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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3
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4answers
437 views

Are two Pangeas possible?

As we know, the Earth had one super continent at one point in the history of our planet, which eventually broke apart to become what we have today. Assuming we're talking about a planet near ...
7
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1answer
102 views

Planetizing the World of Jack and the Beanstalk: How Small is Too Small?

We all know the tale of Jack and the Beanstalk--a farmboy sells his cow for some "magic beans", which in turn grow into a mountainously tall stalk that led him to the land of a giant. Now, ...
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4answers
119 views

What could hinder a highly developed species from erasing humanity from the surface of earth? [closed]

Sorry for my poor English. Me and google translator are doing our best to translate my question properly. My story evolve around sentient planets. Let’s imagine every Planet in my universe is ...
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1answer
170 views
+250

Could Bear-Dogs Look and Act Like Actual Bears?

Back home, Amphicyonidae (bear-dogs) predated Ursidae by only four million years. While the latter still lives in the form of eight species, the former had been extinct for two-and-a-half million ...
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2answers
114 views

Bryophitic Plants in an Underwater Forest

By "bryophitic", I mean "non-vascular land plants", being the liverworts and the mosses. (Hornworts are comparative latecomers, so we won't be talking about them.) Without vascular tissues, these ...
8
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1answer
133 views

The Great Oxidation Event…Artificially Imposed on a Tharn-Like Alternate Earth

From 2.4 to either 2.1 or two billion years ago, Earth underwent a surge in a waste product that we know as "oxygen". Before that, life thrived in an ocean rich with iron under an atmosphere loaded ...
5
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3answers
108 views

Wolves and Hyenas--Allies For Life

In recent years, we have found evidence in the Negev Desert of the Middle East of a striped hyena, a solitary carnivoran, tagging along with a pack of wolves. This sort of alliance is found nowhere ...
7
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1answer
111 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 ...
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3answers
119 views

Pinniped Creodonts

Here is all you need to know about the creodonts: They were a group of carnivorous mammals that, despite having carnassials, had no relation to Carnivora. They were a global force, occupying ...
2
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2answers
85 views

Can Owl Ears Instead of Echolocation Guarantee Life in Cave Colonies?

In an alternate Earth, there are no bats. Instead, there are "flying monkeys" (which are actually lemuriform primates, rather like bushbabies or lorises.) And even though they have batlike ears, ...
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5answers
176 views

The Itsy-Bitsy Insect Has Made a Web. How Differently Would it Look From Spider Web?

In an alternate Earth, a mass extinction wiped out a percentage of the most successful phylum ever--Arthropoda. All that survived of the class Arachnida were the really small varieties--the ticks, ...
4
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1answer
113 views

How to have habitable hollows on a planet

In the world that I am making there are hollows all over the planet, which are massive underground subterranean areas of the planet. Think The Hollow of the Gears Of War series. So far the going ...
2
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0answers
52 views

The Marine Jungle of More Than Just Angiosperms [closed]

Recently, I asked whether or not the other plant groups besides the angiosperms could evolve to adapt to being submerged under salty ocean water 24/7. While marine conifers, ginkgoes, cycads, ferns, ...
7
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1answer
76 views

Could a Greater Number and Diversity of Marine Plant Species be Possible?

As landlubbers, we often let ourselves think that if salty seawater is undrinkable for us, it could be even worse for plants. However, certain types of angiosperms have found ways to not only thrive ...
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2answers
253 views

Will the Dinosaur Empire Still Stand Strong If Chicxulub Hit Earth at the End of the Jurassic?

66 million years ago, the dinosaur empire was in its death throes when its final nail in the coffin came hurtling down from the sky. A clump of rock the size of Mount Everest smashed into the Gulf of ...
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3answers
184 views

How can I alter the human reproductive cycle in order to compete on a hostile planet?

This is a follow up question to one that I made earlier. Basically, after God wiped out all life after the flood, earth has changed into a lush but dangerous environment. Every living thing, from ...
24
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5answers
3k views

How To Make Earth's Oceans as Brackish as Lyr's

Allow me to present Lyr, one of a handful of worlds crafted by artist Chris Wayan: The one detail among a vast many that is important to this question is that its salinity is about 1.5%, roughly half ...
5
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5answers
268 views

Earth Has Four Seasons Lasting Years. Is This Too Much?

In this alternate Earth, the axial tilt is still leaning to the extent of the temperate and polar zones having four seasons--spring, summer, autumn and winter. The one key difference is that each ...
8
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2answers
263 views

Nocturnal Photosynthesis

It's a basic fact that most plants need sunlight to generate growth. Sure, they also need water and nutrients, but their reliance on sunlight is the one sole thing that separates them from animals. ...
5
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2answers
227 views

Humanity with the Ears of a Fox--What Differs as a Result?

In this question, we're looking at a humanity that has adapted one of the most conspicuous ways of keeping cool--larger ears. Desert animals usually have larger ears to have more room for blood ...
4
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2answers
246 views

If Earth Were a Gas Giant's Moon

Here is what we know of Earth: Mass: 5.972 sextillion metric tons Diameter: 7,917.5 miles Density: 5.51 grams per cubic centimeter Rotation: 24 hours Revolution: 365 days Core: 760 miles wide, ...
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2answers
2k views

Could a planet have a naturally occuring moon at one of its Lagrange points?

Would it be possible for a planet to naturally have a moon or large natural satellite at one of its Lagrange points? If so would it then also be able to have a second moon that would be orbiting this ...
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2answers
513 views

Can Apes (Including Humans) Be Naturally Patterned Like Felids?

For visual reference: Apes are visual species who rely more on their eyesight than any of the other senses. As a result, they see the world in three shades of color, whereas other mammals see in one ...
2
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4answers
265 views

Is a partial civil war possible? [closed]

I have a fictional world, consisting of a federation of 17 provinces (in blue on the map extract). Currently, it is in the late 1920's. The Dzevogurski and Quidthovitse provinces are on the brink of ...
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3answers
920 views

Complications of displaced core material?

If there were an absolutely terrible accident, and part of Earth's core was displaced toward the surface, making a bubble of liquid nickel and iron, what would be the major problems with this?
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2answers
236 views

How Would Plate Tectonics on an Inverted World Work?

Recently, I came across an inverted world map on the MapPorn Reddit made by MChainsaw. "Inverted" as in, the "continents" are now below sea level and the "ocean floors" are high and dry. (...
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13answers
6k views

Is this state of Earth possible, after humans left for a million years?

It is the year 4056 (or probably later). The rocket with the last residents of Earth just took off, because global warming and pollution couldn't be stopped nor reverted and Earth became uninhabitable....
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1answer
169 views

Do any of the things happening on this world actually have a chance of happening? And if they do, how long would humankind survive? [closed]

In this world, global warming has reached a tipping point. The equator has reached temperatures well over 212 degrees Fahrenheit (100 Celsius, 373 Kelvin), resulting in the "Boiling Sea". Global ...
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4answers
210 views

Which Modern Mammals Would Die Out in an Alternate Extinction Event 5 Million Years Ago? [closed]

Five million years ago, a progressive downward slope in the global climate put an end to the Miocene Epoch and brought on the Pliocene Epoch. To get a visual idea, since we humans are a visual ...
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18answers
3k views

What aspect of planet Earth must be changed to prevent the industrial revolution?

I am thinking of a planet (I suppose one would call it a parallel earth) where the industrial revolution never happens, and people live with 1700s technology forever. What differences in resources/...
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0answers
59 views

Would it be possible for an analog of humans to evolve in the oceans - Specifically Octopoids? [duplicate]

Humans are tool users and through their ingenuity were able to hunt much larger animals than themselves. Specifically, I would like to have a race of sentient beings based on octopuses. They use ...
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2answers
148 views

What geological and chemical changes to the earth's makeup could effectively limit technological advancement

Basically, I want to freeze the technology of earth at a level reminiscent of pre-Industrial Revolution Europe. I'm trying to figure out what substance or material would have to be absent from the ...
3
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2answers
114 views

How would an Earth-like world that is packed solid work?

By packed solid, I mean it has very fast growing vines and bushes everywhere like on non-desert living land plus lead crud and hidden small holes so movement is severely restricted. Similar on ...
5
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2answers
169 views

Would a More Extreme Icing of Antarctica Create an Extinction Event?

55 million years ago, the world was literally a jungle. It was so warm that plants like the bald cypress and the dawn redwood have been found at Ellesmere Island, right inside the Arctic Circle. ...
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3answers
119 views

Government power in an Ice Age [closed]

The setting of my story takes place during a future Ice Age, where the equator and parts of the southern hemisphere are a safe haven for humans. Which countries or regions would most likely be the '...
2
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1answer
274 views

Only changing the mass of the moon, how much can lunar mass increase before the Earth becomes uninhabitable?

Bonus: How much would the increase in lunar mass increase average tides? & which factors would cause the Earth to become uninhabitable?
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3answers
129 views

What Else Could Create Jeffrey Linn's Coastlines BESIDES The Influence of Ice? [closed]

Who? Unfortunately, I could not find any background information about Jeffrey Linn, but he is better known for his sea level maps. Specifically, what a particular city would look like if sea levels ...
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2answers
119 views

How to make my shadowrealms respected [closed]

My world is collaborative post between me and my friend. So, There is one nation that I'm fleshing out and it was overall a fun but I got writer's block. Most of the evil shadow empire have ...
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5answers
118 views

How Can the Coastlines Look Similar In Spite of the Cooler Temperature

The established fact is that the shape of a planet's continental coastlines is determined by the planet's climate. Higher temperatures mean less ice, which ultimately means higher sea levels. (Case ...
0
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1answer
337 views

How would floating islands work? [duplicate]

Soaring among the clouds over an earth-like planet, islands... on which fortresses are built for strategic advantage, on which stations for the dragon air force are built, and which can be relatively ...
2
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4answers
195 views

Is it plausible that a world could develop that focused on the hard sciences and not the soft sciences? [closed]

I am new to this so I may ask this question wrong or without enough detail. The world I am creating goes like this: Humans developed to the point that robots run basically everything via A. I.s. As a ...
1
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1answer
220 views

Electric muscles

There is a popular belief that the muscles of our body are controlled only by electrical impulses. This is not entirely a lie, but ... From what little I have researched, the nerves send a command for ...
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3answers
743 views

Building a full-sized Lego Earth - what would it look like at various levels?

Lego representations of Earth have been made at various scales, for example this one: Suppose Slartibartfast made a full-size Earth from Lego (including the oceans being represented as solid blocks. ...
5
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3answers
235 views

Could Multicellular Life Evolve Sans Cryogenian?

Prior to the Cambrian, there have been three separate ice ages--the Huronian, from 2.4 to 2.1 billion years ago; and the two Cryogenian ice ages, from 720 to 635 million years ago, split in such by a ...
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6answers
409 views

After evacuation to a new planet, how would a population switch from a barter system to a monetary system with banks?

Okay, context. There's a modern human sub-species (about 9,000) that needs to evacuate earth to avoid genocide from their human counter-parts. They have access to a portal to take them to a new viable ...
8
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1answer
302 views

Is this a plausible timeline if the United States legalized prior restraint following the Pentagon Papers?

In actual history, the Supreme Court ruled in 1971 in New York Times v. US that prior restraint is illegal, upholding its earlier decision in 1931 in Near v. Minnesota. In my alternate history, the ...
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2answers
1k views

Humans without fire?

Suppose anatomically modern, but technologically primitive, humans (say, early Paleolithic) were magically transported to a world broadly similar to our own, but where open flames are impossible. (I ...
5
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4answers
197 views

How to make a floating islands on future earth?

So my current book set in distant future on earth where earth surface only covered with oceans with no more land mass ( kinda like a water world ) and the only lands are floating islands that made ...
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6answers
483 views

Can magnetism be what causes my flat Earth to accelerate?

It has been determined by observation of the stars that the gravity on Flat Earth is due to it accelerating upwards at 1G. This is what holds people and objects to the surface. It has also been ...
3
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2answers
389 views

Can Mollusks Develop Bone Independently?

When one thinks of a shelled cephalopod, odds are high that the first thing to come to mind are the ammonites. They were one of evolution's success stories, thriving from 400 to 66 million years ago. ...