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I am writing up a system of wormhole-based gates to allow "fast travel" in a far-future setting. My description is an extrapolation of the way I understand a flatlander's experience of the following illustration of an [Ellis wormhole](https://en.wikipedia.org/wiki/Ellis_wormhole):
![ellis wormhole image]... |
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From 359 to 298 million years ago, the "Carboniferous Coal Swamps" dominated the continents.
[](https://i.stack.imgur.com/VmSZb.jpg)
It was the Carboniferous coal itself that sparked one of the greatest watersheds in human history--the I... |
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Noting that
[this question](https://worldbuilding.stackexchange.com/q/56243/885)
is specific to *human* colonization, and Thucydides’s answer is explicit that driving concerns are *to support life*, and I notice that the story I’m working on turns this on its head because the [premise is different in a ... |
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I'm trying to create a habitable planet but with a low atmospheric pressure, similar to Mars. But instead with 15 percent of Earth's atmospheric pressure, what traits can I give my animals so they have the best chances to survive? If the atmospheric composition is about the same as Earth and orbiting a s... |
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Humanity is an advanced civilization, and has long, long since took to the stars. Their resources are seeming boundless, and their technology is fantastic. For some reason beyond our 21st century understanding, they have decided to perform a very odd experiment. They wish to create a world and strand a f... |
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Is it possible that a large, multicellular, naturally evolved organism with an advanced intellect on the order of a human's could have evolved to pass on its knowledge and memories in a fashion that could be described as 'genetic'?
By 'genetic', I mean that a newly born/hatched/whatever organism would em... |
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I'm currently building a world centered around a city. This city's main export, currency, and source of power are little metal orbs containing energy. Basically, it's the only place in the world where those are produced, and everyone in the city needs some.
They're not only used as money would be (buying... |
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# The question
How would a fortress built on a floating island look like? what kind of defensive emplacements and structures could be expected to be built for such a construction in order to defend it from attacks in the setting described below?
# Context
The world is a gas giant planet about twice the s... |
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**Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers.
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There have been questions about [sizing giant animals](https://worldbuilding.stackexchange.com/questions/316/can-you-simply-scale-up-animals), [giant humanoids](https://worldbuilding.stackexchange.com/questions/8569/how-to-make-a-realistic-giant), [giant flying creatures](https://worldbuilding.stackexcha... |
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This question
[How often must carnivorous grassland eat?](https://worldbuilding.stackexchange.com/questions/38354/how-often-must-carnivorous-grassland-eat)
was really interesting for me to read. However it made me wonder, how would the bone grass scientifically kill? (is there a way to really make paral... |
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I am interested in writing a survival-themed interactive fiction story (a sort of "what would you do" scenario game). Obviously, the zombie apocalypse might come to mind as the setting, but this has been done to death (pun intended), and I would like to avoid those tropes.
My alternative scenario is thi... |
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The [Boötes Void](https://en.wikipedia.org/wiki/Bo%C3%B6tes_void), a.k.a the Great Void, is celebrated for having a comparatively(competitively) lower matter density than the rest of the universe. Imagine an intelligent species similar to our ancestors was to evolve (created, if you will) on a rogue supe... |
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Is there any way to make a planet with a [corkscrew orbit](https://www.newscientist.com/article/dn27516-corkscrew-planets-spiral-back-and-forth-between-two-stars/) ([like this](https://theastroholic.files.wordpress.com/2015/05/spiral_04.jpg)) that could host a sci-fi civilisation? It'd be amazing if ther... |
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I'm talking about ionized gas not the plasma in our blood. I have been reading science articles about plasma and they keep hinting at the idea of plasma based life.
[Here](https://www.newscientist.com/article/dn4174-plasma-blobs-hint-at-new-form-of-life/) is my first example and an added [second](http://... |
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In an alternate universe there is a force known as the emotion force although the force has nothing to do with emotions. Anything that interacts through the emotion force has an emotion charge that is either positive or negative. Emotion charge is entirely independent of electric charge. Like emotion cha... |
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Following the same geometry as [this question](https://worldbuilding.stackexchange.com/questions/25547/if-one-of-the-spatial-directions-wrapped-around-how-would-combat-be-different), how would architecture be different?
To review, when go east or west 5 feet, you end up back where you started.
Is there a... |
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I seek a realistic method, either by genetic change or other scientific method that doesn't require magic or future tech, to obtain naturally occuring two tone hair for a race of humanoids.
My idea is simple, **as the hair grows in length, X happens that causes a natural change in color.** Basically the... |
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In many series (Elder scrolls for example) they have a huge moon. It is rare though when they explain how it can be larger. There are only two choices both of which couldn't work;
One is to bring the moon closer, but that can get risky, how close can it get for example never mind the tides.
Two is to ke... |
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This is a common trope in Scifi; Android armies. From Star Wars, to Battlestar Galactica, these mechanical beings have influenced the content of our movies and books in many ways.
**Android specs**
* roughly 10 times stronger than the average human
* possibility to reach maximum speeds of 64 kmph
* A bre... |
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NASA's Project Orion created the concept of a spacecraft that detonated nuclear bombs behind it, and rid the shockwaves as a form of propulsion, but the project was abandoned because nuclear bombs are dangerous and there is no need for something that powerful.
However, let's say that today, an apocalypse... |
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In my world agriculture doesn't work, the day lasts many years so the people are always on the move. You can't farm if you won't be there for the next 8 or 9 years. Well, When I read this question it got me thinking. After reading [this question](https://worldbuilding.stackexchange.com/questions/22459/fe... |
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**My question regards mirroring**, specifically what you would expect from a universe that was mirrored from the perspective of our own, regarding its interactions with our own. The mirroring works exactly, well like a mirror, so handedness is going to be switched it seems on many things.
**The universe*... |
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So in a setting I'm developing, a moon orbits a gas giant once every four days. It naturally is tidally locked to the parent body. Halfway through the day part of the cycle there is a two hour solar eclipse. If you assume hour zero is dawn, then the schedule looks somewhat like this for the part of the m... |
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I am writing a book and have a species of invasive plants which secretes acid to turn plant and animal matter into a kind of fertilizer. Is this acid capable of causing a fire? Or are the countless other chemicals in plants and animals be enough to prevent a fire from starting?
Obviously the latter is th... |
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Yesterday I was driving at night on an unlit road (nothing nefarious, I swear), and there was a truck behind me with a ridiculous amount of headlamps on, and catching a glimpse of it in my mirror it looked a bit like an angry animal. It got me to thinking, if there was an animal that could switch on head... |
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[Jaswinder](http://www.behindthename.com/random/random.php?number=1&gender=u&surname=&all=yes) lives in a world much like ours except that there is magic, and he has suddenly manifest it. He is able to at will draw on up to (at any one time) the equivalent of 8.9876e+19 joules of magical power (being 100... |
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I recently re-watched an awesome show - [Diebuster](http://en.wikipedia.org/wiki/Diebuster). At one point in the show, one of the characters uses Jupiter as a projectile, slamming it into one of the aliens, but to no avail.
I can't find a good picture of that scene for some strange reason.
Anyway, this q... |
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The story I'm writing has characters that speak a different language from the protagonists.
I'm thinking about building them a conlang (constructed language) but I don't know the best way to go about.
The world they inhabit is culturally and technologically and geographically similar to our own. That sai... |
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I am creating a fantasy world where a given race is mystically tied to the planet. Predominately this race will be earth-dwellers, quite happy and content to burrow underground, but I'd like some of the race to be happier in the sea. The world is very Earth-like, so it works as a good model.
I know that ... |
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I have a certain vision for a post-apocalyptic cyberpunk world in which civilization itself is collapsed, but technology and structures are still existant. 98% of human population is wiped out by a viral mutagen, of the remaining 2% a part that is immune against the mutagen, a part is sentinent mutant an... |
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Exactly as asked on the title, is there a way that a human, or at least, a species that appears outwardly human, could survive being pincushioned by arrows, at least for a suitably dramatic length of time (several minutes, the length of one pre-death monologue, maybe.)?
I would rather if the answer came ... |
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I posed a similar question earlier but was told maybe I should ask another one. I hope I am doing the right thing, so here goes.
The setting is a post-catastrophe Earth that is entirely or almost entirely covered in water, so naturally people live exclusively on big oil/tanker ships. For safety and commu... |
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Is there a theory, model, technique that could help when placing cities on a map, instead of placing them randomly?
I have an estimate of the population for a given territory so I know more or less how many cities I'm supposed to have but I'm not sure how I should place them.
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## Central Plac... |
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In a science-based futuristic world, individuals (soldiers) are able to become invisible **to the human eye** while keeping a decent amount of agility. What could be the different possible technologies behind such ability and what would be their downfalls?
For example, I'm thinking solutions could be:
* ... |
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In my world, I have a type of plant with a two-stage life cycle. The first stage grows into a structure that functions like a greenhouse that allows in most of the Sun's light but insulates against temperature. It does this to support the second stage, an extremely delicate type of flower which can only ... |
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**Setting**
This question is about a human culture, with conditions essentially the same as Earth's with technology roughly comparable to early middle ages. The climate is roughly Alpine, although the mountain is taller than any on Earth.
**Society**
I've been playing around with a culture that values el... |
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New here, so forgive me if I commit a faux pas or two
So I wrote a society that, never being wealthy or organized enough to invest in rail and road networks, stuck with beasts of burden, even as the rest of the world developed. I had the idea of camels or donkeys having piezoelectric shoes that generate ... |
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In the isekai genre of anime, it is a common trope for a person to be reborn into a baby's body while retaining their full cognitive abilities. Assuming they maintain full control of their coordination (balance and limb control), how long would it take for such a person to develop enough muscle strength ... |
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In a short story I'm writing, a non-tropical island nation has an economy centered around selling an oil made from a particular animal. The oil is special because it produces a light purple flame when burned. How would such an oil and animal be possible?
For extra clarification, the animal is a species t... |
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I'm writing a fictional story where someone from our time (the present), travels back to 1896. He has a lot of knownledge about science and electronics, so he can easily built some basic circuits, as long as the components needed have been already created or could be created with the technology of the ti... |
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If a planet, lets call her Shiloh, had no oceans or liquid water on the surface; Could it still have deep, vast ocean basins? Or would a dry ocean basin level out over time?
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## Yes
Let's expand on @L.Dutch's answer. Without water, what we have to work with is flora, wind, volcanism, and tecto... |
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The vampires in my setting have the ability to control human minds when looking them right in the eyes. While lots of them generally only use this ability to make humans forget masquerade-breaking things they saw or non-violently resolve physical encounters with humans, there are very few limits to what ... |
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An 18th century coachman, who really loves their horses and won't allow any harm to come to them, needs a mechanism to instantly disengage their four-wheeled carriage from the horses midride, setting the animals free (perhaps with the pole and parts of tack still attached), in case they spook, or the car... |
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I am considering how to implement faster-than-light (FTL) travel in a sci-fi setting without the attendant problems with causality. One of the ways I've been thinking about for this is establishing a **preferred frame of reference**.
[Per Wikipedia](https://en.wikipedia.org/wiki/Preferred_frame):
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> In... |
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I'm using as a means of "long-distance travel" the generation and exploitation of Einstein-Rosen bridges, through quantum entanglement of black matter in different points of the galaxy, as a way to control entry and exit points of travel.
I know I'm stretching a lot of theory by connecting quantum entang... |
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I invented a fantasy world which primarily consists of 7 Realms, six based on the six colors of the rainbow (the consensus is that indigo isn't really a color), red yellow green blue orange violet, with a 'Realm of the Light' in the center.
Each morning, the inhabitants of the six outer Realms raise thei... |
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I have a story where the setup is that, ~600 years prior to the story's beginning, there was an apocalypse of a magical nature that rendered most of the world uninhabitable. A few survivors from various places managed to escape to the one inhabitable landmass, an island roughly the size of Greenland. The... |
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**Closed**. This question needs [details or clarity](/help/closed-questions). It is not currently accepting answers.
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Closed 2 years ago.
The community reviewed whether to reopen this... |
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Could an animal realistically move around if it lacked knees in some legs?
For specifics, the animal for my world would be a tetrapod-analogue, having 2 large legs (with knees) at the back, and a smaller pair of knee-less legs near the front. The forelegs have a foot at the distal end, with a ball-and-so... |
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Winged jetpack comes with 2 set of fixed thrusters and a pair of foldable wings with adjustable aileron. (You put on the jetpack like a schoolbag)
Palm repulsors are heavy duty gloves each is equipped with a powerful plasma ejector that can deliver a constant force of max 100Kg of TNT up to 2 hours. (Bot... |
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Edited: I suppose the setting doesn't really matter.
Scenario: An earth-like planet in size and material and atmospheric composition experiences a phenomenon of purple light being the visible light at night when its two moons, one with a red surface and the other blue, both shine with equal luminosity, u... |
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TL;DR: I have solved aging and cancer with the power of handwaving and genetic science. All rejoice.
Yes, there is a question at the end of this all, but you have to read it for it to make sense.
In order to provide context for this question, I had to write a wall of text to explain the specific mechanis... |
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In my world, creatures evolved in the twilight zone of a tidally locked planet. Naturally, because there is little light, creatures either increased their light sensitivity or turned to other senses, the most common being their auditory sense.
I have originally thought of just larger ears but thought the... |
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I've been looking around the internet but I can't seem to find out how fluoride salts would form naturally. My end goal is for my planet to have a mildly high concentration of hydrofluoric acid pools, and my idea was to utilize the already-abundant amount of sulfuric acid to combine with fluoride salts. ... |
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I'm hoping that the following scenario is one of those "you'll never actually see that so don't bother looking for it" things Because Reasons™ but I want to look at whether, and how, it is *physically possible*:
The Larry Niven essay *[Bigger Than Worlds](https://en.wikipedia.org/wiki/Bigger_Than_Worlds)... |
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i mean, our firearms, in many ways, are depend on this fact - that we only have 2 hands. What would the weapon look like, its ergonomics and its qualities and properties and usage - if the use of 4 hands were envisaged? I'm more interested in firearms, not a melee weapon ...
1.How might look and be used ... |
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Would transport between settlements on Mars be similar to Transport between Cities on Earth?, well except no boats because no oceans.
so what would be the most practical mode of transport between these settlements, Railways?, Roads?, Overland Rovers?, Aircraft?, or Suborbital Spacecraft? What mode of tra... |
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I want to create a planet that has:
* Low gravity.
* Giant creatures (not quite Godzilla sized, but bigger than Dinosaurs).
* Human explorers should be able to jump incredibly high there, maybe even fly/float (with the aid of some sort of device?)
* Humans don’t have to be able to breathe there (I’ll giv... |
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Could a creature which lays amniote-like eggs evolve into a creature similar to modern amphibians? The creature would be amphibious, spending most of their time in freshwater, and coming onto land to lay eggs, which would hatch into terrestrial larvae, which, rather than eating a unique diet like real mo... |
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My idea is to have organisms that use [molten salt](https://en.wikipedia.org/wiki/Sodium_chloride) as their solvent in the chemistry of the creature. So what I was thinking to have the cells consist of [tungsten](https://en.wikipedia.org/wiki/Tungsten#:%7E:text=Tungsten%2C%20or%20wolfram%2C%20is%20a,as%2... |
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This question relates the same world discussed in this post: [Horseback Travel in an Unpopulated Pacific Northwest](https://worldbuilding.stackexchange.com/questions/194912/horseback-travel-in-an-unpopulated-pacific-northwest)
Two mounted patrolmen are tasked with navigating and policing a reimagined Coa... |
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Note that I ask about the longest possible tree and not the tallest possible tree.
There have been a number of questions about the tallest possible tree, and I wrote a detailed answer to one: [https://worldbuilding.stackexchange.com/questions/191008/would-a-small-low-gravity-moon-be-able-to-harbor-comple... |
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In the geological history of my planet, the plate tectonics resulted in the assembly of a kind of "ring supercontinent", that completely encircled a portion of the ocean and isolated it from the rest of the planet for a hundred million years or so.
It happened very shortly (geologically speaking) after t... |
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For my question I'm assuming that we're talking about colonies on the very biggest bodies that are 100s of kms in size. I'm assuming that by this point humans have become cyborgified/roboticized enough to run off electricity and not require a closed atmosphere or really care that there's low surface grav... |
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I am toying for a while with the idea of an [hysteretic](https://en.wikipedia.org/wiki/Hysteresis) space-time.
>
> Hysteresis is the dependence of the state of a system on its history.
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Though it could make for some interesting twists in the world, I am not sure up to which point it could be mad... |
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I had an idea for a creature in my world: the enchanced canine.
Basically, they were dogs, mostly German shepherds, that were used by a police organization in the United States. These policemen, wanting better fighting dogs, made a contract with a bioengineering company that enchanced the dogs. The chang... |
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I'm building a world, which takes place about 300 years in the future after an event in the near future, in which giant elemental monsters started to roam around the earth. These creatures are an average of 30 feet tall and have shapes of normal animals. They were resistant to conventional weapons and to... |
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From puppetsock's reply to [Is it possible to build a black hole (kugelblitz) gun?](https://worldbuilding.stackexchange.com/questions/159244/is-it-possible-to-build-a-black-hole-kugelblitz-gun), it seems like a black hole of 228 tonnes evaporate after just 1 second. And the lifetime of a black hole in ge... |
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(Note: this is similar to [is Cryomancy scientifically possible?](https://worldbuilding.stackexchange.com/questions/44449/is-cryomancy-scientifically-possible), but not exactly the same.)
In my story, I have "magic" that amounts to telekinesis powered by the user's metabolism.
It seems that heating objec... |
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**This question asks for hard science.** All answers to this question should be backed up by equations, empirical evidence, scientific papers, other citations, etc. Answers that do not satisfy this requirement might be removed. See [the tag description](/tags/hard-science/info) for more information.
So f... |
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Giant dogs aren't uncommon in works of fantasy. Sif from Dark Souls comes to mind.
[](https://i.stack.imgur.com/qVCIx.png)
What I want to know is: what's the largest a canine could realistically get, what differences would they need comp... |
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In some birds especially owls, we can observe a structure called [facial disk](https://en.m.wikipedia.org/wiki/Facial_disc), which is mainly composed of feathers and helps to direct sound to their ears. While being more common in owls, adding up to their asymmetrical ears to result in great hearing capab... |
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In my world there is an engineered species of changeling-like shapeshifters. Their lifecycle is similar to that of cuckoos (and the fair folk) of replacing human children with their own, who then run away into the wilderness once they reach maturity.
The original changelings would have spoken the languag... |
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The **Orion's Arm Universe Project** includes a description of what they call "**[To](https://www.orionsarm.com/eg-article/4802ab151e093)['](https://tvtropes.org/pmwiki/pmwiki.php/Main/PunctuationShaker)[ul](https://www.orionsarm.com/eg-article/4802ab151e093)['](https://tvtropes.org/pmwiki/pmwiki.php/Mai... |
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As far as it is known, **Flywheels** are extremely efficient in energy storage, with the best even able to replace even the strongest batteries. They are accelerated by electricity to extremely high speeds, maintaining a sizeable amount of rotational kinetic energy.
[. How might the mid-to-upper-level atmosphere of that planet be dangerously radioactive and full of airborne nuclear reagents, **without** it being the doings of an intelligent species?
**Edit.** I am aware... |
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I'm working on a roleplaying game in a medieval fantasy setting with a focus on crafting and I am having trouble visualizing how armor made from scales of creatures would be assembled; both for art and material list purposes. I wasn't able to find any good examples as animal scale isn't generally used fo... |
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Design for an Extendable Melee Weapon?
**Background**
I've been working on a RolePlay setting, for me and friends. The setting mostly uses energy weapons, and at the higher levels, anti-energy shields (Beam deflecting shields, or laser reflective materials). This comes with a trade off, leaving energy sh... |
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I want to make my dragon spew/breathe an explosive mix with gizzard stone fragments/shrapnel, more like a shotgun than the common flamethrower-like fire breath.
So is there any explosive chemical that can be reproduced biologically and be safely contained in the creature's internal organs? (I mean someth... |
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The planet is huge roughly four times the size of earth, with lots of hydrogen in its atmosphere (group A water in Hydrogen out, B water out.) it is also very humid. what do I do to have giant Storms in the sky with Fire instead of thunder? What would these storms look like?
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**Flame cloud def... |
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Is it possible for an organism to evolve a capacitor if the conditions were right (carnivore that stuns fish, living in complete darkness, etc.)? What kind of challenges would there be to evolve something like this? What fluid would it most likely be present in? I was looking at Wikipedia's page on elect... |
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Think of a species (ONLY ONE SPECIES) the individuals all live in the same environment, share the same sentience level BUT are divided into "A", "B" and "C" races which have different number of limbs, eyes, natural weapons, etc.
For example A has tentacles, B has bird legs and feet, C has horse legs, thi... |
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So, there are birdpeople/birdfolk in my setting. They're ~170 cm tall bipedal humanoids with a pair of functioning wings, slightly below the shoulders. They're covered with feathers, except for the hands and legs, both of which have talons, though smaller on the hands. Their necks are slightly longer tha... |
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Earth's deepest point, the Challenger Deep, is almost seven miles below sea level. By contrast, Europa is smaller than even Earth's moon, yet its oceans are anywhere between 40-100 miles deep! So the basic question is--would it be tectonically feasible for Earth's oceans to be as deep as Europa's? Meanin... |
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Imagine a creature much like ourselves that can control the usage of their own mind.
For example, a dying ancestor may tell some parting words which are so important that the individual explicitly saves them in their mind, with no way of the memory fading unless it is consciously 'unremembered'.
Another ... |
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I have an idea for an extremely crackpot engine design for a future society I may incorporate into my story.
What would happen is individual antihydrogen molecules injected into the center of carbon fullerene molecules using the combined electron clouds of the atoms to repel the antimatter into the cent... |
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Assume these homo super-dwarf aka fairy and homo sapiens come from a common ancestor, and somehow they evolved a pair of wings and can do vertical takeoff.
The average adult is approximately the size of a tennis ball and weights around 58g, they are mammal by the way so how can they hover at the same fl... |
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Imagine a dictator who owns a massive prison. The tech level is 12th-15th century, and the dictator has very few guards at his disposal. The prison already has all necessary resources such as food and water dispensed from [vending machines](https://worldbuilding.stackexchange.com/questions/132381/with-12... |
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So, let’s imagine a force of about 500 people, armed with what we would consider modern weaponry (or, more so, 1960s weaponry), are facing up against a force that outnumbers them at a ratio of 34:1, but with weapons more akin to the 1890s-WW1 levels.
The other force is planning on an all-out siege again... |
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I'm trying to create a planet which environment is not immediately lethal to humans, (reasonable oxygen level) however after closer inspection turns out not to be specially Earth-like.
One issues is its hydrosphere. Over 90% of planet surface is water (or ice). It's rather cold tidally locked planet, so ... |
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**This question asks for hard science.** All answers to this question should be backed up by equations, empirical evidence, scientific papers, other citations, etc. Answers that do not satisfy this requirement might be removed. See [the tag description](/tags/hard-science/info) for more information.
Prio... |
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Atmospheric composition:
* | 2% Trace gases | 58% Nitrogen | 26% Oxygen | 11% Argon | 3% Carbon dioxide |
Average surface temperature:
* 36 degrees Celsius
Surface gravity:
* 1.36x Earth gravity
Info regarding of altitude, pressure, and atmospheric density:
```
altitude pressure density
(meters) ... |
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Obviously, current oxygen levels should last us years, so we are talking about a long-term solution.
Also, in this hypothetical scenario, plants have stopped releasing oxygen but haven't stop producing organics, so the food is not a problem. I understand it's a far-fetched scenario, but I don't know how ... |
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I am working on creating a fantasy race called the Aemani. As they are part deer they are [unguligrade](https://en.wiktionary.org/wiki/unguligrade) bipeds (like a faun or satyr).
I am in the midst of creating their culture however I don't know how they would ride a horse, or even if they could.
Would ... |
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[](https://i.stack.imgur.com/RXe8y.jpg)
### Context
This creature right here is one of the decedents of placoderms that that transitioned from rivers to land. The got onto land during the Middle Devonian and remained isolated from all other land anima... |
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Essentially, I'm designing a solar system for form of alien life. For the sake of ease, the star is roughly similar to the Sun, and the habitable planet follows an orbit anywhere between Earth and Mars.
However, from what I've been able to research, it seems that a large amount of extrasolar planets disc... |
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So, bit of an unusual question, but here goes...
As I've read on other questions on the site, a creature gaining sapience would not automatically translate to a society equal to ours, and I believe it's safe to say that this isn't exactly a novice idea. Multiple films and TV shows show aliens, for one ex... |
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So I am in a sci-fi world where I am trying to figure out a system of super-national and multi-national organizations that would retain the independence of nations while also defining how colonization, trade, international relations and war can be performed and also how it can have the power to enforce i... |
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