Questions tagged [alternate-worlds]

For questions about worlds other than Earth that are significantly different. This could be a water, ice, barren or other planet. For questions about planets similar to Earth with specific differences use the *earth-like* tag.

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2
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7answers
510 views

How to make a supermassive creature survive in space? [duplicate]

I want to implement a massive organic being into a comic im making. The story goes like this, there is a dying "birthing mother", a being that can edit DNA and births the common soldier within this ...
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2answers
211 views

Why would someone want to teleport the Moon away from our Solar system? [closed]

Why would someone want to teleport the Moon away from our solar system? A glimpse of the future seen in a dream, reveals an ET race with a ship as big as the Moon, if not twice as big, that manages ...
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4answers
156 views

Feasible reason for a world to move all of its sick, orphaned, incarcerated and elderly population to an isolated continent [closed]

Is there any plausible reason (abstract or otherwise) why a world and its population would decide to permanently move/exile all orphans, sick population,incarcerated and elderly population to an ...
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4answers
424 views

Can early civilization utilize gold and silver when they are abundant, and copper and iron are rare?

This question is a thought expansion on this What early tools might be devised on a planet where diamonds were abundant? According to this article, prehistoric men already utilized gold and silver ...
2
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3answers
292 views

Evolution of vipers (merfolk)

Appearance The ''vipers'' are semi aquatic humanoids species with webbed fingers on both hands and feet, they also have 2 fins on each leg and their legs are covered in scales from the feet up to ...
2
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3answers
277 views

If a major disaster wiped out most of humanity, how many survivors would there need to be in order for them to rebuild? [duplicate]

I have a story set about five thousand years after a major disaster reduced the world population from billions down to... well, that's the question. How low could it have gone, and still provide the ...
17
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9answers
6k views

How large can a world be in fantasy? [closed]

As far as I read books, I met various worlds. Each of them has own size. Middle-earth is very large and partially not limited (some parts are only mentioned). Discworld is very large, but quite ...
4
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9answers
897 views

What could be a reason why a more developed civilization isn't helping a less developed one to advance? [closed]

The idea is that there are multiple really small, undeveloped villages and then there is a separate, to villagers non accessible place (a city), where a higher society has developed. This city has it'...
3
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1answer
338 views

Is this fictional planet possible?

I was trying to make an interesting moon of a gas giant similar to Jupiter with a liquid ocean of water. The moon orbits in the equivalent orbital space of Io and is about twice the size of Mars. This ...
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2answers
140 views

Does this summary make sense? [closed]

So I'm writing a story where two parallel earths end up fusing together and are becoming one and through some sort of "magic" they don't end up destroyed. So let's say that on the one earth its ...
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7answers
5k views

A World with Freshwater Oceans?

Is it possible to have a Terran-like world where the seas and oceans do not have high levels of salt? Could, in fact, oceans and seas exist that were fresh-water? Excuse my ignorance. Assumptions: ...
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3answers
507 views

Is there a difference between an infinitely large spherical world and an infinite flat world? [closed]

Obviously, one is a sphere and one isn't, but would the inhabitants of either world be able to rule out the possibility that their world might actually be the other? We humans knew that our world was ...
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4answers
271 views

How would a neutron star affect the habitability of planets orbiting a companion star?

A star system consisting of two stars forms, with one being more massive. As such, the larger star soon exhausts its fuel and ends up as a neutron star. The secondary star has a semi-major axis of 700 ...
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4answers
415 views

Are these conditions for a planet realistic?

Since I'm creating a "new world" for my story, I wanted to know if the following conditions would work for an Earth-like planet: Its moon (more or less same size as our moon) being much closer (but ...
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2answers
212 views

Calculating the solar spectrum received by a planet

How do I calculate the spectrum of light experienced on the surface of an alien planet? I need it to decide what color the local photosynthetic life will predominantly be.
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6answers
359 views

What would be the conditions and causes that would make a planet not spherical?

Introduction I have been looking for information on the Internet. I have discovered that the shape of the planets is due to the gravity to which they are subjected, so they are spheres (,but they are ...
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9answers
1k views

Rivers flowing uphill

In this article, scientists are investigating river channels on Earth, Mars, and Titan to see how rivers modify their landscapes. The following quote caught my eye: Rivers are, in a way, topography ...
0
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1answer
152 views

What would public opinion be on nukes if there were less than 100 in the world? [closed]

Right now I am writing a story within its own realm, sort of like Strangereal from Ace Combat, but with a total of 9 continents and 136 nations with technology and societal trends comparable to what ...
6
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4answers
580 views

How can I explain rainforests in a world with little, localized rain?

On the world I am building (Let's call it Bob for simplicity's sake), the days last 9 years. As a result of this, the living beings on Bob must migrate across the planet to avoid the encroaching night....
4
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2answers
295 views

What would make an earth-like planet have a solar eclipse everyday?

What would make an earth-like planet have an eclipse every day? does it need additional moons and what would happen if it had those? A Total Solar eclipse across most of the planet's surface
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3answers
355 views

How would someone from ancient times kill themselves without any weapons? [closed]

It's a question that most people have not thought about: How would they kill themselves without using any weapon (or anything that could be classified as a weapon)? It would be almost impossible, ...
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2answers
452 views

What kind of culture and society could humanity develop with one sapient gender? [closed]

Let's say we launch the first colony ship to a far system. The colony ship engines fail halfway and the ship drifts for a year across the space. The ship was recovered by drones of an automated ...
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2answers
80 views

Without regular interaction, what time of year would diseases spread? [closed]

Before all the kiddies swapped germs habitually every fall/winter and in turn spread it to their families who carried it to work, what season or time of year was the most common for the spread of ...
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6answers
486 views

Imagine a world where a drug that can greatly enchance IQ exist. Would it be legal? [closed]

I had a talk with my friend about limitless. Imagine if we had a drug that ...
7
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2answers
398 views

Could a plant-like forest or jungle form in an underground lava dependent ecosystem?

Could an alien underground macroscopic ecosystem including human sized plant-like organisms evolve around lava as an energy source? These organisms could use heat and/or light from the lava to ...
8
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1answer
313 views

What's the longest plausible orbital period for a habitable planet with a 3:2 spin-orbit resonance?

What's the longest plausible orbital period for a habitable planet with a 3:2 spin-orbit resonance? I want a planet with a 3:2 spin orbit resonance (which would experience 1/3 of a year of nighttime ...
2
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1answer
520 views

How many giant ants would it take to carry an adult/ how big does a single ant have to be to lift an adult? [closed]

Im writing a story about a less evolved world where a giant ant colony takes in a stranded stranger. In a world where ants are the size of a small tarantula, how many ants would it take to lift/...
8
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3answers
319 views

Plausibility/mechanisms for biogenic silica on a terrestrial planet with a reducing atmosphere

Situation: a large terrestrial planet (a 'super earth', around 9 earth masses with a surface gravity roughly double earth's) with a mostly hydrogen atmosphere and ammonia oceans (pressure is high ...
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5answers
755 views

How would a lunar cycle of 18-19 days affect women's menstrual cycle?

Imagine an Earth-like planet with a moon that is closer to the planet than ours with a lunar cycle of 18-19 days. I am trying to imagine how this different cycle would affect human beings and animals. ...
7
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3answers
215 views

Can long-term exposure to high-energy radiation without corresponding visible radiation induce melanism in a species?

In some environments (think of the Faerunian Underdark for a fantasy example, or a planet orbiting a pulsar for sci-fi folks), high-energy (UV and up, but I'm mostly concerned about UV and very soft X-...
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3answers
340 views

Can a world go through multiple apocalypses without the dominant species going extinct or finding a solution?

My story idea is that on an Earth-like planet, with a human-like, intelligent dominant species (basically human), there are multiple apocalypses. Each gap between the apocalypses is called a cycle and ...
4
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3answers
236 views

Would a massive ocean yield larger storms?

Not sure if my intuition here is right. All else being equal, would a massive ocean yield larger and more severe storms? If, say, we removed the Americas, would the new Atlantic-Pacific Ocean be much ...
5
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6answers
251 views

How to catch giant sea creatures?

One hundred years into the future, humanity colonizes the first planet in another solar system. A big ocean world! Yay! But there is a problem: Most of the flora is toxic for consumption, so the ...
10
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8answers
735 views

Resolving anachronism: Have a modern society with outdated warfare

I am currently trying to resolve a problem of heavy anachronism in the story/world I am "building". I will start of by giving a small summary of the story/world, and why there is an anachronism. (...
3
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4answers
216 views

How exactly would trading information take place if there were two virtually identical worlds that could message each other?

A virtually identical Earth has been discovered. Its history is almost exactly the same, with only incredible differences before about forty years ago. As a result, many books and movies are the same ...
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2answers
172 views

Observing the universe from a proton [closed]

I am trying to build an ultra-lilliput world. Let's assume that sentient beings can exist on objects of the size of a proton. Would they be able to observe the atom where the proton belongs, its ...
5
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3answers
296 views

Could a branch of canine creatures (instead of apes) evolve into humanoid animals?

What I mean is: instead of a "rat" evolving into primates and those tree hugging primate becoming bipedal great apes, imagine a "rat" evolving into a dog-like or cat-like animal, then that animal ...
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3answers
1k views

Planet with poles warmer than equator

I am trying to build an "exotic" planet under currently known physics and chemistry laws. Besides having an highly tilted revolution axis (which results in 1 day lasting 1 year), which other ...
0
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2answers
195 views

Room-Temperature (or near enough) Superfluids

Are there (or can there exist) a room-temperature superfluid that is not toxic or in other ways dangerous to humans? (A superfluid being a liquid that can crawl up the sides of objects and completely ...
29
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16answers
4k views

Can the existence of an orthogonal reality be proven to those who cannot experience it?

In the following I consider "reality" to be "all the sensorial evidence a living being can obtain by interacting with its surrounding world". I am setting up a world where two realities exist, but ...
0
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2answers
182 views

A planet inside out [duplicate]

I've had this dream tonight about a planet that is Earth but inside out. The outside of the planet are rocks, stone, a surface like that of the moon. There a few holes that tunnel through the surface ...
44
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20answers
9k views

How can I explain English existing in a fantasy world?

My hero travels from our world to a fantasy world where people speak English. While there are other nations that speak non-English languages, the particular land she arrives in does. How can I explain ...
3
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2answers
296 views

How to make a planet with differential gravity and constant daylight

I am hoping to create a planet with a greater rotational speed, making it oblong, thus causing differential gravitaion from the equator to the poles. I am hoping for the gravitarion to be lighter than ...
31
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4answers
7k views

A planet rotating twice per second; what mass is needed to hold it together, and how oblate would it be?

I want to create a planet that has a frequency of two rotations per second, thus making a "Planet without Night". The planet will be like a flattened disc, due to inertia causing the planet to be an ...
26
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10answers
2k views

Is there a reason why similar or the same musical instruments would develop?

In a lot of fantasy world's the instruments used are the same or very similar to our own, the real reason why is obvious: the creators would have to create a music system from the down up which is ...
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1answer
178 views

Infinite office building with main character trying to understand it [closed]

I was thinking about a story featuring a main character waking up in some kind of infinite alien "office" building. Infinite by means of number of rooms and all three directions, maybe with gangways ...
0
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2answers
148 views

What are the consequences of a looping 3-dimensional space? [closed]

I was thinking of a world with a closed 3-dimensional space that would loop on itself. To describe it in another way: Forever traveling west, you came back to your starting point from east, same thing ...
1
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2answers
254 views

How would Water and wind current work on a fantasy earth?

My world is flat. Water constantly pours over the edge, where it becomes vapor and forms clouds. Assuming that magic is involved to create Earth-like gravity, what effects would this setup have on ...
17
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4answers
2k views

What would it be like to live on a rapidly rotating planet?

On Earth we don't really notice many effects of the Earth spinning, apart from the day-night cycle. It took a long time for people of Earth to realise that it even was spinning, but there are ...
2
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2answers
371 views

Consequences of a completely friction less surface with gravity like moon

In the year 2588, ISRO (Indian Space Research Organization) along with collaboration of NASA had discovered a new planet named Accio several light years farther than Pluto. Scientists have computed ...

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