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
175 views

What Else Could Reduce Global Sea Levels?

Anyone who has studied ice ages would know that during the last two-and-a-half million years of Earth's history, there have been periods where there was enough ice to suck up a lot of water. As a ...
4
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0answers
83 views

How Would These Planets Affect Earth's Eccentricity?

A cleaner, narrower-focused improvement of How This Alternate Solar System Influences the Milankovitch Cycle, so not a duplicate. For further clarification, eccentricity is the shape of a planet's ...
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0answers
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What Kind of Bolide Would Chicxulub Be to Create the Bigger Airburst--Asteroid or Comet?

66 million years ago, something brought an end to the long-established dinosaur empire. The pendulum just kept shifting between an asteroid and a comet, astronomical bolides that actually have ...
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1answer
98 views

How to have hollows with complex plant and animal life on a planet

This is a slight continuation of my other post where I was trying to create realistic hollows with weather due to temperature changes due to bio minerals called Hearthstones. I was wondering if plant ...
15
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4answers
687 views

Assuming a flat world and no obstacles, how far could you see?

I know this question has been asked in similar places, but I'm after a specific part of the problem. Assuming the following: Perfectly flat, infinite world Earth's atmosphere Sun directly overhead of ...
5
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2answers
270 views

How to Make This Alternate Earth as Black as The Dark Knight

"The Dark Knight" is a nickname given by astronomers to the exoplanet TrES-2b, a gas giant with an albedo of one percent, blacker than paint, blacker than coal—in fact, blacker than anything on Earth! ...
11
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4answers
149 views

Utility of a domesticated dwarf elephant

In prehistoric times, there used to be a dwarf elephant species in many Mediterranean islands. They were about 1.5-2 meters high, but probably became extinct before the arrival of the first human ...
4
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1answer
202 views

Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands?

Short version A far future catastrophe burns/melts away large chunks of the Earth and Moon. For reasons related to my story's fantasy elements, the remains of the Moon have about one fifth their ...
1
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2answers
102 views

How Big Would We Be in a Venus-Sized Earth? [closed]

In the foreseeable future, we have found an alternate Earth with the same gravity, width, density and mass as Venus, but the core and atmospheric pressure are the same size as our Earth's. Since it ...
1
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4answers
502 views

Is it possible to live as a skeleton? [closed]

I'm designing a world that takes place in life after death. This place is like a parallel to our world, a worse version of it. Everybody here is a skeleton, their consciousness are loaded in their ...
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3answers
95 views

A Horse of Many Different Colors…Out in the Open Plains

In mapping the ecology of an alternate Earth where the family Equidae still exists but the genus Equus does not, it is usually difficult to find a biologically suitable mythological horse as a ...
2
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2answers
75 views

How Would a Merpanther Hunt?

Allow me to present the Brethmechin, a creature of Indonesian mythology. The Book of Creatures website has drawn it as some kind of felid that has adapted for complete marine hunting, rather like the ...
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3answers
2k views

Could Cats Add Lots of Plants to Their Diet?

Because nature is never straightforward, there are different levels of carnivores. On the lowest rung of the ladder are the hypocarnivores, in which meat can't take any more than 30% of their caloric ...
4
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2answers
98 views

How to Renew Old Mountain Ranges

Conventionally, there are two ways to build mountains--direct collision (as is the case with the Himalayas) and one side sinking beneath the other (which explains why the Pacific Ring of Fire is ...
3
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4answers
206 views

The Fate of Marsupials in a More Southerly Australia

For the longest time, Australia and Antarctica were one and the same. It wouldn't be until 30 million years ago that Australia broke up from Antarctica. Nowadays, the distance between Australia and ...
6
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2answers
116 views

Perissodactylian Cetaceans

Perissodactyla is an order of mammals consisting currently of the seventeen species of horses, rhinoceroses and tapirs. Usually, any clade is connected by a coupling of genetics and physical ...
5
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4answers
377 views

A Horse of A VERY Different Way to Live the “Plains” Life [closed]

How the horse evolved to deal with life out on the open plains is...an odd story. Whereas other ungulates could walk through the hard ground with several hooves without problem, the horses couldn't. ...
3
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4answers
472 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 ...
8
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1answer
164 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
128 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 ...
6
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1answer
238 views

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 ...
2
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2answers
117 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
189 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 ...
4
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3answers
121 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
136 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
125 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
86 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, ...
4
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5answers
184 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
126 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
54 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
78 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 ...
6
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2answers
267 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 ...
2
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3answers
187 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
277 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
277 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
248 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
266 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 ...
5
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2answers
539 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
270 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 ...
5
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3answers
924 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
249 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
170 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 ...
2
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4answers
222 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/...
1
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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 ...
8
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2answers
150 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 ...