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[Question] [ Essentially in my world I have a large and mountainous kingdom, but I have always envisioned them wearing leather armor with cloaks etc. Is there a valid reason I could state for why they don't wear metal armor? Because I feel like if the option is there, for the time period my world mimics, they would b...
[Question] [ I have designed the "blueprint" of an spaceport. I know that in Earth solar energy is 1.200W/m^2 approx., but my spaceport is in the space (no atmosphere). **Information** - My blueprint has 60 solar panel blocks. Each block has 100m^2 area, for 60 \* 100m^2 = 6,000m^2 total area of solar pane...
[Question] [ The story is as follows, a group of people (around 2000 from all around the world) leaves earth and lives on a different (earth like) planet for ca 6000 (earth) years. The planet is about 0.8 times the size of earth and has a similar gravity in the range of 0,8G to 1,2G. The planet has seasons, a year is...
[Question] [ The world as we know it crumbled down yesterday. All stock exchanges were turned off. Capitalism as we know it failed. Answers to how and why this happened are outside of this question. It just happened. New leader emerged from the chaos. He has full trust of army and managed to, uh, "get things back to ...
[Question] [ Let's suppose anti-gravity/gravity-manipulation/telekinetic technology is found in the near future. It allows to move large ships (thousands tons) into space from the surface of the Earth with relative ease. However it comes with nasty side-effect - any electronic device within "field" is short-circuit...
[Question] [ So we discover an alternate Earth, inhabited by humans, whose technology roughly corresponds to that of our late middle ages (think 13th or 14th century). Surprisingly, those people do not believe in magic, nor in fact have a concept for it. Things either happen because people do them (you have to sow in...
[Question] [ Let's take 4 or 5 survivors living on a more or less friendly island. They have a cosy camp, a source of water, some food and stone tools. They are here for several weeks/months and know they will probably never been rescued. They're thinking of long term survival and one of the survivor find iron ore in...
[Question] [ What law of physics needs to change in order to create nuclear (proton-neutron ["crystalline like mesh"](https://en.wikipedia.org/wiki/Crystal_structure)) plate armour ? [Answer] # You need a [Neutron Star](https://en.wikipedia.org/wiki/Neutron_star#Structure) This kind of thing only really happens in...
[Question] [ In the last few years there have been major improvements in the area of autonomy of the car: Mercedes, Google, etc. Driverless cars are less prone to accidents and such but the car repair industry **depends** on drivers making mistakes (collisions/accidents). What would happen to all these body shop work...
[Question] [ I have been working on a futuristic story where information can be stored and used with a black hole. This is a highly advanced human society that has accomplished interstellar space travel via both worm holes and warp drive. My question is this: **How might a race utilize a Black Hole for information st...
[Question] [ In humans, males and females have a (theoretical - in practice there are more women) sex distribution of 50:50 in any given population (which is large enough to account for the law of large numbers) due to its biology. * Suppose, this ratio was 3:1 males:females, so that we now have 3 males for every 1 ...
[Question] [ Let's say that I'm creating a world game that lasts for 1000 years (or more). The game involves players obtaining talented leaders, e.g. George Washington (military), Albert Einstein (science), etc. The problem is, they have only a "normal" life span of say, 80 years, even though the world lasts from say...
[Question] [ So humans ended up all dead in a hundred years, and then after some time humans appeared back on Earth, but know nothing about the previous humans. They found records and blueprints of things like ships and guns and computers. Could they build them in such a way as to have interactive holograms, but age ...
[Question] [ There is a construction fleet that has turned up on earth, to prepare it for extraterrestrial visitors (it's the new galactic place to be). In order to assist the locals (us) in understanding what is happening, the construction fleet has a Wikipedia page that is broadcast around the globe sends a signal ...
[Question] [ Basically the world I am designing gets **really** cold in the winter (coldest month of the year averages -75C in some inhabited areas). Because of this people dont really like to build small more isolated settlements and prefer to stay in cities. Over time these cities got huge, on average each city has...
[Question] [ Mana is the life energy that courses through a metaphysical circulatory system in the human body that allows it to function and perform its daily tasks to keep an individual alive. At the center is the human heart, which pumps mana through all corners of the body in the same way that it pumps blood. The ...
[Question] [ The question. Let's say a pterosaur like Q. Northropi survived as an isolate and thrived as apex predator in New Zealand for millions of years. Without much evolutionary pressure its species remained biologically stable. Then the Maori arrived around 900 AD, and were able to, in something like 200 years ...
[Question] [ Say that hypothetically, I wish to grow plants under the ocean. I construct a large glass dome and house the plants in a greenhouse contained in that done. How deep underwater could I plausibly have this dome before, before sunlight wouldn't reach it anymore? Could a series of farms based on this design ...
[Question] [ I know it sounds kinda stupid, but I’m trying to create a really ominous figure that would always watch the player in this a hypothetical video game that I’m writing with my dad. We both agreed that having a huge 3 headed mechanical bird with a dead city on its back would be pretty creepy. The hypothetic...
[Question] [ Long story short: a cultural tradition of this (late medieval/early renaissance-ish) civilization is to put their deceased in a casket/boat/raft, and float them out into the ocean. Their belief is that they're sending their loved ones off to the afterlife, and at some point they float into the supernatur...
[Question] [ In [another question](https://worldbuilding.stackexchange.com/q/194648/47324), I asked how airships could be made more viable. The first (and so far only) promising solution I came up with is to increase the density of air. In the real world, air (on Earth) is composed mainly of nitrogen (~80%) and oxyge...
[Question] [ Numerous science fiction works feature super soldiers wearing power armor (powered exoskeletons fitted with armor plates that provide varying degrees of protection, strength, speed, endurance, and other capabilities), such as Halo, Warhammer 40k, Fallout, etc. Sometimes, these suits of power armor are pa...
[Question] [ Individuals are born with mana, which accounts for their life force and has a hand in determining the strength of their spells. Mana level and composition is determined by a person's genes, which they inherit from a mix of their parents. There are three factors that decide magical power: 1. Maximum rese...
[Question] [ In my medieval-fantasy world, there’s a secret civilization with modern technology. A “powerful” dragon accidentally came across them and they became good allies. The dragon was introduced to the concept of aircraft and it wasn’t long until she decided to ride one. The dragon shrunk into a more humanoid...
[Question] [ Fantasy writers tend to prefer forms of combat that predate guns, because they are more showy, and they involve close and long-duration combat with an identified adversary instead of shooting at distant specks and twitch-spraying bullets in close quarters. Fantasy writers also like to use settings where ...
[Question] [ I'm a witch flying on my broomstick over 14th century England. I've got regular human eyes, and my cruising height is 500 metres or up to a kilometre, depending on the weather. Assuming it is a moonless night, around 3 AM. My goal is to find my house (which is inside the city walls), with minimal risk of...
[Question] [ I am creating a fantasy world where on one continent there are humans, dwarves and gnomes. All 'species' can interbreed (much like Neanderthals and Homo Sapiens), thus they need to have close similar ancestors for it to make sense. The planet is like earth in terms of atmosphere, gravity etc. Is there an...
[Question] [ Mostly what it says on the tin. If a spaceship, let's say about 200 meters long and 100 meters wide (made of modern materials) was approaching Earth and slowing down (say from 100 km/s to 3km/s), how far out would it be noticed? How clear of a picture could something take of it? Is is possible it wouldn'...
[Question] [ In My world of PD there are two distinct moons, Aurie is a big cream colored moon on a 32 day cycle and Chi is a smaller rust- colored moon on a 20 day cycle. Can somebody help me figure out how often they would be full at the same time? I'm looking for maybe an equation to figure out how often they over...
[Question] [ **Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers. --- 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...
[Question] [ I'm creating a hardcore survival and simulation game on an alien planet. Plants and diseases evolve, adapt and change the environment, and you set up buildings, breed plants and create machines to help survive in a volatile ecosystem. This being a harsh game, I wanted to make death really matter, but at ...
[Question] [ One thing that I've been thinking about, for one of my sci-fi worlds, is the main race that inhabits it. They’re a small mammalian species, about three and a half feet tall on average, evolving on an ocean planet, with islands containing diverse ecosystems upon rich, high altitude mountain ranges. The do...
[Question] [ I am currently designing a highly intelligent species for a sci-fi project I am working on. They are quite similar physically to prehistoric salamanders or similar amphibians, but I am having trouble coming up with a reason they would evolve arms longer than their legs and becoming hexapeds (so they can ...
[Question] [ Would a ship made out of a single piece of wood have any advantages over a normal vessel? **Context:** A particularly clever/mad mage has discovered how to make a living ship by binding a dryad into a particular shape instead of an ordinary tree. Such a vessel is self repairing, and capable of directing ...
[Question] [ To make it short, time-space shenanigans transported everything in a 60 kilometers circumference around an old space-based particle collider to the year 1855. The particle collider was in geosynchronous orbit with Earth, in a region of space that was heavily packed with space junk: Pieces of old ships, d...
[Question] [ Assume soldiers of the future need to fight person to person underwater, at depths from 30 to unachievable today, like 1-2 kilometer. Today, underwater warfare between scuba divers, involves conventional, gunpowder weaponry, modified to be effective in water (like Russian APS). But what about future? Wi...
[Question] [ Imagine a busy port city with hundreds of ships in a medieval setting without gun power. The city is not heavily walled, and is located on a remote corner of the world, away from the jurisdiction and protection of the Empire. The city is a bit smaller than Amsterdam and it's northern, western and eastern...
[Question] [ While similar to other questions they mostly focused on what impacts required in the past to keep airships as a popular air transport method today, this question is about how to make airships the dominant method air transport method ASAP. What I want to know is what changes can a single man make to make ...
[Question] [ So the story goes that in 212 BC Archimedes used bronze mirrors to incinerate Roman ships as they approached the harbor at Syracuse. This along with other ingenious inventions aided in keeping the Romans at bay until they were able to scale the walls of the city while it was distracted during their annua...
[Question] [ **Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers. --- 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...
[Question] [ So I'm creating an original world with a number of creatures, and original peoples. One of the peoples has a two-speak language. One element, the base of the language, is based off of local mythology, the second a form of sign language. The base of their language would be stories about creation, or expla...
[Question] [ I was wondering if you could possibly make a form of time measurement that would apply to a planet in a galaxy and then another planet that is ~20,000 light years away. I want a unit of time that, for both planets, will be a whole number. Also here's useful info about the first planet (the planet I've be...
[Question] [ Let us develop an industrial electric motor from first principles. [Alessandro Volta](https://en.wikipedia.org/wiki/Alessandro_Volta#Early_battery) developed a battery whose ingredients were copper, zinc, seawater, and imagination. These ingredients have been available since prehistory; his [voltaic pile...
[Question] [ A sandcrawler is is a tracked vehicle about 40 meters long, 20 meters tall, and 15 meters wide. It has a thick outer hull for protection from the elements. It has eight sets of tracks, four abreast forward and aft for support. It is designed to operate in hot and sandy desert environments. In the Star Wa...
[Question] [ My story happens in the near future on the research station located on [Callisto](http://www.space.com/16448-callisto-facts-about-jupiters-dead-moon.html), Jupiter's second largest moon. The mission has just started when the crew discovers an abandoned alien station. Whoever made it is dead or gone long ...
[Question] [ *Meta note: This is not about a dome over a city, so this is not a duplication of those questions. Instead, this is about a building that is a dome in shape.* For precise reasons unbeknownst to outsiders, China has found an impressive expanse of solid bedrock, and has decided to build a massive dome. The...
[Question] [ In Star Gate, the Ori are notorious for keeping the tech level of their planetary subjects at or under medieval tech levels. It has been said (still looking for the exact source) that if everyone lived like an American it would take the combined resources of **4 Earth's**([link](http://persquaremile.com/...
[Question] [ I want to find out what's going on in another star system, but I don't want to go there. How feasible is it to just build a big telescope and take a look? Scenario: Earth does not respond to communications any more, and nobody who enters the system leaves again. Is it physically possible to build a teles...
[Question] [ OK, so humanity is going to space, and they are going to take farm animals into space, not only humans on earth value meat, but humans in space do, too. However, they don't want to waste precious resources such as artificial gravity for the farming, so instead of adapting the space ship, they decide to a...
[Question] [ **If mankind in ~ 1000 years would still use chemical propellants for handheld weapons and their ammunition, how would they improve, given the following:** * There has been no dark age, but constant research. * Energy weapons exist, but they are not as effective / too big/heavy to be hauled around by peo...
[Question] [ If a human is kidnapped by an alien vessel and taken to another planet - and, for the sake of argument, let's assume that the alien life-form lives in a completely different environment from Earth's. Assuming, of course, that this alien race is far more technologically advanced than us, is it technically...
[Question] [ In many a sci-fi, the villains (and sometimes the good guys) have glowing lenses attached to their gas masks to help both identify them and provide a useful target for the protagonists. The obvious reason any (kinda) moderately sane military would do this was stated before hand, identification. However, ...
[Question] [ In waterworlds where people live mostly under water or have access to bodies of water how is violence perpetuated in close quarters? Projectiles lose their power really fast making them unviable. Bladed weapons are also slow. Explosives tend to hurt person deploying them as well. Grappling could be an op...
[Question] [ I have a mountain range that separates two places that certain people will want to go between fairly regularly. Right now they have to travel around or over a mountain range to do that. I've been thinking about ideas of how to make traversal easier and quicker and one possibility that occurred to me was ...
[Question] [ In a story idea I have, there is a massive, stationary beast, with teeth the size of houses, a body as large as a continent, and an unfathomably large mouth (don't ask how it sustains itself, nobody knows or cares) Common sense dictates that humans would avoid this thing at all costs. And yet, there are ...
[Question] [ My story takes place on a dark, dusty planet full of canyons and tunnels. The atmosphere is compositionally similar to Earth’s, but it is too dark and cloudy for humans to see properly. The humans colonizing this planet in the far future are at war, so they build their best soldiers advanced combat suits...
[Question] [ **Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/215189/edit). Closed 2 years ago. This post was edited and su...
[Question] [ What battlefield/tech conditions would necessitate the use of trench warfare in a modern or semi near future setting? One thing I was considering was the significant advancement of railguns/AT guns that would effectively shut down heavy armored assaults. Past a certain point the incoming shell is just co...
[Question] [ Imagine that you're the admiral of a fleet of warships in orbit around Saturn. You need to capture targets on Titan, the largest moon. (This could also be applied to, say, Venus or one of the gas giants. This is an example. EDIT: this has been pointed out to me as false. This could work on Earth or Titan...
[Question] [ **Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/195269/edit). Closed 2 years ago. [Improve this question](/po...
[Question] [ I know that brain size is less important than structure and that human babies' brains are 27% the size of an adult's, but humans give birth to large brained babies. As a result, humans can't support the weight of their own heads for a few months, mature slowly and have a large pelvis. If a species had sh...
[Question] [ An unmanned, AI-controlled, terraforming ship arrives at an earth-like planet (i.e in the goldilocks zone of its star, with a magnetosphere, an atmosphere, plenty of liquid water, earth-like gravity, etc.). Despite this habitability, the planet has not developed any life at all. The terraforming ship set...
[Question] [ So I've finally found something that has brought me to this rabbit hole of worldbuilding. I've been doing some future planning for an expansive subterranean facility that would require heavy cargo transport and have been looking at options for such. One of the concepts I'm considering is a large crane sy...
[Question] [ **Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers. --- 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...
[Question] [ **Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it can be answered with facts and citations by [editing this post](/posts/178064/edit). Closed 3 years ago. [Improve this question...
[Question] [ **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. Due ...
[Question] [ I am currently trying to write a story about a World War 3, but the major issue I am having is the presence of nuclear weapons. I want the war to constantly escalate to a point where it becomes a total war to setup a future story/idea I have in mind. However, the threat of nuclear weapons (mainly ICBMs a...
[Question] [ I'm thinking of a predatory creature that lives deep inside large caves. Because this environment is so dark, the creature's eyes have disappeared through evolution since the creature relies on echolocation rather than sight. But the thing is that this creature has a large frill around its neck with smal...
[Question] [ I have searched for a while now, but I cannot find a definite answer. A character I am writing has been captured by the antagonist, operated on and released, now completely mute. I've looked around for a bit to find a plausible way to explain him becoming completely mute, but cannot find one. Simply re...
[Question] [ If you found out a way to produce a smooth icy surface on an ice moon like Ganymede, Enceladus, or Callisto, what kind of challenges would someone face if they tried to start ice skating? I figured you'd have problems with traction or staying glued on the surface in a low gravity world. Would this be pos...
[Question] [ **Background** We know about the can-and-string telephone. [![enter image description here](https://i.stack.imgur.com/qJOmg.png)](https://i.stack.imgur.com/qJOmg.png) There are various claims about the maximum distance over which this is effective. Let's say 100 feet is possible without too much loss and...
[Question] [ In my research on how I could get elves to live the time spans I wanted them to live, I came up with this solution: *Every elf generates while still developing inside the womb of the mother copies of his embryo which get stored somewhere in his body. Each time the elf reaches its equivalent of 60 years (...
[Question] [ An island nation has a lot of coastal territory and has become gravely concerned about the threat of global warming. They've decided to fix this by launching reflective satellites into orbit -- similar to [China's man-made moon](https://www.esquire.com/lifestyle/a23937900/china-man-made-moon-launching-20...
[Question] [ **Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers. --- This question does not appear to be about **worldbuilding**, within the scope defined in the [help center](https://worldbuilding.stackexchange.com/help). Closed 5 years ago. [Improve this que...
[Question] [ **Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it can be answered with facts and citations by [editing this post](/posts/125834/edit). Closed 5 years ago. [Improve this question...
[Question] [ I am writing a short story in which a character is ejected out of an air lock in a space ship. He quickly re-enters (disregard how he does this) and the chamber re-pressurizes, but he is exposed to space for about nine seconds, and without oxygen for about 12 seconds. Given that the plot then has him eng...
[Question] [ Would it be possible for a race of [crustacean](https://en.wikipedia.org/wiki/Crustacean) humanoids to live as nomads in a desert environment? I want them to have crab-like faces and crab-like skin with humanoid bodies. Would they survive in that environment? What would they need to survive both biologic...
[Question] [ **Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it can be answered with facts and citations by [editing this post](/posts/94579/edit). Closed 6 years ago. [Improve this question]...
[Question] [ In a land where the majority of people have multiple personalities, how do the personalities distinguish themselves? Whenever they change personalities, they have an immediate need to disassociate themselves from their alternate personalities, and it is not practical to change clothes. Not only that, but...
[Question] [ I'm posing this question in the terms of inbreeding depression and hybrid vigor. It probably depends on the size of the inbreeding population, and I'm making supersoldiers in a pre-industrial society, so I think I would be satisfied with 100-300 men... er, that would make 200-600 people. It also seems to...
[Question] [ On its mission to explore new worlds and seek out new civilisations, the spaceship 'Exciting Undertaking' came across a planet of seemingly unadvanced aliens. Following their First Direction (forbidding interactions with pre-wrap-capable aliens and *totally not* modelled after anyone else's rules of inte...
[Question] [ **Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/69643/edit). Closed 6 years ago. [Improve this question](/pos...
[Question] [ We don't have a pill that can serve all of our nutritional needs, but we do have soylent, which supposedly takes care of the nutritional needs for a person ( and is reported to taste quite bland). There are a plethora of dry pellets in the pet aisle that are specially made for each type of animal consumi...
[Question] [ Your company has just been contracted to develop a purpose built AI. The purpose of this AI is to control a mining station that will be anchored within an asteroid belt. The space station will be equipped with refining and construction facilities, docking bays for transport ships, and rudimentary defense...
[Question] [ Let's just take antimatter off the table right now. As I've learned recently, it's hard to make, expensive as hell and even more volatile, and you can never get more energy out of it than you put into making it, making it the Samsung Note 7 battery of future energy solutions. With that out of the way, w...
[Question] [ **Closed**. This question needs to be more [focused](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/61512/edit). Closed 7 years ago. [Improve this question](/pos...
[Question] [ **Setting:** * modern technology (read early XXIst century), modern humans. * new virgin planet which needs infrastructure. * millions of survivors, but still little by standards of global economy. **Aim:** rebuilding the standard of living so that it is almost comparable to the first world countries of ...
[Question] [ On the planet of the Aves, birds have evolved to dominate the Earth instead of mammals. Of the thousands of species in this world, both on the [ground](https://worldbuilding.stackexchange.com/questions/51622/planet-of-the-aves-quadrabirds) and in the [water](https://worldbuilding.stackexchange.com/questi...
[Question] [ Following the general trope with Silver/Golden Age Superheroes' relationship with society, law enforcement, and government we can get the following: * Superheroes may or may not work directly with law enforcement (officers, detectives, DAs, etc) * Superheroes, for the most part, aren't part of government...
[Question] [ How would I change the evolution of humans to result in horns on humans as a result of reproductive fitness, instead of social fitness. Meaning, NEITHER "Horns are sexy", or some strange infection. Note: <https://worldbuilding.stackexchange.com/a/14907/6812> > > A predatory creature with claws and large...
[Question] [ I would argue that ants are one of the most dangerous, effective and successful creatures on earth. But as we know they are not the dominant form of life. They also vary through-out their many species; some have [potent venom](https://en.wikipedia.org/wiki/Paraponera_clavata) while others even have [acid...
[Question] [ I'm planning on sending a colony ship on an extended, multi-generational voyage to a distant star. My colony ship is an oblate spheroid, 2km long on its long axis and 1km across on its shortest axis. It's built using near future technology, with power generation provided by fusion plants and thrust via a...
[Question] [ **Background** Tea has a magic to manipulate and control the *attention* of those around him. With this power, he could, for instance, hold or disrupt conversations, influence one's sensory perception to some extent, or possibly become a hitman.. But Tea wants to be a hitman like no other. Imagine you...
[Question] [ **Closed**. This question is [opinion-based](/help/closed-questions). It is not currently accepting answers. --- **Want to improve this question?** Update the question so it can be answered with facts and citations by [editing this post](/posts/30902/edit). Closed 4 years ago. [Improve this question]...
[Question] [ The [language](/questions/tagged/language "show questions tagged 'language'") tag challenge did remind me something which always baffles me on "Star Wars" franchise: Why on Tatooine would intelligent androids use beeping for communication? So I call you, fellow Worldbuilders to help me create more plausi...
[Question] [ How would Roman Warfare have changed if they actually had legendary 'flexible glass', and it was cost-effective? [Flexible Glass (vitrum flexile)](https://en.wikipedia.org/wiki/Flexible_glass) It's an unbreakable, and I mean **literally** unbreakable, glass. Assume that it looks and acts like normal Roma...
[Question] [ I am using the same androids featured in [this question](https://worldbuilding.stackexchange.com/questions/26300/how-would-the-widespread-creation-and-use-of-androids-affect-warfare) **Android Details** * Roughly 10 times stronger than the average human * Possibility to reach maximum speeds of 64 kmph * ...
[Question] [ First, is it possible for a planet hit be a meteor to shatter into two pieces?. Then, can the two pieces remain in orbit? Especially, can they develop a sort of co-orbit around each other? [Answer] I like [TimB's answer](https://worldbuilding.stackexchange.com/questions/14673/can-a-planet-hit-by-a-me...
[Question] [ Suppose this world suddenly has night creatures that only appeared at night and disappear at day. With the world's civilization at risk of total destruction by randomly appearing night creatures, they build a floating city using the local unobtanium that allows it to float and they have it fly counter to...
[Question] [ [Similar to this question](https://worldbuilding.stackexchange.com/questions/8471/would-people-be-polygamous-in-a-gender-switching-world), but with major differences. The set-up is that past-humans implemented, through biological engineering, the ability to switch between male and female in everybody. Ho...