this post was submitted on 12 Jul 2026
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Science Fiction

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Lemmy World Rules

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I'd love to hear about your favorite concept or idea you've read about or seen in scifi media.

My personal favorite is the Conjoiner Drive out of the Revelation Space series. These ship drives are dual drives on either side of a lighthugger and have a living being inside the drives to act as a supercomputer, which holds a wormhole open inside the drives. The wormhole links far in the past to the big-bang and uses the energy from the big-bang for propulsion.

In most scifi I've come across wormholes are used for FTL travel, and I thought this was such a unique and creative use of a wormhole it has stuck with me for years after reading about it.

So what are your favorite devices or ideas that have come out of scifi media?

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[–] Swedneck@discuss.tchncs.de 1 points 3 months ago

Idk if it's my favourite but i really appreciate how simple and elegant the concept of a stargate is, and how great it works as a centrepiece for stories.

[–] Tollana1234567@lemmy.today 1 points 3 months ago* (last edited 3 months ago)

the various forms of FTL, including dimensional teleportation. hyperspace seems quite common between 3 scifi universes. wormhole drives. the most unique seems to be doctors who tardis which uses a form time travel/ftl. that doesnt violate the C velocity, its a way to explain away/bypass, unlike warp drive.

favorite in trek is the vortex drive(xindi,spherebuilders) is similar to transwarp of voth and borg(voth seems to have a more advanced version than the borg since they can cloak at high warp/transwarp which most species can use both tech at the same time, the borg needs a subspace field for thier transwarp and coils), and slipstream of aucturs species.

other unusual ones is the caretakers intergalatic ftl, which uses thier array to produce a wave of energy that makes them pass through a rift, or subspace so almost instantaneous travel.

asgard seems to have the fastest hyperdrives out there unassisted with zpms(although they use massive generators), not even the deadalus class, or even the zpm powered odessey is that fast.

[–] TheDarkestShark@lemmy.world 1 points 3 months ago

I started reading a new series called The Captives War, same author as The Expanse. The book starts on a non-earth planet where humans have a seemingly similar level of science and tech as today. They discuss knowing that this planet is not their home world because they live along side another evolutionary tree but they do not know how they got there.

Its not really the main focus of the story so it hasn't really been explained yet, I only read the first book so far and the third of the trilogy is not yet released. Some fan theories think its a connection to the end of The Expanse book series, where spoiler spoiler the network of portals connecting 1000s of world's is destroyed stranding millions of people on 100s of worlds across the universe.

I just really like the concept of humans industrializing on an alien world and how they got there was simply lost to time. The fan theory is also partially why I like it but I'm sure it will have a different explanation.

[–] Sir_Thominick_IV@lemmy.world 1 points 3 months ago

Starship 3000

As I remember it, it was a terribly written book about a colony on the moon with a water ocean, and an asteroid hollowed out to be a seed ship to travel the stars and colonize planets.

The first half of the book was the colony on the moon part, and it went into the physics of an ocean with very low gravity, and how massive the waves get as a result. That part was cool.

And the asteroid seed ship was also very cool, it was described as being an entire ecosystem with hundreds of square miles of earth-like terrain, with small towns sprinkled all over the place.

But the writing was so hard to follow. It was all abstract, pronouns and names were hardly used enough to keep track of what was being talked about. Reviews for the book follow a similar pattern.

I've had a mind to make game about the asteroid seed ship because I feel like the concept hasn't been done justice.

[–] CkrnkFrnchMn@lemmy.ca 1 points 3 months ago

Mine would be "The RiverWorld" novels by Philip José Farmer...

[–] jaycifer@lemmy.world 1 points 3 months ago

In my own made up worlds I often imagine FTL works by moving between the 2nd and 3rd dimensions. 3D is “flattened” in such a way that point A (where you start) and point B (where you want to be) are at the same point of the now 2D universe. During the transition back to 3D, points A and B go back to their original positions, but you are now at point B.

[–] Couldbealeotard@lemmy.world 1 points 3 months ago

In Michael Crichton's Timeline, they send people back in time hundreds of years until they push a button to return, except they don't. The time travel has something to do with alternate timelines, so in theory there could be countless versions of them travelling back and forth in alternate universes or alternate realities or however you want to think of it.

The invention of time travel in our universe only got as far as figuring out how to send people back, but they never figured out how to return them to the present. Coincidentally a virtually identical alternate universe figured it out but they get sent to our universe on the way back to the present.

So every time we send someone back, we essentially kill them and in return we receive an alternate version of them that's so close to identical it's virtually the same as the original person. And for every person we get back, another universe loses that person forever. The organisation doing the time travel secretly know this is happening, but it works and it's cheaper then finishing the invention of time travel.

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