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In some star clusters, the stars are packed as densely as a light year apart or less. Many clusters do not appear to have black holes in the center, though they remain relatively stable in their orbits and longevity.
Assuming a cluster about 100 light years across, and planet(s) capable of supporting li... |
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I read a blog post explaining why interstellar travel is terribly impractical. The short answer is that stars are far away and travelling that far takes a very long time and ridiculous amounts of energy.
Anyway as a part of explaining the distances the blog gave examples of distances and one of them was ... |
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I'm working on [a comic](http://beesbuzz.biz/d/cat-lewi.php) which is essentially alternate-history fiction, and a big upcoming part of it involves the formation of the Chicxulub crater 63 million years ago. As I am a stickler for accuracy where things don't actually matter, I was hoping to be able to po... |
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In my scenario, human civilization was blinded by some cosmic event analogous to the [Tower of Babel](http://en.wikipedia.org/wiki/Tower_of_Babel). They are plunged back into the stone age and will begin to redevelop civilization
Is it possible to develop a civilization of only blind people? there are no... |
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There is a common sci-fi trope, that if there is a war in space, you should have planetary defense in place to protect you from intruders from space. But: is it plausible?
Let's give you this scenario: There is a second Earth (Earth B) which is currently at the same level of technological development as ... |
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Is it possible for a planet's moon to always rise at the same time of the night? And in this way be used as a timekeeping device? What if there are two moons?
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It wouldn't qualify as a "moon" *per se*, but an object placed in the [L2, L4, or L5 points](https://en.wikipedia.org/wiki/Lagrangian_... |
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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.
Some... |
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I noticed that when it comes to the idea of humans going extinct, and how human civilization could be detected by future civilizations, a lot of the ideas for how human civilization could be detected seem focused on things like finding the ruins of buildings, or finding other non living objects made by h... |
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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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**Want to improve this question?** Update the question so it focuses on one problem only by [editing this post](/posts/174711/edit).
Closed 3 years ago.
[Improve this question](/po... |
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In the future, humanity has discovered countless worlds, some filled with life and others not.
Likewise, they discover another world that is habitable, they study its various ecosystems, it’s various creatures, and many more. However, one day they discover a vast plain covered in pillars, upon further e... |
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Assume that average Joe dies in a zombie outbreak and is revived as a zombie pretty much immediately. How strong could that zombie be, assuming that:
* Zombification is done by "taking over" the brain, meaning that the zombie moves by transmitting signals over the same neural paths as a live human. It's ... |
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***A large comet is quickly approaching my fantasy world. Its impact will spell doom for all life on the planet. Fortunately, there are mages on this fantasy planet who possess a magic capable of shattering the comet. But, magic isn't free, energy has a cost....***
At first blush you may think I am askin... |
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As far as I have been able to determine, the majority of life reuses the same plumbing for reproductive and digestive/excretory systems. In fact, [the anus is believed to be derived from the male gonopore](https://www.sciencealert.com/scientists-are-trying-to-figure-out-why-you-have-an-anus).
This is see... |
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I want to change the biology of one human being via hand-waving to allow this individual to have abilities similar to a [gray wolf](https://en.wikipedia.org/wiki/Gray_wolf) - focussing for this question on an enhanced nose which should be able to be [roughly 14 times as receptive as a normal humans nose]... |
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**The Scenario:** Airships are awesome, but in the real world airship design is greatly constrained by the problem of lift. It seems like this, above all else, is what makes the elegant and compact ships of steampunk and fantasy unviable. Balloons need to be enormous to carry adequate mass. Steam engines... |
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Suppose we have a [Branching Timeline paradigm](https://worldbuilding.stackexchange.com/questions/67346/how-to-test-a-time-machine/67368#67368), in which time travel into the past creates a new timeline. Is it fair to assume that any probabalistic events which might occur might be very different to what ... |
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I am trying to create a planet for a fantasy role-playing game where the equator is an impassible region of ice. Ideally, I want to find a science-based solution to this and not have to resort to explaining it away with magic. Here's what I am trying to create.
1. Planet has seasons. (If there are ways t... |
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Slenderman is unarguably the most iconic creation of the early internet. It has led to games, stories and even books. But is his design evolutionarily possible? What evolutionary pressures would lead to the slender figure and abilities of the slenderman?
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Humans are already basically Slenderma... |
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We all know what the minotaur is and what it looks like, a buff man with the head and tail of a bull. But could this creature evolve? Could it even exist? If a Minotaur could exist, what environmental pressure would lead to its evolution?
A list of all of the Anatomically Correct questions can be found h... |
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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.
Whil... |
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**Setting:** Modern day Earth, no special technology advancements.
**Situation:** On day, in a relatively populated American city (the specific city is unimportant...the purpose of this point is that it's high-visibility), an apparent nuclear explosion occurs and absolutely levels several blocks.
Video f... |
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There is a creature. Let's call it a Blop.
Blops are fairly simple creatures: They consist of a tough, flexible outer skin and then an inner structure that is (essentially) organs and tentacles floating in goo. This gives them a remarkable versatility, as they can literally flip end-to-end within their o... |
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In the movie "Elysium" there is a luxurious micro-nation called 'Elysium' that is based on a large orbiting space platform, that is only obtainable for the super rich elite. Someone hacks the computer so that everyone on earth is recorded as a citizen. To illustrate the significance of this, the Computer... |
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Joe Schmo is your average college graduate who is suddenly transported back to medieval times, without time to prepare. From there the stories, and questions on this site, are all about how he can use his technological knowledge to change mankind. That assumes he survives long enough though...
Would Joe ... |
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I'm writing a novel in which one of the characters has the ability to control, manipulate, and produce electricity. I'm having issues working about scenes which require him to fly around without sounding exactly like the DC superhero Static. (It was used as just a filler until I could think of something ... |
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Supposing you took Earth or a planet like it and doubled its mass, the gravity would obviously increase in whatever proportion to that.
As a result, humans, as we know them, would be ... more stocky, (I guess?) to support the additional gravity.
At what order of magnitude of gravity (or its relative size... |
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As you see my other question [What would be the major changes to our body if we were herbivores?](https://worldbuilding.stackexchange.com/questions/4777/what-would-be-the-major-changes-to-our-body-if-we-were-herbivores). Instead of being herbivores, what would happen if we were [obligate carnivores](http... |
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Setting is in an era when glass would be expensive, in a cold, mountainous region with a lot of goats and horned monsters. I know horn was used in lanterns, but I'm not sure if it would allow through the forms of light that plants crave. Cold/heated frames would be fine, too, if that makes a difference. ... |
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One day, the people of a small village, near [----] woke up to a deafening roar, soon followed by bright flashes of light, coming from the nearby forest. As the roars and thuds didn't let up, they eventually approached the forest.
There, in a clearing, they saw two dragons, a larger red one and a smaller... |
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Could a [perfect mirror](http://news.mit.edu/1998/mirror)/s be made to reflect one side of the Earth from the edge of the solar system and viewed with an optical or radio telescope that is in orbit?
The targeting mirrors and telescope are in orbit around Earth are aimed away at reflected Earth through th... |
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First of all I would like to precise what my species of wyverns actually are. I do not plan to make them huge and gigantic like in many fantasy worlds. Instead they are rather small and can be the size of a cat at most. And they do not breathe fire as they are part of a rather realistic futuristic Earth.... |
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I've been designing an an intelligent, bat-inspired avian race, and I've been struck with a question that I need answered.
Now, I want to have these bats to fulfill different types of ecological niches that are occupied by birds. Think akin to eagles, terns, ravens, maybe even flightless cassowary analog... |
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In my world there are bipedal insectoid creatures (think kind of like the grasshoppers from Bug's Life) who are sentient and communicate primarily through pheromone signals, with some body language involved.
Humans have recently discovered this race, however humans are unable to read or emit the pheromon... |
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* The average power utilization per person is 1 Megawatt.
* The average living space is 1000 cubic meters per person.
* The average total mass in use by a person is 1000 tons.
Assumptions
1. Solar power conversion efficiency is 20% ;
2. 3 meters of ice or equivalent shielding required around a habitat fo... |
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This has been bothering me for a while but I was reminded of it when I started playing Skyrim again. In the dungeons there are some mechanic works, examples including:
* Lever controlled heavy doors and bridges
* Pressure plate controlled traps
* Traps disabled by levers
* Puzzles that require a certain ... |
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For the sake of convenience, this happens on Earth. However, in this scenario only the American continent (all of it) is inhabited.
One of the countries is experimenting with extremely advanced and extremely hazardous power generation technology, codename project Nova. The Nova facility is located underg... |
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On an Earth-like planet, there is a massive plateau, standing more than 1km high, and the breadth of a continent in the middle of an otherwise ocean planet.
I know there are climactic issues to this, but instead of hand-waving it, the best answer would explain the processes that created this steep, high ... |
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They say that nature abhors a vacuum, but could life evolve to live in one? Alternately, could life be engineered to exist on a planet with no atmosphere, even if there is no biologically feasible path through which this life form could evolve?
By vacuum, I mean 'no atmosphere', but with ground. Somethin... |
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Dragons are vicious monsters that take pleasure in killing people by burning them with hellfire in their throats that was given to them by the Devil himself so that they can destroy everything in their path. Well, at least that's how the common folk tend to see them, but in reality they're just animals a... |
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Take a planet with an atmosphere similar to Earth's but, say, 9-10x as dense. What is this going to mean for the performance and design of the heat engines that are so familiar to us? Higher oxygen partial pressure... easier to burn? But higher air density means more heat conducted away... easier engine ... |
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I'm trying to create basically realistic mermaids, and working on developing body language and vocalizations. I have most of the vocalizations I can think of (suggestions are still appreciated), but definitely need a lot more body language. Ideas?
Edit: They are a highly social colony species, so it shou... |
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I've searched through a lot of merpeople related questions on this site and didn't see anything that related particularly to me as most questions have to do with underwater combat or dwellings on the ground.
My species is a race of humanoid axolotls (that means legs and feet like people) who are perfectl... |
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My current WIP involves an athletics competition on a non-terraformed moon, namely the Earth's moon. And while it would be a bit difficult to play certain sports without a breathable atmosphere, the javelin throw strikes me as an event that would be better enjoyed in the moon's 'fresh air' – or rather, l... |
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This is a submission for the [Anatomically Correct Series](https://worldbuilding.meta.stackexchange.com/questions/2797/anatomically-correct-series/2798#2798).
[](https://i.stack.imgur.com/jFbfP.png)
Image credit: japhers.tumblr.com
Origi... |
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In the movie [Pacific Rim](https://en.wikipedia.org/wiki/Pacific_Rim_(film)), we see the beginnings of an alien invasion using very large mobile lifeforms.
Given that we want as large a lifeform as possible with the following traits:
1. It must be able to move under its own power at a *minimum* top speed... |
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This story happens in a near future where environmental concern has become a critical issue. Cars are just got banned within the limits of all major cities out of necessity. Rail public transport (above and under ground) has slightly improved (more stops, faster, broader...).
How (and how fast) would the... |
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When doing some research for some of the resent questions proposed, I ran across an article that pointed out a danger of traveling at extreme speeds in normal space as a high percentage of c I was unaware of. (besides just running into a few grains of sand...)
The first problem after creating some shield... |
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bucking the trend of mermaids I've decided to take a different approach with my mermaids. A long time ago a group of Australopithecus diverged from us taking to the sea. some characteristics of these pseudo-mermaids" are:
* are 149.3cm (4.9ft) tall
* are a grayish color
* have a thick layer of blubber
* ... |
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**What is the most powerful magnetic field that could be generated by a planetary object?** The measurement of 'powerful' will be [field strength](https://en.wikipedia.org/wiki/Magnetic_field#The_B-field) ($\mathbf{B}$-field) at the planet's surface, in teslas.
### Restrictions
* The planet may have any ... |
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My world is essentially a Neptune-sized gas planet that got seeded with life and its surface layer filled with oxygen, therefore gaining a sizeable layer with Earthlike conditions.
Within this layer, life is diverse, but the largest lifeforms would be colonies of treelike plants that have connected bran... |
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My habitat ring is constructed in orbit *around a planet* with disconnected sections:
*(not to scale, obviously)*
[](https://i.stack.imgur.com/aPUTl.gif)
The sections are connected by cables and winched together.
As the diameter gets sma... |
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The time: January 27th, 2017, 7:00 AM local. The place: New York City and environs.
[Jormungandr, the Snakebot of Doom](https://worldbuilding.stackexchange.com/q/37248/75), has just finished steamrolling New York City into something more closely resembling a gravel driveway.
Now it has returned to the vi... |
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In the sci-fi/fantasy novel I am working on, my magic system currently works based on of a fictional type of energy that is created by stars and expelled throughout the universe, like UV rays and that sort of thing. This energy is known as psychic energy (dumb name, I know. It's a work in progress), and ... |
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So assuming their existed an Oracle, what effects would it have on society. Assume that everyone has access to it similar to using a library where the books can't leave.
## Properties of the Oracle
* It can only answer axiomatic (self evident, time independent) questions.
* It has no concept of 'current ... |
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Alice and Bob are lost in the wilderness with no supplies!
Luckily, they're trained for this kind of thing; they decide to forage and hunt for food. About how many hours per day will they be spending on simply acquiring calories? (I assume that the type of ecosystem around them is a strong variable in th... |
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Consider a hard-SF (slower than light) starship. Boosting it up to speed takes enormous energy.
There are good reasons to want to not take all the fuel with you, but to collect energy on the run. Current thinking is that the [Bussard ramjet](https://en.wikipedia.org/wiki/Bussard_ramjet), as popularized b... |
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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.
I'm ... |
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I was reading up a little while ago about [Janus](https://en.wikipedia.org/wiki/Janus_(moon)) and [Epimetheus](https://en.wikipedia.org/wiki/Epimetheus_(moon)) and how every few years they trade orbits. The [mechanics is interesting](http://abyss.uoregon.edu/~js/ast121/lectures/epimetheus_and_janus.html)... |
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The present day atmosphere is roughly 21% oxygen. Historically high-levels might have been as much as 35%, over 66% higher. This made the carboniferous a period of giant bugs and constant devastating wild-fires. How would this affect a civilization trying to develop? In particular, how much easier would ... |
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As far as I know stars are going supernova as a natural process. Can aliens trigger it artificially?
If this is possible then:
1. How can I do this (what minimum technology and civilization development is needed; what tools or devices are needed)?
2. How long this process will take (from "pushing button"... |
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Is there a way to design a river system in an O'Neill/McKendree-style cylindrical habitat to passively feed into itself in an endless loop, from one end of the habitat to the other and back again?
Reworded: is the [Coriolis effect](https://en.wikipedia.org/wiki/Coriolis_force) or other innate properties ... |
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In my world, instead of mammals, birds have become the dominant order. Similar to how Quadrabirds replaced the grazing mammals; Aquabirds will take up the niche cetaceans occupy.
My goal is that the Aquabird would be similar to animals like the orca or the narwhal, but I am stuck on the evolutionary proc... |
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Let's use the sea turtle and the terrapin as an example, need I say more? I used terrapin because like the mermaid which is half fish and half girl so a terrapin would serve as an excellent example.
Generally speaking, species usually grow much bigger in seawater conditions. However rules are meant to be... |
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### Definition:
**Interlunar**
*adjective*
Of or traveling between moons.
I'm (as far as I can tell) inventing the term ***interlunar*** to describe travel between moons in a single planetary system.
Travel between
* Stars = Interstellar travel
* Planets = Interplanetary travel
* Moons = Interlunar ... |
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Here is another planet question for you planet enthusiasts. I have this planet...
[](https://i.stack.imgur.com/7ef66.jpg)
It's called Barahecio. The Mars-sized sphere's *average temperatures hover near the freezing point of water*. Of no... |
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I have a race of humanoids (soarfolk) who, as their name suggests, basically went from normal humans to humans with wings, hollow bones and feathers. Normal humans still exist, and interact with soarfolk, and I'm wondering what the humans should be careful about when dealing with their hollow-boned peers... |
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My story involves everyone in the year 2015 suddenly disappearing. What would visitors to Earth find if they arrived in the year 12015, or 10,000 years after we all disappeared? Assume none of our infrastructure has been maintained during that period.
I'm especially interested to know what would remain o... |
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I recently asked [this](https://worldbuilding.stackexchange.com/questions/2965/what-would-be-the-effect-of-a-powerful-explosive-going-off-in-the-core-of-a-plan) question about what would happen if a fusion bomb went off in the core of a planet, and the answer was relatively uninteresting. As was aptly sa... |
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In many Sci Fi and Fantasy worlds, the deserts are filled with giant megafauna that swim through dunes of loose sand. The issue with this depiction of course is not just the size of said sand swimmers, but of where the energy needed for such giants come from.
If we look at the real world, deserts do not ... |
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What follows is the first in what will be a series of questions I'll be asking in the hopes of solving a problem I'm running into with one of the species in my story: the werewolf, and the particular difficulties it has when it comes to keeping itself clothed.
In this story, werewolves, among other immor... |
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I have a location in my story, the design of which needs a reality check.
**City Description:**
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> As my ship cut across the waves a blurred grey smudge appeared in the distance, as the hours passed it became more distinct and it's true scope came into view.
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> As we neared the end of our voyage a... |
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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 7 years ago.
[Improve this questio... |
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*To err is human*.
That's what probably led us to the verge of extinction in the near future unless we can develop an intelligent algorithm that can make the most logically and accurate prediction on almost every event related to human activities. Perhaps this A.I. can even tell when a persons mood swin... |
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I'm a deity. Unfortunately, my powers are sharply limited:
1. I cannot affect physical world (except #3) at all.
2. I "control" whether a person's soul, after the body's death, goes to "heaven" or "hell" according to well-defined rules based on how they lived their life.
3. I can come into the world as a... |
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Suppose that, while the British were busy making their empire, someone in government discovered magic and let his colleagues in on the secret.
However, the magic they have discovered is fairly limited. There is no mind-reading, telekinesis is limited to small objects such as pens, and personal augmentati... |
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After realizing how aliens and irradiation are not really suited for my world, I came up with a different idea for how Belgium could become a global power, one which I like more.
Basically, at birth, each person gets an ancestor to guide them. This manifests differently for everyone: some people get voic... |
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I am a writer. In my fictional world, I have an area that is supposedly covered with fairly thick fog during most of the night and nearly all of the morning, basically every day (it can leave a bit before noon if necessary). My question is this: **What factors would I need to achieve this effect?**
Facto... |
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Is a scifi setting of constant artificial light everywhere plausible? I'm thinking to the point that the average adult person has not gone out of a city and has no experience of general darkness (obviously he has knowledge of what night used to mean and what darkness is, under a cover for example, but no... |
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I'm trying to create some more original monsters for a fantasy story and I was wondering...
Assuming you couldn't die, what would happen to your body and how would you appear if you were exposed to radiation (equivalent to refined Uranium) for 12 hours a day?
I understand this probably isn't exact enough... |
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**Edit:** Okay, truth be known that this question was part of a set of 5 related questions that I was recommended to break up into individual posts (in their original form, the comments had no trouble seeing where the whole thing was going). I think that's where the confusion here is coming from and why ... |
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There are a number of places in which cumulonimbus clouds - and therefore, thunderstorms - are likely to form, such as:
* Cold fronts, where masses of cold air move into hot, moist air masses
* Around the equator, where the trade winds of both hemispheres come together
* Mountainous areas, which increase... |
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I am plotting out a sci-fi setting, and trying to figure out the consequences of a non-conventional form of time travel.
In the story, time travel has been achieved by means of temporal displacement. The principle is simple; the traveller enters a capsule, and everything inside of that capsule gets telep... |
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The world I'm thinking of is a large moon of a gas giant. It's fairly Earth-like, perhaps a bit smaller, might be a bit magical, but sits about where we sit around a star very similar to ours, except that this star absolutely loves throwing its corona around.
Suppose this world was struck by an extreme c... |
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Scansoriopterygidae was a family of theropod dinosaurs that lived during the Jurassic, the most well-known member of which was *Yi Qi*. They are thought to have been arboreal insectivores, and convergently evolved bat-like wings.
[](http... |
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In a certain world there is a ruler who runs a very powerful country with an iron fist. A faction of oppositionists has been giving her lip and has made some mean comments implying she brings the country dishonor due to not being chaste.
She wishes to punish those remarks by enacting a certain song in a ... |
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**What I want:**
My world has a large mountain valley region that is about 70 miles in diameter. I would like for there to be a historical event in which a portal to the moon was created in the valley and everyone living in the valley (and maybe some people outside too, doesn't matter) ended up dying of ... |
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Say they had pale skin, what would they look like? Would the lips be black? Would the vascular system show through the skin more? I'm not very interested in how or why their blood is black, just how it would effect their appearance overall.
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In cold conditions and when sedentary these people w... |
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In [How would sentient intelligent, normal-sized mice fight against humans?](https://worldbuilding.stackexchange.com/questions/46632/how-would-sentient-intelligent-normal-sized-mice-fight-against-humans#)
Humans are not doing well at fighting against the mice. They are small, smart and deadly. Humans wi... |
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So, according to [Other blood colors](https://worldbuilding.stackexchange.com/questions/28276/other-blood-colors) it is entirely possible for other blood colours to evolve based on what base they use, but why? What would be the benefits of these different bases? What purpose would they serve? What condit... |
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Let me outline the current world at the moment:
Its a modern society, with smart phones and jet planes, much past the medieval ages where humans warred with dragons. The fact that dragons were so powerful and deadly pushed the humans to all band together under one government, so its truly humans against ... |
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I'm running a tabletop RPG and out of rules convenience I just made it so any injury that isn't fatal or very serious, such as losing a limb, will naturally heal within a day or so. Now this hasn't really come up so far but I feel like this *should* come up and I have a feeling that this would have some,... |
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# Background
I'm creating an island on a medieval world with one large port city/town and roughly half a dozen smaller settlements on it. It's not too far from the mainland—several hours at most—but big enough to have a mostly self-sustaining population of its own.
## Conceits of the Setting
* The island... |
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If a centaur were to have one set of organs, how would they be placed and what sizes would they be?
What limits would there be on the centaur's body?
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## Digestion
A horse's digestive tract is 3-4 times the length of a human digestive tract because horses are able to survive by eating grass, ... |
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Imagine the Earth is struck by a laser/magic beam capable of piercing it and leaving a lasting hole. What effects would observed? Would there be a difference between the hole(s) being made in the ocean (one end in the ocean one end not, both on land, both in the ocean)? Would the effects be different if ... |
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I'm currently designing a large scale D&D based campaign, magic is based on winds and weather coming from two points, the 'northern pole' and the 'southern pole'.
Currently the "world" is a centralised giant continent (hypothetically oval) with a spread of mount ranges through the middle, splitting it. ... |
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I'm trying to work through the mechanics of hard sci-fi space combat, and I came across the [Casaba Howitzer](http://toughsf.blogspot.com/2016/06/the-nuclear-spear-casaba-howitzer.html).
The basic idea is a nuclear shaped charge. The blast from a nuclear bomb is partially contained into a cone / beam of ... |
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Our knowledge of exoplanets is changing all the time, but based on observations so far, is it possible to estimate the number of planets in a galaxy the size of our own that would have an Earth-Like gravity? Assume "Earth-Like" to be no more than say 25% higher or lower.
It seems to me the limiting facto... |
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In [this Answer](https://worldbuilding.stackexchange.com/questions/77954/vocal-hardware-required-for-a-single-creature-to-communicate-with-any-land-anima/77961#77961) I suggested that an animal could have a *tampani* acting as a loudspeaker, as in Vernor Vinge’s *The Blabber*, later featured as the race ... |
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What characteristics might define a group of multicellular chemosynthetic organisms (similar to that of bacteria living in earth's hot springs and deep sea vents, but relatively more complex, as mushrooms (a fungus with multiple cell fates) and lichens (a symbiosis between a fungus and an alga) are more ... |
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Suppose that I have a planet very similar to Earth. It has the same level of gravity, water-land ratio, temperature, air composition, rotation and revolution speed, tectonic activities, temperature. It has ice caps on the poles just like Earth. It also have life on it with plants, animals and humans, alt... |
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