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Questions tagged [alternate-earth]

For questions relating to radically changed Earth. This alternate Earth could be a post-apocalyptic Earth, or Earth with major changes in the current social/political/economical schemes.

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7 votes
1 answer
153 views

Would it be possible to have "Atlantis" right westward from the Strait of Gibraltar, and have the Mediterrean remain the same?

Im imagining an Alternate History with a realistic Atlantis. In my setting, the world is largely identical to our own, physically, if not historically, but with one major exception: The Azores, Canary ...
2 votes
1 answer
71 views

Are my ocean currents acceptable?

I really don't know if this is the right place to post this. After about 6+ or so months of trial and error (and like, hours re-watching the videos Artifexian made on them), I've managed to come to ...
-2 votes
2 answers
192 views

What would remain of human constructs after ~3000 years? [duplicate]

In my setting, humanity has largely—if not entirely—gone extinct on Earth. I was curious about what would remain of modern human architecture after around 3 millennia of no upkeep. Primarily urban ...
6 votes
1 answer
97 views

How could a large continent in the North Atlantic Ocean affect ocean currents? [closed]

This is my first time really using stack exchange so yeah. forgive me if i messed something up or if im not using it right. Ive been making an alternate earth and i have repeatedly stumbled upon an ...
9 votes
1 answer
351 views

How large can differences in gravity be without being overly dangerous to humans?

Let's imagine a planet that is 5000 km in diameter but has the mass of the Earth. I'd imagine standing on that planet might feel similar to standing on the Earth, because the gravity would be ...
2 votes
1 answer
47 views

How differently would ocean currents be affected by smaller, shallower abyssal plains?

On Earth, the abyssal plain is the planet's largest habitat, comprising of 70% of the oceans. Another important point is that plain can be found between 10,000 and 20,000 feet deep. In this alternate ...
5 votes
2 answers
279 views

Superhabitable Earth Analog

Consider an earth analog but with different land mass distribution and shallow seas. If the seas are at just epipelagic depth, what would change energy-transport-wise? If the land mass can have ...
0 votes
2 answers
213 views

How to keep the imprisonment of mythical creatures a secret from the public, but not from their human family members?

For longer than has been recorded, "monster hunters" of various denominations have hunted humanoid magical creatures which have lived in hiding for even longer. Most of these creatures can ...
4 votes
2 answers
238 views

Landscape of Indefinitely Old Earth

If we somehow fix the Sun's luminosity indefinitely at current levels, stabilize the Moon's orbit so that it no longer drifts away, and match the solar tides precisely with lunar tides so Earth's ...
-2 votes
2 answers
249 views

Medieval Europe without animals [closed]

I'm working on a setting that in some ways looks like medieval Europe without domestic, or in general agriculturally significant, animals, and I'm trying to figure out what the implications would be. ...
5 votes
7 answers
847 views

Gravity in a Flat Earth

So I have seen the never ending clash between those who believe in a Spherical Earth and those who believe in a Flat Earth. It thus made me wonder what a Flat Earth would even be like. One of the ...
28 votes
9 answers
4k views

Biplanes landing on top of skyscrapers by means of a wind tunnel in retro-future Earth

In a retro-future version of Earth, one of the main modes of air travel is by gasoline-powered biplane (design circa 1914). I want these to land in places where in real-life Earth only helicopters ...
4 votes
2 answers
121 views

What would my Sun look like to fit the properties of my Earth? - Part 2

Continuing on a previous post of mine (link: What would my Sun look like to fit the properties of my Earth?) where I wanted my planet to orbit around its Sun in 365 (Earth-)years. However this did not ...
2 votes
1 answer
123 views

Social implication of lion-people living with normal humans and how to make them into free folk and not slaves while maintaing their role as defenders [closed]

Lion-people are kidnapped at birth from humans. Why? Because Lion-folk prey on humans as a form of sport and entertainment Kidnapped cubs of lion-folk are groomed in ''loving'' families in order to ...
1 vote
1 answer
126 views

Would the sort of tectonic activity described below shorten Earth's lifespan?

The unfortunate truth is that hundreds of millions of years in the future, Earth will have used up all of its radioactive materials. And when that happens, tectonic activity will stop and magma will ...
8 votes
5 answers
321 views

A Pangaean civilization has its land split apart by something

I want to write a story that has a Pangaean like world, but human civilization already existed during that era. Basically, the earth just has one giant piece of land while the rest is the sea. People ...
11 votes
8 answers
3k views

What key invention allows the exploration of my hot humid world?

I want to know what key invention would allow my civilization to travel down to and explore its world at sea level. This is similar to my previous question* but this time does not assume metals are in ...
1 vote
0 answers
108 views

Flora and fauna from a darker, foggy planet [closed]

In a previous post, I consulted about the characteristics that a earth-like planet could have, if it's covered by a permanent mega-fog, with a chemical composition similar to water vapor, which ...
7 votes
5 answers
1k views

How can my fictional race of humans extend the area of their world they can explore?

This world is an alternate Earth similar size, mass and distance from its star to our Earth. The atmosphere is similar in composition to Earth except at 5000m altitude the pressure is two bar and the ...
4 votes
1 answer
188 views

How to calculate temperatures on my world given different pressures and altitudes

The fictional world is Earth-like with 1g gravity and similar solar radiation to Earth but the inhabitants only live on very high plateaus at around 5000m where the pressure is already 3bar. How do I ...
4 votes
1 answer
393 views

Super hot tropical forest

Consider an Earth like world except much hotter with extremely hot and wet tropical rain forests. Assuming 100% humidity, how hot might the alternate Earth tropics get and still support tree like ...
10 votes
11 answers
5k views

Are airships practical in a world without much metal?

Following on from my previous question about airship engines, I was planning to limit the development of the internal combustion engine and much modern technology in my world by greatly restricting ...
1 vote
1 answer
123 views

Effects on World Climate without (Most of) northwest and central Europe

So I'm considering creating a fantasy setting heavily modelled on Earth with the exception that most of what we consider Northwest and Central Europe is replaced by sea. I decided to as a reference ...
2 votes
1 answer
175 views

Would a longer PETM make Earth hotter than it was?

Sometime between the Paleocene and Eocene epochs, there was a mysterious, sudden, dramatic rise in global temperature. This moment in time was known as the "Paleocene-Eocene Thermal Maximum",...
10 votes
9 answers
2k views

How to slow and limit the scope of the internal combustion engine in powering an airship

I need to limit the development of the internal combustion engine so that it is only available in small numbers to few individuals and does not progress technically, or at least only progresses slowly....
3 votes
3 answers
1k views

Maximum size of an Earth-like planet that's as close to reality as possible

EDIT: by 'larger' I meant a larger radius EDIT 2: Relaxed the elemental similarity criteria, as that is incompatible with the 1G criteria I wanted to have my story take place on a huge, alternate ...
3 votes
2 answers
84 views

Is predictable time, type and amount of precipitation on a global scale a risk for ecological damage?

On Earth, we have problems with rain and other forms of precipitation: either it's absent for too long and it causes droughts and ecological disasters, or it's way too plentiful and it causes massive ...
3 votes
1 answer
412 views

How to Turn Protoceratops Into a Real-Live Griffin

It was believed that the discovery of a small, herbivorous dinosaur named Protoceratops was the inspiration for the creation of the iconic griffin, a belief challenged in 2016 by paleontologist Mark ...
12 votes
4 answers
2k views

Would it be possible to turn off a small country's internet from the outside? [closed]

Let's say a country is going through political turmoil because a big enough part of the population wants to split off from it and form their own national identity, and they succeed. Let's call the ...
3 votes
2 answers
180 views

What would the rest of the oceans look like in this scenario?

The scenario being this: The red band extending 15 degrees from the equator is a dead zone, too hot for complex, multicellular life to thrive. How hot are we talking? The equator in this scenario ...
9 votes
8 answers
2k views

Is it plausible for a tribe to have a standing army?

I'm creating a parallel world inspired by migration period in the dark ages. I have a tribe that has a something akin to standing army consisting of infantry cavalry rangers Wealthier clan leaders ...
0 votes
1 answer
82 views

Ideal conditions for Star Trek cultists with nuclear weapons to force the rest of the world to roleplay with them [closed]

A handful of extremely intelligent and resourceful Star Trek fanatics have, over the course of 2-3 generations assembled an arsenal of nuclear weapons in secret. Upon completion, they plan to ...
3 votes
2 answers
176 views

How would a planet having a high concentration of metals like an asteroid affect it's ecosystems?

I am working on a Sci-Fi/ Fantasy world called Atterra which is an very alternate version of earth that has been artificially injected with metals and materials from the asteroid belt. Long story ...
3 votes
1 answer
76 views

Would these changes alter the effects of Tornado Alley?

Here is how the meteorological danger zone called "Tornado Alley" is made: Warm, moist air from the Gulf of Mexico mixes with cold, dry air from the mountains and warm, dry air from the ...
2 votes
4 answers
251 views

How might a lower gravity planet sustain a warm, earth-like atmosphere?

I've already posted something similar recently, but I don't think I was really asking the right question. I'm designing a hypothetical lower-gravity planet with 0.47M, 0.79r and 0.76g, with a similar ...
2 votes
2 answers
351 views

If Earth was less massive, with 25% less gravity and an atmosphere scaled down proportionately, how would that affect climate?

Everything else being equal, how would reduced planetary mass and gravity affect the behavior of the atmosphere and the climate?
5 votes
4 answers
1k views

Could a hypothetical planet composed of a neon-oxygen or argon-oxygen atmosphere with Earth-like pressure levels sustain life?

I'm trying to create a hypothetical planet scenario, where there is a planet that has a similar atmospheric pressure to that of Earth, but in this case, it has a gas different than that of nitrogen. ...
4 votes
4 answers
381 views

What Would the Climate Be Like on this Extreme Alternate Earth?

In an alternate universe, Earth orbits not one sun, but two. As you can see, both stars are orange dwarves, each one only 40% as bright as our sun. All the same, this alternate Earth orbits from ...
1 vote
3 answers
310 views

What's the impact of an Australia-sized continent near South America?

I have an idea for a story set in an alternate world where an Australia-sized continent exists near South America, near Chile. Question: what would the climate of this world would be, if this ...
6 votes
3 answers
181 views

Which marine organisms would survive this longer Paleocene-Eocene Thermal Maximum?

56 million years ago, Earth underwent the greatest rise in temperature in the last 100 million years. In just 20 to 50 millennia, the global temperature had risen by five to eight degrees Celsius (...
8 votes
2 answers
170 views

How far across the sea can mosquitoes disperse?

One of the more interesting facts about the biogeography of Hawaii is that mosquitoes were not always present; they only arrived in the early nineteenth century, as stowaways aboard oceangoing ships. ...
2 votes
4 answers
400 views

Most hospitable biomes for living off the land

I'm trying to figure out which are the most hospitable biomes for living off the land. Say we have a small spacecraft fallen through a time warp that takes it sideways in time, where it finds itself ...
5 votes
1 answer
81 views

What changes to a humans physical form would occur if society lived inside the Earth?

(Mandatory I am new here, hello, nice to meet some fellow world builders, sorry for any mistakes, yikkity yak and all that) In my "world", it has been 500 years since the majority of human ...
1 vote
1 answer
188 views

What Would Be The Technological Limitations of a Civilization That Never Developed the Concept of Zero? [duplicate]

I have been brainstorming a short-story idea about an advanced civilization that develops on earth 60 million years after humans go extinct. Said civilization discovers time travel and decides to meet ...
5 votes
2 answers
151 views

Is this sort of life cycle on a megamangrove feasible?

Point of departure--56 million years ago, in which the Paleocene-Eocene Thermal Maximum lasted three to four times longer than it did in our timeline. Today, on this alternate Earth, the twilight ...
7 votes
3 answers
878 views

These Primates Don't Look Like Primates. How to Fix Them

For years, I've been building and rebuilding an alternate Earth. The point of departure is 56 million years ago, when the hottest episode in the last 100 million years, the Paleocene-Eocene Thermal ...
9 votes
3 answers
2k views

Could a river civilization develop in a cold desert climate?

There seems to be a trend with the oldest civilizations (Civilizations being urbanized societies with a government and social heirarchy) starting around river valleys surrounded by desert; the ...
1 vote
1 answer
207 views

What would the equator be like if Modern-Day Earth were as hot as the Cambrian?

This is a map of Earth's climate today: This is how the Koppen classification colors the particular climates, so I don't know why the lower latitudes were dominated by several shades of the color ...
13 votes
23 answers
6k views

Reasons why a high tech species does not have space travel

I am writing a story where humanity has advanced technology, but I want to give a justification for why they are still on their planet. Here humanity has advanced ai, superconductors, laser weapons ...
3 votes
3 answers
184 views

Can a new geological material (specifically, a metal) be formed no older than 56 million years ago?

There is an alternate Earth that I've been building and rebuilding for years. The canonized point of departure is 56 million years ago, specifically a Paleocene-Eocene Thermal Maximum that is four to ...

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