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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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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50 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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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
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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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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
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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
276 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
191 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
52 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
109 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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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
718 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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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
110 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
178 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
143 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
184 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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161 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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59 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
209 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
59 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
345 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
139 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
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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
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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
130 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
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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
378 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
176 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
160 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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113 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
103 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
204 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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1answer
68 views

Could a new impact basin be responsible for desiccating an entire planet?

Situation: A planet similar in size to the Earth has a Eurasia+ sized continent at its South Pole. It is hit by a huge asteroid near its South Pole. This would produce a very large crater/basin. ...
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6answers
1k views

How could a world develop where it was necessary to mine all soil for agricultural use

I want to create a world were soil mining is a major industry. Imagine a vaguely Earth sized world where almost the entire surface of the planet is under, ocean, ice caps or is a hot or cold desert ...
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2answers
146 views

Consequences of a Longer PETM: The Lysocline

I've already discussed the backstory of the Paleocene-Eocene Thermal Maximum more than once already, so let me shorten this into a list of notes: 56 million years ago 5-9-degree-Celsius rise in ...
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1answer
231 views

How far could you see the Andes from the Pacific on a flat Earth?

Several questions on related subtopics of vision distance on a flat world have been asked before, but this one remains unaddressed. Specifically: The answer from Euclidean geometry would be infinite (...
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1answer
98 views

Ivory Headgear--Likely or Not?

My apologies for not giving you a larger image, but it does show you a compare-and-contrast on what horn is in comparison to what antler is. Basically, it's just a piece of bone covered in softer ...
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3answers
272 views

If the Earth would break apart, how likely would the large debris stay in orbit?

In the story I'm writing, Earth gets destroyed and the few million humans that survive go to live on another Earth-like planet. Since the destruction of the planet, the humans do visit their star ...
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1answer
49 views

Megamangrove Roots--Which Kind of Aerial Roots Would Best Support Their Large Size?

In an alternate Earth, early or midway in the Eocene Epoch, there debuted a family of angiosperm trees whose roots need to be completely submerged. As a result, the limit is that they can't germinate ...
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1answer
90 views

Could Sharks Survive a Longer PETM?

First things first, a little backstory: 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 "...
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3answers
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Would a Longer PETM Save the Creodonts and the Mesonychians?

Some 55.8 million years ago, Earth underwent a really dramatic heat wave known as the Paleocene-Eocene Thermal Maximum, or PETM. What happened, exactly? We don't know how it happened, but we do know ...
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2answers
346 views

Exploring a world with chiral biochemistry: chirality detection

Space explorers have landed on an Earth like planet and, to their surprise, the place is luscious and covered in life, to the point of resembling some earthly tropical atoll. What they don't know yet ...
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2answers
172 views

Would the Oceans in This Map Be Freshwater?

So long ago, I asked on how to make Earth's oceans as brackish as Lyr's, one of the many worlds imagined by artist Chris Wayans. The only real answer I got was something that that world had already ...
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2answers
57 views

Could an Ice Age Extinction Wipe Out All Marsupials?

Say the word "Australia", and one of the first things to come to your mind would be the marsupials. Of the 334 species of pouched mammals whose earliest ancestors witnessed the fall of the dinosaur ...
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What would the world be like if COVID-19 occurred in 1999? [closed]

You could pick whatever start date you feel is most interesting, applying the number and distribution of cases on that date to the same date 20 years ago. For example, imagine if we had the same ...
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1answer
166 views

If Earth had a smaller second moon, what would the sky look like?

I am creating a fantasy world in which Earth has a second moon with an orbit between Earth and the current moon. The orbit of this new moon is faster because it's closer to earth. I'm not much ...
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1answer
117 views

Could Long, Dense Walls of “Megamangroves” Deflect The Deadliest of Storms?

This is the world's tallest tree--the coast redwood. It can grow as high up as 115.5 meters. Any taller, and the transportation of water in its vascular tissues would not climb all the way. But in ...
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2answers
142 views

Can You Evolve a Second Pair of Pectoral Muscles Without The Need for Flight?

Somewhere on DeviantArt, there is an insightful tutorial by someone named "Uzlo" on how to create anatomically believable angels. Among the instructed details is the possibility of developing a ...