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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.
Give... |
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So, the microstructure of abalone shells is 95% calcium carbonate, such as aragonite, tiles and 5% organic polymer that binds them together. This binding fails in a graceful manner, allowing the shell to take a lot of punishment before shattering.
This composite material is around 3,000 times more resist... |
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So, I envision a world that has forgotten it's *en route* to another galaxy -- it's been in transit for only a million years, hasn't even properly left its "home" behind (still stars in the sky, at least behind), but while a million years isn't very long as sublight intergalactic travel goes, it's a very... |
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Dunkleosteus terreli might be the most well known species of placoderm by general media. Having inhabited the devonian seas, this impressive predator possessed an unique four bar linkage jaw mechanism, which allowed not only for powerful bite, but also for a very quick opening, fast enough to essentially... |
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I am interested in world building of a alien biospheres, as is done for example in [Alien Biospheres](https://www.youtube.com/playlist?list=PL6xPxnYMQpquNuaEffJzjGjMsr6VktCYl) series. In this context, I would like to know some rule of thumb how to estimate number of animals living on certain area. I foun... |
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For a book that I'm working on I am plotting out various points in time to make sure my plot is following accordingly. I apologize in advance for the lengthy post. It is a fungus-like infection that spreads in a few ways:
* Animals infected with the disease tend to not display deadly symptoms but instead... |
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**Short question:**
which hormones should high contagious fungi spores produce to make their human host spread the joy and infection (by hugging and kisses) on early stages of infection, and become paranoid, irritable and bloodthirsty or suicidal lunatic on later stages of infection?
**Long story:**
Few... |
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I have a planet orbiting a red dwarf and, as expected, it is tidally locked to its star. I know that these planets will have a very significant temperature difference between the diurnal and nocturnal hemispheres, but I want to know how different it will be, that is to say, what will be the average tempe... |
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Assume an Earth-Clone, that has an axial tilt of 90°. How would the circulation of the atmosphere look like? Would there still be three convection cells?
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So the axial tilt doesn't actually influence the number of convection cells very much, afaik. It *does*, however, [affect their position](h... |
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I'm interested in the introduction of bacteria on Mars. If a small base were set up with attempts to maintain some sort of sterilisation protocols, but all the humans died on that base a) what would happen to the bodies and b) what would happen to the bacteria contained within the bodies themselves?
[... |
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Humans have come and gone. Their aggressiveness and pride have caused their own end. War has torn apart all society, engineered diseases pick them off one by one. The last remaining people have fled to the corners of the world. Some say they still live there, hunting and growing crops in primitive villag... |
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[Cross-linked polymers](https://en.wikipedia.org/wiki/Cross-link) are vitally important materials used all the time in modern life.
For example, the resins used in composite materials are usually some type of cross-linked polymer.
What type of cross-linked polymers could be made by people with access t... |
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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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I've decided to draw maps, on these maps, I planned on drawing regions which already have determined areas (ex. Region 1 has 30.000 km²), the problem is, how would a measure a region's area on a map? Some territories have some pretty wild shapes, with many islands, which makes it very difficult to measur... |
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I have a crew that need to spend a couple years traveling via spaceship.
Because it's inefficient to have to provide every passenger with living-space and rations, I'd much prefer if it were possible to put them in some sort of stasis for the duration of the trip. Though not by means of cryonics. I'm no... |
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I'm continuing to work on my [map](https://worldbuilding.stackexchange.com/questions/103879/could-i-get-some-guidance-on-this-map-in-progress), and one thing that's giving me difficulty is figuring out the geology of a region that I wanted to be similar to the Ethiopian highlands and African rift valley.... |
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Basically I'm considering the physiology of eyes and camouflage might look like on an eyeball planet; tidally locked to the sun so the sun is stationary in the sky. At any point on the habitable twilight-zone the sun would therefore be stationary somewhere near the horizon. The eyes might also be slightl... |
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I am not a writer nor an artist but I am creating a video game and I am looking for a realistic imaginary world based on science. I am looking for realistic data to support the strategical framework of the game that follows:
It is based on a company that wants to select $p$ locations among a set of $m$ p... |
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I am designing an alien species of organism (not necessarily intelligent, in fact, probably not). My current settings are these:
The female is very large (bigger than cattle, smaller than elephants), have strong, pointed mouthparts for skewering prey or enemies and are capable of sudden bursts of speed. ... |
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This question is not a duplicate of [this question](https://worldbuilding.stackexchange.com/questions/43958/what-would-happen-to-life-on-earth-if-the-planet-had-total-cover-of-permanent-cl). They're similar, but this one has one very large difference: only a large area has permanent cloud cover, not the ... |
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I have done research on blood and in particular the component adding color and transferring oxygen.
Hemocyanin is directly dissolved into the blood. This works for an octopus, but not a reptilian alien. Hemoglobin however is contained inside RBCs and very little is directly dissolved into the blood. This... |
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My WB society's motto is: **Education is paramount for the advancement of society.** A group of pharmaceutical companies have perfected a drug for children to young adults, ages 6 to 16, that allows for nearly side-effect free, extreme mental acuity, focus and accelerated learning. This society has chose... |
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**How could a civilization create a dangerous autonomous mechanical ecosystem that will not be overly dangerous to its creators?**
Militaries are expensive; military research doubly so. So what's a small colony from a small civilization supposed to do to defend itself? It needs all the resources it can g... |
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There have been a few questions on mobile plants on this site and even more on their intelligence, but one that has not been asked so far is related to the lifeblood of creatures: blood. Inside of Earth plants, the circulatory system is less complex, as the organism does not need to move. But surely if t... |
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This is a pretty simple question, but initial research only seems to provide the opposite end of the spectrum. What I'm wondering is if there are any known side effects of living in an environment with an increased amount of air pressure.
Say, for instance, humans colonized an Earthlike planet which had... |
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It is near future, Portland, Oregon, and the residents and neighboring farmers are sick of everyone moving there now that climate change has made it a (even more) fabulous place to live. In an extreme gesture, the entire city decides to build a wall around the city and neighboring farms, and (hand-waving... |
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You're in a group of colonists, headed to your new home on [Tau Ceti e](https://worldbuilding.stackexchange.com/questions/15364/resources-to-justify-long-distance-space-mining-missions). Due to some crazy accidents aboard the ship, the diverse flora that was brought aboard (for food during the journey an... |
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Related to the [this question](https://worldbuilding.stackexchange.com/questions/6335/how-to-avoid-objects-when-traveling-at-greater-than-75-light-speed-or-how-not) about not going SPLAT. That one was for conventional travel through space at high speeds.
Now I want to know about how things would work wi... |
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**Background**
I have considered rotating space habitats of various forms for my worldbuilding projects (i.e. cylinders, rings/torii, spheres) and recently discovered this intriguing design by physicist Pekka Janhunen <https://arxiv.org/abs/1806.09808>
To summarize, the habitat is a squat cylinder that i... |
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Okay, the time machine itself is science fiction. I've got some handwavium about transformation of Einsteinian equations and unconventional polarization of electromagnetic frequencies and so forth. Here I'm trying to conceptualize the support equipment for it and I want to keep that strictly true to know... |
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I want to create a world for a story: Charybdis - a world of high tides. Very high tides.
Tides that drag whole ocean around the world - or most of it - in a long cycle. It must lasts at least several months, if not longer. I want to make regular cycle of deluges and dry seasons to be dominant force on t... |
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Movement is relative, but I've read that an ex-NASA scientist has quantified the speed of Earth hurtling through space to be 1.3 million mph, using the Cosmic Microwave Background as a frame of reference ([link](https://www.businessinsider.com/earth-screaming-through-space-nasa-animated-video-2019-10?op=... |
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For the story that I am writing currently, it is set on a colonized planet thousands of years after machines wiped out most of the human colony that were established there, and would go on to form an ecosystem with other organisms since they depend on biomatter as fuel. The machines themselves have evolv... |
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**This question already has answers here**:
[What would be the energy requirements to run a world with an artificial sun?](/questions/207041/what-would-be-the-energy-requirements-to-run-a-world-with-an-artificial-sun)
(2 answers)
Closed 2 years ago.
Suppose there is no sun, how much total energy i... |
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While looking about for references on how to make a strong, prehensile tail, I found [ProjectApex's answer to that exact question](https://worldbuilding.stackexchange.com/a/213191/87100). The solution is to make the tail a [muscular hydrostat](https://en.wikipedia.org/wiki/Muscular_hydrostat), a bodily s... |
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Basically, assuming you have all of modern human knowledge about smelting iron/steel, and the technology level you have is approximately bronze age, what would be the most effective approach to turn iron ores into usable iron tools? Specifically, the approach that would result in the highest quality resu... |
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How long could a planet or moon survive if it had an Earth mass black hole within it?
Hypothetical primordial black hole formed soon after the Big Bang, or low mass black holes formed later by some other hypothetical process, could have masses lower than stellar remnant black holes which should have at l... |
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Let's say there is a sapient species around the size of an t-rex, they weigh on average 6000-8000 kg and are omnivores whose diet is mostly composed of plant matter, but with some meat. They are around as advanced as late neolithic or early bronze age humans.
Would a village populated by 100 of the creat... |
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I was thinking of a universe with 3+1 dimensions, in which the spacetime near a massive body is curved. If this universe was empty of energy and matter then the spacetime geometry would reduce to that of Special Relativity, but even in the limit as the distance from a massive body increases and the speed... |
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First post (reposted and more focused). Thanks in advance. I'm working on an epic fantasy series where our future-Earth has gradually stopped spinning about its axis (though still about the sun). Assume magic/future-tech to allow for these assumptions: (1)Assume humans/animals/plants survived and are now... |
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I'm writing a story about the supernatural, except with as few "explained by magic" elements as possible. In the case of vampires, I want them to look as similar to humans as possible while being able to see at night as well as we can in the day. This rules out slit or hyperenlarged pupils. A taptum luci... |
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Respirocytes are an artificial analogue of red blood cells. Tiny sapphire capsules that can absorb oxygen in the lungs and release it in the capillaries. From the capillaries to the lungs, they, in turn, deliver carbon dioxide. Only respirocytes are hundreds of times more effective than ordinary red bloo... |
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For my project there is an environment with a very rapid fire regime due to the usual stuff like a dry seasonal climate and dragons. While most animals escape the flames by running, burrowing, or flying away; there is one that simply takes the heat.
It’s a massive Xenarthian that looks like the love chi... |
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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.
Does... |
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Inspired by [this answer:](https://worldbuilding.stackexchange.com/a/150920/16987)
Suppose there is an enormous dragon sleeping underground (let's not worry about the biomechanics of how such a creature could exist). One day, it wakes up, shakes the earth off its back, and takes off, leaving the planet a... |
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So, in my setting, telekinesis is divided into two sub-fields:
* **Soft telekinesis** allows for precise manipulation of objects but doesn't pack a punch. Newton's third law is negligible for this type.
* **Hard telekinesis** is a quick burst of force that can accelerate an object in a certain direction,... |
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2 informational references for Alcubierre fields can be found at the end of this question.
Warp-lanes aren't a novelty in science-fiction. Space ships can use a specific route to go through a Galaxy at often superluminal speeds. Alcubierre found a way to use current physics of relativity by Einstein and ... |
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I've been working on [a system with a habitable moon](https://worldbuilding.stackexchange.com/questions/127226/feasible-star-planet-moon-combo-did-i-miss-anything-that-makes-this-system) (Moon A) for a story, and I'm now trying to populate the other moons around the parent planet. I'm considering placing... |
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I have already reviewed a few questions about the feasibility of a radio communicating creature. Like these:
* [How would organic EM transmitters/recievers be different than our mechanical ones](https://worldbuilding.stackexchange.com/questions/4474/how-would-organic-em-transmitters-recievers-be-differe... |
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What characteristics (compare those of a mountain goat foot: good grip on rocks, doesn't slip off, etc) would the foot of a dog or a wolf need to have to be useful in rocky settings such as mountains (but not very steep ones) and rocky deserts? What about the pads, claws, general roughness?
This creature... |
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Is it possible to use thermal byproduct of daylight operation to power night time operation of volatile computer storage?
In my setting, a moon-like moon with almost no atmosphere has one of its sides (the far side) populated with nodes powered with sunlight (solar flux of said planet is around $1247 W/m... |
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When I was a kid, I conceptualized a post-apocalyptic story entirely starring Barbie dolls. One idea I had about how they would live and get around involved transmission towers, or power towers. Imagine something like [this](https://en.m.wikipedia.org/wiki/Transmission_tower#/media/File%3APylon_ds.jpg). ... |
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A year ago, I asked a couple questions about a world I was building where the all the ecosystems in a planet were designed from scratch by a galactic consortium of species ([1](https://worldbuilding.stackexchange.com/q/39059/6270), [2](https://worldbuilding.stackexchange.com/q/39117/627), [3](https://wor... |
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I'm imagining a situation that we can see a star change color periodically:
1. A star and Earth orbit around a black hole
2. The star is very near to the black hole so that it has high orbital speed, while the Earth orbits the black hole at far away
3. As the star has a high orbital speed, when the tange... |
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Rana sylvatica, the only amphibian found north of the arctic circle, has a very unique survival strategy: it pumps its body full of glucose and hormones just before freezing so that ice crystals don't cause irreversible damage to the creature's body. Then, when it comes time to thaw, the frog thaws slowl... |
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Something that isn't quite like a thesaurus. For example when writing fantasy it would be nice to have a list of established fantasy terms, partly so that I don't plagiarize other writers (words that are common enough to probably have been used before like dragonborn or fel magic) and partly to become in... |
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## Setting
A [binary planet](https://en.wikipedia.org/wiki/Double_planet) system consisting of two terrestrial planets (hereafter Alpha/α and Beta/β). The system [barycentre](https://en.wikipedia.org/wiki/Barycenter) (C) is between the two planets; for the sake of this question the exact position is vari... |
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In the movie [The time Machine](https://en.wikipedia.org/wiki/The_Time_Machine_(2002_film)), humans drill the moon and destroy part of it.
[](https://i.stack.imgur.com/7KxlW.jpg)
So this made me wonder, if we destroyed the moon like this... |
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I was thinking I would have a race and at the most basic level it is a ground covering moss. As it encounters other colonies of itself they will join together to form one contiguous colony while keeping the genetic diversity of both colonies. Once any given colony of moss reaches a certain (probably larg... |
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I'm currently planning for my own new story, and in one point in time there will be a city somewhere on the Atlantic Ocean which has to have the space resources necessary to sustain for around 1 billion people, the survivors of a global catastrophe. There is no possibility for people to live elsewhere, a... |
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This question has to do with the same storyline I proposed in [How would government change if everyone died by the age of 25?](https://worldbuilding.stackexchange.com/questions/29199/how-would-government-change-if-everyone-died-by-the-age-of-25) (although now that I've written a few short chapters, the n... |
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Let's say I have a roughly humanoid race (similar size, form, activity level, etc.) that spontaneously generates any energy that they need via Magic. However, they still need to eat some materials in order to grow and repair their bodies.
Assuming that their biology is mostly the same to humans, other th... |
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A mutation or virus (we do not know) has suddenly modified humanity by making people live indefinitely though cycles of aging (to 70 yo) and then rejuvenating (to 3 yo).
* This does not make people immortal: they are still vulnerable to typical accidents, we just rule out the death by aging and illnesses... |
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I've wanted to work out a world where summers are extremely hot except for two weeks in the middle of summer. Winters would be extremely cold except in the dead of winter when there would be two weeks of spring like weather.
Can a planet have unusual weather changes due to its interaction with other astr... |
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Bob escaped from his exploding spaceship in the world's most ghetto escape pod - an airtight metal box, with only some respiratory gear ($\text{O}\_2$ tank, $\text{CO}\_2$ filter) as company. Now he's floating in open space, awaiting rescue. Disregarding that people die *fast* in space due to exposure to... |
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**Closed**. This question needs [details or clarity](/help/closed-questions). It is not currently accepting answers.
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Multiple large moons around a terrestrial planet is something that is seen in science fiction a lot, but is not really easily possible. An alternative is to use smaller moons but have them orbit closer.
With this in mind, I wanted to get the exotic look of multiple moons with large angular sizes but with... |
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Assuming the skies are clear of suspended particles, what color should they be at mid-day if viewed with human eyes?
The planet is larger and twice as massive as Earth, with a nearly identical atmosphere composition but a far higher surface pressure. This implies a thicker atmosphere with more scattering... |
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Suppose you have what it takes to build a Ringworld, or at least a Culture Orbital, but instead you make a tiny scale model of Earth, with a neutronium core to make the surface gravity match, a membrane to prevent atmosphere loss, and whatever else it takes to make surface conditions (other than curvatur... |
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What would be the specific long term and short term outcomes of slashing wounds in microgravity?
The scenario is that a normal adult is slashed with a knife in a microgravity environment. Assume standard atmospheric pressure and normal atmospheric composition. Assume that the injury cuts through skin and... |
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I have a character who cannot smile, frown, express anger on their face, or make other expressions but can still move facial muscles to blink, eat, blush, puff cheeks and still feels emotions like happiness. Aside from the expressionless face they are completely normal and able with no other issues. I've... |
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I'm trying to engineer an Earth mass planet built initially out of pure silicon dioxide (silica).
So basically, imagine a glass sphere slightly larger than Earth somewhere in the Goldilocks zone, preferably closer to the outer region.
Keep in mind that this planet has no moon, so there is no tidal heatin... |
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Probably this is question is related with things like snakes recovering their limbs or an anatomically correct [naga](https://worldbuilding.stackexchange.com/questions/44703/anatomically-correct-naga/190324#190324) or lamia or [medusa](https://worldbuilding.stackexchange.com/questions/34221/anatomically-... |
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So I found a question on this site that talked about the possibility of having a habitable planet in a stable trojan position (a planet located at Lagrangian point L4 or L5 of a much bigger object). And I thought it was cool, and decided to make it the homeworld of a spacefaring civilisation of my worldb... |
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**Closed**. This question needs [details or clarity](/help/closed-questions). It is not currently accepting answers.
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Being new, this is my first question. I've read some other posts that gave me valuable insight, but I still have some questions.
First, some specifics:
* Star: red dwarf. 80 x jupiter mass. 3 billion years old, after the violent flare phase.
* Gas giant: 7 x jupiter mass (edited from 12, so its not a bro... |
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This question has been asked in similar forms on this site already with some good answers like here:
[What Color Can the Sky Be?](https://worldbuilding.stackexchange.com/questions/13279/what-color-can-the-sky-be)
[How could the sky be orange in a breathable atmosphere?](https://worldbuilding.stackexchang... |
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So, we've gone off to another star system and decided to build a Dyson bubble--a continuous statite, supported by radiation pressure, surrounding a star--with a surface gravity of 1g to live on.
Now, clearly, the bubble has a total surface area of hundreds of thousands of Earths--plenty of space! Except.... |
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Before picking specs, I need to ensure feasibility. Only one of the planets need be Earth-like; in fact, I would prefer if the other planet were rather small and dead, like a moon. The orbits will be eccentric enough to produce tectonic strain. Obviously they'll be tidally locked.
What would the tidal bu... |
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Assuming the wars of the far, far future aren't either fought exclusively by unmanned spacecraft/robots/drones or in ways so incomprehensible to us that comparisons are meaningless, the only foolproof way to increase the power of an infrantryman's weapons are to make the switch to laser and energy weapon... |
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I'm trying to work out some really basic biochemical details for cold-world aliens whose bodily fluids are based on liquid methane rather than water. I figure they have to be hydrogen breathers, because you won't get free oxygen on a world with methane oceans! But that means that their metabolism would p... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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Closed 7 years ago.
* 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 ge... |
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Those who have read my recent questions posted here will have noticed that my questions are often related to hardcore biochemistry, atmospheric processes etc. While I have had some good answers to parts of these I would like to solicit suggestions as to what other Q+A sites and/or forums might be better ... |
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So I want to send a ship to Alpha Centauri very quickly - by this, I mean less than 5 years. This means that the ship will have to accelerate at 50-100 $g$ or even more. But we don't want to turn our astronauts into pancakes, right?
Is spending long time periods in perfluorocarbons saturated with oxygen ... |
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I want to create a world set on our Earth but with humans shrunk down as much as possible to allow a huge population.
As the population increases they genetically modify their bodies to be as small as possible while retaining human intelligence. They do **not** [replace their bodies and minds with machin... |
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[](https://i.stack.imgur.com/Zsx3H.jpg)[](https://i.stack.imgur.com/2a4cn.jpg)
This world’s average surface temperature is 42°c. Has a day length of 12 hours and 5 minut... |
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I have the two largest towns of this smallish Kingdom's populations, but the first place the protags of my story are going to encounter is going to be village or hamlet sized. Most of the resources I am coming across seem to focus on the big cities, which is nice, but not needed for another few chapters.... |
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I started thinking about Alderson disks. They are usually portrayed with large uninhabitable sections on either side of the habitable zone.
Why not just build the habitable zone, and save materials? (As if that were really a concern for Alien Space Bats building a freaking Alderson Disk....)
Well, the th... |
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Start game
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You wake up in a forest, naked and lying on your back.
As you stand up you realize something has been watching you, it seems to be a dog, a very big f\*\*\* dog, a wolf!
The wolf, bigger than you'd ever expect rushes in eager to attack you.
6 meters between you and the... |
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The user can manipulate fire in many ways, and to a certain extent, he can also manipulate electricity. The fire he uses is special and can reach temperatures above sun, but the average temperature reached by its flames is "48 times hotter than normal fire." He can increase his power gradually over time ... |
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This will be a question that I am fine with having less realism in. I was thinking of a weapon, like a spear, that can go at FTL (*faster than light*) speeds. To be clear, the spear is FTL due to propulsion (*that is where the realism fades*) rather than being a miniature **Alcubierre Warp Drive** (*that... |
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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/123426/edit).
Closed 5 years ago.
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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 1 year ago.
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