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155-761: Ill Bethisad is a collaborative alternate history project which had 58 active participants as of March 2021. Originally created by Andrew Smith from New Zealand , it was initiated in 1997 as the Brithenig Project . It can be characterized as an instance of the subgenre of steampunk . Ill Bethisad has a largely encyclopedic character, consisting of constructed languages, written histories, timelines, news items, maps, flags and other images, short movies, descriptions of cultures, religions and technologies, as well as short stories. Constructed languages play an important role in Ill Bethisad, and it can be said that Ill Bethisad

310-523: A Megaduke and commander of its armies and manages to fight off the invading Ottoman armies of Mehmet II . He saves the city from Islamic conquest , and even chases the Turks deeper into lands they had previously conquered. One of the earliest works of alternate history published in large quantities for the reception of a large audience may be Louis Geoffroy 's Histoire de la Monarchie universelle : Napoléon et la conquête du monde (1812–1832) (History of

465-431: A multiverse of alternative worlds, complete with the paratime travel machines that would later become popular with American pulp writers. However, since his hero experiences only a single alternate world, the story is not very different from conventional alternate history. In the 1930s, alternate history moved into a new arena. The December 1933 issue of Astounding published Nat Schachner 's "Ancestral Voices", which

620-420: A statistical law, so decreasing entropy and non-increasing entropy are not impossible, just improbable. Additionally, entropy statistically increases in systems which are isolated, so non-isolated systems, such as an object, that interact with the outside world, can become less worn and decrease in entropy, and it's possible for an object whose world-line forms a closed loop to be always in the same condition in

775-411: A time machine . The idea of a time machine was popularized by H. G. Wells 's 1895 novel The Time Machine . It is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality . Forward time travel, outside the usual sense of the perception of time , is an extensively observed phenomenon and is well understood within

930-455: A POD only to explain the existence and make no use of the concept, or may present the universe without explanation of its existence. Isaac Asimov 's short story " What If— " (1952) is about a couple who can explore alternate realities by means of a television-like device. This idea can also be found in Asimov's novel The End of Eternity (1955), in which the "Eternals" can change the realities of

1085-412: A Pennsylvania State Police officer, who knows how to make gunpowder, is transported from our world to an alternate universe where the recipe for gunpowder is a tightly held secret and saves a country that is about to be conquered by its neighbors. The paratime patrol members are warned against going into the timelines immediately surrounding it, where the country will be overrun, but the book never depicts

1240-460: A Union victory at the Battle of Gettysburg. When a story's assumptions about the nature of time travel lead to the complete replacement of the visited time's future, rather than just the creation of an additional time line, the device of a "time patrol" is often used where guardians move through time to preserve the "correct" history. A more recent example is Making History by Stephen Fry in which

1395-465: A bitter war with the "Spanish" in Mexico (the chief scientist at the laboratory where the experiment occurred is described as a Gnostic, and references to Christian Gnosticism appear repeatedly in the book). Although not dealing in physical time travel, in his alt-history novel Marx Returns , Jason Barker introduces anachronisms into the life and times of Karl Marx , such as when his wife Jenny sings

1550-664: A cave and emerging hundreds of years later. This narrative describes divine protection and time suspension. Another similar story in the Islamic tradition is of Uzair (usually identified with the Biblical Ezra ) whose grief at the Destruction of Jerusalem by the Babylonians was so great that God took his soul and brought him back to life after Jerusalem was reconstructed. He rode on his revived donkey and entered his native place. But

1705-579: A cave circa 250 AD, to escape the persecution of Christians during the reign of the Roman emperor Decius . They fell into a sleep and woke some 200 years later during the reign of Theodosius II , to discover that the Empire had become Christian. This Christian story is recounted by Islam and appears in a Sura of the Quran , Sura Al-Kahf . The version recalls a group of young monotheists escaping from persecution within

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1860-412: A certain drug, and the agent is constantly trying to maximize the consistency of behavior among his alternate selves, attempting to compensate for events and thoughts he experiences, he guesses are of low measure relative to those experienced by most of his other selves. Many writers—perhaps the majority—avoid the discussion entirely. In one novel of this type, H. Beam Piper's Lord Kalvan of Otherwhen ,

2015-546: A character in Ada makes a long-distance call, all the toilets in the house flush at once to provide hydraulic power. Guido Morselli described the defeat of Italy (and subsequently France) in World War I in his novel, Past Conditional (1975; Contro-passato prossimo ), wherein the static Alpine front line which divided Italy from Austria during that war collapses when the Germans and

2170-644: A cylinder is infinitely long and spins fast enough about its long axis, then a spaceship flying around the cylinder on a spiral path could travel back in time (or forward, depending on the direction of its spiral). However, the density and speed required is so great that ordinary matter is not strong enough to construct it. Physicist Ronald Mallett is attempting to recreate the conditions of a rotating black hole with ring lasers, in order to bend spacetime and allow for time travel. A more fundamental objection to time travel schemes based on rotating cylinders or cosmic strings has been put forward by Stephen Hawking, who proved

2325-471: A definitive judgment on the issue without a theory of quantum gravity to join quantum mechanics and general relativity into a completely unified theory. The theory of general relativity describes the universe under a system of field equations that determine the metric , or distance function, of spacetime. There exist exact solutions to these equations that include closed time-like curves , which are world lines that intersect themselves; some point in

2480-618: A different history. "Sidewise in Time" has been described as "the point at which the alternate history narrative first enters science fiction as a plot device" and is the story for which the Sidewise Award for Alternate History is named. A somewhat similar approach was taken by Robert A. Heinlein in his 1941 novelette Elsewhen in which a professor trains his mind to move his body across timelines. He then hypnotizes his students so that they can explore more of them. Eventually, each settles into

2635-501: A different universe than the one they came from; it's been argued that since the traveler arrives in a different universe's history and not their own history, this is not "genuine" time travel. The accepted many-worlds interpretation suggests that all possible quantum events can occur in mutually exclusive histories. However, some variations allow different universes to interact. This concept is most often used in science-fiction, but some physicists such as David Deutsch have suggested that

2790-764: A divided United States , in which the Empire of Japan takes the Pacific states, governing them as a puppet, Nazi Germany takes the East Coast of the United States and parts of the Midwest , with the remnants of the old United States' government as the Neutral Zone, a buffer state between the two superpowers. The book has inspired an Amazon series of the same name . Vladimir Nabokov 's novel, Ada or Ardor: A Family Chronicle (1969),

2945-452: A finite cylinder might produce closed timelike curves if the rotation rate were fast enough, he did not prove this. But Hawking points out that because of his theorem, "it can't be done with positive energy density everywhere! I can prove that to build a finite time machine, you need negative energy." This result comes from Hawking's 1992 paper on the chronology protection conjecture , which Hawking states as "The laws of physics do not allow

3100-438: A large gravity well such as a black hole . A time machine that utilizes this principle might be, for instance, a spherical shell with a diameter of five meters and the mass of Jupiter . A person at its center will travel forward in time at a rate four times slower than that of distant observers. Squeezing the mass of a large planet into such a small structure is not expected to be within humanity's technological capabilities in

3255-474: A nation. It assumes that by giving a nation an alternative history, alternative values can be made to grow." In the English language, the first known complete alternate history may be Nathaniel Hawthorne 's short story " P.'s Correspondence ", published in 1845. It recounts the tale of a man who is considered "a madman" due to his perceptions of a different 1845, a reality in which long-dead famous people, such as

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3410-415: A pair of prisms that had been moved up to 3 ft (0.91 m) apart, using a phenomenon known as quantum tunneling . Nimtz told New Scientist magazine: "For the time being, this is the only violation of special relativity that I know of." However, other physicists say that this phenomenon does not allow information to be transmitted faster than light. Aephraim M. Steinberg , a quantum optics expert at

3565-459: A region of spacetime that is warped a certain way, and hence time travelers would not be able to travel back to earlier regions in spacetime, before this region existed. Stephen Hawking stated that this would explain why the world has not already been overrun by "tourists from the future". Several experiments have been carried out to try to entice future humans, who might invent time travel technology, to come back and demonstrate it to people of

3720-454: A scientific basis for the possibility of backward time travel in certain unusual scenarios, although arguments from semiclassical gravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed. These semiclassical arguments led Stephen Hawking to formulate the chronology protection conjecture , suggesting that the fundamental laws of nature prevent time travel, but physicists cannot come to

3875-403: A signal, some form of classical communication must also be used. The no-communication theorem also gives a general proof that quantum entanglement cannot be used to transmit information faster than classical signals. A variation of Hugh Everett 's many-worlds interpretation (MWI) of quantum mechanics provides a resolution to the grandfather paradox that involves the time traveler arriving in

4030-637: A sixteen-part epic comic book series called Captain Confederacy began examining a world where the Confederate States of America won the American Civil War . In the series, the Captain and others heroes are staged government propaganda events featuring the feats of these superheroes. Since the late 1990s, Harry Turtledove has been the most prolific practitioner of alternate history and has been given

4185-410: A small amount of proper time passes for them, while a large amount of proper time passes elsewhere. This can be achieved by traveling at relativistic speeds or through the effects of gravity . For two identical clocks moving relative to each other without accelerating, each clock measures the other to be ticking slower. This is possible due to the relativity of simultaneity . However, the symmetry

4340-592: A staple of the alternate history genre. A number of alternate history stories and novels appeared in the late 19th and early 20th centuries (see, for example, Joseph Edgar Chamberlin 's The Ifs of History [1907] and Charles Petrie 's If: A Jacobite Fantasy [1926]). In 1931, British historian Sir John Squire collected a series of essays from some of the leading historians of the period for his anthology If It Had Happened Otherwise . In that work, scholars from major universities, as well as important non-academic authors, turned their attention to such questions as "If

4495-470: A subgenre of science fiction , alternative history is a genre of fiction wherein the author speculates upon how the course of history might have been altered if a particular historical event had an outcome different from the real life outcome. An alternate history requires three conditions: (i) A point of divergence from the historical record, before the time in which the author is writing; (ii) A change that would alter known history; and (iii) An examination of

4650-499: A symmetric polygon could still act as a time machine, although he concludes that this is more likely a flaw in classical quantum gravity theory rather than proof that causality violation is possible. Another approach involves a dense spinning cylinder usually referred to as a Tipler cylinder , a GR solution discovered by Willem Jacob van Stockum in 1936 and Kornel Lanczos in 1924, but not recognized as allowing closed timelike curves until an analysis by Frank Tipler in 1974. If

4805-470: A theorem showing that according to general relativity it is impossible to build a time machine of a special type (a "time machine with the compactly generated Cauchy horizon") in a region where the weak energy condition is satisfied, meaning that the region contains no matter with negative energy density ( exotic matter ). Solutions such as Tipler's assume cylinders of infinite length, which are easier to analyze mathematically, and although Tipler suggested that

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4960-619: A third. Robinson explores world history from that point in AD 1405 (807 AH ) to about AD 2045 (1467 AH). Rather than following the great man theory of history, focusing on leaders, wars, and major events, Robinson writes more about social history , similar to the Annales School of history theory and Marxist historiography , focusing on the lives of ordinary people living in their time and place. Philip Roth 's novel, The Plot Against America (2004), looks at an America where Franklin D. Roosevelt

5115-503: A time machine is used to alter history so that Adolf Hitler was never born. That ironically results in a more competent leader of Nazi Germany and results in the country's ascendancy and longevity in the altered timeline. While many justifications for alternate histories involve a multiverse , the "many world" theory would naturally involve many worlds, in fact a continually exploding array of universes. In quantum theory, new worlds would proliferate with every quantum event, and even if

5270-554: A time traveler should end up in a different history than the one he started from. On the other hand, Stephen Hawking has argued that even if the MWI is correct, we should expect each time traveler to experience a single self-consistent history, so that time travelers remain within their own world rather than traveling to a different one. The physicist Allen Everett argued that Deutsch's approach "involves modifying fundamental principles of quantum mechanics; it certainly goes beyond simply adopting

5425-427: A traversable wormhole would require the existence of a substance with negative energy , often referred to as " exotic matter ". More technically, the wormhole spacetime requires a distribution of energy that violates various energy conditions , such as the null energy condition along with the weak, strong, and dominant energy conditions. However, it is known that quantum effects can lead to small measurable violations of

5580-411: A tyrannical US Government brushes aside the warnings of scientists about the dangers of time travel and goes on with a planned experiment - with the result that minor changes to the prehistoric past cause Humanity to never have existed, its place taken by tentacled underwater intelligent creatures - who also have a tyrannical government which also insists on experimenting with time-travel. Time travel as

5735-416: A vacuum. His experiment involved slow light as well as passing light through a vacuum. He generated two single photons , passing one through rubidium atoms that had been cooled with a laser (thus slowing the light) and passing one through a vacuum. Both times, apparently, the precursors preceded the photons' main bodies, and the precursor traveled at c in a vacuum. According to Du, this implies that there

5890-427: A vehicle to expound them. This book introduced the idea of a person being transported from a point in our familiar world to the precise geographical equivalent point in an alternate world in which history had gone differently. The protagonists undergo various adventures in the alternate world, and then are finally transported back to our world, again to the precise geographical equivalent point. Since then, that has become

6045-531: A verse from the Sex Pistols 's song " Anarchy in the U.K. ", or in the games of chess she plays with the Marxes' housekeeper Helene Demuth , which on one occasion involves a Caro–Kann Defence . In her review of the novel, Nina Power writes of "Jenny's 'utopian' desire for an end to time", an attitude which, according to Power, is inspired by her husband's co-authored book The German Ideology . However, in keeping with

6200-478: A wormhole with such an induced clock difference could not be brought together without inducing quantum field and gravitational effects that would either make the wormhole collapse or the two mouths repel each other. Because of this, the two mouths could not be brought close enough for causality violation to take place. However, in a 1997 paper, Visser hypothesized that a complex " Roman ring " (named after Tom Roman) configuration of an N number of wormholes arranged in

6355-491: Is a form of historiography that explores historical events in an extrapolated timeline in which key historical events either did not occur or had an outcome different from the historical record, in order to understand what did happen. The earliest example of alternate (or counterfactual) history is found in Livy 's Ab Urbe Condita Libri (book IX, sections 17–19). Livy contemplated an alternative 4th century BC in which Alexander

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6510-405: Is a story of incest that takes place within an alternate North America settled in part by Czarist Russia and that borrows from Dick's idea of "alternate-alternate" history (the world of Nabokov's hero is wracked by rumors of a "counter-earth" that apparently is ours). Some critics believe that the references to a counter-earth suggest that the world portrayed in Ada is a delusion in the mind of

6665-574: Is an invented Slavic language that in many respects is closer to Czech than our world's Croatian, and the Dalmatian of Ill Bethisad seems to be influenced by Slavic languages more than its real world counterpart. The central point of divergence of Ill Bethisad is a stronger Roman Empire . Nevertheless, history runs mostly parallel to the history of the real world, so that many countries and regions have their own separate points of divergence: In general, there are more independent countries than there are in

6820-505: Is another attempt to portray a Utopian society. In Aristopia , the earliest settlers in Virginia discover a reef made of solid gold and are able to build a Utopian society in North America . In 1905, H. G. Wells published A Modern Utopia . As explicitly noted in the book itself, Wells's main aim in writing it was to set out his social and political ideas, the plot serving mainly as

6975-452: Is broken if one clock accelerates, allowing for less proper time to pass for one clock than the other. The twin paradox describes this: one twin remains on Earth, while the other undergoes acceleration to relativistic speed as they travel into space, turn around, and travel back to Earth; the traveling twin ages less than the twin who stayed on Earth, because of the time dilation experienced during their acceleration. General relativity treats

7130-477: Is defeated in 1940 in his bid for a third term as President of the United States, and Charles Lindbergh is elected, leading to a US that features increasing fascism and anti-Semitism. Michael Chabon , occasionally an author of speculative fiction, contributed to the genre with his novel The Yiddish Policemen's Union (2007), which explores a world in which the State of Israel was destroyed in its infancy and many of

7285-454: Is disputed. Presentism is a school of philosophy that holds that the future and the past exist only as changes that occurred or will occur to the present, and they have no real existence of their own. In this view, time travel is impossible because there is no future or past to travel to. Keller and Nelson have argued that even if past and future objects do not exist, there can still be definite truths about past and future events, and thus it

7440-501: Is highly unlikely to be possible. Any theory that would allow time travel would introduce potential problems of causality . The classic example of a problem involving causality is the " grandfather paradox ," which postulates travelling to the past and intervening in the conception of one's ancestors (causing the death of an ancestor before conception being frequently cited). Some physicists, such as Novikov and Deutsch, suggested that these sorts of temporal paradoxes can be avoided through

7595-447: Is impossible for the time traveler to "change" history in any way. The time traveler's actions may be the cause of events in their own past though, which leads to the potential for circular causation , sometimes called a predestination paradox, ontological paradox, or bootstrap paradox. The term bootstrap paradox was popularized by Robert A. Heinlein 's story " By His Bootstraps ". The Novikov self-consistency principle proposes that

7750-460: Is in ruins, and his family has died. One story in Judaism concerns Honi HaMe'agel , a miracle-working sage of the 1st century BC, who was a historical character to whom various myths were attached. While traveling one day, Honi saw a man planting a carob tree and asked him about it. The man explained that the tree would take 70 years to bear fruit, and that he was planting it not for himself but for

7905-536: Is no ' Silicon Valley ' of North America, but information technology centres are instead found in Ireland . Alternate history (fiction) Since the 1950s, as a subgenre of science fiction, some alternative history stories have featured the tropes of time travel between histories, the psychic awareness of the existence of an alternative universe by the inhabitants of a given universe, and time travel that divides history into various timestreams . Often described as

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8060-512: Is no possibility of light traveling faster than c and, thus, no possibility of violating causality. Many have argued that the absence of time travelers from the future demonstrates that such technology will never be developed, suggesting that it is impossible. This is analogous to the Fermi paradox related to the absence of evidence of extraterrestrial life. As the absence of extraterrestrial visitors does not categorically prove they do not exist, so

8215-429: Is observed when one correlates measurements of idler photons to the corresponding signal photons. However, since interference can be observed only after the idler photons are measured and they are correlated with the signal photons, there is no way for experimenters to tell what choice will be made in advance just by looking at the signal photons, only by gathering classical information from the entire system; thus causality

8370-434: Is possible that a future truth about a time traveler deciding to travel back to the present date could explain the time traveler's actual appearance in the present; these views are contested by some authors. A common objection to the idea of traveling back in time is put forth in the grandfather paradox or the argument of auto-infanticide. If one were able to go back in time, inconsistencies and contradictions would ensue if

8525-488: Is preserved. The experiment of Lijun Wang might also show causality violation since it made it possible to send packages of waves through a bulb of caesium gas in such a way that the package appeared to exit the bulb 62 nanoseconds before its entry, but a wave package is not a single well-defined object but rather a sum of multiple waves of different frequencies (see Fourier analysis ), and the package can appear to move faster than light or even backward in time even if none of

8680-521: Is received before it is sent, in all reference frames. The signal could be said to have moved backward in time. This hypothetical scenario is sometimes referred to as a tachyonic antitelephone . Quantum-mechanical phenomena such as quantum teleportation , the EPR paradox , or quantum entanglement might appear to create a mechanism that allows for faster-than-light (FTL) communication or time travel, and in fact some interpretations of quantum mechanics such as

8835-664: Is set in Europe following the Nazi victory. The novel Dominion by C.J. Sansom (2012) is similar in concept but is set in England, with Churchill the leader of an anti-German Resistance and other historic persons in various fictional roles. In the Mecha Samurai Empire series (2016), Peter Tieryas focuses on the Asian-American side of the alternate history, exploring an America ruled by

8990-468: Is still being researched. Wormholes are a hypothetical warped spacetime permitted by the Einstein field equations of general relativity. A proposed time-travel machine using a traversable wormhole would hypothetically work in the following way: One end of the wormhole is accelerated to some significant fraction of the speed of light, perhaps with some advanced propulsion system , and then brought back to

9145-488: Is suggested that, had Gordon Banks been fit to play in the 1970 FIFA World Cup quarter-final, there would have been no Thatcherism and the post-war consensus would have continued indefinitely. Kim Stanley Robinson 's novel, The Years of Rice and Salt (2002), starts at the point of divergence with Timur turning his army away from Europe, and the Black Death has killed 99% of Europe's population, instead of only

9300-497: Is the central meeting point, if not the cradle, of an entire subgenre of conlangs, namely alternative languages . To date there are over thirty languages at varying levels of construction that play part. Among the languages spoken in Ill Bethisad are Brithenig (a Romance language with strong Celtic substrate influences, based on Welsh ), Wenedyk ( Polish as a Romance language), Bohemian ( Pémišna : Germanized Czech ), Dalmatian (a Romance language similar to Romanian , based on

9455-503: Is usually connected only with quantum mechanics or wormholes . Some ancient myths depict a character skipping forward in time. In Hindu mythology, the Vishnu Purana mentions the story of King Raivata Kakudmi , who travels to heaven to meet the creator Brahma and is surprised to learn when he returns to Earth that many ages have passed. The Buddhist Pāli Canon mentions the relativity of time. The Payasi Sutta tells of one of

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9610-597: The Bohm interpretation presume that some information is being exchanged between particles instantaneously in order to maintain correlations between particles. This effect was referred to as " spooky action at a distance " by Einstein. Nevertheless, the fact that causality is preserved in quantum mechanics is a rigorous result in modern quantum field theories , and therefore modern theories do not allow for time travel or FTL communication . In any specific instance where FTL has been claimed, more detailed analysis has proven that to get

9765-588: The Buddha 's chief disciples, Kumara Kassapa , who explains to the skeptic Payasi that time in the Heavens passes differently than on Earth. The Japanese tale of " Urashima Tarō ", first described in the Manyoshu , tells of a young fisherman named Urashima-no-ko ( 浦嶋子 ) who visits an undersea palace. After three days, he returns home to his village and finds himself 300 years in the future, where he has been forgotten, his house

9920-643: The Crosstime Traffic series for teenagers featuring a variant of H. Beam Piper's paratime trading empire. The concept of a cross-time version of a world war, involving rival paratime empires, was developed in Fritz Leiber 's Change War series, starting with the Hugo Award winning The Big Time (1958); followed by Richard C. Meredith 's Timeliner trilogy in the 1970s, Michael McCollum 's A Greater Infinity (1982) and John Barnes' Timeline Wars trilogy in

10075-469: The Empire of Japan and the Germans (and doing almost as much harm as good in spite of its advanced weapons). The series also explores the cultural impacts of people with 2021 ideals interacting with 1940s culture. Similarly, Robert Charles Wilson 's Mysterium depicts a failed US government experiment which transports a small American town into an alternative version of the US run by Gnostics , who are engaged in

10230-452: The Novikov self-consistency principle or a variation of the many-worlds interpretation with interacting worlds. Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light , such as cosmic strings , traversable wormholes , and Alcubierre drives . The theory of general relativity does suggest

10385-517: The University of Toronto , Canada, uses the analogy of a train traveling from Chicago to New York, but dropping off train cars at each station along the way, so that the center of the train moves forward at each stop; in this way, the speed of the center of the train exceeds the speed of any of the individual cars. Shengwang Du claims in a peer-reviewed journal to have observed single photons' precursors , saying that they travel no faster than c in

10540-755: The Worldwar series , in which aliens invaded Earth during World War II . Other stories by Turtledove include A Different Flesh , in which the Americas were not populated from Asia during the last ice age ; In the Presence of Mine Enemies , in which the Nazis won World War II; and Ruled Britannia , in which the Spanish Armada succeeded in conquering England in the Elizabethan era , with William Shakespeare being given

10695-555: The actual extinct language of the same name ), Xliponian (another Romance language with a superficial resemblance to Albanian , spoken in our world's Epirus ) and several Finnish-like " North Slavic " languages, including Nassian (spoken in our world's Karelia ). The name Ill Bethisad itself is Brithenig for the universe , a calque from Welsh bydysawd or Latin baptizatum . In addition, many other languages from our world have been changed in some way, although some, like German, Italian, or Russian, appear to be exactly

10850-571: The time travel novel Lest Darkness Fall by L. Sprague de Camp in which an American academic travels to Italy at the time of the Byzantine invasion of the Ostrogoths . De Camp's time traveler, Martin Padway, is depicted as making permanent historical changes and implicitly forming a new time branch, thereby making the work an alternate history. In William Tenn 's short story Brooklyn Project (1948),

11005-616: The "World of the Ancients" ( Qin dynasty ) to retrieve a magical bell and then travels forward to the "World of the Future" ( Song dynasty ) to find an emperor who has been exiled in time. However, the time travel is taking place inside an illusory dream world created by the villain to distract and entrap him. Samuel Madden 's Memoirs of the Twentieth Century (1733) is a series of letters from British ambassadors in 1997 and 1998 to diplomats in

11160-522: The "fair world" parallels our history, about fifty years out of step, there is functional magic in the fair world. Even with such explanation, the more explicitly the alternate world resembles a normal fantasy world, the more likely the story is to be labelled fantasy, as in Poul Anderson's "House Rule" and "Loser's Night". In both science fiction and fantasy, whether a given parallel universe is an alternate history may not be clear. The writer might allude to

11315-538: The 1920s. In Jo Walton 's "Small Change" series, the United Kingdom made peace with Hitler before the involvement of the United States in World War II, and slowly collapses due to severe economic depression. Former House Speaker Newt Gingrich and William R. Forstchen have written a novel, 1945 , in which the US defeated Japan but not Germany in World War II, resulting in a Cold War with Germany rather than

11470-484: The 1980s; Chalker's G.O.D. Inc trilogy (1987–89), featuring paratime detectives Sam and Brandy Horowitz, marks the first attempt at merging the paratime thriller with the police procedural. Kurland's Perchance (1988), the first volume of the never-completed "Chronicles of Elsewhen", presents a multiverse of secretive cross-time societies that utilize a variety of means for cross-time travel, ranging from high-tech capsules to mutant powers. Harry Turtledove has launched

11625-468: The 1990s. Such "paratime" stories may include speculation that the laws of nature can vary from one universe to the next, providing a science fictional explanation—or veneer—for what is normally fantasy. Aaron Allston 's Doc Sidhe and Sidhe Devil take place between our world, the "grim world" and an alternate "fair world" where the Sidhe retreated to. Although technology is clearly present in both worlds, and

11780-509: The American Civil War (named the "War of Southron Independence" in this timeline). The protagonist, the autodidact Hodgins Backmaker, travels back to the aforementioned battle and inadvertently changes history, which results in the emergence of our own timeline and the consequent victory of the Union instead. The American humorist author James Thurber parodied alternate history stories about

11935-412: The American Civil War in his 1930 story "If Grant Had Been Drinking at Appomattox", which he accompanied with this very brief introduction: " Scribner's magazine is publishing a series of three articles: 'If Booth Had Missed Lincoln', 'If Lee Had Won the Battle of Gettysburg', and 'If Napoleon Had Escaped to America'. This is the fourth". Another example of alternate history from this period (and arguably

12090-721: The Austrians forsake trench warfare and adopt blitzkrieg twenty years in advance. Kingsley Amis set his novel, The Alteration (1976), in the 20th century, but major events in the Reformation did not take place, and Protestantism is limited to the breakaway Republic of New England. Martin Luther was reconciled to the Roman Catholic Church and later became Pope Germanian I. In Nick Hancock and Chris England 's 1997 book What Didn't Happen Next: An Alternative History of Football it

12245-517: The Church Peter Damian in the 11th century. In his famous work De Divina Omnipotentia , a long letter in which he discusses God 's omnipotence , he treats questions related to the limits of divine power, including the question of whether God can change the past, for example, bringing about that Rome was never founded: I see I must respond finally to what many people, on the basis of your holiness's [own] judgment, raise as an objection on

12400-516: The Great had survived to attack Europe as he had planned; asking, "What would have been the results for Rome if she had been engaged in a war with Alexander?" Livy concluded that the Romans would likely have defeated Alexander. An even earlier possibility is Herodotus 's Histories , which contains speculative material. Another example of counterfactual history was posited by cardinal and Doctor of

12555-620: The Hawaiian Islands. Perhaps the most incessantly explored theme in popular alternate history focuses on the aftermath of an Axis victory in World War II . In some versions, the Nazis and/or Axis Powers win; or in others, they conquer most of the world but a "Fortress America" exists under siege; while in others, there is a Nazi/Japanese Cold War comparable to the US/Soviet equivalent in 'our' timeline. Fatherland (1992), by Robert Harris ,

12710-601: The Imperium is one of the earliest alternate history novels; it was published by Fantastic Stories of the Imagination in 1961, in magazine form, and reprinted by Ace Books in 1962 as one half of an Ace Double . Besides our world, Laumer describes a world ruled by an Imperial aristocracy formed by the merger of European empires, in which the American Revolution never happened, and a third world in post-war chaos ruled by

12865-508: The Japanese Empire while integrating elements of Asian pop culture like mechas and videogames. Several writers have posited points of departure for such a world but then have injected time splitters from the future. For instance James P. Hogan 's The Proteus Operation . Norman Spinrad wrote The Iron Dream in 1972, which is intended to be a science fiction novel written by Adolf Hitler after fleeing from Europe to North America in

13020-460: The Jews and Israel, Chabon also plays with other common tropes of alternate history fiction; in the book, Germany actually loses the war even harder than they did in reality, getting hit with a nuclear bomb instead of just simply losing a ground war (subverting the common "what if Germany won WWII?" trope). The late 1980s and the 1990s saw a boom in popular-fiction versions of alternate history, fueled by

13175-580: The MWI". Everett also argues that even if Deutsch's approach is correct, it would imply that any macroscopic object composed of multiple particles would be split apart when traveling back in time through a wormhole, with different particles emerging in different worlds. Certain experiments carried out give the impression of reversed causality , but fail to show it under closer examination. The delayed-choice quantum eraser experiment performed by Marlan Scully involves pairs of entangled photons that are divided into "signal photons" and "idler photons", with

13330-571: The Moors in Spain Had Won" and "If Louis XVI Had Had an Atom of Firmness". The essays range from serious scholarly efforts to Hendrik Willem van Loon 's fanciful and satiric portrayal of an independent 20th-century New Amsterdam , a Dutch city-state on the island of Manhattan . Among the authors included were Hilaire Belloc , André Maurois , and Winston Churchill . One of the entries in Squire's volume

13485-474: The Myriad Ways , where the reality of all possible universes leads to an epidemic of suicide and crime because people conclude their choices have no moral import. In any case, even if it is true that every possible outcome occurs in some world, it can still be argued that traits such as bravery and intelligence might still affect the relative frequency of worlds in which better or worse outcomes occurred (even if

13640-570: The Sleeper Awakes (1899) by H. G. Wells. Prolonged sleep is used as a means of time travel in these stories. The date of the earliest work about backwards time travel is uncertain. The Chinese novel A Supplement to the Journey to the West ( c.  1640 ) by Dong Yue features magical mirrors and jade gateways that connect various points in time. The protagonist Sun Wukong travels back in time to

13795-742: The Soviet Union. Gingrich and Forstchen neglected to write the promised sequel; instead, they wrote a trilogy about the American Civil War, starting with Gettysburg: A Novel of the Civil War , in which the Confederates win a victory at the Battle of Gettysburg - however, after Lincoln responds by bringing Grant and his forces to the eastern theater, the Army of Northern Virginia is soon trapped and destroyed in Maryland, and

13950-667: The Universal Monarchy: Napoleon and the Conquest of the World) (1836), which imagines Napoleon 's First French Empire emerging victorious in the French invasion of Russia in 1812 and in an invasion of England in 1814, later unifying the world under Bonaparte's rule. The Book of Mormon (published 1830) is described as an "alternative history" by Richard Lyman Bushman , a biographer of Joseph Smith . Smith claimed to have translated

14105-422: The absence of time travelers fails to prove time travel is physically impossible; it might be that time travel is physically possible but is never developed or is cautiously used. Carl Sagan once suggested the possibility that time travelers could be here but are disguising their existence or are not recognized as time travelers. Some versions of general relativity suggest that time travel might only be possible in

14260-399: The appearance of closed timelike curves." When a signal is sent from one location and received at another location, then as long as the signal is moving at the speed of light or slower, the mathematics of simultaneity in the theory of relativity show that all reference frames agree that the transmission-event happened before the reception-event. When the signal travels faster than light, it

14415-452: The authors did not alter the real history of the past when they wrote the stories. Similar to the genre of alternative history, there is also the genre of secret history - which can be either fictional or non-fictional - which documents events that might have occurred in history, but which had no effect upon the recorded historical outcome. Alternative history also is thematically related to, but distinct from, counterfactual history , which

14570-411: The case that backward time travel could be possible but that it would be impossible to actually change the past in any way, an idea similar to the proposed Novikov self-consistency principle in physics. According to the philosophical theory of compossibility , what can happen, for example in the context of time travel, must be weighed against the context of everything relating to the situation. If

14725-512: The causal future of the world line is also in its causal past, a situation that can be described as time travel. Such a solution was first proposed by Kurt Gödel , a solution known as the Gödel metric , but his (and others') solution requires the universe to have physical characteristics that it does not appear to have, such as rotation and lack of Hubble expansion . Whether general relativity forbids closed time-like curves for all realistic conditions

14880-481: The cause of a point of divergence (POD), which can denote either the bifurcation of a historical timeline or a simple replacement of the future that existed before the time-travelling event, has continued to be a popular theme. In Ward Moore 's Bring the Jubilee (1953), the protagonist lives in an alternate history in which the Confederacy has won the American Civil War. He travels backward through time and brings about

15035-435: The copies of you who made the same decision succeed too. What you do for the better increases the portion of the multiverse where good things happen." This view is perhaps somewhat too abstract to be explored directly in science fiction stories, but a few writers have tried, such as Greg Egan in his short story The Infinite Assassin , where an agent is trying to contain reality-scrambling "whirlpools" that form around users of

15190-706: The disintegration of the US Federal Government after Albert Gallatin joins the Whiskey Rebellion in 1794 and eventually leads to the creation of a libertarian utopia. In the 2022 novel Poutine and Gin by Steve Rhinelander, the point of divergence is the Battle of the Plains of Abraham of the French and Indian War. That novel is a mystery set in 1940 of that time line. A recent time traveling splitter variant involves entire communities being shifted elsewhere to become

15345-517: The document from golden plates, which told the story of a Jewish group who migrated from Israel to the Americas and inhabited the region from about 600 B.C. to 400 A.D., becoming the ancestors of Native Americans . In the 2005 biography Joseph Smith: Rough Stone Rolling , Bushman wrote that the Book of Mormon "turned American history upside down [and] works on the premise that a history—a book—can reconstitute

15500-473: The effects of acceleration and the effects of gravity as equivalent , and shows that time dilation also occurs in gravity wells , with a clock deeper in the well ticking more slowly; this effect is taken into account when calibrating the clocks on the satellites of the Global Positioning System , and it could lead to significant differences in rates of aging for observers at different distances from

15655-553: The emergence of the prolific alternate history author Harry Turtledove , as well as the development of the steampunk genre and two series of anthologies—the What Might Have Been series edited by Gregory Benford and the Alternate ... series edited by Mike Resnick . This period also saw alternate history works by S. M. Stirling , Kim Stanley Robinson, Harry Harrison , Howard Waldrop , Peter Tieryas , and others. In 1986,

15810-430: The famous and easy-to-replicate observation of atmospheric muon decay . The theory of relativity states that the speed of light is invariant for all observers in any frame of reference ; that is, it is always the same. Time dilation is a direct consequence of the invariance of the speed of light. Time dilation may be regarded in a limited sense as "time travel into the future": a person may use time dilation so that

15965-422: The film Somewhere in Time as an example of such an ontological paradox, where a watch is given to a person, and 60 years later the same watch is brought back in time and given to the same character. Ross states that entropy of the watch will increase, and the watch carried back in time will be more worn with each repetition of its history. The second law of thermodynamics is understood by modern physicists to be

16120-483: The first story to feature an alternate history created as a result of time travel. One of the first stories to feature time travel by means of a machine is " The Clock that Went Backward " by Edward Page Mitchell , which appeared in the New York Sun in 1881. However, the mechanism borders on fantasy. An unusual clock, when wound, runs backwards and transports people nearby back in time. The author does not explain

16275-518: The first that explicitly posited cross-time travel from one universe to another as anything more than a visionary experience) is H.G. Wells ' Men Like Gods (1923) in which the London -based journalist Mr. Barnstable, along with two cars and their passengers, is mysteriously teleported into "another world", which the "Earthlings" call Utopia. Being far more advanced than Earth, Utopia is some 3000 years ahead of humanity in its development. Wells describes

16430-471: The first time-machine story, but I'm not sure that a clock quite counts". H. G. Wells ' The Time Machine (1895) popularized the concept of time travel by mechanical means. Some theories, most notably special and general relativity , suggest that suitable geometries of spacetime or specific types of motion in space might allow time travel into the past and future if these geometries or motions were possible. In technical papers, physicists discuss

16585-535: The first to toy with the rich idea of time-travel in the form of an artifact sent backward from the future to be discovered in the present". In the science fiction anthology Far Boundaries (1951), editor August Derleth claims that an early short story about time travel is An Anachronism; or, Missing One's Coach , written for the Dublin Literary Magazine by an anonymous author in the June 1838 issue . While

16740-438: The framework of special relativity and general relativity . However, making one body advance or delay more than a few milliseconds compared to another body is not feasible with current technology. As for backward time travel, it is possible to find solutions in general relativity that allow for it, such as a rotating black hole . Traveling to an arbitrary point in spacetime has very limited support in theoretical physics , and

16895-491: The generations to follow him. Later that day, Honi sat down to rest but fell asleep for 70 years; when he awoke, he saw a man picking fruit from a fully mature carob tree. Asked whether he had planted it, the man replied that he had not, but that his grandfather had planted it for him. In Christian tradition, there is a similar, story of "the Seven Sleepers of Ephesus ", which recounts a group of early Christians who hid in

17050-402: The hero (another favorite theme of Dick's novels ). Strikingly, the characters in Ada seem to acknowledge their own world as the copy or negative version, calling it "Anti-Terra", while its mythical twin is the real "Terra". Like history, science has followed a divergent path on Anti-Terra: it boasts all the same technology as our world, but all based on water instead of electricity ; e.g., when

17205-432: The idea of absolute time , while his contemporary Gottfried Wilhelm Leibniz maintained that time is only a relation between events and it cannot be expressed independently. The latter approach eventually gave rise to the spacetime of relativity . Many philosophers have argued that relativity implies eternalism , the idea that the past and future exist in a real sense, not only as changes that occurred or will occur to

17360-643: The interacting- many-worlds interpretation . The non-scientific term 'timeline' is often used to refer to all physical events in history, so that where events are changed, the time traveler is described as creating a new timeline. Early science fiction stories feature characters who sleep for years and awaken in a changed society, or are transported to the past through supernatural means. Among them L'An 2440, rêve s'il en fût jamais ( The Year 2440: A Dream If Ever There Was One , 1770) by Louis-Sébastien Mercier , Rip Van Winkle (1819) by Washington Irving , Looking Backward (1888) by Edward Bellamy , and When

17515-411: The local laws of physics in a region of spacetime containing time travelers cannot be any different from the local laws of physics in any other region of spacetime. The philosopher Kelley L. Ross argues in "Time Travel Paradoxes" that in a scenario involving a physical object whose world-line or history forms a closed loop in time there can be a violation of the second law of thermodynamics . Ross uses

17670-664: The narrator waits under a tree for a coach to take him out of Newcastle upon Tyne , he is transported back in time over a thousand years. He encounters the Venerable Bede in a monastery and explains to him the developments of the coming centuries. However, the story never makes it clear whether these events are real or a dream. Another early work about time travel is The Forebears of Kalimeros: Alexander, son of Philip of Macedon by Alexander Veltman published in 1836. Charles Dickens 's A Christmas Carol (1843) has early depictions of mystical time travel in both directions, as

17825-416: The near future. With current technologies, it is only possible to cause a human traveler to age less than companions on Earth by a few milliseconds after a few hundred days of space travel. Philosophers have discussed the philosophy of space and time since at least the time of ancient Greece ; for example, Parmenides presented the view that time is an illusion. Centuries later, Isaac Newton supported

17980-399: The novel's anachronisms, the latter was not published until 1932. By contrast, the novel's timeline ends in 1871. Time travel Time travel is the hypothetical activity of traveling into the past or future . Time travel is a concept in philosophy and fiction , particularly science fiction . In fiction , time travel is typically achieved through the use of a device known as

18135-462: The null energy condition, and many physicists believe that the required negative energy may actually be possible due to the Casimir effect in quantum physics. Although early calculations suggested that a very large amount of negative energy would be required, later calculations showed that the amount of negative energy can be made arbitrarily small. In 1993, Matt Visser argued that the two mouths of

18290-410: The origin or properties of the clock. Enrique Gaspar y Rimbau 's El Anacronópete (1887) may have been the first story to feature a vessel engineered to travel through time. Andrew Sawyer has commented that the story "does seem to be the first literary description of a time machine noted so far", adding that "Edward Page Mitchell's story The Clock That Went Backward (1881) is usually described as

18445-407: The outside. One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine; in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backward in time. According to current theories on the nature of wormholes, construction of

18600-431: The past is a certain way, it's not possible for it to be any other way. What can happen when a time traveler visits the past is limited to what did happen, in order to prevent logical contradictions. The Novikov self-consistency principle , named after Igor Dmitrievich Novikov , states that any actions taken by a time traveler or by an object that travels back in time were part of history all along, and therefore it

18755-404: The past, conveying the political and religious conditions of the future. Because the narrator receives these letters from his guardian angel , Paul Alkon suggests in his book Origins of Futuristic Fiction that "the first time-traveler in English literature is a guardian angel". Madden does not explain how the angel obtains these documents, but Alkon asserts that Madden "deserves recognition as

18910-429: The people did not recognize him, nor did his household, except the maid, who was now an old blind woman. He prayed to God to cure her blindness and she could see again. He meets his son who recognized him by a mole between his shoulders and was older than he was. Time travel themes in science fiction and the media can be grouped into three categories: immutable timeline; mutable timeline; and alternate histories, as in

19065-460: The poets Robert Burns , Lord Byron , Percy Bysshe Shelley and John Keats , the actor Edmund Kean , the British politician George Canning , and Napoleon Bonaparte , are still alive. The first novel-length alternate history in English would seem to be Castello Holford 's Aristopia (1895). While not as nationalistic as Louis Geoffroy 's Napoléon et la conquête du monde, 1812–1823 , Aristopia

19220-485: The point of origin. Alternatively, another way is to take one entrance of the wormhole and move it to within the gravitational field of an object that has higher gravity than the other entrance, and then return it to a position near the other entrance. For both these methods, time dilation causes the end of the wormhole that has been moved to have aged less, or become "younger", than the stationary end as seen by an external observer; however, time connects differently through

19375-402: The point of view of an alternate history is variously known as " recursive alternate history ", a "double-blind what-if", or an "alternate-alternate history". Churchill's essay was one of the influences behind Ward Moore 's alternate history novel Bring the Jubilee in which General Robert E. Lee won the Battle of Gettysburg and paved the way for the eventual victory of the Confederacy in

19530-444: The possibility of closed timelike curves , which are world lines that form closed loops in spacetime, allowing objects to return to their own past. There are known to be solutions to the equations of general relativity that describe spacetimes which contain closed timelike curves, such as Gödel spacetime , but the physical plausibility of these solutions is uncertain. Many in the scientific community believe that backward time travel

19685-534: The possibility of generating a positive result demonstrating the existence of time travel, but have failed so far—no time travelers are known to have attended either event. Some versions of the many-worlds interpretation can be used to suggest that future humans have traveled back in time, but have traveled back to the meeting time and place in a parallel universe . There is a great deal of observable evidence for time dilation in special relativity and gravitational time dilation in general relativity, for example in

19840-544: The present time. Events such as Perth's Destination Day , MIT 's Time Traveler Convention and Stephen Hawking's Reception For Time Travellers heavily publicized permanent "advertisements" of a meeting time and place for future time travelers to meet. In 1982, a group in Baltimore , Maryland , identifying itself as the Krononauts, hosted an event of this type welcoming visitors from the future. These experiments only stood

19995-437: The present. Philosopher of science Dean Rickles disagrees with some qualifications, but notes that "the consensus among philosophers seems to be that special and general relativity are incompatible with presentism". Some philosophers view time as a dimension equal to spatial dimensions, that future events are "already there" in the same sense different places exist, and that there is no objective flow of time; however, this view

20150-463: The protagonist is transported to the prehistoric past by the magic of a "lame demon" (a French pun on Boitard's name), where he encounters a Plesiosaur and an apelike ancestor and is able to interact with ancient creatures. Edward Everett Hale 's "Hands Off" (1881) tells the story of an unnamed being, possibly the soul of a person who has recently died, who interferes with ancient Egyptian history by preventing Joseph 's enslavement. This may have been

20305-543: The protagonist's doppelganger. Philip K. Dick 's novel, The Man in the High Castle (1962), is an alternate history in which Nazi Germany and Imperial Japan won World War II. This book contains an example of "alternate-alternate" history, in that one of its characters authored a book depicting a reality in which the Allies won the war, itself divergent from real-world history in several aspects. The several characters live within

20460-428: The protagonist, Ebenezer Scrooge, is transported to Christmases past and future. Other stories employ the same template, where a character naturally goes to sleep, and upon waking up finds themself in a different time. A clearer example of backward time travel is found in the 1861 book Paris avant les hommes ( Paris before Men ) by the French botanist and geologist Pierre Boitard , published posthumously. In this story,

20615-493: The pure waves in the sum do so. This effect cannot be used to send any matter, energy, or information faster than light, so this experiment is understood not to violate causality either. The physicists Günter Nimtz and Alfons Stahlhofen, of the University of Koblenz , claim to have violated Einstein's theory of relativity by transmitting photons faster than the speed of light. They say they have conducted an experiment in which microwave photons traveled "instantaneously" between

20770-408: The ramifications of that alteration to history. Occasionally, some types of genre fiction are misidentified as alternative history , specifically science fiction stories set in a time that was the future for the writer, but now is the past for the reader, such as the novels 2001: A Space Odyssey (1968) by Arthur C. Clarke , 1984 (1949) by George Orwell and the movie 2012 (2009) because

20925-655: The real world, and constitutional monarchies, federations, colonies , and condominia are far more numerous. The history of Ill Bethisad, on the whole, often sees extinct or minority languages such as Catalan , Low Saxon , Crimean Gothic as well as others remaining more widely spoken in their respective regions than they have become in real-world history. Also, technologies that have either fallen out of favor or failed to develop in our world are explored and broadly used. For example, zeppelins and ekranoplans or ground-effect vehicles are still in use for both military and civil purposes. Computers are not highly developed, and there

21080-415: The reality that is most suitable for him or her. Some of the worlds they visit are mundane, some are very odd, and others follow science fiction or fantasy conventions. World War II produced alternate history for propaganda : both British and American authors wrote works depicting Nazi invasions of their respective countries as cautionary tales. The period around World War II also saw the publication of

21235-476: The same. In many cases, as with Spanish, English, or Japanese, the changes are relatively slight and mainly affect orthography or Romanizations. One example is the language of Galicia , which is called Ruthenian (rather than Ukrainian ) and is written with Polish orthography (rather than Cyrillic ; see Ukrainian Latin Alphabet for real-world examples). Others are more drastic; Ill Bethisad Croatian, for example,

21390-479: The signal photons emerging from one of two locations and their position later measured as in the double-slit experiment . Depending on how the idler photon is measured, the experimenter can either learn which of the two locations the signal photon emerged from or "erase" that information. Even though the signal photons can be measured before the choice has been made about the idler photons, the choice seems to retroactively determine whether or not an interference pattern

21545-453: The slaughter of the innocent thus entailed, remaining solely in the timeline where the country is saved. The cross-time theme was further developed in the 1960s by Keith Laumer in the first three volumes of his Imperium sequence, which would be completed in Zone Yellow (1990). Piper's politically more sophisticated variant was adopted and adapted by Michael Kurland and Jack Chalker in

21700-570: The task of writing the play that will motivate the Britons to rise up against their Spanish conquerors. He also co-authored a book with actor Richard Dreyfuss , The Two Georges , in which the United Kingdom retained the American colonies, with George Washington and King George III making peace. He did a two-volume series in which the Japanese not only bombed Pearl Harbor but also invaded and occupied

21855-457: The time traveler were to change anything; there is a contradiction if the past becomes different from the way it is . The paradox is commonly described with a person who travels to the past and kills their own grandfather, prevents the existence of their father or mother, and therefore their own existence. Philosophers question whether these paradoxes prove time travel impossible. Some philosophers answer these paradoxes by arguing that it might be

22010-528: The title "Master of Alternate History" by some. His books include those of Timeline 191 (a.k.a. Southern Victory, also known as TL-191), in which, while the Confederate States of America won the American Civil War , the Union and Imperial Germany defeat the Entente Powers in the two "Great War"s of the 1910s and 1940s (with a Nazi-esque Confederate government attempting to exterminate its black population), and

22165-505: The topic of this dispute. For they say: If, as you assert, God is omnipotent in all things, can he manage this, that things that have been made were not made? He can certainly destroy all things that have been made, so that they do not exist now. But it cannot be seen how he can bring it about that things that have been made were not made. To be sure, it can come about that from now on and hereafter Rome does not exist; for it can be destroyed. But no opinion can grasp how it can come about that it

22320-445: The total number of worlds with each type of outcome is infinite, it is still possible to assign a different measure to different infinite sets). The physicist David Deutsch , a strong advocate of the many-worlds interpretation of quantum mechanics, has argued along these lines, saying that "By making good choices, doing the right thing, we thicken the stack of universes in which versions of us live reasonable lives. When you succeed, all

22475-522: The unwitting creators of new time branches. These communities are transported from the present (or the near-future) to the past or to another timeline via a natural disaster, the action of technologically advanced aliens, or a human experiment gone wrong. S. M. Stirling wrote the Island in the Sea of Time trilogy, in which Nantucket Island and all its modern inhabitants are transported to Bronze Age times to become

22630-559: The war ends within weeks. While World War II has been a common point of divergence in alternate history literature, several works have been based on other points of divergence. For example, Martin Cruz Smith , in his first novel, posited an independent American Indian nation following the defeat of Custer in The Indians Won (1970). Beginning with The Probability Broach in 1980, L. Neil Smith wrote several novels that postulated

22785-480: The world's Jews instead live in a small strip of Alaska set aside by the US government for Jewish settlement. The story follows a Jewish detective solving a murder case in the Yiddish-speaking semi-autonomous city state of Sitka . Stylistically, Chabon borrows heavily from the noir and detective fiction genres, while exploring social issues related to Jewish history and culture. Apart from the alternate history of

22940-513: The world's first superpower. In Eric Flint 's 1632 series , a small town in West Virginia is transported to 17th century central Europe and drastically changes the course of the Thirty Years' War , which was then underway. John Birmingham 's Axis of Time trilogy deals with the culture shock when a United Nations naval task force from 2021 finds itself back in 1942 helping the Allies against

23095-514: The world, without people being aware of it. Poul Anderson 's Time Patrol stories feature conflicts between forces intent on changing history and the Patrol who work to preserve it. One story, Delenda Est , describes a world in which Carthage triumphed over the Roman Republic. The Big Time , by Fritz Leiber , describes a Change War ranging across all of history. Keith Laumer's Worlds of

23250-416: The wormhole than outside it, so that synchronized clocks at either end of the wormhole will always remain synchronized as seen by an observer passing through the wormhole, no matter how the two ends move around. This means that an observer entering the "younger" end would exit the "older" end at a time when it was the same age as the "younger" end, effectively going back in time as seen by an observer from

23405-451: The writer explicitly maintains that all possible decisions are made in all possible ways, one possible conclusion is that the characters were neither brave, nor clever, nor skilled, but simply lucky enough to happen on the universe in which they did not choose the cowardly route, take the stupid action, fumble the crucial activity, etc.; few writers focus on this idea, although it has been explored in stories such as Larry Niven 's story All

23560-487: The writer uses human decisions, every decision that could be made differently would result in a different timeline. A writer's fictional multiverse may, in fact, preclude some decisions as humanly impossible, as when, in Night Watch , Terry Pratchett depicts a character informing Vimes that while anything that can happen, has happened, nevertheless there is no history whatsoever in which Vimes has ever murdered his wife. When

23715-543: Was Churchill's "If Lee Had Not Won the Battle of Gettysburg", written from the viewpoint of a historian in a world in which the Confederacy had won the American Civil War . The entry considers what would have happened if the North had been victorious (in other words, a character from an alternate world imagines a world more like the real one we live in, although it is not identical in every detail). Speculative work that narrates from

23870-578: Was not founded long ago... One early work of fiction detailing an alternate history is Joanot Martorell 's 1490 epic romance Tirant lo Blanch , which was written when the fall of Constantinople to the Turks was still a recent and traumatic memory for Christian Europe . It tells the story of the knight Tirant the White from Brittany who travels to the embattled remnants of the Byzantine Empire . He becomes

24025-450: Was quickly followed by Murray Leinster 's " Sidewise in Time " (1934). While earlier alternate histories examined reasonably-straightforward divergences, Leinster attempted something completely different. In his "World gone mad", pieces of Earth traded places with their analogs from different timelines. The story follows Professor Minott and his students from a fictitious Robinson College as they wander through analogues of worlds that followed

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