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In a Star Trek fan fiction, I was planning to have the crew use subspace domains to travel to another galaxy, but I don't know if this is actually possible in canon. In the Star Trek universe, can subspace domains be used to travel to different galaxies?

  • Or that cloaking device on the Pegasus becuse it traveled thought matter its self dark matter might work tell me if I should use this for a story – Joshua Farrow Aug 20 '17 at 23:18
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    May be a better fit for worldbuilding.stackexchange.com – Organic Marble Aug 21 '17 at 0:01
  • Stargate has hyperdrives with variable speeds, some ships do interstellar in reasonable times, some do intergalactic – Nick T Aug 21 '17 at 0:59
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    Star Trek science is completely subservient to the needs of the writers. "Subspace domain" is as good a piece of explanatory technobabble as any. – Politank-Z Aug 21 '17 at 1:28
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    @Politank-Z: This is true, but some Star Trek technology has developed a limited degree of rigidity. For example, you normally cannot beam through the shields. Will this stop a determined writer? No (spoiler link!), but they will have to put in an extra line of dialog acknowledging the irregularity. I'd say Trek is slightly harder sci-fi than, say, Doctor Who ("This is my timey-wimey detector. It goes ding when there's stuff!"). – Kevin Sep 3 '17 at 23:54
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On Memory Alpha, it mentions that Kelvans came from the Andromeda Galaxy on generational ships, but almost all of Trek has focused on the good ol' Milky Way.

You could also go anywhere when you go Warp 10/infinity speed!, but even then the story doesn't really venture a day or two from Voyager. Likewise, Q or the Traveler also go "everywhere", but without the need for pesky ships.

Note that going into extra-dimensional realms and back again wasn't a revolutionary way to get home quicker. Transporting to parallel universes also basically maintained positions.

Looking up some other galaxies in Memory Beta, the repository for non-canon Star Trek works, it mentions that the Andromeda Galaxy has been lightly explored via transwarp corridor

Both the Andromeda and Milky Way galaxies are connected by a transwarp corridor which increases the travel speed of transwarp voyages between the void, the USS Monitor during transwarp trials accidentally found its way into this corridor and was stranded between galaxies as a result.

Other "galaxy ships" (not Galaxy-class) were built for intergalactic exploration

In the 2280s, Starfleet had begun to look at exploring the Andromeda Galaxy and sent several long-range starships, including the USS Magellanic Clouds, to investigate.

You could trace through more pages on Memory Beta to find something to build off of that would work for you. If you want a looser list of dimensional Trek techno-babble, see parallel universe.


Voyager, by its premise, has come across lots of ways to maybe get home quicker, and they basically all fail. Let's say you wanted to get to the Large Magellanic Cloud (160 kly) or the Andromeda Galaxy (2.5 Mly). Their normal sustained warp would do the 75 kly in 75 years, so at a normal pace it'd take 160/2500 years.

Other series'

  • Subspace vortex from Enterprise, that at 180 ly/h would take 37 days/1.5 years. Note that this is way faster than TNG/VOY tech despite being centuries older.
  • What about the dark matter barrier at the edge of the milky way galaxy – Joshua Farrow Aug 21 '17 at 1:32
  • Is your question that narrow or do you just want a Trek way to go between galaxies? I'm trying to provide examples for the latter. – Nick T Aug 21 '17 at 1:36
  • Well I would like it to line up with the science of the and voy and ds9 so I wanted to do my research – Joshua Farrow Aug 21 '17 at 18:29
  • DS9 didn't have anything quick beyond the semi-artifical wormhole. Look at every failed or successful technology from Voyager and take one of them or technobabble a fix for it. – Nick T Aug 21 '17 at 19:49
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    @Kevin I extrapolated everything, so it's all fair game. I think their thing would also fall under my listed "Wormhole flavors" as "Magic Cytherian knowledge". Josh really just needs to embrace that Star Trek ships run on plot, and develop a travel method that emits interesting stories (messy mixed metaphor...) – Nick T Sep 3 '17 at 20:50

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