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Ansible

Fictional machine capable of faster-than-light communication From Wikipedia, the free encyclopedia

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The term ansible refers to a category of fictional technological devices capable of superluminal or faster-than-light (FTL) communication. These devices can instantaneously transmit and receive communicative and informational data streams across vast distances and obstacles, including between star systems and even across galaxies. As a name for such a device, the term ansible first appeared in a 1966 novel by Ursula K. Le Guin. Since that time, the broad use of the term has continued in the works of numerous science-fiction authors, across a variety of settings and continuities.[1] Related terms are ultraphone and ultrawave.[2][3]

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Coinage by Ursula Le Guin

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Ursula K. Le Guin first used the word ansible in her 1966 novel Rocannon's World.[1][4] Etymologically, the word was a contraction of answerable, reflecting the device's ability to deliver responses to their messages in a reasonable amount of time, even over interstellar distances.[5]

The ansible was the basis for creating a specific kind of interstellar civilization, where communications between far-flung stars are instantaneous, but humans can only travel at relativistic speeds. Under these conditions, a full-fledged galactic empire is not possible, but there is a looser interstellar organization, in which several of Le Guin's protagonists are involved.[6]

Although Le Guin invented the name ansible for this type of device (further developing its details in her fictional works), the broader concept of instantaneous superluminal or FTL communication had previously existed in science fiction.[citation needed] Similar communication functions were included in a device called an "interocitor" in the 1952 novel This Island Earth by Raymond F. Jones, and the 1955 film based on the novel. Similarly in 1954, another of these devices called the "Dirac Communicator" appeared in James Blish's short story Beep, which was expanded into the 1974 novel The Quincunx of Time.[7] Additionally, Robert A. Heinlein, in his 1958 novel Time for the Stars, employed instantaneous telepathic communication between identical twin pairs over interstellar distances, and like Le Guin, provided a technical explanation based on a non-Einsteinian principle of simultaneity.[citation needed]

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In Le Guin's works

In her subsequent works, Le Guin continued to develop the concept of the ansible:

  • In The Left Hand of Darkness (1969), Le Guin writes that the ansible "doesn't involve radio waves, or any form of energy. The principle it works on, the constant of simultaneity, is analogous in some ways to gravity ... One point has to be fixed, on a planet of certain mass, but the other end is portable."
  • In The Word for World Is Forest (1972), Le Guin explains that in order for communication to work with any pair of ansibles, at least one "must be on a large-mass body, the other can be anywhere in the cosmos".
  • In The Dispossessed (1974), Le Guin tells of the development of the theory leading up to the ansible.[8]

Any ansible may be used to communicate through any other, by setting its coordinates to those of the receiving ansible.[citation needed] They have a limited bandwidth, which only allows for at most a few hundred characters of text to be communicated in any transaction of a dialog session, and are attached to a keyboard and small display to perform text messaging.[citation needed]

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Use by later authors

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Since Le Guin's conception of the ansible, the name of the device has been borrowed by numerous authors. While Le Guin's ansible was said to communicate "instantaneously",[8] the name has also been adopted for devices capable of communication at finite speeds that are faster than light.[who?] David Langford publishes the science fiction fanzine and newsletter Ansible.[relevant?][citation needed]

Orson Scott Card's works

American author Orson Scott Card in his Ender's Game novels used the term "ansible" as an unofficial name for the "Philotic Parallax Instantaneous Communicator" device, which transmits information across infinite distances with no time delay.[9] In the first Ender's Game novel (1985), Colonel Graff states that "somebody dredged the name ansible out of an old book somewhere".[9] In an answer on the question-and-answer website Quora, Card explained why he chose to appropriate LeGuin's term "ansible" instead of developing a new in-universe name for one:

In a FTL universe, you have several levels. [If you] can travel hyperfast, but no radio signal can outstrip [outrun] your ship, [then] you have to carry the mail with you. It's like the way things were between Europe and America before the laying of the successful transatlantic cable. But once it was laid, messages could be sent long before a ship could make the passage. That is like the ansible universe in Ursula K. LeGuin's early Hainish novels. Since I needed to use exactly that rule set, why not use the word – an excellent word – which I apply in the same way we all say 'robot,' an invented word that has entered the language, [and thereby] pay tribute to the writer from whose works I learned the word.[10]

Card's ansible in the Ender's Game universe works via fictional subatomic particles called philotes.[11] The two quarks inside a pi meson can be separated by an arbitrary distance, while remaining connected by "philotic rays".[11] Card's version of the ansible also features in the video game Advent Rising, which he helped write the story for.[12]

Other writers

Numerous other writers have included ansibles and similar FTL communication devices in their fictional works. Notable examples include:

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See also

References

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Further reading

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