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141-572: The Man-Kzin Wars is the name of a series of military science fiction anthologies as well as the name of the first book in the series. The short stories detail the eponymous conflicts between mankind and the Kzinti , set in Larry Niven 's Known Space universe. However, Niven himself has written only a small number of the stories; most were written by other science fiction writers, as Niven opened this part of

282-566: A Strategic Defense Initiative in which satellites would be set up to shoot at nuclear missiles. The two authors were Larry Niven , the author of the Ringworld series, and Jerry Pournelle . Along with like-minded colleagues, they formed a committee to lobby the United States on space issues and influence Reagan's space policies. Pournelle advocated a "robust, technocratic military state". In addition to Pournelle's science fiction writing, he wrote

423-533: A circumstellar disk , and then the planets grow out of that disk with the Sun. A nebula contains gas, ice grains, and dust (including primordial nuclides ). According to nebular theory , planetesimals formed by accretion , with the primordial Earth being estimated as likely taking anywhere from 70 to 100 million years to form. Estimates of the age of the Moon range from 4.5 Ga to significantly younger. A leading hypothesis

564-457: A "more disciplined and more realistic notion of the kind of armies which might fight interplanetary and interstellar wars, and the kinds of weapons they might use". In many stories, the usage or advancement of a specific technology plays a role in advancing the plot, such as deploying a new weapon or spaceship. Some works draw heavy parallels to human history and how a scientific breakthrough or new military doctrine can significantly change how war

705-551: A "paper for the Air Force on stability's role in national security". President Reagan read the space advice that Niven, Pournelle, and their colleagues prepared, which influenced Reagan's 1983 Strategic Defense Initiative . "Niven and Pournelle saw an opportunity to shape the great void in their political image, and Reagan viewed space as yet another tool to defend America against the communist superpower...". Science fiction authors such as Arthur C. Clarke and Isaac Asimov criticized

846-566: A Wunderland academic, in love with Dimity Carmody, married Leonie Rykermann, one of his students, during the occupation, believing Dimity to be dead. This situation has not been resolved. There was also a somewhat ambiguous growing relationship between Dimity and Vaemar-Riit; the two are depicted together on the cover of Man-Kzin Wars XI . The war ends in 2433 with the signing of the MacDonald-Rishaii Peace Treaty. The vast majority of

987-603: A captain, and are armed with semi-automatic rifles . Eventually, as science fiction became an established and separate genre, military science fiction established itself as a subgenre. One such work is H. Beam Piper 's Uller Uprising (1952) (based on the events of the Sepoy Mutiny ). Robert A. Heinlein's Starship Troopers (1959) is another work of military science fiction, along with Gordon Dickson 's Dorsai (1960), and these are thought to be mostly responsible for popularizing this subgenre's popularity among young readers of

1128-492: A common barycenter every 27.32 days relative to the background stars. When combined with the Earth–Moon system's common orbit around the Sun, the period of the synodic month , from new moon to new moon, is 29.53 days. Viewed from the celestial north pole , the motion of Earth, the Moon, and their axial rotations are all counterclockwise . Viewed from a vantage point above the Sun and Earth's north poles, Earth orbits in

1269-542: A counterclockwise direction about the Sun. The orbital and axial planes are not precisely aligned: Earth's axis is tilted some 23.44 degrees from the perpendicular to the Earth–Sun plane (the ecliptic ), and the Earth-Moon plane is tilted up to ±5.1 degrees against the Earth–Sun plane. Without this tilt, there would be an eclipse every two weeks, alternating between lunar eclipses and solar eclipses . The Hill sphere , or

1410-480: A form of faster-than-light travel in order to facilitate the enormous scale of interstellar war . The long spans of time (e.g., decades or centuries) required for human soldiers to travel interstellar distances, even at relativistic speeds, and the consequences for the characters, is a dilemma examined by authors such as Joe Haldeman and Alastair Reynolds . Other writers such as Larry Niven have created plausible interplanetary conflict based on human colonization of

1551-420: A full rotation about its axis so that the Sun returns to the meridian . The orbital speed of Earth averages about 29.78 km/s (107,200 km/h; 66,600 mph), which is fast enough to travel a distance equal to Earth's diameter, about 12,742 km (7,918 mi), in seven minutes, and the distance from Earth to the Moon, 384,400 km (238,900 mi), in about 3.5 hours. The Moon and Earth orbit

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1692-519: A future mercenary tank regiment . Drake's series which "helped initiate a fashion for sf about mercenaries", including The Warrior's Apprentice (1986) by Lois McMaster Bujold . A twist was introduced in Harry Turtledove 's Worldwar series depicting an alternate history in which WWII is disrupted by extraterrestrials invading Earth in 1942, forcing humans to stop fighting each other and unite against this common enemy. Turtledove depicts

1833-453: A galactic empire is sometimes a "core world," such as a planet relatively near a galaxy's centrally-located supermassive black hole, which has advanced considerably in science and technology compared to current human civilization. Characterizations of these empires can vary wildly from malevolent forces that attack sympathetic victims, to apathetic or amoral bureaucracies, to more reasonable entities focused on social progress. A writer may posit

1974-421: A globe-spanning mid-ocean ridge system. At Earth's polar regions , the ocean surface is covered by seasonally variable amounts of sea ice that often connects with polar land, permafrost and ice sheets , forming polar ice caps . Earth's land covers 29.2%, or 149 million km (58 million sq mi) of Earth's surface. The land surface includes many islands around the globe, but most of

2115-520: A human university and obtained a reserve officer's commission. These became known as the Wunderkzin, and some later proved to be human allies. This slowly growing Man-Kzin cooperation was bitterly opposed both by many other Kzin and by many revanchist humans on Wunderland, while others among the human and kzin communities on Wunderland sought to manipulate the situation for their own ends. There were also ongoing human situations – for example, Nils Rykermann,

2256-453: A law enforcement setting. Some examples include Richard Morgan 's Takashi Kovacs book such as Altered Carbon (2002) and Elizabeth Bear 's Jenny Casey books, such as Hammered (2004). Precursors for military science fiction can be found in "future war" stories dating back at least to George Chesney 's story " The Battle of Dorking " (1871). Written just after the Prussian victory in

2397-425: A liquid outer core that generates a magnetosphere capable of deflecting most of the destructive solar winds and cosmic radiation . Earth has a dynamic atmosphere , which sustains Earth's surface conditions and protects it from most meteoroids and UV-light at entry . It has a composition of primarily nitrogen and oxygen . Water vapor is widely present in the atmosphere, forming clouds that cover most of

2538-530: A military science fiction story can speculate about war in the future, in space, or involving space travel, or the effects of such a war on humans; at the other, a story with a fictional military plot may have relatively superficial science fictional elements. The term "military space opera" may occasionally denote this latter style, as used for example by critic Sylvia Kelso when describing Lois McMaster Bujold 's Vorkosigan Saga . Examples that feature aspects of both military science fiction and space opera include

2679-528: A number of his later stories referenced the Man-Kzin Wars, he never actually showed them. However, there was a large fan demand for stories covering the conflict, and a number of his author friends had shown interest in writing tales set in the time frame. Niven, therefore, allowed the Man-Kzin Wars to become a shared universe , starting with the 1988 release of The Man-Kzin Wars . Starting with volume three, Niven himself has composed several additional stories in

2820-550: A number of other colonies in space, the most important being the Asteroid Belt, Wunderland, We Made It, Jinx, and Plateau. The Kzinti, with vast technical superiority (including gravity drives, telepaths , and a large military empire), detected a human colonization ship in deep space, the Angel's Pencil . After the Kzin telepath learned that the humans were unarmed and did not even understand

2961-497: A semi-covert training center on Barnard's Starbase. There the troika develops plans for fighting the hyperdrive-equipped Kzinti in a coming second war. The new plans are needed since the (mostly successful) human tactics in the first were restricted by their own ignorance, and by the ARM's structure: the only successful other planetary assaults the liberation of Wunderland, only two, on Down and Hssin. The group devises two ways to help prepare

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3102-460: A space colony requiring defense against attack out on the frontier. Gene Roddenberry described Star Trek: The Original Series as a Space Western (or more poetically, as " Wagon Train to the stars"). The TV series Firefly and its cinematic follow-up Serenity literalized the Western aspects of the space Western subgenre as popularized by Star Trek : it features frontier towns, horses, and

3243-448: A subject were collected and marketed as such. The series of anthologies with the group title There Will be War edited by Pournelle and John F. Carr (nine volumes from 1983 through 1990) helped keep the category active, and encouraged new writers to add to it. David Drake wrote stories about future mercenaries, including the Hammer's Slammers series (1979), which follows the career of

3384-471: A time, between the discoveries of atomic power and the gravity polarizer, when it seemed the Kzinti species would destroy itself in wars. Now the Kzinti held many worlds, and the danger was past. However, "Jotok" suggests a possible compromise scenario. In that story, primitive Kzinti clans on the Kzin homeworld are being marginalized by advanced Kzinti who use atomic power and gravity polarizer-driven spacecraft. It

3525-461: A visual style evocative of classic John Ford Westerns. Worlds that have been terraformed may be depicted as presenting similar challenges as that of a frontier settlement in a classic Western. Six-shooters and horses may be replaced by ray guns and rockets. A "thematic subdivision" of MSF are works where "ex-military protagonists [are] drawing on their battle experience for tough and violent operations in (more or less) civilian life", typically in

3666-508: Is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System . Of the four rocky planets , it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it , taking a year (about 365.25 days) to complete one revolution. Earth rotates around its own axis in slightly less than a day (in about 23 hours and 56 minutes). Earth's axis of rotation

3807-456: Is a chemically distinct silicate solid crust, which is underlain by a highly viscous solid mantle. The crust is separated from the mantle by the Mohorovičić discontinuity . The thickness of the crust varies from about 6 kilometres (3.7 mi) under the oceans to 30–50 km (19–31 mi) for the continents. The crust and the cold, rigid, top of the upper mantle are collectively known as

3948-531: Is approximately 9.8 m/s (32 ft/s ). Local differences in topography, geology, and deeper tectonic structure cause local and broad regional differences in Earth's gravitational field, known as gravity anomalies . The main part of Earth's magnetic field is generated in the core, the site of a dynamo process that converts the kinetic energy of thermally and compositionally driven convection into electrical and magnetic field energy. The field extends outwards from

4089-517: Is contained in 3.45 billion-year-old Australian rocks showing fossils of microorganisms . During the Neoproterozoic , 1000 to 539 Ma , much of Earth might have been covered in ice. This hypothesis has been termed " Snowball Earth ", and it is of particular interest because it preceded the Cambrian explosion , when multicellular life forms significantly increased in complexity. Following

4230-503: Is fairly static, and weapons that would be familiar to present-day soldiers are used, but other aspects of society have changed. Technology may not be emphasized in such stories as much as other aspects of the characters' military lives, cultures, or societies. For example, women may be accepted as equal partners for combat roles, or preferred over men. When the "extravagan[t]" depictions of war in space operas faded along with pulp fiction more generally, military science fiction developed with

4371-452: Is farthest out from its center of mass at its equatorial bulge, the summit of the volcano Chimborazo in Ecuador (6,384.4 km or 3,967.1 mi) is its farthest point out. Parallel to the rigid land topography the ocean exhibits a more dynamic topography . To measure the local variation of Earth's topography, geodesy employs an idealized Earth producing a geoid shape. Such a shape

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4512-427: Is fought, the outcome of a battle, and the fortunes of the combatants. Many works explore how human progress, discovery, and suffering affect military doctrine or battle, and how the protagonists and antagonists reflect on and adapt to such changes. Many authors have either used a galaxy-spanning fictional empire as a background for the story, or have explored the growth and/or decline of such an empire. The capital of

4653-516: Is gained if the ocean is idealized, covering Earth completely and without any perturbations such as tides and winds. The result is a smooth but irregular geoid surface, providing a mean sea level (MSL) as a reference level for topographic measurements. Earth's surface is the boundary between the atmosphere, and the solid Earth and oceans. Defined in this way, it has an area of about 510 million km (197 million sq mi). Earth can be divided into two hemispheres : by latitude into

4794-426: Is liquid under normal atmospheric pressure. Differences in the amount of captured energy between geographic regions (as with the equatorial region receiving more sunlight than the polar regions) drive atmospheric and ocean currents , producing a global climate system with different climate regions , and a range of weather phenomena such as precipitation , allowing components such as nitrogen to cycle . Earth

4935-584: Is mentioned in the Ringworld RPG and The Ringworld Engineers . According to the Known Space novel Juggler of Worlds , it started in 2490. Towards the start of the war, the Wunderland Treatymaker weapon is used on the Kzinti fortress-world of Warhead, creating a huge, habitable canyon on the otherwise Mars -like world. Warhead is annexed by the humans and renamed Canyon, where Louis Wu lives as of

5076-489: Is not necessarily set in outer space or on multiple worlds, as in space opera and the space Western . Both military science fiction and the space Western may consider an interstellar war and oppression by a galactic empire as the story's backdrop. They may focus on a lone gunslinger , soldier, or veteran in a futuristic space frontier setting . Western elements and conventions in military science fiction may be explicit, such as cowboys in outer space, or more subtle, as in

5217-501: Is now slightly longer than it was during the 19th century due to tidal deceleration , each day varies between 0 and 2 ms longer than the mean solar day. Earth's rotation period relative to the fixed stars , called its stellar day by the International Earth Rotation and Reference Systems Service (IERS), is 86,164.0989 seconds of mean solar time ( UT1 ), or 23 56 4.0989 . Earth's rotation period relative to

5358-612: Is rare, though the alternative spelling Gaia has become common due to the Gaia hypothesis , in which case its pronunciation is / ˈ ɡ aɪ . ə / rather than the more classical English / ˈ ɡ eɪ . ə / . There are a number of adjectives for the planet Earth. The word "earthly" is derived from "Earth". From the Latin Terra comes terran / ˈ t ɛr ə n / , terrestrial / t ə ˈ r ɛ s t r i ə l / , and (via French) terrene / t ə ˈ r iː n / , and from

5499-561: Is science fiction which is written about a military situation with a fundamental understanding of how military lifestyles and characters differ from civilian lifestyles and characters. It is science fiction which attempts to realistically portray the military within a science-fiction context. It is not 'bug shoots'. It is about human beings, and members of other species, caught up in warfare and carnage. It isn't an excuse for simplistic solutions to problems. In 1980 and 1981, two science fiction authors inspired President Ronald Reagan 's vision for

5640-477: Is that it was formed by accretion from material loosed from Earth after a Mars -sized object with about 10% of Earth's mass, named Theia , collided with Earth. It hit Earth with a glancing blow and some of its mass merged with Earth. Between approximately 4.1 and 3.8 Ga , numerous asteroid impacts during the Late Heavy Bombardment caused significant changes to the greater surface environment of

5781-453: Is the basis for the astronomical unit (AU) and is equal to roughly 8.3 light minutes or 380 times Earth's distance to the Moon . Earth orbits the Sun every 365.2564 mean solar days , or one sidereal year . With an apparent movement of the Sun in Earth's sky at a rate of about 1°/day eastward, which is one apparent Sun or Moon diameter every 12 hours. Due to this motion, on average it takes 24 hours—a solar day—for Earth to complete

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5922-781: Is the primitives who are hired by the Jotoki, to use as mercenaries against the more advanced Kzinti. Military science fiction A detailed description of the conflict, belligerents (which may involve extraterrestrials), tactics and weapons used for it, and the role of a military service and the individual members of that military organization form the basis for a typical work of military science fiction. The stories often use features of actual past or current Earth conflicts, with countries being replaced by planets or galaxies with similar characteristics, battleships replaced by space battleships, small arms and artillery replaced by lasers, soldiers replaced by space marines, and certain events changed so

6063-457: Is tied to that of the Sun. Over the next 1.1 billion years , solar luminosity will increase by 10%, and over the next 3.5 billion years by 40%. Earth's increasing surface temperature will accelerate the inorganic carbon cycle , possibly reducing CO 2 concentration to levels lethally low for current plants ( 10  ppm for C4 photosynthesis ) in approximately 100–900 million years . A lack of vegetation would result in

6204-451: Is tilted with respect to the perpendicular to its orbital plane around the Sun, producing seasons . Earth is orbited by one permanent natural satellite , the Moon , which orbits Earth at 384,400 km (1.28 light seconds) and is roughly a quarter as wide as Earth. The Moon's gravity helps stabilize Earth's axis, causes tides and gradually slows Earth's rotation . Tidal locking has made

6345-637: The Battlestar Galactica franchise and Robert A. Heinlein 's 1959 novel Starship Troopers . A key distinction of military science fiction from space opera is that space operas focus more on adventurous stories and melodrama, while military science fiction focuses more on warfare and technical aspects. The principal characters in a space opera are also not military personnel, but civilians or paramilitary . Stories in both subgenres often concern an interstellar war in which humans fight themselves and/or nonhuman entities. Military science fiction, however,

6486-539: The Franco-Prussian War , it describes an invasion of Britain by a German-speaking country in which the Royal Navy is destroyed by a futuristic wonder-weapon ("fatal engines"). Other works of military science fiction followed, including H.G. Wells 's " The Land Ironclads ". It described tank-like "land ironclads ," 80-to-100-foot-long (24 to 30 m) armoured fighting vehicles that carry riflemen, engineers, and

6627-411: The Known Space to collaboration in the form of a shared universe . The cover art for the books in the series is created by Stephen Hickman . The first story set in the Man-Kzin Wars, "The Warriors" (1966), was one of Niven's earliest published stories and one of the first of what would become his Known Space series. Niven did not consider himself qualified to write war stories; therefore, although

6768-626: The Man-Kzin Wars stories are set around the First War. Following the end of hostilities, the Human forces use their hyperdrive ships to initiate a blockade of all Kzinti worlds within range of Human space. The Kzinti of both their homeworld and the prominent colony of W'kkai begin researching hyperdrive technology in an attempt to break the blockade, with the High Admiral of W'kkai also hoping to overthrow

6909-566: The Milky Way and orbits about 28,000  light-years from its center. It is about 20 light-years above the galactic plane in the Orion Arm . The axial tilt of Earth is approximately 23.439281° with the axis of its orbit plane, always pointing towards the Celestial Poles . Due to Earth's axial tilt, the amount of sunlight reaching any given point on the surface varies over the course of

7050-491: The Outsiders would equip mankind with hyperdrives, knowing that it would be the tool that would allow victory for humans. The series has been described as one of the better-known works related to the theme of armed conflict in science fiction . Larry Niven has never specifically addressed whether or not these stories are part of the canon of Known Space stories. He has ruled "A Darker Geometry" as definitely non-canonical, and

7191-722: The Pacific , North American , Eurasian , African , Antarctic , Indo-Australian , and South American . Other notable plates include the Arabian Plate , the Caribbean Plate , the Nazca Plate off the west coast of South America and the Scotia Plate in the southern Atlantic Ocean. The Australian Plate fused with the Indian Plate between 50 and 55 Ma . The fastest-moving plates are

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7332-653: The asteroid belt and outer planets by means of technologies utilizing the laws of physics as currently understood. Several subsets of military science fiction share characteristics of the space opera subgenre, concentrating on large-scale space battles with futuristic weapons in an interstellar war . Many stories can be considered to be in one or both the military science fiction and space opera subgenres, such as The Sten Chronicles by Allan Cole and Chris Bunch , Ender's Game series by Orson Scott Card , Honorverse by David Weber , Deathstalker by Simon R. Green , and Armor by John Steakley. At one extreme,

7473-419: The asthenosphere , the solid but less-viscous part of the upper mantle that can flow and move along with the plates. As the tectonic plates migrate, oceanic crust is subducted under the leading edges of the plates at convergent boundaries. At the same time, the upwelling of mantle material at divergent boundaries creates mid-ocean ridges. The combination of these processes recycles the oceanic crust back into

7614-415: The celestial equator , this is equivalent to an apparent diameter of the Sun or the Moon every two minutes; from Earth's surface, the apparent sizes of the Sun and the Moon are approximately the same. Earth orbits the Sun, making Earth the third-closest planet to the Sun and part of the inner Solar System . Earth's average orbital distance is about 150 million km (93 million mi), which

7755-408: The ocean floor form the top of Earth's crust , which together with parts of the upper mantle form Earth's lithosphere . Earth's crust may be divided into oceanic and continental crust. Beneath the ocean-floor sediments, the oceanic crust is predominantly basaltic , while the continental crust may include lower density materials such as granite , sediments and metamorphic rocks. Nearly 75% of

7896-430: The precessing or moving mean March equinox (when the Sun is at 90° on the equator), is 86,164.0905 seconds of mean solar time (UT1) (23 56 4.0905 ) . Thus the sidereal day is shorter than the stellar day by about 8.4 ms. Apart from meteors within the atmosphere and low-orbiting satellites, the main apparent motion of celestial bodies in Earth's sky is to the west at a rate of 15°/h = 15'/min. For bodies near

8037-413: The sphere of gravitational influence , of Earth is about 1.5 million km (930,000 mi) in radius. This is the maximum distance at which Earth's gravitational influence is stronger than that of the more distant Sun and planets. Objects must orbit Earth within this radius, or they can become unbound by the gravitational perturbation of the Sun. Earth, along with the Solar System, is situated in

8178-464: The "last ice age", covered large parts of the continents, to the middle latitudes, in ice and ended about 11,700 years ago. Chemical reactions led to the first self-replicating molecules about four billion years ago. A half billion years later, the last common ancestor of all current life arose. The evolution of photosynthesis allowed the Sun's energy to be harvested directly by life forms. The resultant molecular oxygen ( O 2 ) accumulated in

8319-479: The Cambrian explosion, 535 Ma , there have been at least five major mass extinctions and many minor ones. Apart from the proposed current Holocene extinction event, the most recent was 66 Ma , when an asteroid impact triggered the extinction of non-avian dinosaurs and other large reptiles, but largely spared small animals such as insects, mammals , lizards and birds. Mammalian life has diversified over

8460-637: The Earth. Terra is also the name of the planet in some Romance languages , languages that evolved from Latin , like Italian and Portuguese , while in other Romance languages the word gave rise to names with slightly altered spellings, like the Spanish Tierra and the French Terre . The Latinate form Gæa or Gaea ( English: / ˈ dʒ iː . ə / ) of the Greek poetic name Gaia ( Γαῖα ; Ancient Greek : [ɡâi̯.a] or [ɡâj.ja] )

8601-495: The Fifth Invasion fleet. The attack hit the Kzin amidst internal struggles following the death of their leader. Due to the huge success, Wunderland was quickly liberated, freeing the fleet to attack other Kzinti worlds. The FTL drive allowed the human fleets to coordinate and concentrate their forces beyond anything the Kzinti could manage, even letting them outrun and jam the news of each successive Kzin defeat. The first indication

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8742-571: The Human military forces attempt to reverse-engineer Kzinti gravity technology. They also attempt to locate and form an anti-Kzin alliance with the Pierin aliens (although according to the Ringworld RPG , the Pierin may already be enslaved at this point). A troika of unconventional officers – Belter General Lucas Fry, flatlander Major Yankee Clandeboye, and Wunderlander Admiral Blumenhandler – establish

8883-478: The Kzin far more than anyone had previously thought. In other cases, stories clearly contradict established canon. For example, various MKW stories state that Kzinti did not establish their own interstellar empire nor invent their own spacefaring technology. Instead, primitive Kzinti warriors were hired as mercenaries by the Jotoki, a species of interstellar traders, whom the Kzinti later overthrew and enslaved. Yet, Niven's " The Soft Weapon " states: There had been

9024-591: The Kzinti Patriarchy had that much of the Kzin empire was gone and that a significant percentage of all Kzinti had died was when human warships appeared in the skies above their homeworld. Meanwhile, however, on Wunderland, now liberated by humans, several surviving Kzin, led by Vaemar-Riit, the last surviving kitten of Chuut-Riit, and with the cooperation of Dimity Carmody, Nils Rykermann, Leonie Rykermann, and other humans began to cautiously cooperate with humans and try to learn human ways. Vaemar-Riit even enrolled at

9165-490: The Kzinti's superior numbers, firepower, and technology, were it only wielded with a modicum of tactical and strategic sense. In order to delay the next attack, a Terran Bussard ramjet starship was utilized to transport and deploy several relativistic kill vehicles in the Wunderland system. Using iron slugs accelerated to 99% of the speed of light, it devastated a portion of the planet, killing humans and Kzinti alike and delaying

9306-581: The Latin Tellus comes tellurian / t ɛ ˈ l ʊər i ə n / and telluric . The oldest material found in the Solar System is dated to 4.5682 +0.0002 −0.0004 Ga (billion years) ago. By 4.54 ± 0.04 Ga the primordial Earth had formed. The bodies in the Solar System formed and evolved with the Sun. In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into

9447-463: The Man-Kzin Wars were engineered by the Puppeteers. The Puppeteers viewed the Kzin as too dangerous and hoped a series of wars in which successive generations of the most aggressive Kzinti males were selectively killed off by humans would help breed reason into the Kzinti as the preferred alternative over outright extermination. To that end, the Puppeteers used a starseed lure on Procyon to ensure that

9588-745: The Moon always face Earth with the same side. Earth, like most other bodies in the Solar System, formed 4.5 billion years ago from gas and dust in the early Solar System . During the first billion years of Earth's history , the ocean formed and then life developed within it. Life spread globally and has been altering Earth's atmosphere and surface, leading to the Great Oxidation Event two billion years ago. Humans emerged 300,000 years ago in Africa and have spread across every continent on Earth. Humans depend on Earth's biosphere and natural resources for their survival, but have increasingly impacted

9729-426: The Moon and, by inference, to that of Earth. Earth's atmosphere and oceans were formed by volcanic activity and outgassing . Water vapor from these sources condensed into the oceans, augmented by water and ice from asteroids, protoplanets , and comets . Sufficient water to fill the oceans may have been on Earth since it formed. In this model, atmospheric greenhouse gases kept the oceans from freezing when

9870-667: The Patriarch. Due to the treachery of Ulf Reichstein Markham, the Kzinti of Kzin gain access to hyperdrive designs and an engineer familiar with them in 2438. During this time, the Kdaptist religion spreads among the Kzinti. On Wunderland, an attempt is made to form a stable, democratic government. On Earth, although no one seriously believes the Kzin will stay away, the ARM returns to its old habits of trying to eliminate all knowledge and technology of war. We Made It continues to create hyperdrives, as

10011-546: The RPG. The Bible included corrections for some of the inconsistencies in Niven's work. Jerry Pournelle and Poul Anderson were among the first authors approached, and both ended up writing stories. The series has continued to the current day (volume XV was released in 2019). † Additional notes: There are a total of four Man-Kzin Wars, as well as major and minor "Kzinti incidents". The First War began circa 2367. By this time, Human space

10152-458: The Solar System's planetary-sized objects, Earth is the object with the highest density . Earth's mass is approximately 5.97 × 10   kg ( 5.970  Yg ). It is composed mostly of iron (32.1% by mass ), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminium (1.4%), with the remaining 1.2% consisting of trace amounts of other elements. Due to gravitational separation ,

10293-521: The Strategic Defense Initiative. After the 9/11 terrorism attacks, a group of sci-fi authors called Sigma, including Pournelle and Niven, advised the "Department of Homeland Security on technological strategies for defeating terrorist threats." In 2021, Worldcrunch reported that the French military has hired fiction writers to develop futuristic warfare scenarios, including situations that

10434-403: The Sun when the star reaches its maximum radius, otherwise, with tidal effects, it may enter the Sun's atmosphere and be vaporized. Earth has a rounded shape , through hydrostatic equilibrium , with an average diameter of 12,742 kilometres (7,918 mi), making it the fifth largest planetary sized and largest terrestrial object of the Solar System . Due to Earth's rotation it has

10575-559: The Vietnam War's influence can be seen indirectly in novels such as Joe Haldeman 's The Forever War (published in Analog over 1972–1975) and Lucius Shepard 's Life During Wartime (1987). The Vietnam War resulted in veterans with combat experience deciding to write science fiction, including Joe Haldeman and David Drake . Throughout the 1970s, works such as Haldeman's The Forever War and Drake's Hammer's Slammers helped increase

10716-425: The atmosphere and due to interaction with ultraviolet solar radiation, formed a protective ozone layer ( O 3 ) in the upper atmosphere. The incorporation of smaller cells within larger ones resulted in the development of complex cells called eukaryotes . True multicellular organisms formed as cells within colonies became increasingly specialized. Aided by the absorption of harmful ultraviolet radiation by

10857-438: The author can extrapolate what might have occurred. Traditional military values of courage under fire, sense of duty, honor, sacrifice, loyalty, and camaraderie are often emphasized. The action is typically described from the point of view of a soldier in a science fictional setting of or near battle . Typically, the technology is more advanced than that of the present and described in detail. In some stories, however, technology

10998-485: The belief that the Kzin will attack again. All information on the second war comes from the Ringworld RPG guidebook. It begins in 2449 when the Kzinti launch "diversionary raids" on Sigma Draconis and Barnard's Star (which can probably be retconned to be due to Barnard's Starbase from The Heroic Myth of Lieutenant Nora Argamentine ) and ends in 2475 with the liberation of the Kdatlyno from Kzin rule. The Third War

11139-500: The canon (in particular, those written by Niven long before the Man-Kzin Wars series was published). The protagonist in Matthew Joseph Harrington's "Teacher's Pet" from Man-Kzin Wars XI , who has become a Protector after landing on Home while fleeing from Kzinti, deduces several things that (at least at first glance) seem to be at odds with accepted canon – for example, that Puppeteers had been manipulating both humanity and

11280-450: The center, the temperature may be up to 6,000 °C (10,830 °F), and the pressure could reach 360  GPa (52 million  psi ). Because much of the heat is provided by radioactive decay, scientists postulate that early in Earth's history, before isotopes with short half-lives were depleted, Earth's heat production was much higher. At approximately 3  Gyr , twice the present-day heat would have been produced, increasing

11421-408: The colony of We Made It the manual for a hyperdrive, a technology unknown to the Kzinti. Dimity Carmody, an escapee from Wunderland and a genius who had toyed with FTL drive concepts before the occupation, managed to construct a working prototype drive using the manual. Hyperdrive ships were dispatched to Earth, where the faster-than-light drive was installed on several ships for a preemptive attack on

11562-471: The concept of weapons, they attempted to kill the human crew in a slow, painful manner using an inductive heating weapon hoping to capture their ship intact for intelligence purposes. However, one of the humans used the ship's powerful drive system (which doubled as an interstellar communications laser) as a weapon and destroyed the Kzin ship, beginning the First Man-Kzin War. The crew then warned Earth of

11703-454: The continental crust , particularly during the early stages of Earth's history. New continental crust forms as a result of plate tectonics , a process ultimately driven by the continuous loss of heat from Earth's interior. Over the period of hundreds of millions of years, tectonic forces have caused areas of continental crust to group together to form supercontinents that have subsequently broken apart. At approximately 750 Ma , one of

11844-616: The continental surfaces are covered by sedimentary rocks, although they form about 5% of the mass of the crust. Earth's surface topography comprises both the topography of the ocean surface , and the shape of Earth's land surface. The submarine terrain of the ocean floor has an average bathymetric depth of 4 km, and is as varied as the terrain above sea level. Earth's surface is continually being shaped by internal plate tectonic processes including earthquakes and volcanism ; by weathering and erosion driven by ice, water, wind and temperature; and by biological processes including

11985-419: The core are chaotic; the magnetic poles drift and periodically change alignment. This causes secular variation of the main field and field reversals at irregular intervals averaging a few times every million years. The most recent reversal occurred approximately 700,000 years ago. The extent of Earth's magnetic field in space defines the magnetosphere . Ions and electrons of the solar wind are deflected by

12126-527: The core is primarily composed of the denser elements: iron (88.8%), with smaller amounts of nickel (5.8%), sulfur (4.5%), and less than 1% trace elements. The most common rock constituents of the crust are oxides . Over 99% of the crust is composed of various oxides of eleven elements, principally oxides containing silicon (the silicate minerals ), aluminium, iron, calcium, magnesium, potassium, or sodium. The major heat-producing isotopes within Earth are potassium-40 , uranium-238 , and thorium-232 . At

12267-463: The core, through the mantle, and up to Earth's surface, where it is, approximately, a dipole . The poles of the dipole are located close to Earth's geographic poles. At the equator of the magnetic field, the magnetic-field strength at the surface is 3.05 × 10 T , with a magnetic dipole moment of 7.79 × 10 Am at epoch 2000, decreasing nearly 6% per century (although it still remains stronger than its long time average). The convection movements in

12408-540: The course of the First Man-Kzin War, the Kzinti invaded and occupied the human colony of Wunderland, in the Alpha Centauri system, as a staging point for an attack on Earth. Human ships attempting to escape back to Earth were shot down, but a single vessel managed to carry some refugees to the sister colony We Made It. The Kzinti fleet moved on to Earth, but in a replay of first contact, the peaceful humans used communications lasers , fusion drives, and mass drivers to cut

12549-524: The days shorter. Above the Arctic Circle and below the Antarctic Circle there is no daylight at all for part of the year, causing a polar night , and this night extends for several months at the poles themselves. These same latitudes also experience a midnight sun , where the sun remains visible all day. By astronomical convention, the four seasons can be determined by the solstices—the points in

12690-425: The death of 2 ⁄ 3 of all Kzin then alive, and the confiscation of two Kzinti worlds. The surviving Kzinti finally face the reality that another all-out war would bring no benefit. At the time of Ringworld , Kzinti numbers are still less than 1 ⁄ 8 of what they were when they first encountered humans. In the events of Ringworld , Nessus inadvertently reveals to Wu and Speaker-to-Animals that

12831-605: The earliest known supercontinents, Rodinia , began to break apart. The continents later recombined to form Pannotia at 600–540 Ma , then finally Pangaea , which also began to break apart at 180 Ma . The most recent pattern of ice ages began about 40 Ma , and then intensified during the Pleistocene about 3 Ma . High- and middle-latitude regions have since undergone repeated cycles of glaciation and thaw, repeating about every 21,000, 41,000 and 100,000 years. The Last Glacial Period , colloquially called

12972-544: The equally large area of land under permafrost ) or deserts (33%). The pedosphere is the outermost layer of Earth's land surface and is composed of soil and subject to soil formation processes. Soil is crucial for land to be arable. Earth's total arable land is 10.7% of the land surface, with 1.3% being permanent cropland. Earth has an estimated 16.7 million km (6.4 million sq mi) of cropland and 33.5 million km (12.9 million sq mi) of pastureland. The land surface and

13113-411: The first invasion fleet to ribbons. Over the next several decades, three more fleets were launched against Earth , and all were beaten back. However, after near defeat by the fourth fleet, it was becoming clear to Earth's military leaders that the Kzinti were learning to wage war more effectively than their traditional "scream and leap" tactics, and that the Solar System's defenses would quickly succumb to

13254-670: The gap is not too wide for the humans to bridge. For example, the invaders have more advanced tanks, but the German Wehrmacht's tank crews facing them – a major theme in the series – are more skilled and far more experienced. The Encyclopedia of Science Fiction lists three notable women authors of MSF: Lois McMaster Bujold ; Elizabeth Moon (particularly her Familias Regnant stories such as Hunting Party (1993)), and Karen Traviss . Several authors have presented stories with political messages of varying types as major or minor themes of their works. David Drake has often written of

13395-638: The growth and decomposition of biomass into soil . Earth's mechanically rigid outer layer of Earth's crust and upper mantle , the lithosphere , is divided into tectonic plates . These plates are rigid segments that move relative to each other at one of three boundaries types: at convergent boundaries , two plates come together; at divergent boundaries , two plates are pulled apart; and at transform boundaries , two plates slide past one another laterally. Along these plate boundaries, earthquakes, volcanic activity , mountain-building , and oceanic trench formation can occur. The tectonic plates ride on top of

13536-404: The heat in Earth is lost through plate tectonics, by mantle upwelling associated with mid-ocean ridges . The final major mode of heat loss is through conduction through the lithosphere, the majority of which occurs under the oceans. The gravity of Earth is the acceleration that is imparted to objects due to the distribution of mass within Earth. Near Earth's surface, gravitational acceleration

13677-489: The horrors and futility of war. He has said, in the afterwords of several of his Hammer's Slammers books (1979 and later), that one of his reasons for writing is to educate those people who have not experienced war, but who might have to make the decision to start or endorse a war (as policymakers or as voters) about what war is really like, and what the powers and limits of the military as an instrument of policy are. David Weber has said: For me, military science fiction

13818-406: The land surface is taken by the four continental landmasses , which are (in descending order): Africa-Eurasia , America (landmass) , Antarctica , and Australia (landmass) . These landmasses are further broken down and grouped into the continents . The terrain of the land surface varies greatly and consists of mountains, deserts , plains , plateaus , and other landforms . The elevation of

13959-508: The land surface varies from a low point of −418 m (−1,371 ft) at the Dead Sea , to a maximum altitude of 8,848 m (29,029 ft) at the top of Mount Everest . The mean height of land above sea level is about 797 m (2,615 ft). Land can be covered by surface water , snow, ice, artificial structures or vegetation. Most of Earth's land hosts vegetation, but considerable amounts of land are ice sheets (10%, not including

14100-399: The launch of yet another Kzin fleet against Earth. A number of specialists traveled aboard this ship, using Slaver stasis fields for lithobraking , and successfully assassinated the Kzin military leader on Wunderland, Chuut-Riit. Despite this setback for the Kzin cause, preparations for a fifth and decisive assault fleet were nearing completion. At this point, a passing Outsider ship sold

14241-399: The lithosphere, which is divided into independently moving tectonic plates. Beneath the lithosphere is the asthenosphere , a relatively low-viscosity layer on which the lithosphere rides. Important changes in crystal structure within the mantle occur at 410 and 660 km (250 and 410 mi) below the surface, spanning a transition zone that separates the upper and lower mantle. Beneath

14382-410: The loss of oxygen in the atmosphere, making current animal life impossible. Due to the increased luminosity, Earth's mean temperature may reach 100 °C (212 °F) in 1.5 billion years, and all ocean water will evaporate and be lost to space, which may trigger a runaway greenhouse effect , within an estimated 1.6 to 3 billion years. Even if the Sun were stable, a fraction of the water in

14523-456: The lowercase when it is preceded by "the", such as "the atmosphere of the earth". It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing?" The name Terra / ˈ t ɛr ə / occasionally is used in scientific writing and especially in science fiction to distinguish humanity's inhabited planet from others, while in poetry Tellus / ˈ t ɛ l ə s / has been used to denote personification of

14664-497: The magnetosphere. During magnetic storms and substorms , charged particles can be deflected from the outer magnetosphere and especially the magnetotail, directed along field lines into Earth's ionosphere , where atmospheric atoms can be excited and ionized, causing an aurora . Earth's rotation period relative to the Sun—its mean solar day—is 86,400 seconds of mean solar time ( 86,400.0025 SI seconds ). Because Earth's solar day

14805-409: The magnetosphere; solar wind pressure compresses the day-side of the magnetosphere, to about 10 Earth radii, and extends the night-side magnetosphere into a long tail. Because the velocity of the solar wind is greater than the speed at which waves propagate through the solar wind, a supersonic bow shock precedes the day-side magnetosphere within the solar wind. Charged particles are contained within

14946-478: The magnetosphere; the plasmasphere is defined by low-energy particles that essentially follow magnetic field lines as Earth rotates. The ring current is defined by medium-energy particles that drift relative to the geomagnetic field, but with paths that are still dominated by the magnetic field, and the Van Allen radiation belts are formed by high-energy particles whose motion is essentially random, but contained in

15087-417: The mantle, an extremely low viscosity liquid outer core lies above a solid inner core . Earth's inner core may be rotating at a slightly higher angular velocity than the remainder of the planet, advancing by 0.1–0.5° per year, although both somewhat higher and much lower rates have also been proposed. The radius of the inner core is about one-fifth of that of Earth. The density increases with depth. Among

15228-600: The mantle. Due to this recycling, most of the ocean floor is less than 100 Ma old. The oldest oceanic crust is located in the Western Pacific and is estimated to be 200 Ma old. By comparison, the oldest dated continental crust is 4,030 Ma , although zircons have been found preserved as clasts within Eoarchean sedimentary rocks that give ages up to 4,400 Ma , indicating that at least some continental crust existed at that time. The seven major plates are

15369-410: The military become "more resourceful." The German military is also using science fiction to help its military but in its approach, they do not hire science fiction writers to develop scenarios. Instead, they "use existing science fiction" to help the army "predict the "world's next potential conflict." The UK Ministry of Defence (MOD) hired two science fiction writers to pen short stories about "what

15510-481: The military cannot directly study for "ethical reasons, such as Autonomous Lethality Weapon Systems (ALWS), or augmented humans." The French military says the authors are asked to imagine warfare situations that "destabilize us, scare us, blame, or even beat us", in order to provide the army with a "fresh set of practice scenarios". Military planners use the science fiction authors' scenarios to "prepare for previously unthought of situations", "boos[t] creativity" and help

15651-548: The modern oceans will descend to the mantle , due to reduced steam venting from mid-ocean ridges. The Sun will evolve to become a red giant in about 5 billion years . Models predict that the Sun will expand to roughly 1  AU (150 million km; 93 million mi), about 250 times its present radius. Earth's fate is less clear. As a red giant, the Sun will lose roughly 30% of its mass, so, without tidal effects, Earth will move to an orbit 1.7 AU (250 million km; 160 million mi) from

15792-399: The mother of Thor . Historically, "Earth" has been written in lowercase. Beginning with the use of Early Middle English , its definite sense as "the globe" was expressed as "the earth". By the era of Early Modern English , capitalization of nouns began to prevail , and the earth was also written the Earth , particularly when referenced along with other heavenly bodies. More recently,

15933-424: The name is sometimes simply given as Earth , by analogy with the names of the other planets , though "earth" and forms with "the earth" remain common. House styles now vary: Oxford spelling recognizes the lowercase form as the more common, with the capitalized form an acceptable variant. Another convention capitalizes "Earth" when appearing as a name, such as a description of the "Earth's atmosphere", but employs

16074-425: The newly forming Sun had only 70% of its current luminosity . By 3.5 Ga , Earth's magnetic field was established, which helped prevent the atmosphere from being stripped away by the solar wind . As the molten outer layer of Earth cooled it formed the first solid crust , which is thought to have been mafic in composition. The first continental crust , which was more felsic in composition, formed by

16215-586: The ocean may have covered Earth completely. The world ocean is commonly divided into the Pacific Ocean, Atlantic Ocean, Indian Ocean, Antarctic or Southern Ocean , and Arctic Ocean, from largest to smallest. The ocean covers Earth's oceanic crust , with the shelf seas covering the shelves of the continental crust to a lesser extent. The oceanic crust forms large oceanic basins with features like abyssal plains , seamounts , submarine volcanoes , oceanic trenches , submarine canyons , oceanic plateaus , and

16356-648: The oceanic plates, with the Cocos Plate advancing at a rate of 75 mm/a (3.0 in/year) and the Pacific Plate moving 52–69 mm/a (2.0–2.7 in/year). At the other extreme, the slowest-moving plate is the South American Plate, progressing at a typical rate of 10.6 mm/a (0.42 in/year). Earth's interior, like that of the other terrestrial planets, is divided into layers by their chemical or physical ( rheological ) properties. The outer layer

16497-688: The only one in the Solar System sustaining liquid surface water . Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust . The remaining 29.2% of Earth's crust is land, most of which is located in the form of continental landmasses within Earth's land hemisphere . Most of Earth's land is at least somewhat humid and covered by vegetation , while large sheets of ice at Earth's polar deserts retain more water than Earth's groundwater , lakes, rivers and atmospheric water combined. Earth's crust consists of slowly moving tectonic plates , which interact to produce mountain ranges, volcanoes , and earthquakes. Earth has

16638-581: The orbit of maximum axial tilt toward or away from the Sun—and the equinoxes , when Earth's rotational axis is aligned with its orbital axis. In the Northern Hemisphere, winter solstice currently occurs around 21 December; summer solstice is near 21 June, spring equinox is around 20 March and autumnal equinox is about 22 or 23 September. In the Southern Hemisphere, the situation is reversed, with

16779-625: The ozone layer, life colonized Earth's surface. Among the earliest fossil evidence for life is microbial mat fossils found in 3.48 billion-year-old sandstone in Western Australia , biogenic graphite found in 3.7 billion-year-old metasedimentary rocks in Western Greenland , and remains of biotic material found in 4.1 billion-year-old rocks in Western Australia. The earliest direct evidence of life on Earth

16920-469: The partial melting of this mafic crust. The presence of grains of the mineral zircon of Hadean age in Eoarchean sedimentary rocks suggests that at least some felsic crust existed as early as 4.4 Ga , only 140  Ma after Earth's formation. There are two main models of how this initial small volume of continental crust evolved to reach its current abundance: (1) a relatively steady growth up to

17061-501: The past 66 Mys , and several million years ago, an African ape species gained the ability to stand upright. This facilitated tool use and encouraged communication that provided the nutrition and stimulation needed for a larger brain, which led to the evolution of humans . The development of agriculture , and then civilization , led to humans having an influence on Earth and the nature and quantity of other life forms that continues to this day. Earth's expected long-term future

17202-478: The planet's environment . Humanity's current impact on Earth's climate and biosphere is unsustainable , threatening the livelihood of humans and many other forms of life, and causing widespread extinctions . The Modern English word Earth developed, via Middle English , from an Old English noun most often spelled eorðe . It has cognates in every Germanic language , and their ancestral root has been reconstructed as * erþō . In its earliest attestation,

17343-400: The planet. The water vapor acts as a greenhouse gas and, together with other greenhouse gases in the atmosphere, particularly carbon dioxide (CO 2 ), creates the conditions for both liquid surface water and water vapor to persist via the capturing of energy from the Sun's light . This process maintains the current average surface temperature of 14.76 °C (58.57 °F), at which water

17484-421: The polar Northern and Southern hemispheres; or by longitude into the continental Eastern and Western hemispheres. Most of Earth's surface is ocean water: 70.8% or 361 million km (139 million sq mi). This vast pool of salty water is often called the world ocean , and makes Earth with its dynamic hydrosphere a water world or ocean world . Indeed, in Earth's early history

17625-509: The popularity of the genre. Short stories also were popular, collected in books such as Combat SF , edited by Gordon R. Dickson . This anthology includes one of the first Hammer's Slammers stories, as well as one of the BOLO stories by Keith Laumer and one of the Berserker stories by Fred Saberhagen . This anthology seems to have been the first time these stories specifically dealing with war as

17766-490: The present day, which is supported by the radiometric dating of continental crust globally and (2) an initial rapid growth in the volume of continental crust during the Archean , forming the bulk of the continental crust that now exists, which is supported by isotopic evidence from hafnium in zircons and neodymium in sedimentary rocks. The two models and the data that support them can be reconciled by large-scale recycling of

17907-493: The rates of mantle convection and plate tectonics, and allowing the production of uncommon igneous rocks such as komatiites that are rarely formed today. The mean heat loss from Earth is 87 mW m , for a global heat loss of 4.42 × 10  W . A portion of the core's thermal energy is transported toward the crust by mantle plumes , a form of convection consisting of upwellings of higher-temperature rock. These plumes can produce hotspots and flood basalts . More of

18048-430: The rest of the human military: A war game called Trolls and Bridges , and a book, The Heroic Myth of Lieutenant Nora Argamentine . Written by Clandeboye, they are a fictionalized account of the diary of his cousin, Nora Argamentine. She was a U.N. officer caught by Kzinti, who later rebelled against them before being gradually lobotomized . The book becomes extremely popular and helps raise morale, as well as cultivating

18189-408: The series, although the majority of content has been written by other authors. The resulting series has also been described as a "franchise". Initially, there were only plans for two volumes. Niven, along with John Hewitt (one of the main writers for the Ringworld RPG ) composed a "Bible" for aspiring writers, including several pages of notes composed between the two of them and photocopied pages of

18330-515: The shape of an ellipsoid , bulging at its Equator ; its diameter is 43 kilometres (27 mi) longer there than at its poles . Earth's shape also has local topographic variations; the largest local variations, like the Mariana Trench (10,925 metres or 35,843 feet below local sea level), shortens Earth's average radius by 0.17% and Mount Everest (8,848 metres or 29,029 feet above local sea level) lengthens it by 0.14%. Since Earth's surface

18471-574: The start of The Ringworld Engineers . This war is chronicled in considerable detail in the novel Destiny's Forge . The war begins on an unknown date, with Kzinti suicide attacks on Epsilon Eridani . During the war, human adventurers engage in similar suicide attacks on Kzinti harems . The war ends in 2505 with the signing of the Covenants of Shasht, named after a Kzinti world which is annexed by Humans and later renamed Fafnir. The Kzinti are disarmed and restricted to police weapons only. This restriction

18612-476: The story is incompatible with Juggler of Worlds , which is co-authored by Niven and Edward M. Lerner . Conversely, Niven's story "Fly-By-Night" refers directly to, and summarizes, the events of "Telepath's Dance", so it appears he considers that story canonical. The canonicity of other stories in the series is undetermined. Many of the stories in the series have added details to Known Space and its history, details which may be incompatible with older stories in

18753-401: The tactics and strategy of this new course of the war in detail, showing how American, British, Soviet, and German soldiers and Jewish guerrillas (some of them historical figures) deal with this extraordinary new situation, as well as providing a not unsympathetic detailed point of view of individual invader warriors. In the war situation posited by Turtledove, the invaders have superior arms, but

18894-737: The time. The Vietnam War led to the "polarization of the sf community", which can be seen in the June 1968 issue of Galaxy Science Fiction , in which one page of pro-war sf authors listed their names and on another page, anti-war sf authors put their names. The Vietnam War has been noted by the Encyclopedia of Science Fiction as having impacted anthologies such as In the Field of Fire (1987) and novels such as The Healer's War (1988) by Elizabeth Ann Scarborough and Dream Baby (1989) by Bruce McAllister . The Encyclopedia of Science Fiction states that

19035-451: The use of Fictional Intelligence ( FicInt ), which they define as "useful fictions". FicInt, a concept developed by Cole in 2015, combines "fiction writing with intelligence to imagine future scenarios in ways grounded in reality." Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life . This is enabled by Earth being an ocean world ,

19176-427: The warlike aliens, although the transmissions were initially dismissed as an outbreak of psychosis. Then a similar encounter between another human ship and the Kzin vessel led to the destruction of the more primitive human ship. However, one of the human prisoners, with the aid of a rogue telepath, was able to escape to the Angel's Pencil and warn them of the danger of their increasing penetration into Kzinti space. In

19317-485: The wars of tomorrow will look like." The MOD hired Peter Warren Singer and August Cole to write eight short stories about threats from "emerging technologies" including " artificial intelligence (AI), data modeling, drone swarms, quantum computing and human enhancement" in a battlefield context. The MOD hired sci-fi writers because they have a "unique ability to imagine the unimaginable." As well, both authors know about "security subjects and modern warfare." They advocate

19458-456: The word eorðe was used to translate the many senses of Latin terra and Greek γῆ gē : the ground, its soil , dry land, the human world, the surface of the world (including the sea), and the globe itself. As with Roman Terra /Tellūs and Greek Gaia , Earth may have been a personified goddess in Germanic paganism : late Norse mythology included Jörð ("Earth"), a giantess often given as

19599-598: The year. This causes the seasonal change in climate, with summer in the Northern Hemisphere occurring when the Tropic of Cancer is facing the Sun, and in the Southern Hemisphere when the Tropic of Capricorn faces the Sun. In each instance, winter occurs simultaneously in the opposite hemisphere. During the summer, the day lasts longer, and the Sun climbs higher in the sky. In winter, the climate becomes cooler and

19740-468: Was in the middle of the "Long Peace". ARM , the United Nations security forces, has completely suppressed all "dangerous" technologies, histories, mental illnesses, and media, leading to not only an end of the war and almost all violent crimes, but a change in society so vast that most people have a difficulty even conceptualizing such things. The U.N.'s reach was limited to Earth , however. There were

19881-675: Was still in effect as late as 2657, as specified in The Soft Weapon . Over the next decades and centuries, some Kzinti dream of another war, and go to great lengths (such as piracy, seeking Slaver stasis boxes, and going to the Ringworld ) in an attempt to gain enough of an upper hand to begin one. There is at least one "major incident" after the Fourth War, which some humans describe as another "war" (see Flatlander ). However, each Man-Kzin War ends with

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