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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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If Earth's Core had ALL Of the Heavy Metals

Back home, Earth had gone through an impact-coalesce cycle only once. Since then, its core has been 84% iron, 6% nickel and the rest being labeled by The Encyclopedia of Earth: A Complete Visual ...
JohnWDailey's user avatar
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10 votes
2 answers
695 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. ...
JohnWDailey's user avatar
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18 votes
10 answers
2k views

Is there a way to have coal but not oil?

Reading this answer I realized that for my purposes I don't really want a fully steampunk world. All I want is lack of cars and planes as we know them, and lack of oil, or inaccessible deposits of oil,...
Mołot's user avatar
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17 votes
5 answers
4k views

Could deliberately induced Kessler Syndrome stop ICBMs?

In a previous question I asked how Mutually Assured Destruction could be made not assured. Most of the highly rated answers focused on political methods, but one answer raised the possibility that ...
walrus's user avatar
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13 votes
19 answers
4k 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/...
Sheikchilli's user avatar
7 votes
2 answers
837 views

The World's a Jungle Again. Would Doldrums Blow the Global Air?

From 56 to 34 million years ago, Earth was so warm that we have found evidence of jungle plants inside the Arctic Circle. Nowadays, jungles are confined in or near the equator, and those latitudes ...
JohnWDailey's user avatar
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13 votes
5 answers
1k views

An Inverse Great Dying

252 million years ago, the worst event in the history of life on Earth occurred. 70% of all terrestrial species and 96% of all marine species became extinct through, according to geological records, ...
JohnWDailey's user avatar
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13 votes
13 answers
2k views

In a world of groovy super spies, how would a spy cross a ravine?

I'm developing an alternate Earth where super spies exist. Men and women of extraordinary skill with extraordinary gadgets who act in extraordinary ways to protect the proverbial "King and ...
JBH's user avatar
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6 votes
5 answers
620 views

Avian Crocodylomorph

Today, dinosaurs, alligators, crocodiles, gharials and caimen are all that remains of a special group of reptiles called the archosaurs. Recently, it has been accepted by the public that birds did ...
JohnWDailey's user avatar
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4 votes
1 answer
370 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 ...
Astrid_Redfern's user avatar
33 votes
16 answers
6k views

How could mankind of ancient times cause significant climate change?

They don't posses any advanced knowledge, their knowledge is in fact irrelevant, just their possible actions (it doesn't matter how irrational those actions might be) that would cause significant ...
user1878648's user avatar
33 votes
10 answers
6k 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, ...
rwallace's user avatar
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24 votes
5 answers
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 ...
JohnWDailey's user avatar
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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....
Slarty's user avatar
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9 votes
2 answers
218 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 ...
John Doe's user avatar
  • 363
8 votes
1 answer
704 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 (...
rwallace's user avatar
  • 4,906
8 votes
2 answers
321 views

Ice coverage of a horizontal torus planet

How much ice would a torus planet be covered in if it rotated horizontally without a tilt such that its inner region never sees sunlight? It's basically earth but as a torus and a completely '...
Rubrikon's user avatar
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8 votes
5 answers
2k views

Is there dense, non flammable gas that I can cover the Earth in?

This question is related to Deadly, Heavier than Air Gas, and Is a world with two different types of air possible? but has several different criteria. I've also looked at https://chemistry....
walrus's user avatar
  • 3,529
8 votes
5 answers
2k views

Possible height and size of a giant tree on an Earth-like planet?

I'm working on a story about another dimension of this same Earth but without the same human development and history. The land and natural conditions would be the same except for the ones directly ...
Sombrapluma's user avatar
7 votes
2 answers
446 views

Climate conditions and/or atmospheric changes required for the Everboom

Relating to this question: Ensuring an endless war, and an endless stalemate In a planet such as our Earth, what climate conditions and/or atmospheric changes would be required for the formation and ...
Nahshon paz's user avatar
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7 votes
2 answers
419 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 ...
JohnWDailey's user avatar
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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 ...
Slarty's user avatar
  • 37.6k
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. ...
Comrade_Frunze's user avatar
5 votes
2 answers
313 views

All the Radioactive Metals Inside Earth's Core--How Would They Affect Convection?

In relation to a recent question of mine, this alternate Earth still has its core consisting of 84% iron, but the other 16% contains the greatest concentrations of all known species of heavy metals (...
JohnWDailey's user avatar
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5 votes
3 answers
2k 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. ...
chasly - supports Monica's user avatar
5 votes
5 answers
530 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 ...
JohnWDailey's user avatar
  • 14.5k
4 votes
2 answers
579 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, ...
JohnWDailey's user avatar
  • 14.5k
4 votes
1 answer
389 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 ...
Slarty's user avatar
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3 votes
3 answers
257 views

Can A Theia-Like Object Make Earth Richer?

Let's start with a little backstory--our planet underwent an impact-coalescence cycle only once, 4.5 billion years ago, when a Mars-sized object named Theia destroyed the infant Earth in a glancing ...
JohnWDailey's user avatar
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3 votes
3 answers
1k 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 ...
SKKennell's user avatar
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3 votes
1 answer
87 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 ...
JohnWDailey's user avatar
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2 votes
2 answers
260 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 ...
JohnWDailey's user avatar
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2 votes
1 answer
392 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"...
JohnWDailey's user avatar
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1 vote
6 answers
529 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 ...
SKKennell's user avatar
  • 1,713
1 vote
5 answers
311 views

Can Pinnipeds Fit in a Worm Forest?

In an alternate Earth, coral has been extinct for over 400 million years. In their place were the following: Bivalvia (clams, oysters, mussels) Cirripedia (barnacles) Canalipalpata (bristle-foot or ...
JohnWDailey's user avatar
  • 14.5k
1 vote
1 answer
200 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 ...
JohnWDailey's user avatar
  • 14.5k
-1 votes
1 answer
467 views

The 372-Day Calendar

There seems to be a connection between orbital revolution (one year) and distance from the star the body orbits. For example, Earth orbits the sun at a distance of 93 million miles and completes one ...
JohnWDailey's user avatar
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