Ask Lemmy

I prefer the STL in Card's Ender's Game series. They asymptotically approach the speed of light so the passengers only have several weeks pass when travelling to far flung locations but the universe around them experiences a normal passage of time which may be tens of years. This has really big implications on the plots in several stories.

They do have an ansible communications system that does allow instantaneous communication over astronomical distances.

goes Plaid

I wouldn't say it was my favourite FTL but it has some interesting implications.

The artificial wormholes of The Algebraist by Ian Banks. I can't say too much if you haven't already read it, but it's artificial wormholes that have to be transported sublight.

All the new wormholes are of course lovely and high capacity, but much of the network is still the original tiny little ones first installed. So your military at least uses kilometer long needle ships that can fit through these small points.

Think fitting an aircraft carrier through a Stargate.

Silfen Paths from Judas Unchained. Aliens called Silfen walked from planet to planet directly via actual forest paths. Everything gets wonky time wise when your on one so you might emerge 100 years later. The technology itself is sentient and not maintained. The Silfen who lost interest long ago are asked how they manage the paths. They say they just let them do what they want. At least one path exists to/from Earth. But humans are boring and make things boring, so the aliens avoid Earth.

So if you're on a walk and you get lost you may be walking to another planet.

The Infinite Probability Drive from Hitchhiker’s Guide to the Galaxy.

I like the kind where they didn't try to explain it. Trying to show how they make their sausage never works out well. I can suspend disbelief for FTL but not for their stupid explanations

One thing I'll say is that I prefer gates or portals to "Teleporters" for the obvious "it actually kills you" thing

No mention of Futurama? Screw moving the ship, just move the universe around it!

CJ Cherryh and Joel Sheperd use basically the same system in their universes (Sheperd admitted he basically adopted CJ’s almost verbatim).

Ships can travel FTL transitioning into another plane of existence (to say it in an uncomplicated way), but to do so they must first acquire a speed very close to c. And when they transition back to the regular space they do it at transluminic velocity, that they must shred off pulsing their hyperdrives before coming down to ‘maneouvring’ speeds.

All of this makes for interesting tactical situations in the intent of an interstellar conflict.

Not ftl but I really like cryo sleep themes. Someone wakes up 100+ years later and the world is post apocalyptic. James axlers deathlands audio books, alien, some obscure video games.

I liked the wormholes from the Bobbyverse. You had instantaneous travel across interstellar distances but you had to get there via slower than light speed first. So no matter how technologically advanced you became your interstellar civilisation still grew at a rate of one or two systems per decade.

Star Control had an interesting take on it, where you're able to jump between eiffererent "levels" of space if you have something that can induce the right field and at the right level of power. Sort of like jumping between electron shells or something.

But you can jump from normal space, to hyperspace on top of that, to quasispace on top of that. And maybe others above (and below). Traveling a certain distance in each space allows you to travel an exponentially larger amount of distance in the lower space.

So you induce a field, pop up to hyperspace, move at less than FTL (as relative to hyperspace), then fall back to regular space.

My favourite one is Red Dwarf when they see the future. Requires a fair amount of "dont think about it" but its still a great plot.

FTL travel in the series of book "the interdependency" is one of the major plot devices, so it's one of those that marked me the most.

Without going into spoilers: FTL is limited to using a natural phenomenon that are pretty much akin to space-rivers, so humanity has no power onto what systems are connected to one another.

As rivers do, those "currents" can also shift and have done so in the past: the place where the books happen are completely cut off from earth since pretty much forever, for example.

I love the Farcaster network of the World Web from Dan Simmons' Hyperion Cantos (for anyone who hasnt read the books, they're essentially frameless stargates that are always on). Such a cool concept of being able to build a series of them linking the main commercial streets of the biggest cities on different planets together; thus making one gigantic and near endless market across hundreds of worlds... and anyone can just walk from one planet to another across hundreds or thousands of light years.

What I really like about that book series though is that the Farcasters are not the only means of FTL... and that there are sound reasons to use another method over them OR even to oppose your planet getting connected to the Farcaster network. Just seriously good world building.

I like how Stellaris does hyperdrive; certain systems are connected by hyperplanes. Presumably something "man-made" in those systems generates the field and "throws" the ship to the next system.

Similar to Mass Effect except that whereas in Mass Effect, one generator can connect to any other, in Stellaris each one only goes between two points, like a subway.

The Hyperspace Gates in Cowboy Bebop always seemed to be pretty plausible. They didn't explain all the science behind them, but there was enough to show that the was science behind it, and it had been commercialized enough that people had a basic understanding of them.

I thought the Expanse did this really well. For starters, most travel is restricted as we currently know it. They have the Epstein drive, but something like that is feasible. In any case, humans are still meat bags that can only accelerate so much.

But then the FTL component requires some otherworldly technology with gating. That leaves the physics mystery to having been built by some smarter species and I think that is perfect for suspension of disbelief.

In the Commonwealth Saga it's trains! It's portals with hugely demanding power consumption. They mostly have to stay fixed to one place and open. So they run choo choos. Their world is commerce and economics. And trains are a lovely symbol of that.

In The Final Architecture it's jaunty. Unspace helps you go fast but you are always alone. Crewmates gone. When you come out they reappear. When you inside there is something coming to get you. Something that lives in unspace and doesn't like that we use it for travel. The terror of its hunting you drives everyone to suicide. So instead they sleep. Magic "you sleep now" pods for everyone.

Except. You can only sleep if you are on a known route. Some rare people can feel out new routes. And they have to say awake. Most shows just follow normal routes. But the special ships with these other folks can go all over the place! At the cost of route terror.

The books are about coming together in the face of adversity cosmic horror. And unspace is a foil to that. You are alone. But we do what we can anyway. Your alone now, but not forever. Unless the monster gets you.

The one where humans discover a way to "skip" through space in jumps – which shouldn't be possible and puts a strain on the traveler – until they discover the real deal from aliens.

Aside from that, the more common type with beacons or gates.

Singularity Sky by Charles Stross. It deals heavily with causality and "light cones." There's some super advanced entity in the universe that enforces a ban on causality-breaking FTL, so it's not possible for anything to mess with the entity's development, iirc.

Stross's Neptune Brood also has some interesting stuff about FTL economics. It's somewhat of a satire on cryptocurrency, NFTs, and marketization in general.

I love the idea that navigators in Dune ripped a line of space cocaine to forsee the best path through folded space for travelling.

As long as it's got "dat woosh", I'll love it.

Elite Dangerous, Star Trek, Battlestar Galactica, and Battletech are my favorites, though.

FRIENDSHIP DRIVE CHARGING BABY!

"Warning! Hyperspace conduit unstable!"

Uh oh.

in mass effect, the core can manipulate the mass of a surrounding ship, making lightspeed travel possible.

Infinite Improbably Drive in Douglas Adams’ Hitchhiker’s Guide to the Galaxy.

Farnsworth: These are the dark matter engines I invented. They allow my starship to travel between galaxies in mere hours.

Cubert: That's impossible. You can't go faster than the speed of light.

Farnsworth: Of course not. That's why scientists increased the speed of light in 2208.

Event Horizon… it just had a few downsides.

Does L space in the Discworld novels count?

So I really like the Stargates. They're a lot more limited/less flexible in where you can travel, but with that limitation comes unique challenges and intriguing stories. The biggest pro about them? It's the fastest form of FTL there is. You can travel literally instaneously to any other gate. And there are innumerable gates to travel to.

But there are a lot of cons too.

Convenience... gates must already be where you'd like to go. The gates are relatively small, unable to fit even a car through, and the gate has a time limit on holding it open so there is limited ability to send large quantitaties of goods through and absolutely no large objects.

Risk... connections are blind, so you don't know what's on the other side until you or a probe goes through and relay back details. And it's a single point of entry, and only one way, so it's easy to be trapped or ambushed on the other side without escape. The gate can also be damaged or have its dialing device missing, disabled or destroyed, making it functionally useless from that end. If your gate is dialed into, the only way to stop anyone from traveling through is with a barrier so close to the wormhole event horizon to make molecules unable to materialize. But even then, they can hold your gate open from their end for the time limit of the wormhole, and then immediately redial and prevent you from using it indefinitely.

Unknowns... Certain anomalies like black holes affecting the destination gate can also pose a cataclysmic danger to planet of the gate of origin. Random happenstance with solar flares can cause the wormhole to travel through time as well as space. Gates may be too far to travel without extra power, and there may not be power available on the other side to get back. Gates can be dialed at random or you may have a list of addresses, but without someone who's been to these gates before, you have no idea who or what you'll find on the other side until you dial it.

The typical use for the gates is cool, but the really interesting stuff is when things go wrong, or when people get really creative with the mechanics. Things going wrong like heading home to Earth but being gated unexpectedly to an icy cave with no exit and no dial device to be found and everyone having to figure out where you went even though none of it seems to make sense. And creative things like overcoming the gates' distance limitations/extra power needs to cross between galaxies by daisy chaining hundreds of them in the void between the galaxies and setting up a macro to pass the matter buffer from one to the next without rematerializing the objects and people within in between.

Of course, traditional FTL ships exist in Stargate, but they are much slower than the instantaneous stargates, and have other dangers associated with them, like other armed ftl ships, pirates, replicators... Most ftl ships in stargate use hyperspace travel, but I believe that the Ancient's inter-galactic stargate seeding ship, Destiny, uses a classic warp drive.

The exact mechanics are never explained, but I’ve always loved “fenestering” in David Zindell’s Neverwhere and Requiem For Homo Sapiens trilogy.

A pilot, in a one-person “lightship”, interfaces with their computer, merging their minds into one. They then solve maths equations which have never been solved before and prove new mathematical theories. This opens up a window underneath the ship, which it falls in to, into hyperspace. They then need to do more novel maths to open up the window to where they’re going and fall through that.

It’s weird and it’s nerdy and it’s poetic and it’s mystical, like everything in the books, and it’s just so incredibly cool.