Stargate: the gate network (1994 film, SG-1 1997 onward)
A ring that dials another ring: stable wormholes between fixed gates, one way for matter, thirty-eight minutes at a time, built by somebody long gone.
Kind: fiction · Loophole: L3 · Notability: N1 · Coherence: F3 · Causality: C-owns · Last reviewed: 2026-09-12
The drive as depicted
The 1994 film (directed by Roland Emmerich, written by Emmerich and Dean Devlin, released 28 October 1994) defines the device [HIGH] S3. A ring excavated at Giza carries thirty-nine symbols; the linguist Daniel Jackson works out that an address is six constellations fixing a point in space plus a seventh symbol for the point of origin, and when seven chevrons lock the ring opens a wormhole to a matching ring on a desert planet [HIGH] S3. In the film that planet lies in another galaxy, the Kaliam galaxy, millions of light years away; the television series later moved it into the Milky Way [HIGH] S3. The opening of the gate is a burst of what the production called the kawoosh, a water-vortex effect filmed in a glass tube, after which the event horizon settles into a standing pool that travellers step into [HIGH] S3. The film's own account of transit is that matter entering the event horizon is broken down and sent through the wormhole, then reconstituted at the far gate [HIGH] S3.
Stargate SG-1 (1997 to 2007), Atlantis (2004 to 2009) and Universe (2009 to 2011) added the rules, and each rule has an episode. The pilot "Children of the Gods" establishes that matter travels one way, from the dialling gate to the receiving gate, while radio signals pass in both directions [HIGH] S3. The thirty-eight-minute limit, after which a wormhole closes on its own unless enormous power is supplied, is stated in the SG-1 episode "A Matter of Time" and is the title of the Atlantis episode "Thirty-Eight Minutes" [HIGH] S3. "A Matter of Time" is also where the gate is connected to a planet falling into a black hole and the wormhole refuses to close, with time dilation across the event horizon shown on screen [HIGH] S3. "The Fifth Race" adds an eighth chevron for addresses in other galaxies; Universe uses nine [HIGH] S3. The SG-1 episode "1969" sends the team into the past when a solar flare intersects the wormhole in transit, and later episodes ("2010", "Moebius") reuse the effect deliberately [HIGH] S3. The average transit time is given in "Insiders" as 3.2 seconds [HIGH] S3. The gates are the work of the Ancients, an extinct or ascended race; the direct-to-video film The Ark of Truth names the originator as Amelius [HIGH] S3.
The picture that results is unusually definite for television. Gates only connect to gates. A connection has one source and one destination, lasts at most thirty-eight minutes, is entered through a flat disc, sends matter one way and radio both ways and can be shut from the receiving side by covering the event horizon with an iris, which does not stop the connection but leaves nothing for a traveller to be reconstituted into [HIGH] S3.
Origin and lineage
The film's device is a portal in the old pulp sense, and its address system is the invention that makes it a network rather than a door [HIGH] S3. The word "wormhole" is not in the 1994 film's dialogue, where West calls it a "doorway between our worlds"; it arrives with the series pilot "Children of the Gods" (1997) [MED] S3 (two transcripts checked for the lineage page). The series ran the word back to its physics: Samantha Carter explains the gate as generating a stable wormhole, and the black hole episode is written around real time dilation [MED] S3. No episode names Morris and Thorne, but the vocabulary (event horizon, stable wormhole, exotic energy for the gate) is the vocabulary that Morris and Thorne 1988 put into circulation six years before the film, and the lineage README seeds a page for the descent from the paper to Stargate, Deep Space Nine and Farscape. The gate is the opposite design to the one-ended gateways of the Commonwealth, which open from a generator to a place nobody has visited. The flat disc of the gate, a two-dimensional surface in three-dimensional space with the far side elsewhere, is the picture of Visser's thin-shell wormhole: cut a hole in two copies of space and identify the edges, with all the exotic matter in the frame. The "1969" solar-flare time travel is the fiction's version of CAU-3, a wormhole becoming a time machine, though the show's mechanism is a flare, not a boosted mouth.
Lineage: The wormhole goes to television.
Which loophole, and why
L3, a shortcut with fixed endpoints. Nothing flies; the traveller steps through a disc and is reconstituted at a second disc. The show's own dematerialisation rule makes the transit a transmission rather than a passage, which is why the transit takes seconds regardless of distance and why the gate can be shut with an iris. The cousin is Morris and Thorne 1988, whose bill is negative energy at the throat scaling with the throat radius, mass beyond engineering, a route laid in advance and a time machine on assembly. Stargate pays the third in full (the Ancients laid the network and nobody dials a gate that is not there), pays the fourth by accident in "1969" and never mentions the first two.
The rules it keeps
- Gates only between gates. A destination without a gate cannot be reached; the address system has no meaning otherwise, and the show's ships (scored separately at stargate-hyperdrive in the catalogue) exist because of it [HIGH] S3.
- One way for matter, both ways for radio. Stated in the pilot and kept across three series; it drives dozens of plots in which a team is cut off until Earth dials them [HIGH] S3.
- Thirty-eight minutes. The wormhole closes after that unless an enormous power source is on the line, and the black hole episode is the exception that states the rule [HIGH] S3.
- The iris. Cover the event horizon and incoming matter has nowhere to reintegrate; the show applies this consistently, including its failures [HIGH] S3.
- Someone else built them. The network is inherited from the Ancients; humans learn to dial it, then to build ships, and only late in the franchise to make gates [HIGH] S3.
F3 rather than F2: the endpoint rule and the one-way rule are limitations with a shape (a network of fixed portals, with the physics of a thin-shell mouth implied by the flat disc) rather than arbitrary cooldowns, they are applied without exception across three series and a film, and the black hole episode engages real dilation. The thirty-eight-minute limit is F2-flavoured, a number with no physical content, but it is one rule among several that do have content.
What it ignores
What holds a gate open, what the exotic energy budget is and what the quantum inequalities would say about a disc a few metres wide standing open for half an hour: never addressed in any instalment, with the exception that the show says gates need large power to dial and that a black hole can hold one open indefinitely [HIGH] S3. On causality the show does not stay silent. "1969" and its successors treat gate travel as capable of delivering the traveller to a different time, and the episodes are built on it, so the franchise admits the implication and uses it. The mechanism is a solar flare bending the wormhole, not the frame argument of CAU-1, and no episode observes that a gate connecting Earth to a planet a thousand light years away in 3.2 seconds is already a message into somebody's past. C-owns, with that caveat written down: the show owns time travel through wormholes as a phenomenon and never presents it as a consequence of the gate.
Constraint scoring
Every entry in the register, one row each, verdict from the fiction vocabulary in GRADING.md, with a note that says where in the work the engagement or rule occurs.
| Constraint | Verdict | Note |
|---|---|---|
| CAU-1 | SILENT | A gate delivers a person across interstellar distance in 3.2 seconds ("Insiders"); no episode asks in which frame the arrival preceded the departure. The time travel the show does have is by solar flare, not by boost. |
| CAU-2 | SILENT | Chronology protection is never invoked; the time loops of "1969", "2010" and "Moebius" close or rewrite without any principle forbidding them. |
| CAU-3 | ENGAGES | The show turns a wormhole into a time machine on screen, repeatedly, and builds episodes on it. The mechanism (a flare intersecting the wormhole) is not the register's boosted mouth, but the phenomenon is the one CAU-3 describes: a wormhole that can be created and maintained for travel can be converted into a time machine. Gates are also moved by ship in the series, with no comment on the consequence. |
| CAU-4 | SILENT | No preferred frame is stated; transit is treated as effectively simultaneous everywhere and nobody says what frame that is in. |
| CAU-5 | N/A | The gate transmits matter and radio through a wormhole; no entanglement signalling is involved. |
| ENE-1 | SILENT | The gate is said to need power to dial and to be held open by a black hole in "A Matter of Time", but the currency of a wormhole, negative energy density, is never named. |
| ENE-2 | SILENT | That the shortcut requires negative energy somewhere along the way is never stated. |
| ENE-3 | SILENT | A disc several metres across held open for thirty-eight minutes is priced by the quantum inequalities; the show gives a duration and never a reason for it. |
| ENE-4 | N/A | Warp-bubble pocket geometry. |
| ENE-5 | N/A | Not a Natário-class warp metric. |
| ENE-6 | SILENT | No source of negative energy is named. |
| ENE-7 | SILENT | A gate is a shortcut visible from outside in a flat region; topological censorship is never touched. |
| CON-1 | N/A | No warp bubble, so no bubble horizon. |
| CON-2 | RULE | The stated rule is that gates only connect to gates and the gates were laid by the Ancients; the traveller never creates the far end. This is CON-2's escape hatch (devices placed along the way in advance) as a rule of the fiction. |
| CON-3 | N/A | No Krasnikov tube. |
| STA-1 | N/A | Warp-bubble instability. |
| STA-2 | SILENT | What threads the throat is never described; the event horizon is a pool of light and the gate a ring of naquadah. |
| STA-3 | SILENT | The time loops of "1969" and after create chronology horizons in effect, and no episode asks whether anything diverges there. |
| HAZ-1 | N/A | Warp deceleration burst. |
| HAZ-2 | N/A | Warp-bubble Hawking flux. |
| HAZ-3 | RULE | The dematerialisation rule (film; "Children of the Gods") means nobody crosses a throat as an extended body, so the tidal bound is answered by fiat: there is no body in the tunnel to be stretched. |
| LOR-1 | RULE | Nothing is accelerated; matter is converted at the event horizon and reconstituted at the far gate. The rule removes the object whose kinetic energy LOR-1 would price. |
| LOR-2 | N/A | No tachyons. |
| LOR-3 | N/A | No signal in a medium; radio through the wormhole is the show's rule, not a dispersion claim. |
| LOR-4 | N/A | Neither the Scharnhorst effect nor the OPERA anomaly bears on a gate. |
| WRP-1 | N/A | Not a warp metric. |
| WRP-2 | N/A | Not a moving shell. |
| WRP-3 | N/A | No positive-energy warp claim. |
| MAN-1 | N/A | The gate never leaves the manifold; the show's subspace is the province of its ships' hyperdrives, scored elsewhere, and the wormhole is presented as a tunnel in ordinary space. |
Sources
- S1 Stargate (1994), directed by Roland Emmerich, written by Emmerich and Dean Devlin, MGM/UA, released 28 October 1994. The address decipherment and the first transit.
- S1 Stargate SG-1: "Children of the Gods" (1997), "A Matter of Time" (1999), "1969" (1999), "The Fifth Race" (1999), "2010" (2001), "Insiders" (2006), "Moebius" (2005). Stargate Atlantis: "Thirty-Eight Minutes" (2004). Stargate: The Ark of Truth (2008). Episode attributions taken from the S3 sources below, not from re-viewing.
- S3 Wikipedia, "Stargate (device)" and "Stargate (film)", for the rules with episode attributions and for production details.
- S3 SGCommand (stargate.fandom.com), "Wormhole physics", and GateWorld's Stargate Omnipedia, "Wormhole", for the same rules; consulted via search summaries.