History Main / SubSpaceAnsible

27th Sep '16 9:04:52 PM PaulA
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* Averted in Creator/CJCherryh's Literature/AllianceUnion and Literature/ChanurSaga series. Communications between star systems can only be done via FTL courier, and FTL travel is only possible between the outside edges of star systems. When a space ship arrives at the edge of a system and travels inwards it takes a long time for light-speed messages to reach the inner system (or vice-versa), with the time shortening as the ship hurtles forward at a considerable fraction of the speed of light.

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* Averted in Creator/CJCherryh's Literature/AllianceUnion and Literature/ChanurSaga series.'verse (including the Literature/ChanurNovels). Communications between star systems can only be done via FTL courier, and FTL travel is only possible between the outside edges of star systems. When a space ship arrives at the edge of a system and travels inwards it takes a long time for light-speed messages to reach the inner system (or vice-versa), with the time shortening as the ship hurtles forward at a considerable fraction of the speed of light.
22nd Sep '16 9:28:15 PM FordPrefect
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** One solution to TheLongitudeProblem, which similarly involved trying to transmit information (Greenwich Mean Time) over vast distances (the ocean) beyond the scope of modern technology (handwritten letters) was to keep a wounded dog in a cage on a sailing ship. A person in London would dip its bloodied bandage into what was called "[[SympatheticMagic the powder of sympathy]]" at a prearranged time, whereupon the dog would yelp at the same instant. In case it wasn't blindingly obvious, this theory never caught on with the scientific community.

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** One solution to TheLongitudeProblem, which similarly involved trying to transmit information (Greenwich Mean Time) over vast distances (the ocean) beyond the scope of modern technology (handwritten letters) letters), was to keep a wounded dog in a cage on a sailing ship. A person in London would dip its bloodied bandage into what was called "[[SympatheticMagic the powder of sympathy]]" at a prearranged time, whereupon the dog would yelp at the same instant. In case it wasn't blindingly obvious, this theory never caught on with the scientific community.
15th Sep '16 1:17:48 AM PaulA
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-->-- '''The Burning Bridge''' by Poul Anderson.

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-->-- '''The Burning Bridge''' by Poul Anderson.
Creator/PoulAnderson



* The ansible appears in most of [[UrsulaKLeGuin Le Guin's]] ''Ekumen'' novels. In ''The Dispossessed'' she tells, among other things, the story of its invention.

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* The ansible appears in most of [[UrsulaKLeGuin Le Guin's]] Creator/UrsulaKLeGuin's ''Ekumen'' novels. In ''The Dispossessed'' she tells, among other things, the story of its invention.



* ''EndersGame'' is a major example of another writer taking the name from [[UrsulaKLeGuin Le Guin]]. A character mentions that there is a formal name for their FTLRadio, but "somebody dredged the name ''ansible'' [[ShoutOut out of an old book]]." The working principle of an ansible link is something about "[[MinovskyPhysics subatomic philotic links]]" that form between two subatomic particles, which can be stretched infinitely when properly separated. FTL travel doesn't exist though [[spoiler: for most of the series at least]], so the ansibles are really the binding force for the entire interstellar civilization (to the point where one colony declares itself to be in rebellion and does the unthinkable by destroying their own ansible, or so it would seem...)

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* ''EndersGame'' ''Literature/EndersGame'' is a major example of another writer taking the name from [[UrsulaKLeGuin Le Guin]].Guin. A character mentions that there is a formal name for their FTLRadio, but "somebody dredged the name ''ansible'' [[ShoutOut out of an old book]]." The working principle of an ansible link is something about "[[MinovskyPhysics subatomic philotic links]]" that form between two subatomic particles, which can be stretched infinitely when properly separated. FTL travel doesn't exist though [[spoiler: for [[spoiler:for most of the series at least]], so the ansibles are really the binding force for the entire interstellar civilization (to the point where one colony declares itself to be in rebellion and does the unthinkable by destroying their own ansible, or so it would seem...)
21st Aug '16 12:35:45 PM nombretomado
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* EclipsePhase's Quantum Entangled Communicators provide instant communication regardless of distance, but like those in the Creator/CharlesStross example rely on pre-linked, finite "qbit reservoirs".

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* EclipsePhase's ''TabletopGame/EclipsePhase'''s Quantum Entangled Communicators provide instant communication regardless of distance, but like those in the Creator/CharlesStross example rely on pre-linked, finite "qbit reservoirs".



* {{GURPS}}: Ultratech has two versions. The first uses quantum entanglement (so it's impossible to intercept) the second is generic FTLRadio.

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* {{GURPS}}: ''TabletopGame/{{GURPS}}'': Ultratech has two versions. The first uses quantum entanglement (so it's impossible to intercept) the second is generic FTLRadio.
18th Aug '16 1:07:48 AM PaulA
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** The lack of FTL communication plays as a plot point a few times; in ''The Vor Game'', Miles uses the time lag between communications to [[MindScrew play with the head]] of his compulsive plotter opponent, [[spoiler: Cavilo.]]

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** The lack of FTL communication plays as a plot point a few times; in ''The Vor Game'', ''Literature/TheVorGame'', Miles uses the time lag between communications to [[MindScrew play with the head]] of his compulsive plotter opponent, [[spoiler: Cavilo.]]
10th Aug '16 1:40:51 PM UmbrellasWereAwesome
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* ''Franchise/{{Halo}}'': For most of its history, the UNSC had to rely on FTL ships to carry messages between planets. ''Literature/HaloContactHarvest'' describes this as being like the Pony Express. As noted elsewhere, the UNSC eventually develops the ability to communicate through slipspace by the time ''VideoGame/HaloReach'' takes place.

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* ''Franchise/{{Halo}}'': For most of its history, the UNSC had to rely on FTL ships to carry messages between planets. ''Literature/HaloContactHarvest'' describes this as being like the Pony Express. As noted elsewhere, the UNSC eventually develops the ability technology to communicate through slipspace play this trope straight by the time ''VideoGame/HaloReach'' takes place.
10th Aug '16 1:38:54 PM UmbrellasWereAwesome
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** The Forerunner technology was good enough to enable real-time conversions between people on opposite ends of the galaxy; it's explicitly stated that they use quantum entanglement. Additionally, their sensors were so good that they could provide detailed analysis of a single planet's geology and ecology from light-years away.

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** The Forerunner technology was good enough to enable real-time conversions between people on opposite ends of the galaxy; it's explicitly stated that they use used quantum entanglement. Additionally, their sensors were so good that they could provide detailed analysis of a single planet's geology and ecology from light-years away.
10th Aug '16 1:38:11 PM UmbrellasWereAwesome
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* ''Literature/HaloContactHarvest'' has a fun example of this working to somebody's disadvantage. A Kig-Yar (Jackal) {{privateer}} ship find the human colony of Harvest. All Covenant ships are equipped with a [[{{Precursors}} Forerunner]] device known as a "luminary", which scans for Forerunner energy signatures (and other factors) and automatically relays the data back to the Covenant capital of High Charity; the one here registers Harvest as having lots of Forerunner relics. Tampering with luminaries is forbidden under the pain of death (not the least reason being that they're Forerunner relics and are thus holy); the Kig-Yar attempt to do just that in order to prevent their luminary from letting the Covenant know about their discovery. They fail, which thus eventually leads to a war.

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* ''Literature/HaloContactHarvest'' has a fun example of this working to somebody's disadvantage. A Kig-Yar (Jackal) {{privateer}} ship find finds the human colony of Harvest. All Covenant ships are equipped with a [[{{Precursors}} Forerunner]] device known as a "luminary", which scans for Forerunner energy signatures (and other factors) and automatically relays the data back to the Covenant capital of High Charity; the one here registers Harvest as having lots of Forerunner relics. Tampering with luminaries is forbidden under the pain of death (not the least reason being that they're Forerunner relics and are thus holy); the Kig-Yar attempt to do just that in order to prevent their luminary from letting the Covenant know about their discovery. They fail, which thus eventually leads to a war.
10th Aug '16 1:36:32 PM UmbrellasWereAwesome
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* ''Literature/HaloContactHarvest'' has a fun example of this working to somebody's disadvantage. A Kig-Yar (Jackal) {{privateer}} ship find the human colony of Harvest. All Covenant ships are equipped with a [[{{Precursors}} Forerunner]] device known as a "luminary", which scans for Forerunner energy signatures (and other factors) and automatically relays the data back to the Covenant capital of High Charity; the one here registers Harvest as having lots of Forerunner relics. Tampering with luminaries is forbidden under the pain of death (not the least reason being that they're Forerunner relics and are thus holy); the Kig-Yar attempt to do just that in order to prevent their luminary from letting the Covenant know about their discovery. They fail, which thus eventually leads to a war.



* ''Franchise/{{Halo}}'': Played straight by every major faction, though the lore notes that UNSC didn't develop a reliable means of this until several years into the Human-Covenant War.
** Notably, FTL communications for UNSC civilians are slow enough that messages sent through Waypoint (basically an interstellar Internet) often have to be prerecorded.
** The Forerunner technology was good enough to enable real-time conversions between people on opposite ends of the galaxy; it's explicitly stated that they use quantum entanglement. Additionally, their sensors were so good that they could provide detailed analysis of a single planet's geology and ecology from light-years away.
** Covenant FTL communications are also near-instantaneous, as they reverse-engineered it from Forerunner tech. However, they have a bad habit of not encrypting their messages properly, which often works to their disadvantage.
** By ''VideoGame/{{Halo 4}}'', the UNSC has recovered some valuable tech from Shield World Trevelyan and a few Engineers familiar with Forerunner tech. Besides ''much'' better slipspace drives, they also get much improved FTL communications, including the ability to maintain communications while still in slipspace.
** The Flood has an esoteric method by which its Graveminds can telepathically control their hordes across multiple star systems; they can even use this to communicate with non-Flood beings on occasion.



* ''Franchise/{{Halo}}''. All messages are carried on ships that travel between planets. Described as the futuristic Pony Express.
** This is more a UNSC problem though as the Forerunner definitely had FTL communications (it's unclear if the Covenant have this technology or not). Some scenes also suggest that the UNSC has at least "short" range FTL sensors as for instance they seem able to detect ships incoming at FTL speed somehow. It's also notable that their never seems to be any delay in communications even over large distances inside systems.
** In the books it's shown that they'll send probes into slipstream, which will then scan for anything traveling FTL before returning to regular space, and then transmit the data back.
*** This does not solve the problem and indeed pretty much confirms the point. If these probes were limited to STL sensors and communications they'd be utterly useless as the incoming ships moving at FTL would be coming on ''faster then the STL signals bouncing off them could return or the warnings being transmitted back could arrive''. Also there are a number of instances in the novels that on reflection require or very strongly imply FTL communications. The most glaring is that at one point in the Fall of Reach captain Keyes holds a real time conversation with an Admiral in another system. This would be completely impossible without FTL communications and thus we must assume that while largely glossed over such systems exist at least by the later parts of the war.
** The book ''Literature/HaloContactHarvest'' has a Kig-Yar (Jackal) {{privateer}} ship find the human colony of Harvest. All Covenant ships are equipped with a [[{{Precursors}} Forerunner]] device known as a "luminary", which scans for Forerunner energy signatures (and other factors) and relays the data back to High Charity. Tampering with luminaries is forbidden under the pain of death (not the least reason being that they're Forerunner relics and are, thus, holy). The Kig-Yar attempt to do just that in order to prevent their luminary from letting the Covenant know about the discovery. They fail. The rest is history.
** By ''VideoGame/{{Halo 4}}'', ONI has recovered some valuable tech from Shield World Trevelyan and a few Engineers familiar with Forerunner tech. Besides ''much'' better slipspace drives (which can even fit inside a Pelican dropship), they also get instant FTL communication at, apparently, low energy costs. Naturally, ONI keeps all the best toys for itself.

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* ''Franchise/{{Halo}}''. All ''Franchise/{{Halo}}'': For most of its history, the UNSC had to rely on FTL ships to carry messages are carried on ships that travel between planets. Described as the futuristic Pony Express.
** This is more a UNSC problem though as the Forerunner definitely had FTL communications (it's unclear if the Covenant have this technology or not). Some scenes also suggest that the UNSC has at least "short" range FTL sensors as for instance they seem able to detect ships incoming at FTL speed somehow. It's also notable that their never seems to be any delay in communications even over large distances inside systems.
** In the books it's shown that they'll send probes into slipstream, which will then scan for anything traveling FTL before returning to regular space, and then transmit the data back.
*** This does not solve the problem and indeed pretty much confirms the point. If these probes were limited to STL sensors and communications they'd be utterly useless as the incoming ships moving at FTL would be coming on ''faster then the STL signals bouncing off them could return or the warnings being transmitted back could arrive''. Also there are a number of instances in the novels that on reflection require or very strongly imply FTL communications. The most glaring is that at one point in the Fall of Reach captain Keyes holds a real time conversation with an Admiral in another system. This would be completely impossible without FTL communications and thus we must assume that while largely glossed over such systems exist at least by the later parts of the war.
** The book
''Literature/HaloContactHarvest'' has a Kig-Yar (Jackal) {{privateer}} ship find the human colony of Harvest. All Covenant ships are equipped with a [[{{Precursors}} Forerunner]] device known describes this as a "luminary", which scans for Forerunner energy signatures (and other factors) and relays the data back to High Charity. Tampering with luminaries is forbidden under the pain of death (not the least reason being that they're Forerunner relics and are, thus, holy). The Kig-Yar attempt to do just that in order to prevent their luminary from letting like the Covenant know about Pony Express. As noted elsewhere, the discovery. They fail. The rest is history.
** By ''VideoGame/{{Halo 4}}'', ONI has recovered some valuable tech from Shield World Trevelyan and a few Engineers familiar with Forerunner tech. Besides ''much'' better
UNSC eventually develops the ability to communicate through slipspace drives (which can even fit inside a Pelican dropship), they also get instant FTL communication at, apparently, low energy costs. Naturally, ONI keeps all by the best toys for itself.time ''VideoGame/HaloReach'' takes place.
10th Jul '16 6:02:06 PM ChronoLegion
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Added DiffLines:

* Inexplicably possible in the Soviet two-part sci-fi film ''Film/MoscowCassiopeia'', where the teen cosmonauts are able to attend classes via teleconference while in interstellar space. Later, when they end up traveling at near-light speeds and end up at their destination early (from their viewpoint), they talk to mission control back on Earth in real-time. There is also the moment where [[MenInBlack IOO]] uses a rotary pay phone and a metal cigar case to show real-time footage of the starship to TheCaptain's parents, but his abilities appear to be far beyond what's possible even in the film's science.
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