Time travel in fiction

Last updated
Poster for the 1960 film adaptation of H. G. Wells' 1895 novella The Time Machine Poster for the 1960 film The Time Machine.jpg
Poster for the 1960 film adaptation of H. G. Wells' 1895 novella The Time Machine

Time travel is a common theme in fiction, mainly since the late 19th century, and has been depicted in a variety of media, such as literature, television, film, and advertisements. [1] [2]

The concept of time travel by mechanical means was popularized in H. G. Wells' 1895 story, The Time Machine . [3] [4] In general, time travel stories focus on the consequences of traveling into the past or the future. [3] [5] [6] The central premise for these stories often involves changing history, either intentionally or by accident, and the ways by which altering the past changes the future and creates an altered present or future for the time traveler upon their return home. [3] [6] In other instances, the premise is that the past cannot be changed or that the future is predetermined, and the protagonist's actions turn out to be either inconsequential or intrinsic to events as they originally unfolded. [7] Some stories focus solely on the paradoxes and alternate timelines that come with time travel, rather than time traveling itself. [5] They often provide some sort of social commentary, as time travel provides a "necessary distancing effect" that allows science fiction to address contemporary issues in metaphorical ways. [8]

Mechanisms

Time travel in modern fiction is sometimes achieved by space and time warps, stemming from the scientific theory of general relativity. [9] Stories from antiquity often featured time travel into the future through a time slip brought on by traveling or sleeping, [10] or in other cases, time travel into the past through supernatural means, for example brought on by angels or spirits. [4] [11]

Time slip

A time slip is a plot device in fantasy and science fiction in which a person, or group of people, seem to travel through time by unknown means. [12] [13] The idea of a time slip has been used in 19th century fantasy, an early example being Washington Irving's 1819 Rip Van Winkle , where the mechanism of time travel is an extraordinarily long sleep. [14] Mark Twain's 1889 A Connecticut Yankee in King Arthur's Court had considerable influence on later writers. [15] The first novel to include both travel to the past and travel to the future and return to the present is the Charles Dickens 1843 novel A Christmas Carol .[ citation needed ]

Time slip is one of the main plot devices of time travel stories, another being a time machine. The difference is that in time slip stories, the protagonist typically has no control and no understanding of the process (which is often never explained at all) and is either left marooned in a past or future time and must make the best of it, or is eventually returned by a process as unpredictable and uncontrolled as the journey out. [16] The plot device is also popular in children's literature. [17] [18] The 2011 film, Midnight in Paris similarly presents time travel as occurring without an explained mechanism, as the director "eschews a 'realist' internal logic that might explain the time travel, while also foregoing experimental time Distortion techniques, in favor of straightforward editing and a fantastical narrative set-up". [19]

Communication from the future

In literature, communication from the future is a plot device in some science fiction and fantasy stories. Forrest J. Ackerman noted in his 1973 anthology of the best fiction of the year that "the theme of getting hold of tomorrow's newspaper is a recurrent one". [20] An early example of this device can be found in H.G. Wells's 1932 short story "The Queer Story of Brownlow's Newspaper", [20] [21] which tells the tale of a man who receives such a paper from 40 years in the future. The 1944 film It Happened Tomorrow also employs this device, [20] with the protagonist receiving the next day's newspaper from an elderly colleague (who is possibly a ghost). Ackerman's anthology also highlights a 1972 short story by Robert Silverberg, "What We Learned From This Morning's Newspaper". [20] In that story, a block of homeowners wake to discover that on November 22, they have received The New York Times for the coming December 1. [1] :38 As characters learn of future events affecting them through a newspaper delivered a week early, the ultimate effect is that this "so upsets the future that spacetime is destroyed". [1] :165 The television series Early Edition , similar to the film It Happened Tomorrow, [22] also revolved around a character who daily received the next day's newspaper, [1] :235 and sought to change some event therein forecast to happen.

A newspaper from the future can be a fictional edition of a real newspaper, or an entirely fictional newspaper. John Buchan's 1932 novel The Gap in the Curtain , is similarly premised on a group of people being enabled to see, for a moment, an item in The Times newspaper from one year in the future. During the Swedish general election of 2006, the Swedish liberal party used election posters which looked like news items, called Framtidens nyheter ("News of the future"), featuring a future Sweden that had become what the party wanted. [23]

A communication from the future raises questions about the ability of humans to control their destiny. [1] :165 The visual novel Steins;Gate features characters sending short text messages backwards in time to avert disaster, only to find their problems are exacerbated due to not knowing how individuals in the past will actually utilize the information. [24] [25] [26]

Precognition

Precognition has been explored as a form of time travel in fiction. Author J. B. Priestley wrote of it both in fiction and non-fiction, analysing testimonials of precognition and other "temporal anomalies" in his book Man and Time. His books include time travel to the future through dreaming, which upon waking up results in memories from the future. Such memories, he writes, may also lead to the feeling of déjà vu , that the present events have already been experienced, and are now being re-experienced. [27] Infallible precognition, which describes the future as it truly is, may lead to causal loops, one form of which is explored in Newcomb's paradox. [28] [29] The film 12 Monkeys heavily deals with themes of predestination and the Cassandra complex, where the protagonist who travels back in time explains that he can't change the past. [30]

The protagonist of the short story Story of Your Life experiences life as a superimposition of the present and the totality of her life, future included, as a consequence of learning an alien language. The mental faculty is speculation based on the Sapir–Whorf hypothesis.[ citation needed ]

Time loop

A "time loop" or "temporal loop" is a plot device in which periods of time are repeated and re-experienced by the characters, and there is often some hope of breaking out of the cycle of repetition. [31] Time loops are sometimes referred to as causal loops, [30] [31] but these two concepts are distinct. Although similar, causal loops are unchanging and self-originating, whereas time loops are constantly resetting. In a time loop when a certain condition is met, such as a death of a character or a clock reaching a certain time, the loop starts again, with one or more characters retaining the memories from the previous loop. [32] Stories with time loops commonly center on the character learning from each successive loop through time. [31]

Experiencing time in reverse

In some media, certain characters are presented as moving through time backwards. This is a very old concept, with some accounts asserting that English mythological figure Merlin lived backwards, and appeared to be able to prophesy the future because for him it was a memory. This tradition has been reflected in certain modern fictional accounts of the character. [33] In the Piers Anthony book Bearing an Hourglass , the second of eight books in the Incarnations of Immortality series, the character of Norton becomes the incarnation of Time and continues his life living backwards in time. [34] The 2016 film Doctor Strange has the character use the Time Stone, one of the Infinity Stones in the Marvel Cinematic Universe, to reverse time, experiencing time backwards while so doing. [35] [ page needed ]

In the film Tenet , characters time travel without jumping back, but by experiencing past reality in reverse, and at the same speed, after going through a 'turnstile' device and until they revert back to normal time flow by going through such a device again. [36] In the meantime, two versions of the time traveller coexist (and must not meet, lest they mutually destruct): the one that had been 'traveling forward' (existing normally) until entering a turnstile and the one traveling backward from the turnstile.[ citation needed ] The laws of thermodynamics are reversed for time traveling people and objects, so that for example backward travel requires the use of a respirator. Objects left behind by time travellers obey 'reverse thermodynamics;' for example, bullets shot or even simply deposited while traveling backward fly back into (forward traveling) guns.[ citation needed ]

Record

Protagonists do not travel in time but perceive other times through a record. Depending on the technology, they can minimally consult the record or maximally interact with it as a simulated reality that can deviate causally from the original timeline from the point of interaction. A record can be consulted multiple times, thus providing a time loop mechanism.[ citation needed ]

Philip K. Dick's novel The Man in the High Castle features books reporting on an alternate timeline. The TV series transposes the mechanism of the books to newsreels. Incidentally, the alternate timeline is the historic timeline, as opposed to the alternate history of the works, so that the records also function as meta-references to the timeline experienced by the authors and the consumers of the works.[ citation needed ]

The plot of the film Source Code features a simulated and time-looped reality based on the memories of a dead man.[ citation needed ]

Themes

Time paradox

The idea of changing the past is logically contradictory, creating situations like the grandfather paradox, where time travellers go back in time and change the past in a way that affects their own future, such as by killing their own grandparents. [37] [38] The engineer Paul J. Nahin states that "even though the consensus today is that the past cannot be changed, science fiction writers have used the idea of changing the past for good story effect". [1] :267 Time travel to the past and precognition without the ability to change events may result in causal loops. [30]

The possibility of characters inadvertently or intentionally changing the past gave rise to the idea of "time police", people tasked with preventing such changes from occurring by themselves engaging in time travel to rectify such changes. [39]

Alternative future, history, timelines, and dimensions

An alternative future or alternate future is a possible future that never comes to pass, typically when someone travels back into the past and alters it so that the events of the alternative future cannot occur, [40] or when a communication from the future to the past effected a change that alters the future. [1] :165 Alternative histories may exist "side by side", with the time traveller actually arriving at different dimensions as he changes time. [41]

Butterfly effect

The butterfly effect is the notion that small events can have large, widespread consequences. The term describes events observed in chaos theory where a very small change in initial conditions results in vastly different outcomes. The term was coined by mathematician Edward Lorenz years after the phenomenon was first described. [42]

The butterfly effect has found its way into popular imagination. For example, in Ray Bradbury's 1952 short story A Sound of Thunder , the killing of a single insect millions of years in the past drastically changes the world, and in the 2004 film The Butterfly Effect , the protagonist's small changes to his past results in extreme changes. [43]

Time tourism

A "distinct subgenre" of stories explore time travel as a means of tourism, [4] with travelers curious to visit periods or events such as the Victorian Era or the Crucifixion of Christ, or to meet historical figures such as Abraham Lincoln or Ludwig van Beethoven. [39] This theme can be addressed from two or three directions. An early example of present-day tourists travelling back to the past is Ray Bradbury's 1952 A Sound of Thunder , in which the protagonists are big game hunters who travel to the distant past to hunt dinosaurs. [4] An early example of another type, in which tourists from the future visit the present, is Catherine L. Moore and Henry Kuttner's 1946 Vintage Season . [44] The final type in which there are people time-traveling to the future is experienced in the second book of Douglas Adams' The Hitchhiker's Guide to the Galaxy series, The Restaurant at the End of the Universe , which, as the title indicates, includes a restaurant that exists at the end of the universe. In the restaurant, people time-traveling from all over the space-time continuum (especially the rich) came to the restaurant to view the explosion of the universe put on repeat.[ citation needed ]

Time war

The Encyclopedia of Science Fiction describes a time war as a fictional war that is "fought across time, usually with each side knowingly using time travel ... in an attempt to establish the ascendancy of one or another version of history". Time wars are also known as "change wars" and "temporal wars". [45] Examples include Clifford D. Simak's 1951 Time and Again , Russell T Davies' 2005 revival of Doctor Who, [46] Barrington J. Bayley's 1974 The Fall of Chronopolis , and Matthew Costello's 1990 Time of the Fox. [1] :267

Ghost story

Researcher Barbara Bronlow wrote that traditional ghost stories are in effect an early form of time travel, since they depict living people of the present interacting with (dead) people of the past. She noted as an instance that Christopher Marlow's Doctor Faustus called up Helen of Troy and met her arising from her grave. [47]

See also

Related Research Articles

<span class="mw-page-title-main">Time travel</span> Hypothetical travel into the past or future

Time travel is the hypothetical activity of traveling into the past or future. Time travel is a widely recognized concept in philosophy and fiction, particularly science fiction. In fiction, time travel is typically achieved through the use of a hypothetical device known as a time machine. The idea of a time machine was popularized by H. G. Wells's 1895 novel The Time Machine.

The Novikov self-consistency principle, also known as the Novikov self-consistency conjecture and Larry Niven's law of conservation of history, is a principle developed by Russian physicist Igor Dmitriyevich Novikov in the mid-1980s. Novikov intended it to solve the problem of paradoxes in time travel, which is theoretically permitted in certain solutions of general relativity that contain what are known as closed timelike curves. The principle asserts that if an event exists that would cause a paradox or any "change" to the past whatsoever, then the probability of that event is zero. It would thus be impossible to create time paradoxes.

<i>The End of Eternity</i> 1955 science fiction novel by Isaac Asimov

The End of Eternity is a 1955 science fiction novel by Isaac Asimov with mystery and thriller elements on the subjects of time travel and social engineering. Its ultimate premise is that of a causal loop, a type of temporal paradox in which events and their causes form a loop.

<span class="mw-page-title-main">Science fiction film</span> Film genre

Science fiction is a film genre that uses speculative, fictional science-based depictions of phenomena that are not fully accepted by mainstream science, such as extraterrestrial lifeforms, spacecraft, robots, cyborgs, mutants, interstellar travel, time travel, or other technologies. Science fiction films have often been used to focus on political or social issues, and to explore philosophical issues like the human condition.

<span class="mw-page-title-main">Retrofuturism</span> Creative arts movement inspired by historic depictions of the future

Retrofuturism is a movement in the creative arts showing the influence of depictions of the future produced in an earlier era. If futurism is sometimes called a "science" bent on anticipating what will come, retrofuturism is the remembering of that anticipation. Characterized by a blend of old-fashioned "retro styles" with futuristic technology, retrofuturism explores the themes of tension between past and future, and between the alienating and empowering effects of technology. Primarily reflected in artistic creations and modified technologies that realize the imagined artifacts of its parallel reality, retrofuturism can be seen as "an animating perspective on the world".

The time loop or temporal loop is a plot device in fiction whereby characters re-experience a span of time which is repeated, sometimes more than once, with some hope of breaking out of the cycle of repetition. The term "time loop" is sometimes used to refer to a causal loop; however, causal loops are unchanging and self-originating, whereas time loops are constantly resetting: when a certain condition is met, such as a death of a character or a clock reaching a certain time, the loop starts again, possibly with one or more characters retaining the memories from the previous loop.

A Tipler cylinder, also called a Tipler time machine, is a hypothetical object theorized to be a potential mode of time travel—although results have shown that a Tipler cylinder could only allow time travel if its length were infinite or with the existence of negative energy.

A plot twist is a literary technique that introduces a radical change in the direction or expected outcome of the plot in a work of fiction. When it happens near the end of a story, it is known as a twist ending or surprise ending. It may change the audience's perception of the preceding events, or introduce a new conflict that places it in a different context. A plot twist may be foreshadowed, to prepare the audience to accept it, but it usually comes with some element of surprise. There are various methods used to execute a plot twist, such as withholding information from the audience, or misleading them with ambiguous or false information. Not every plot has a twist, but some have multiple lesser ones, and some are defined by a single major twist.

A temporal paradox, time paradox, or time travel paradox, is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time travel or other foreknowledge of the future. While the notion of time travel to the future complies with the current understanding of physics via relativistic time dilation, temporal paradoxes arise from circumstances involving hypothetical time travel to the past – and are often used to demonstrate its impossibility.

The timestream or time stream is a metaphorical conception of time as a stream, a flowing body of water. In Brave New Words: The Oxford Dictionary of Science Fiction, the term is more narrowly defined as: "the series of all events from past to future, especially when conceived of as one of many such series". Timestream is the normal passage or flow of time and its historical developments, within a given dimension of reality. The concept of the time stream, and the ability to travel within and around it, are the fundamentals of a genre of science fiction.

<span class="mw-page-title-main">Suspense</span> State of mental uncertainty

Suspense is a state of anxiety or excitement caused by mysteriousness, uncertainty, doubt, or undecidedness. In a narrative work, suspense is the audience's excited anticipation about the plot or conflict, particularly as it affects a character for whom the audience feels sympathy. However, suspense is not exclusive to narratives.

In science fiction, a time viewer, temporal viewer, or chronoscope is a device that allows another point in time to be observed. The concept has appeared since the late 19th century, constituting a significant yet relatively obscure subgenre of time travel fiction and appearing in various media including literature, cinema, and television. Stories usually explain the technology by referencing cutting-edge science, though sometimes invoking the supernatural instead. Most commonly only the past can be observed, though occasionally time viewers capable of showing the future appear; these devices are sometimes limited in terms of what information about the future can be obtained. Other variations on the concept include being able to listen to the past but not view it.

<span class="mw-page-title-main">Tachyons in fiction</span> Hypothetical particle

The hypothetical particles tachyons, defined through being faster than light, have inspired many occurrences in fiction. In general, tachyons are a standby mechanism upon which many science fiction authors rely to establish faster-than-light communication, with or without reference to causality issues, as well as a means to achieve faster-than-light travel. Science writer Sidney Perkowitz commented "that the very word "tachyon," because of its unusual Greek-origin spelling and engagingly catchy hard "ch" sound, lends a certain "science-ness" or "science coolness to fiction." Starting in the 1970s, tachyons were used in science-fiction to present a seemingly-plausible explanation for time travel and communication through time. Peter Nicholls, in The Encyclopedia of Science Fiction, describes Gregory Benford's Timescape (1980) as the first work to use tachyons to this effect "with some care", where scientists send a message to the past trying to change history. Glen Cook's 1985 novel A Matter of Time features a much less stringently described "tachyon generator" to "transmit [both to the past and] to the far future". Uses of the concept for space travel appeared in association with "the Asgard, the benevolent alien race in the Stargate SG-1 television series (1997–2007)", and in the 2001 film K-Pax, which coined the term "tachyonic speeds" for "multiples of light speed". An "unabashed" use appeared already in 1969, where "Bob Shaw's The Palace of Eternity features such delights as a million-ton tachyonic spaceship travelling at 30,000 times the speed of light." In the Star Trek franchise, in addition to facilitating faster-than-light travel, tachyons have been mentioned "for varied purposes, including cloaking a spacecraft, detection" of such cloaking and overcoming defensive shields, which has been regarded as "technobabble" by Mashable contributor Keith Wagstaff: dialogue that implies a scientific explanation, using a term with a real scientific concept behind it, "but really doesn't mean much."

Retrocausality, or backwards causation, is a concept of cause and effect in which an effect precedes its cause in time and so a later event affects an earlier one. In quantum physics, the distinction between cause and effect is not made at the most fundamental level and so time-symmetric systems can be viewed as causal or retrocausal. Philosophical considerations of time travel often address the same issues as retrocausality, as do treatments of the subject in fiction, but the two phenomena are distinct.

The idea of a fourth dimension has been a factor in the evolution of modern art, but use of concepts relating to higher dimensions has been little discussed by academics in the literary world. From the late 19th century onwards, many writers began to make use of possibilities opened up by the exploration of such concepts as hypercube geometry. While many writers took the fourth dimension to be one of time, others preferred to think of it in spatial terms, and some associated the new mathematics with wider changes in modern culture.

"The Clock That Went Backward" is a fantasy short story by American writer Edward Page Mitchell.

<span class="mw-page-title-main">Time slip</span> Plot device in fiction where a character changes time periods

A time slip is a plot device in fantasy and science fiction in which a person, or group of people, seem to accidentally travel through time by unknown means, or by a means unknown to the character(s).

<span class="mw-page-title-main">Killing baby Hitler</span> Ethical and physical thought experiment

Killing baby Hitler is a thought experiment in ethics and theoretical physics which poses the question of using time travel to assassinate an infant Adolf Hitler. It presents an ethical dilemma in both the action and its consequences, as well as a temporal paradox in the logical consistency of time. Killing baby Hitler first became a literary trope of science fiction during World War II and has since been used to explore these ethical and metaphysical debates.

References

  1. 1 2 3 4 5 6 7 8 Nahin, Paul J. (1999). Time Machines: Time Travel in Physics, Metaphysics, and Science Fiction (2nd ed.). New York: Springer. ISBN   978-0-387985718.
  2. Nahin, Paul J. (2011). Time Travel: A Writer's Guide to the Real Science of Plausible Time Travel. Baltimore: Johns Hopkins University Press. p. ix. ISBN   9781421401201.
  3. 1 2 3 Sterling, Bruce (3 May 2016). "Science fiction - Time travel". Encyclopædia Britannica. Retrieved 28 December 2017.
  4. 1 2 3 4 Kuiper, Kathleen (2012). Prose: Literary Terms and Concepts (1st ed.). New York: Encyclopædia Britannica, Inc. pp. 63–64. ISBN   9781615304943.
  5. 1 2 Sterling, Bruce (3 May 2016). "Science fiction - Time travel". Encyclopædia Britannica. Retrieved 28 December 2017.
  6. 1 2 Flood, Alison (23 September 2011). "Time travel in fiction: why authors return to it time and time again". The Guardian . Retrieved 29 November 2015.
  7. charliejane (31 January 2008). "Can You Escape Your Fate? Science Fiction Has The Answer!". io9 . Retrieved 22 February 2020.
  8. Redmond, Sean (2014). Liquid Metal: the Science Fiction Film Reader. New York: Columbia University Press. p. 114. ISBN   978-0-231501842 . Retrieved 30 September 2015. [...] the time travel motif also has an ideological function because it literally provides the necessary distancing effect that science fiction needs to be able to metaphorically address the most pressing issues and themes that concern people in the present.
  9. Stephen Hawking (1999). "Space and Time Warps" . Retrieved 20 February 2016.
  10. Fitting, Peter (2010). "Utopia, Dystopia, and Science Fiction". The Cambridge Companion to Utopian Literature. Cambridge: Cambridge University Press. pp. 138–139. ISBN   978-0-521-88665-9.
  11. Alkon, Paul K. (1987). Origins of Futuristic Fiction. Athens: University of Georgia Press. pp.  95–96. ISBN   978-0-820309323.
  12. Anders, Charlie Jane (12 June 2009). "Timeslip romance". io9. Retrieved 27 August 2015.
  13. Palmer, Christopher (2007). Philip K. Dick: Exhilaration and Terror of the Postmodern (Reprint ed.). Liverpool: Liverpool University Press. p. 146. ISBN   978-0-853236184 . Retrieved 11 February 2017.
  14. Lee, Maggie (12 April 2016). "Film Review: 'A Bride for Rip Van Winkle'". Variety . Retrieved 30 April 2021.
  15. James, Edward; Mendlesohn, Farah (2002). The Cambridge Companion to Fantasy Literature. Cambridge: Cambridge University Press. p. 106. ISBN   9781107493735 . Retrieved 11 February 2017.
  16. Schweitzer, Darrell (2009). The Fantastic Horizon: Essays and Reviews (1st ed.). Rockville, Maryland: Borgo Press. p. 112. ISBN   9781434403209 . Retrieved 22 September 2017.
  17. Lucas, Ann Lawson (2003). The Presence of the Past in Children's Literature. Westport, Connecticut: Praeger. p. 113. ISBN   978-0-313324833.
  18. Cosslett, Tess (1 April 2002). ""History from Below": Time-Slip Narratives and National Identity". The Lion and the Unicorn. 26 (2): 243–253. doi:10.1353/uni.2002.0017. ISSN   1080-6563. S2CID   145407419 . Retrieved 22 September 2017.
  19. Jones, Matthew; Ormrod, Joan (2015). Time Travel in Popular Media:Essays on Film, Television, Literature and Video Games. Jefferson, North Carolina: McFarland. p. 278. ISBN   9781476620084.
  20. 1 2 3 4 Ackerman, Forrest J. (1973). Best Science Fiction for 1973. Ace Books. p. 36.
  21. "The Queer Story of Brownlow's Newspaper". Gutenberg.net.au. 10 November 1971. Retrieved 24 December 2015.
  22. Young, R. G. (1997). The Encyclopedia of Fantastic Film: Ali Baba to Zombies. New York: Applause. p. 318. ISBN   978-1-55783-269-6.
  23. Jonsson, Gunnar (29 June 2006). "Fp [Folkpartiet] satsar på löpsedlar som valaffischer" [FP [The People's Party] focuses on headlines as election posters]. Dagens Nyheter (in Swedish). Retrieved 9 September 2015.
  24. 秋葉原に時間の扉が開かれる 『シュタインズ・ゲート』 [The gate of time can be opened at Akihabara, "Steins;Gate"] (in Japanese). Famitsu. 13 June 2009. Archived from the original on 21 October 2012. Retrieved 1 November 2009.
  25. Ishii, Senji (15 October 2009). 時間という禁断のテーマに挑んだ本格派ノベルゲーム『シュタインズ・ゲート』インプレッション [Impressions of "Steins;Gate", a novel game about the forbidden topic of time] (in Japanese). Famitsu. Archived from the original on 13 November 2009. Retrieved 7 November 2009.
  26. "Steins;Gate". Famitsu (in Japanese). Enterbrain. June 2009. p. 231.
  27. Price, Katy (December 2014). "Testimonies of precognition and encounters with psychiatry in letters to J. B. Priestley". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. 48: 103–111. doi: 10.1016/j.shpsc.2014.07.006 . PMID   25176614.
  28. Craig, William Lane (October 1987). "Divine Foreknowledge and Newcomb's Paradox". Philosophia. 17 (3): 331–350. doi:10.1007/BF02455055. S2CID   143485859 . Retrieved 11 February 2017.
  29. Dummett, Michael (1993). The Seas of Language (1st ed.). Oxford: Clarendon Press. pp. 356, 370–375. ISBN   978-0-198240112.
  30. 1 2 3 Klosterman, Chuck (2009). Eating the Dinosaur (1st ed.). New York: Scribner. pp.  60–62. ISBN   9781439168486.
  31. 1 2 3 Chelsea Quinn Yarbro. "Time Loop". The Encyclopedia of Science Fiction . Retrieved 2015-10-18.
  32. Jones, Matthew; Ormrod, Joan (2015). Time Travel in Popular Media: Essays on Film, Television, Literature and Video Games. McFarland & Company. p. 207. ISBN   978-0-786478071.
  33. Goodrich, Peter H. (2003). Merlin: A Casebook. New York: Routledge. pp. 83, 247. ISBN   1135583404.
  34. Amazing Science Fiction Stories. 58: 15. 1984.{{cite journal}}: Missing or empty |title= (help)[ title missing ]
  35. Johnston, Jacob (22 November 2016). Marvel's Doctor Strange: The Art of the Movie. New York. ISBN   978-0785198208.{{cite book}}: CS1 maint: location missing publisher (link)
  36. Stolworthy, Jacob (27 August 2020). "The crucial Tenet scene that reveals true meaning of movie's title" . The Independent . Archived from the original on 2022-05-07. Retrieved 26 August 2021.
  37. Langford, David. "Time Paradoxes". The Encyclopedia of Science Fiction. Retrieved 30 November 2015.
  38. Swartz, Norman (October 31, 1993). "Time Travel: Visiting the Past". Norman Swartz - Biography. Simon Fraser University . Retrieved February 20, 2016.
  39. 1 2 Stableford, Brian (2006). Science Fact and Science Fiction: An Encyclopedia . New York: Routledge. p.  534. ISBN   0415974607.
  40. Prucher, Jeffrey; Wolfe, Gene (2007). "alternate future". Brave New Words: The Oxford Dictionary of Science Fiction . New York: Oxford University Press. pp. 4–5. ISBN   978-0-195305678 . Retrieved 4 January 2016.
  41. "Journeys in Space and Time". Cosmos: A Personal Voyage . Episode 8. November 16, 1980. Event occurs at 36 minute mark. PBS.
  42. Hilborn, Robert C. (April 2004). "Sea gulls, butterflies, and grasshoppers: A brief history of the butterfly effect in nonlinear dynamics". American Journal of Physics . 72 (4): 425–427. Bibcode:2004AmJPh..72..425H. doi:10.1119/1.1636492.
  43. Peter Dizikes (June 8, 2008). "The meaning of the butterfly". Boston Globe. Retrieved May 31, 2016.
  44. Bova, Ben (2003). "Introduction". The Science Fiction Hall of Fame, Volume Two (1st ed.). New York: Tor Books. pp.  ix-xi. ISBN   978-0-765305343.
  45. Langford, David. "Changewar". The Encyclopedia of Science Fiction. Retrieved November 17, 2015.
  46. Martin, Dan (2013-11-25). "Doctor Who recap: The Day of the Doctor". The Guardian. ISSN   0261-3077 . Retrieved 2024-04-15.
  47. Bronlow, Barbara H. Petrovna, Natalia; Cougland, George C.; Ramirez, Juan Mario (eds.). Workshop on the Ongoing Impact of Ancient Myth on Contemporary Culture: 146–148.{{cite journal}}: Missing or empty |title= (help)

Further reading