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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.
On e... |
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The scenario: an alien crew has a shuttle landed on Earth in the 1980's. Their main ship is extremely damaged and beyond reach somewhere in the Milky Way. Their shuttle cannot escape Earth's atmosphere. They are in an unpopulated forested area to avoid encountering the locals, which would be both a galac... |
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## Prelude
**Prelude TLDR; A fleet of ships is passing through our galaxy, stopping off at particular stars and causing small dips in the light from stars.**
This is related to a couple of other questions (and a little suspension of belief to make it fit the story I want). The other questions are [refuel... |
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Imagine you had a flat earth scenario, in which the world is essentially a giant disc floating in space (I know that in reality any such world would be pulled into a sphere by gravity, but for the sake of the question assume that gravity just pulls "down" instead of towards the center of mass). Now direc... |
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So here's the scenario, a mad scientist has just managed to take over the continent on his campaign for world domination (which continent I will leave to your imagination but for simplicity lets say north America or Europe). While his armies fend off any outsiders trying to intervene he must now consolid... |
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Unlike mammals, reptiles lack gluteal muscles and instead have enlarged caudofemoralis muscles to extend the hindlegs. The humanoid legs, on the other hand, rely on the mammalian gluteals in order to function
Is there an alternative muscular structure that allows for humanoid legs that are moved by the m... |
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My setting is a standard rotating ring space station. I want some action to happen in the core, specifically for the hero to take down a "hypercom" system that is housed there. I'm trying to understand what else would be happening/functioning in the core itself.
This station is on the frontier of known h... |
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In my world, I have these things called 'voids', for lack of a better name. These voids are absolute nothingness.
What I'm having trouble with is what they'd look like from the outside. No light = black, no color = white. Light is needed for color, so black *should* trump white, right? Whould it even loo... |
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Nuclear fission rockets are becoming obsolete and have been superseded by the more efficient antimatter engines, which have nearly 100% efficiency and do not produce pollutants.
I'm wondering this: in a space battle that takes place within the solar system, is there any place for nuclear powered spaceshi... |
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Trying to figure out how much a 1 foot tall fairy would realistically weigh using these 2 guidelines
1. Fairies are just scaled down humans.
2. Their bones are not hollow because their flight is assisted by magic.
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For uniformly scaled down humans (as opposed to real life short humans), result... |
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In my world, ten is an important number that shows up frequently. In the solar system my world belongs to, there are ten other planets beside it, and there are ten months in a year.
I know next to nothing about astronomy, but I wondered if it were possible to have people on my planet be able to see in e... |
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I am interested in events that would so radically change Earth (for the worse) that it would be near uninhabitable for humans. The event may or may not be deadly to humans, but the world it leaves behind should be a very hard one to live in.
Note constraints:
* Anthropogenic events must be based on curre... |
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Please bear with any confusing explanations – this is my first question on here.
I’ve started building a fantasy world with the rough geography and technological advancement of late 14th –15th century Europe. I've attempted to research resource production in this period, but I've been unable to find an a... |
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What would be the hypothetical conditions for an Earth-like planet to have tundra or taiga as dominant biomes?
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Taiga [is the largest non-oceanic biome](https://en.wikipedia.org/wiki/Taiga) on Earth. But if you want it to be even more prevalent, take your pick:
1. A thinner atmosphere unable ... |
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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.
An a... |
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I have a number of intelligent alien species with a high number of limbs (from 6 up to 18) some with radial symmetry and some bilateral, in most cases the creatures can crawl using all limbs but when doing task the hind legs (3 to 6 depending on limb number) become the legs supporting their weight as the... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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You are asking questions about a story set in a world instead of about building a world. For more information, see [Why is my question "Too Story Based" and how do I get it opened?](https://w... |
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## The setting: 27th Century Alpha Centauri system
From everything I have seen, it is generally accepted that future space combat might not do very well with individual fighter-craft (similar to a modern F-22 Raptor but in space). In this narrative series, individual fighter-craft are a thing but they ar... |
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I’ve recently been playing a alien game with various alien species. After playing for a bit, I wondered whether or not a 6-inch tall intelligent race could exist.
I can already see some major disadvantages, one being the complications of requiring the necessary energy to power the body, especially the br... |
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[Repost to condense question down] For a science fiction world of mine I am considering using a type of microscopic organism that is able to generate energy as it goes through its lifecycle, a life cycle so fast that a group of them would be in a constant state of reproducing, decaying, and producing fue... |
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In a future world that is obsessed by not repeating the so-called errors of their fathers, there is a backwards Olympics, or Scipmylo.
All the usual disciplines are featured in reverse where it is possible to do so.
**Examples**
Catching the discus.
Dodging the javelin.
Low jump.
The easiest to measure a... |
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**How realistic is the trope that wounds received in a virtual reality (VR) transfer to our own?**
Examples: In the Matrix (movie) and Neuromancer (novel), cuts, scrapes, and bruises seemingly jump from immaterial to the material world.
Does this vary by VR type? Current VR technology doesn’t seem to tr... |
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On my alternate earth, elves originally evolved their phenotype (pointed ears) in the forests of Africa and migrated to other forest biomes afterward. After settling down they developed the racial differences we see in our world today. Darker skin near the equator, monolids in the east, etc. But all elve... |
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I'm writing about a small desert planet (about the size of pluto) that humans can live on. Is this possible?
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So as a simple answer no.
The diameter of Pluto is only 2,390 km across. Just for comparison, that's about 70% the diameter of the Moon. And it's a fraction of the size of the Earth; ... |
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In my fantasy pre-industrial world pollen production and plant reproduction has been disabled by some sort of curse.
The curse has a limited geographical span, but the region affected is very large and without bordering countries that are easy to reach. There is navigation-based commerce with other far-a... |
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You've traveled back in time 65 million years, with no way to return. What evidence can you leave to ensure future humans will know of your existence?
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This is very dependent on the technology you have available.
Given enough tech my approach would be retroreflectors on the moon. Build in as m... |
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So in a world where giant rock and metal golems 'spawn' naturally. These golems are the kind with a power core hidden inside their bodies, their body and limbs are held together by invisible mana threads naturally with the core's help. The golem consumes mana to move which is why they are a bit on the sl... |
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A caveat I will begin this question with is this: this system MUST be entirely organic. In fact it must be EVOLVED. Therefore Ghost in the Shell or Metal Gear-style nanocomms or cranial implants are a no-go, because they rely on man-made technology.
With that out of the way, here's my idea. We already kn... |
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(This question is quite similar to [How do you prove you're from the future?](https://worldbuilding.stackexchange.com/questions/12348/how-do-you-prove-youre-from-the-future))
I am an average person in the year 2016, living in, say, the USA. However I suddenly get transported back in time to 300 BC, to Pe... |
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A while back I answered a question about galactic economies with a semi-joke suggestion - wishes granted by an [Elder Race](http://en.wikipedia.org/wiki/Elder_race). I'd like to explore that further with the fortnightly challenge.
Background:
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> The E'kan'se are a race at least a million years old. The... |
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The world of Pandemonium is a world in another universe where humans may exist, that is gravitationally connected to Earth in our universe. Over the course of history since the big bang, these universes have periodically collided, transferring organised matter from one to the other, including humans... a... |
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Needlessly long names aside, how would this weapon work?
Made from scratch with junk scavenged from a 21st century world, post nuclear apocalypse. Assume nothing was specifically preserved, only the knowledge of our protagonist(yours).
I want a projectile weapon that uses anything you can fit into it(I a... |
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The idea for this animal is it filters through the sand to catch small insect-like creatures that are 2-6 inches long. I'm thinking of giving it a sieve-like pouch of skin at its throat that filters out most of the small grains of sand. I'm also thinking that maybe it could have a separate track for the ... |
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I ask this because I’ve been looking at alien designs for inspiration and on rare occasions found peculiar bone structures. The hexagonal rib cage in particular intrigues me. We know for one that honeycombs are the optimal shape for storage and are quite sturdy due to their geometry. What’s interesting i... |
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A science-fiction portal has been set up between Earth and the Moon. It uses a fold in space, so travel through the portal is effectively instantaneous. Initially there is an airlock to prevent Earth's atmosphere rushing through. Explorers and colonists move back and forth through the airlock.
Now comes ... |
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So, I am modding a game where the distance in pixels between star systems DOES matter on how the game calculate stuff.
We currently have a cool looking sub-way style map, with a lot of things in arbitrary places and shapes, unfortunately this caused a lot of gameplay bugs.
So I was looking around for exa... |
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This is something that confuses me with amorphous characters, monsters, robots etc... How do they compute when their particles don't have a fixed form? They are in a sense modular robots only taken to an extreme in size and number. Such a robot can freely transform, reassemble and other things. Take the ... |
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The [whomping willow](https://harrypotter.fandom.com/wiki/Whomping_Willow) is a fictional tree from the Harry Potter series of books. It is a magic willow that can move its branches to punch people who come close to it.
[](http... |
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So, a group of people have just been transported back to early 14th century England, and have angered a band of noble knights. Their armor looks like this.
One of my characters, Tim, received a hand grenade (which he was told was holy)... |
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The Humern empire is vast, unbelievably powerful and (in certain matters) brutally authoritarian.
One such issue is that of reproduction. In order to ensure that all subjects of the Empire remain part of the same species all breeding must be done either by taking a randomly chosen fertilised egg from a R... |
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**Background**
A colony of humans has settled on a remote planet where there is little to no sunlight, but there is a plentiful amount of earth metals. E.g.- Iron, aluminium, Titanium, etc. There are high speed consistent winds that make it ideal for harvesting electricity from wind (speeds of 60 - 100mp... |
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Human have begun colonizing the solar system using the ablative laser microwave drive, our next target is Proxima Centauri and inbetween there is basically nothing except dust and occasional asteroids which is entirely avoidable even with blindfold. What can be the reason to install plain windows onboard... |
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Suppose human beings have evolved markings covering the face and hairs. The cells contain a colony of bacterium capable of producing multiple arrays of visible light. Each bacteria reacts differently to a variety of chemicals secreted from our sweat glands. This complicated mixture of chemicals is contro... |
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I have a city on the edge of the sea and an ancient forest. The forest was protected for generations by local rulers but current ruler get bribed by foreign guilds to allow logging. The trees are old and huge and the water for transport is near so the guilds are reaping huge profits allowing to continuou... |
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You are stranded on Earth as it was ten thousand years ago. You have access (say, through a brain implant) to all of current human knowledge. Assume that basic survival is no issue.
Starting from scratch, your task is to create a rod, out of any material you like, with a length of one meter. The length m... |
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Is it possible for nanobots to become so integrated with a creatures biology that they could be transferred via the creatures reproduction and passed on to future generations? 'Synthetic Biology' looks promising, but it did not cover inheritance of traits.
Here are some links on Synthetic Biology:
<http... |
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Given a world with with absolutely no access to saltpeter (a key ingredient of gunpowder), and a wide-spread society at a medieval-level of technology, how long before this society would reach a non-medieval, Renaissance-type level of technology?
**Background**
1. No magic, although there may be "wizards... |
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Any ant-keeping geeks out there? I know what it's like to keep ants and they are quite fascinating, I was wondering if there were giant ants (their gigantism is due to high O2 levels) could they be domesticated by humans (who are evolved suited to the atmosphere) similar to how we domesticated dogs? I kn... |
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There seems to be a trend with the oldest civilizations (Civilizations being urbanized societies with a government and social heirarchy) starting around river valleys surrounded by desert; the Egyptians, Sumerians, and Harappans as examples. The issue is, they are all located around a hot desert climate.... |
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In my story, there is a character that is capable of using magic or an ability that allows them to "teleport" as long as they are in contact with the ground or the area that they want to use it on with at least one hand.
For example, in the middle of a circular arena 100m in diameter, as long as they are... |
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There is this great and dangerous forest in this world, way more bioproductive than anywhere on earth. The climate is humid subtropical, with cold but not freezing winters. There is plenty of fruits, nuts, herbs, roots and even some wood (palmetto) to be eaten in every season, even in the winter. There i... |
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I want to create a world were soil mining is a major industry. Imagine a vaguely Earth sized world where almost the entire surface of the planet is under, ocean, ice caps or is a hot or cold desert with nonexistent or very poor soils.
Soil or soil like organic matter does exist, but only quite deep under... |
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In my conworld, the inhabitants have futuristic technology and use armour that is made of primarily wood but will absorb bullet impacts and even armour-piercing rounds. It is cited as being very fire-resistant, though after enough time has elapsed it will burn through. What would be the conditions requir... |
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In my universe, humans nuked themselves in a war so thoroughly that the Earth has been rendered uninhabitable. As a result, they have to leave Earth and find a new home. They briefly tried to settle Mars, but were driven off by hostile native Martians they had neither the numbers nor the energy to fight.... |
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In my pre-plastic world there is a killer who removes unblemished skin from their victims and replaces it with a non-human 'skin', so that one can't tell the replaced skin from the remaining human skin.
**What is the best candidate for the replacement material?**
Ideally, it should fulfill the following ... |
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When developing a medival fantasy realm, especially one with no known healing and restoration magic, one may need to develop the people's understanding of science and medicine. A unique example of this is in Patrick Rothufuss's "A Wise Man's fear", where someone from an altruistic organization called the... |
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Would it be possible to make a crude scale mail out of oyster or some other mussel shells. If so how effective would it be? Do I need to invent some kind of super tough oyster for it to work?
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Real shell armor does exist. How practical it was is unknown however.
The breastplate of tula was ma... |
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My world is covered in a black stonelike material which is similar in structure to coral, being that it's highly-porous but not formed in the same way. The (non)water on my world, which is (currently) trisilane, can flow through the material with ease, and I have the idea that it flows underneath the sur... |
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### The kingdom itself
We are talking about medieval era.
We have a kingdom that is established on a [large desert](https://worldbuilding.stackexchange.com/questions/55052/constructing-a-desert-area?noredirect=1&lq=1).
Desert tend have low precipitation and high temperatures, this makes it an inhospitabl... |
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**How big could an empire using World-War II equivalent technology become on a very large world?**
**Setting:** Handwavium-based-artifact by a Kardashev III+ civilization, or perhaps a simworld created by AI researchers in the (not-so?) distant future. We're talking about a [1-AU-radius world](https://w... |
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Here be the dragons, here be the elves, here be the humans, here be the trolls. I get the basic, but I am torn apart:
**How realistic does the fairy tale world have to be for average 12 year old reader?**
Recently I did read a really great book "Dark Lord: The Teenage Years/ The Early Years" from Jamie T... |
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I showed a draft of a short story I wrote to some friends and got a very derisive comment from the chemist in the group.
According to him the chemistry just isn't possible.
I'd like a second opinion.
The short of it:
It's the year 2970 and humanity has finally cracked the FTL drive and starts to colon... |
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**Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers.
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**Want to improve this question?** Update the question so it can be answered with facts and citations by [editing this post](/posts/3676/edit).
Closed 6 years ago.
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The scenario: in September 1985, almost everyone abruptly disappears. Humans, domestic animals, carried/worn possessions, and vehicles currently in motion, vanish, while everything else stays as it was. (I don't know whether there is an accepted term for this kind of setting; if not, I'll use the one I j... |
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There is an Earthlike planet inhabited by Earthlike lifeforms including beings that are human for all practical purposes. The primary visible human civilisation is roughly equivalent in technology to Ancient Greece in the period 200 BC - 100 BC. However, the god-emperor-like semi-secret rulers of the wor... |
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How could the effectiveness of radar, heat seeking, or laser guided weapons be reduced during a battle between a monster the size of a 7 story building and the military of a small country.
The monster is purely biological, and has no paranormal powers or abilities, and would die quickly if hit with moder... |
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This Fantasy World has very large monsters, intelligent humanoids, expansive unique biomes, ect. While I was making my fantasy world I realised how hard it would be to hide all of this from humans. I was thinking of a few ways this could work out, maybe the world is on another planet, maybe during this t... |
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Nothing with mass can reach the speed of light because the closer to the speed of light it gets the more mass it has tending toward infinite mass as it approaches light speed & the more mass it has the more energy needed to accelerate it any further tending toward infinite energy as it approaches light s... |
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>
> The storyteller sits down. He has a tale to tell, a tale of a village
> that was suffering a drought. A tale of the desperation of the
> villagers. The desperation that led them to seek the help of one of
> the cruellest of tricksters, a Narrator. A tale, of how the narrator
> was one which was ... |
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I understand that some non human animals build structures that they innately know how to build, such as how birds innately know how to build nests, and spiders innately know how to make webs, and beavers innately know how to build lodges.
Could a land animal evolve to innately know how to build a boat? I... |
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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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Closed 4 years ago.
[Improve this question](/po... |
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So, a council of wizards decided that all should bow to their rule. That, it turns out, is a thing wizard councils did a lot. This lead into a certain degree of disagreement, which in turn resulted in the exchange of increasingly large fireballs and generally propelling matter into the stratosphere.
So, ... |
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Thinking about the shape gets pretty weird.
So my species has a more or less horizontal posture, pretty much a small sentient raptor. They can assume an 'upright' position, but only in the sense of a parrot.
They would of course have some kind of personal furniture for sitting elevated above the ground, ... |
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My idea for a creature within my fantasy story is that of a creature which floats through the air like a living hot air balloon.
It would do this through the intake, storage and regulation of gases within its body alongside its body temperature.
Its appearance is that of a large blob varying in size from... |
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In a fictional world a young civilization is struggling for survival.
Round about a century ago, it broke up with the core-society that was just beginning to establish itself on an inhospitable planet. The hiving off was accompanied by a war, involving heavy losses. Meanwhile the war is over, but there ... |
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My question is as stated above: if a planet is tidally locked to its sun, how would the people on the surface, assuming it's habitable, be able to tell time? What devices would they be able to use? Obviously a sun dial is out of the question.
I am also curious as to how they would develop a concept of ti... |
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What I am imagining is some sort of gargantuan beast that encloses a star with its monstrous jaws and then feeds off the rays released by the sun to power itself.
I am curious what kind of creature would be able to 'devour' an entire star (typically the size of ours)
What adaptations would it need in ord... |
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I have a world with 9 year days. That is, the day-night cycle here lasts 9 years, where ours lasts a mere 24 hours.
Very similar to a tidally locked planet, except the habitable belt moves. The species that have come to live on this planet have evolved to instinctively migrate west to avoid the night. T... |
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**Setting:**
We have alien-constructed stargates connecting different solar systems to each other, but otherwise it is a hard sci-fi universe with only known-possible technologies. We have fusion drives. But no warp drives, artificial gravity, or powerful shields.
Our protagonist is suspicious that one o... |
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In the Cold War the adversaries had huge amounts of nukes, a readiness to deploy these nukes and a second strike capability that assured that in a nuclear war both sides would be destroyed (mutually assured destruction, a.k.a. MAD). The question is to come up with a different system that doesn't involve ... |
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In my world (that takes place on an infinite plane), there exists an empire (let's call it Usotuhr) that is hell-bent on establishing human hegemony, or at the very least a human foothold, in the world. Due to this, they have launched a series of colonization programs that they call "The Manifest destiny... |
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I have a country, inspired by Edo era where for 2000 years the people lived in a hierarchical society arranged in below classes:
1 Aristocracy - Ruling class, negligible part of population
2 Warrior class - ~8% of the population, they either
* Work in military / law enforcement
* Work privately as guards... |
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In the (relatively new) *Star Trek* movie *Into Darkness*, we see Dr. Bones and Captain Kirk in a world composed mainly of red plants. Obviously these are just eye candy with no real basis behind it, but I would like to go further.
***What conditions would be necessary to have plants red in color? Blue?*... |
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The imagined scenario is of a small city built inside of a chasm that draws most of its water from an aquifer or underground river. The place and time in which the scenario takes place is Earth and roughly around the year 2100 A.D. While surface cities enjoy the advanced technology that one would imagine... |
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We all know that the key to worldbuilding is designing the right kind of the toothpaste tube. Terra is enthusiastic about fossil fuels, plastic, single-use wastemaking packaging, but this world I am building is not.
Fossil fuel/plastic isn't hardly a thing here. Canvas carrier bags. Wood furniture. Wooll... |
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I am looking to write a story where part of the [Atlantropa](https://en.wikipedia.org/wiki/Atlantropa) project goes through. Now I know about all the issues with it: the soil is covered in salt and unusable, it raises sea level in other places, makes existing coastal cities landlocked…
But my question is... |
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Scenario: in the not-so-distant future, someone(s) crack the code to the human mind. Essentially, humanity now has the power to treat the human mind as computer files - copy, delete, modify - all in the hands of a skilled professional, of course.
I'm thinking less like [Altered Carbon](https://en.wikiped... |
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For an alternate Earth I am trying to develop a type of flying creature which poses an unusual threat model for the unaware explorers wandering in their habitat: when the creature is flying above 10 meters of height and does its business, its droppings can knockout a human who happens to be with their un... |
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My story, set in 1990, has secret societies of immortal beings (vampires, werewolves, elves, leprechauns, etc.) living amongst the human race and trying to survive while remaining a secret. One idea about this world that I've had for ages is the concept of "grades" of magical blood, both in the immortal ... |
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An odd question, yes, but a question I am asking anyway. I have a group of feral cats that lives in a cave system. They've lived down here for generations, and survival of the fittest weeded out the builds that were unlikely to survive. Question is, could cats sustain their basic needs, off of only what ... |
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The telekinetic in question seems to have fantastic line of sight telekinesis and even great out of sight telekinesis being able to even manage "having a sense of feeling" to said things using his powerful imagination (he's quite the maladaptive daydreamer) however he can't move or manipulate things he d... |
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I want to help people to verify they're from future (if they are, of course). For this I publish some facts/numbers on my website, dayly or weekly or whatever, so that a time traveller can remember numbers for the next week and say them to whoever wants proof.
The requirements for such numbers are the fo... |
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Inspired by [this](https://worldbuilding.stackexchange.com/questions/165692/consequences-of-an-earth-size-object-hitting-the-sun) interesting question-- let's say that the universe was just really, really out to get a particular star, such as our sun. Is there a perfect cocktail where a mass significantl... |
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I'm devising a political system for a novel I'm working on, but I'm not sure how to name its parts. I'll give some context first and then get to my question.
* The story is in a middle age context
* The continent contains 6 roughly equivalent "kingdoms", where "kingship" is hereditary
* Kind of like Mala... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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This question does not appear to be about **worldbuilding**, within the scope defined in the [help center](https://worldbuilding.stackexchange.com/help).
Closed 4 years ago.
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I have a character who is, for lack of a better term, a Monster Hunter. She's physically fit, has a pretty high pain tolerance/is generally pretty durable, and is skilled in various forms of hand-to-hand combat. The problem is that she's also Not Very Big- 4'11, *maybe* 135 lbs soaking wet- and while she... |
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How would one go about repurposing a small cargo ship, no more than 50,000 tons, to run on an alternative fuel source/propulsion other than oil? And what alternative source would work best for propelling a ship that size while meeting the following requirements?
* The ship must be convertible to alternat... |
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If an expert of some kind travels back in time to the 14th or 15th century with modern tools and machines that don't require power to work and if he were to past on the knowledge of modern technology to a group of experts from that timeline, could they build an inline engine for use in vehicles and aircr... |
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Below is a diagram showing transverse cross sections of skulls representative of the two subspecies (A and B) of the Trilateral\* species. **Is it plausible that such obvious differences – noting the rest of their morphology and physiology is essentially identical – could be found within the same species... |
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A group of ships I've made are supposed to be modular in design with each modular hull segment being self sustainable both in terms of power needs and crew upkeep (oxygen, food, water, etc.)
I've been split between having the ships house massive reactors, with one or two (for redundancy) in each segment,... |
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