology, and bred (most of) their own females into sub-sapience. They are larger than humans, standing around eight feet tall and weighing around five hundred pounds. These lion-sized bipeds have large membrane ears, a cylindrical torso without a spine, and large fangs and claws. A small percentage of Kzinti are stunted and exploited addictive telep ...

See also:

Kzin, Kzin - Background and history, Kzin - The Man-Kzin Wars, Kzin - Kzinti in other science fiction, Kzin - Kzinti in the Star Fleet Universe

Read more here: » Kzin: Encyclopedia II - Kzin - Background and history

The setting is a distant future based on extrapolation of as much hard science as Niven had available. Specifically, it's the 29th century. "Known space" (also the commonly used title for Larry Niven's future history science fiction series) is about 80 light years in diameter with 10,000 stars, including Human Space (40 light years diameter, 524 stars in 357 systems, 30 billion humans, 2/3 on Earth), as well as neighbouring Alien civilisations. Important Alien civilisations include the Puppeteers, paranoid pacifist herbivore centaurs, and th ...

See also:

Ringworld RPG, Ringworld RPG - Setting, Ringworld RPG - Game Play, Ringworld RPG - Game System, Ringworld RPG - Publications, Ringworld RPG - Ringworld Box Set, Ringworld RPG - Ringworld Companion

Read more here: » Ringworld RPG: Encyclopedia II - Ringworld RPG - Setting

The Internet boom in the 1990's made it possible for amateur authors with similar interests to write stories in the same shared universes. Since these authors mostly came from the role-playing game, furry, and fanfiction geek subcultures, the resulting shared universes tend toward those themes and genres most prevalent in those subcultures. While professional/corporate shared universes usually attempt to maintain overall continuity, the sheer number of amateur writers working in any given shared universe make for less stringent contin ...

See also:

Shared universe, Shared universe - Corporate examples, Shared universe - Professional examples, Shared universe - Posthumous retroactive shared worlds, Shared universe - Amateur examples, Shared universe - Shared-universe etiquette, Shared universe - Threaded time

Read more here: » Shared universe: Encyclopedia II - Shared universe - Amateur examples

Amusingly, every alien race in Startopia serves an in-game function, as well as a "theme". Startopia - Groulien Salt Hogs. Short but proud, Salt Hogs are considered the working class race of the game. They are the simplest to appease, needing basic facilities to be kept happy. Living on a planet created by a long-dead race, these aliens are mechanically inclined. As such, they are the only alien race able to produce and recycle materials in your station. Their speech is similar to that of a pig. ...

See also:

Startopia, Startopia - Overview, Startopia - Gameplay, Startopia - Decks, Startopia - Engineering Deck, Startopia - Entertainment deck, Startopia - Biodeck, Startopia - Alien Races, Startopia - Groulien Salt Hogs, Startopia - Grekka Targ, Startopia - Grey, Startopia - Dahanese Sirens, Startopia - Kasvagorians, Startopia - Karmaramans, Startopia - Turrakken, Startopia - Zedem Monks, Startopia - Polvakian Gem Slugs, Startopia - Sales and Sequels

Read more here: » Startopia: Encyclopedia II - Startopia - Alien Races

Most of the physical properties of superconductors vary from material to material, such as the heat capacity and the critical temperature at which superconductivity is destroyed. On the other hand, there is a class of properties that are independent of the underlying material. For instance, all superconductors have exactly zero resistivity to low applied currents when there is no magnetic field present. The existence of these "universal" properties imply that superconductivity is a thermodynamic phase, and thus possess certain d ...

See also:

Superconductivity, Superconductivity - Elementary properties of superconductors, Superconductivity - Zero electrical dc resistance, Superconductivity - Superconducting phase transition, Superconductivity - Meissner effect, Superconductivity - Theories of superconductivity, Superconductivity - History of superconductivity, Superconductivity - Technological applications of superconductivity, Superconductivity - Superconductors in science fiction

Read more here: » Superconductivity: Encyclopedia II - Superconductivity - Elementary properties of superconductors

Terry Pratchett was born in 1948 in Beaconsfield to David and Eileen Pratchett, of Hay-on-Wye. He credits his education to High Wycombe Technical High School and Beaconsfield Public Library. His first published work was the short story "The Hades Business", which appeared in his school magazine when he was 13, and was subsequently reprinted in Science Fantasy magazine in 1963, for which he was paid £14. His second published work was "Night Dweller", which appeared in New Wor ...

See also:

Terry Pratchett, Terry Pratchett - Biography, Terry Pratchett - Discworld, Terry Pratchett - Related works, Terry Pratchett - Adaptations, Terry Pratchett - Comic books, Terry Pratchett - Theatre, Terry Pratchett - Television, Terry Pratchett - Animation, Terry Pratchett - Radio, Terry Pratchett - Role-playing games, Terry Pratchett - PC and Console games, Terry Pratchett - Other non-Discworld books by Pratchett, Terry Pratchett - Other books containing contributions by Pratchett, Terry Pratchett - Works about Pratchett, Terry Pratchett - Fans, Terry Pratchett - Internet, Terry Pratchett - Influences, Terry Pratchett - Orangutans, Terry Pratchett - Trademarks

Read more here: » Terry Pratchett: Encyclopedia II - Terry Pratchett - Biography

There is quite a lot of science fiction and other geek-related subjects. Some of the most famous include topics such as the future of computer networking and artificial intelligence, such as Neuromancer by William Gibson, Snow Crash by Neal Stephenson, and books about futuristic topics like space exploration and expansion, such as the Foundation Series by Isaac Asimov, Ringworld by Larry Niven and the Dune series by Frank Herbert. A common theme throughout geek canon literature is the use of knowledge and intellig ...

See also:

Geek canon, Geek canon - Books, Geek canon - Art, Geek canon - Film, Geek canon - Television, Geek canon - Paper games, Geek canon - Computer games, Geek canon - First-person shooters, Geek canon - Gadgets

Read more here: » Geek canon: Encyclopedia II - Geek canon - Books

Terry Pratchett was born in 1948 in Beaconsfield to David and Eileen Pratchett, of Hay-on-Wye. He credits his education to High Wycombe Technical High School and Beaconsfield Public Library. His first published work was the short story "The Hades Business", which appeared in his school magazine when he was 13, and was subsequently reprinted in Science Fantasy magazine in 1963, for which he was paid £14. His second published work was "Night Dweller", which appeared in New Wor ...

See also:

Terry Pratchett, Terry Pratchett - Biography, Terry Pratchett - Discworld, Terry Pratchett - Related works, Terry Pratchett - Adaptations, Terry Pratchett - Comic books, Terry Pratchett - Theatre, Terry Pratchett - Television, Terry Pratchett - Animation, Terry Pratchett - Radio, Terry Pratchett - Role-playing games, Terry Pratchett - PC and Console games, Terry Pratchett - Other non-Discworld books by Pratchett, Terry Pratchett - Other books containing contributions by Pratchett, Terry Pratchett - Works about Pratchett, Terry Pratchett - Fans, Terry Pratchett - Internet, Terry Pratchett - Influences, Terry Pratchett - Orangutans, Terry Pratchett - Trademarks, Terry Pratchett - Notes

Read more here: » Terry Pratchett: Encyclopedia II - Terry Pratchett - Biography

Most of the physical properties of superconductors vary from material to material, such as the heat capacity and the critical temperature at which superconductivity is destroyed. On the other hand, there is a class of properties that are independent of the underlying material. For instance, all superconductors have exactly zero resistivity to low applied currents when there is no magnetic field present. The existence of these "universal" properties imply that superconductivity is a thermodynamic phase, and thus possess certain d ...

See also:

Superconductivity, Superconductivity - Elementary properties of superconductors, Superconductivity - Zero electrical resistance, Superconductivity - Superconducting phase transition, Superconductivity - Meissner effect, Superconductivity - Theories of superconductivity, Superconductivity - History of superconductivity, Superconductivity - Technological applications of superconductivity, Superconductivity - Superconductors in science fiction

Read more here: » Superconductivity: Encyclopedia II - Superconductivity - Elementary properties of superconductors

Roman Hispalis, in the province of Hispania Baetica, became ʾIšbīliyyah (Arabic أشبيليّة) under the Moors. Though Greeks and Romans repeated a founding myth connected with Heracles' visit to the Hesperides the historical site was occupied by the Tartessos in the 8th or 9th century BCE. Later it was a trading colony occupied by the Phoenicians and the Carthaginians, who destroyed the city in 216 BCE. In 206 BCE, Scipio Africanus founded Italica nearby, to settle his wounded veterans, and be ...

See also:

Seville, Seville - History, Seville - Seville the port, Seville - Modern Seville, Seville - Sights, Seville - Festivals, Seville - Sweets from Seville, Seville - Education, Seville - Trivia, Seville - Famous people born in Seville, Seville - Sports, Seville - Motto, Seville - Seville in fiction

Read more here: » Seville: Encyclopedia II - Seville - History

Halo video game series - Master Chief. Main article: Master Chief (Halo) Master Chief's true name is John, and his surname has never been revealed. His birth name was effectively erased, and so he is known by his rank of Master Chief or Spartan-117. This rank roughly corresponds to the modern rank Master Chief Petty Officer of the United States Navy in the 21st century. In the Halo universe, Master Chief and the entire SPARTAN project are under the command of the United Nations Space Command Navy. Master Chi ...

See also:

Halo video game series, Halo video game series - Video games, Halo video game series - Halo: Combat Evolved, Halo video game series - Halo 2, Halo video game series - Future Video Game Releases, Halo video game series - Halo 3, Halo video game series - Halo Gizmondo/mobile, Halo video game series - Possible influences, Halo video game series - Marathon, Halo video game series - Films, Halo video game series - Known Space, Halo video game series - Historical and Mythological Facts, Halo video game series - The Culture, Halo video game series - Other Science Fiction, Halo video game series - Common culture, Halo video game series - Other, Halo video game series - Master Chief, Halo video game series - Novels, Halo video game series - Nonfiction Books, Halo video game series - Fan Fiction, Halo video game series - The Haunted Apiary, Halo video game series - Halo Machinima, Halo video game series - Time Magazine, Halo video game series - Dead or Alive 4, Halo video game series - Music

Read more here: » Halo video game series: Encyclopedia II - Halo video game series - Other