Questions tagged [alternate-earth]

This tag is 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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6answers
170 views

Preserving information for future humans

I'm conceptualizing a sci-fi short story. In it, the main character will find an obelisk type object which has been half-buried for who knows how long. Well, the answer is about 20,000 years. The ...
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2answers
110 views

Could a second Trojan moon orbit Earth, as in, a second moon orbiting Earth from the same distance as our moon?

Here's the basic gist about our moon--it's one-quarter the width and one-eighth the gravity of Earth, it's rocky, it has no atmosphere and it orbits Earth from a distance of approximately 240,000 ...
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1answer
94 views

Effects of a sudden change in magnetic poles

In my verse the Magnetic Poles of the planet underwent a sudden shift due to the construction of a great tower imbued with great amounts of Magic. This shift made it so that the poles shifted to the ...
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2answers
109 views

What POD Would I Need For Earth's Lost Worlds to Exist Today?

This is a map of Earth as depicted by the DeviantArtist ToonHolt: As you can see, many new landmasses have been added, from lost worlds like Sundaland, Zealandia and Kerguelen, to fictional worlds ...
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2answers
94 views

Naturally occurring temperate meadows

On a largely uninhabited world with geology, climate, biome etc very similar to prehistoric Earth, I have some scenes taking place in a temperate grassland. It's at moderately high altitude, and I ...
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3answers
155 views

Without tides, would we have beaches?

Consider a world similar in most ways to Earth, except with no tides. (No moon, and for some reason outside the scope of this question, solar tides are negligible.) Would it have beaches as we know ...
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1answer
72 views

What will Earth's orbit around the sun look like if it were standing at an axial tilt of 66.5 degrees? [closed]

Earth currently stands at an axial tilt of 23.5 degrees, low enough for seasons to form. Here is the diagram below: In the spring and autumn months, Earth parallel to the sun. In the summer, it ...
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3answers
84 views

How species-specific are tropical diseases and parasites?

Following on from a recent question about animals, concerning a group of people traveling sideways in time, to a world that resembles Earth as it would have been had humans never evolved, it occurs to ...
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2answers
219 views

How feasible would a Gaza - Gulf of Akaba canal be, purely technically speaking?

Note: partially inspired by the recent ship that ran aground in the Suez canal. In my alternate history novel, I'd like there to be a second Red Sea-Mediterranean Sea canal roughly along what's in our ...
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10answers
5k views

How dangerous are animals with no history of human contact?

Wild animals like wolves, lions and bears rarely attack people. They behave as though they know humans are dangerous and generally best avoided. Imagine a group of people traveling sideways in time, ...
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2answers
188 views

How much pressure would sea level be if the atmosphere were as thick as mentioned below?

Here is how thick our atmosphere is: Troposphere: 7-20 kilometers Stratosphere: 20-50 kilometers Mesosphere: 50-85 kilometers Thermosphere: 90-1,000 kilometers Here is the thickness of the ...
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3answers
219 views

Roughly how many levels of command were there in a large WW2 army?

I want to build the command structure for a WW2 technology level fictional army. I’m struggling with all of the different units and especially the HQ’s. I need to understand how a real army of this ...
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5answers
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How many species does a virus need to infect to destroy life on Earth? [closed]

Okay, let's say that there's a virus that can infect multiple species, is very hard to cure, extremely contagious, can linger asymptomatically for long periods of time, and likely to be deadly. It ...
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2answers
229 views

How Bright Would a “Summer” Night Be on This Extreme Alternate Earth?

Here is the oversimplified map of the solar system of an alternate Earth: It is actually two separate binaries--one consisting of a red giant 100 times as wide, one-third as massive and 1,000 times ...
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2answers
271 views

Is The Climate Map for My Alternate Earth Accurate?

Here is a map of an alternate Earth that I've been building and rebuilding for years: To make things easier on all of us, myself included especially, at the bottom left is a legend on this world's ...
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2answers
143 views

Dodgy Radio Communications

This question relates the same world discussed in this post: Horseback Travel in an Unpopulated Pacific Northwest Two mounted patrolmen are tasked with navigating and policing a reimagined Coastal PNW,...
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0answers
60 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 ...
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3answers
209 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 ...
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2answers
121 views

In This Picture, How Far Can One Binary Orbit the Other?

In an alternate Milky Way in an alternate universe, there is a cluster of stars so dense that nights are over 60 times brighter than our full moon. In that cluster is a solar system presented (albeit ...
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3answers
165 views

How would medieval Europeans react to discovery of fantasy races? [closed]

My question is inspired by this question Infinite flat world Basically instead of the Earth being a planet it is instead a small portion of an Alderson Disk. According to the writer Larry Niven "...
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8answers
1k views

Navigating under a starless sky: how to determine the position?

My alternate Earth is placed, together with the whole solar system and nothing else, in the center of the Boötes void. At nearly 330 million light-years in diameter (approximately 0.27% of the ...
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2answers
86 views

Is my alternate earth possible? [closed]

You see, my alternate earth has lots of monstrous, uncivilized beasts like the Cipactlis and Timberwolves. My planet was formed long ago duel to molecules becoming these beasts like normal Earth. This ...
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7answers
300 views

How Can a Mammal Be Green and Blue? (No Camo, Please!)

This picture is of a horselike mammal drawn for an alternate Earth project that I've been working and reworking on for years. The drawing itself--and the coloring--was done by the DeviantArtist "...
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4answers
209 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 ...
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1answer
57 views

How Would the Moon Differ From Our Own for an Alternate Earth With No Seasons?

Four-and-a-half billion years ago, our planet suffered the nearest miss imaginable. Theia, a rogue planet the size of Mars, crashed into an infant Earth. Earth itself survived, but nothing was the ...
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1answer
184 views

What if Theia Never Hit the Earth? [closed]

Let's say that for some reason, Theia never hit Earth during the formation of the solar system. However, the two heavenly bodies ended up in a stable orbit around each other. Due to this, the Earth's ...
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2answers
182 views

What is the best place to rebuild humanity [closed]

Imagine that time goes back, no apes smarter than chimpanzees appear, and then in year 2020, 100000 random humans with all the knowledge we have now spawn naked in one area. In what region of the ...
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6answers
765 views

How can I have gadget-using superheroes?

A reason why I dislike comic books: Superheroes/meta-humans/etc.. You see, superhero and supervillain powers need to be impossible (or extremely hard) to reproduce, in order for them to work as ...
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10answers
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What factors would limit the size of an ancient wagon and how big could they get?

I would like to create a setting where it would have been beneficial to use very large wagons. You are free to choose the setting, cargo and route, within the limitations below. The wagons don’t have ...
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1answer
119 views

In This Comparison, Are the Continents Moving Too Quickly?

This is a map of one of my alternate Earths from 233 million years ago in comparison to a map of our Earth today: And this is a map of the same alternate Earth, this time from 100 million years ago, ...
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2answers
206 views

What Will My Alternate Earth's Climate Be Like? (Basically Speaking, Not Asking Much)

Ultimately, this scenario will depend on whether or not this alternate Earth would orbit one G-type star or two, and whether dawn would still be in the east, like back home, or in the west, like in ...
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2answers
163 views

Could Prehistoric Species of Animals Eat Modern Species of Plants and/or Animals?

One of the most recurring elements of paleofantasy is anachronism. For instance, this still is from the 1966 film One Million Years BC, and yes, that is a Triceratops fighting off a Ceratosaurus, a ...
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9answers
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 ...
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1answer
202 views

The 42-Hour Day: Instant Extinction?

The information presented in the previous episode is out of date. In an alternate universe, there is still an Earth in geochemistry only. This one, Alternate Earth 600, is a "backwards Earth"...
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2answers
175 views

Would Plate Tectonics Act Differently on an Earth-like Planet Where Water Makes Up the Minority of the Surface Rather Than the Majority?

My apologies for the extra long title, so let's get to the point. There is an Earth-like planet with a very dry personality. Six to ten percent of the surface is water, averaging in at 30-100 meters ...
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0answers
69 views

How Long (Or Short) Would Human Limbs Be if Proportioned Like Those of Gibbons?

Here is what I've got on Reddit about how long human limbs are in proportion to the lengths of their bodies: With regard to humans, in ideal proportions, an adult is 7.5-8 heads tall. The legs (...
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2answers
217 views

What Would the Arctic Ice Caps Look Like in This Current Map?

This is a map of my alternate Earth with a focus on ocean currents, courtesy of Mikael Asikainen: As you can see here, Greenland looks smooshed, but that is because it is arranged to the extent that ...
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1answer
63 views

Would This Chosen List of Animals Occupy the Earthworm Niche?

To say that the earthworms are essential to the health of the planet Earth would be a gross understatement. So much so that there is no way that I can list you all their benefits at once. But what ...
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3answers
370 views

How Would a “Lungshark” Breathe Out of Water?

Allow me to introduce to you the epaulette shark: This one species stands out over the other 511 in that it can breathe out of water. How? It actually has several adaptations: They slow down their ...
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2answers
147 views

The 42-Hour Day: Episode I: Ocean Currents

Presented here is a map of an alternate Earth from 542 million years ago. It is 5% narrower in diameter and 20% lighter in mass than our Earth. A single day lasts 42 hours, a cycle that it must ...
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4answers
3k views

How would human civilisation develop with little iron?

Imagine a planet that's identical in pretty much every aspect (including Homo Sapiens) to our own current Earth, with only a single exception - the continental crust has, for whatever reason, much ...
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11answers
4k views

Biological duck tape - how does it grow and how did it evolve?

Imagine vast areas covered in sheets of a (preferably grey) biological waterproof material that is stuck to the rocks below it. Humans come along at harvest time and cut these sheets into strips, peel ...
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1answer
144 views

How to Terraform a Dead Earth

In the foreseeable future, a scientific community has discovered an alternate universe in which the solar system centers around a binary system of G-type suns, unlike the one G-type that ours orbits. ...
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7answers
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 ...
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5answers
400 views

What do I need to consider for a justice system for powered people by powered people?

In one of my stories, there are people with powers. Inherited from parent to child or through accident and experimentation. There's the main government like ours, and a para-military agency ...
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3answers
201 views

Giant bugs part 1: nature

So a little bit ago I asked a question that asked multiple questions so my new strategy is too ask multiple questions. First off this first question is going to revolve around the bugs themselves and ...
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4answers
165 views

Would more options of the death penalty be believable to present day audience and setting? [closed]

In one of my stories, my MC is a spy and has an ability to come back from the dead (but can't reveal such a fact) and after her first murder (she got killed by a mole and had her arm cut off with an ...
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0answers
121 views

A fictional world where morals and ethics are completely reversed? [closed]

I want to create a world that exist in an alternate universe where all ethics and moral behaviors on earth are completely reversed/backwards. What would society in this alternate world look like?, to ...
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3answers
121 views

How Cold Will Earth's Equator Be at a Martian Distance?

At 93 million miles from the sun, Earth is in a perfect place for liquid water to exist, which is crucial for the evolution of life. Currently, it averages in at 14 degrees Celsius (57 degrees ...
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2answers
286 views

What would happen to the moon if Earth shattered?

In relation to one of my questions, Earth was destroyed after hit with a weapon that tore the planet apart by magnetic and gravitational force which does leave a large segment left floating. The rest ...

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