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Questions tagged [cataclysms]

For questions about an event that causes a major disruption in a world or area.

5
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0answers
121 views

Effects of a close approach with a non-pulsar neutron star?

My hard-ish SF story requires an event that would effectively render the entire solar system completely uninhabitable for some time (i.e. retreating underground for a few millennia won't help), but ...
2
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3answers
214 views

What kind of extinction event could solve Global Warming?

The world I'm creating will be referred to as E. Current E population is growing exponentially, and the population will become completely unsustainable soon. Global Warming is also increasing ...
3
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2answers
402 views

Could a ~150 mile impact basin form from a small object imact?

Could a ~150 mile (240 kilometers) crater form from a small object impact? So the object impacting the site of the crater is a human shape and not able to be destroyed. The location of the impact is ...
9
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1answer
2k views

What amount of forrest-fire in square km or metric tons, would be necesary to bring oxygen levels below 19.5% that humans require to stay alive? [closed]

I read that oxygen makes up 21% of the Earth's atmosphere. I'm guessing it would take a lot of burning to decrease that level, but I am not sure how to calculate that. The problem is: Roughly 400 ...
4
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4answers
91 views

Cataclysmic cloud of asteroid bits

I am wanting my 32km x ~7.5km buried space habitat to be hit with a cataclysmic disaster which changes things from everyday life to a survival lifestyle. I would like the station to be damaged to the ...
4
votes
2answers
478 views

What would happen if a little less than half of the moon crashed into the Atlantic ocean? [duplicate]

Let's say an asteroid hit the moon and broke it in half. One half remains where the moon usually is relative to Earth, and the other half is flung at Earth near the equator, in the Atlantic ocean. ...
30
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15answers
6k views

How old do surviving children need to be to keep human civilization from failing?

This question is inspired by several similar questions on this site. The scenario: at one moment, all people above the age X disappear without a trace. How low this X can be that human civilization ...
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5answers
111 views

Destruction of space colonist's technology

Colonists from Earth colonized an exoplanet and for a few decades everything was fine, but one day Earth is destroyed by a nuclear war or whatever, so no more communication, help etc with it. Then, ...
0
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1answer
258 views

Every murderer and rapist in the world vanished without a trace. How many people is that? [closed]

In a worldwide catastrophe, every single murderer and rapist just vanished from the world at the same time. Nothing left behind, either dust, clothes, or whatever they were carrying at the moment. ...
7
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2answers
233 views

Humanity surviving on a sunless planet

My world was once analogous to our own Earth, where life evolved in the light and heat of a nearby star. Unfortunately, a cataclysmic event knocked the planet out of orbit and sent it spiraling as a ...
4
votes
2answers
241 views

How long would it take for society to readjust after half of human population suddenly ceases to exist? [closed]

How or why this happens is outside the scope of the question, but suppose one day roughly half of the human race vanishes out of the blue. The "disappearance" happens completely randomly, with no ...
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votes
1answer
146 views

All male politicians dead [closed]

All the male politicians have died in their sleep within a 24 hour period. Assuming no male will enter politics again, what will be the implications of this in different countries around the world ...
-1
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2answers
165 views

If 35% of the world's population died overnight, how far back would society be set? [closed]

The promise is a virus of some sort (TBD) takes out all the children and a percentage of adults in a fairly short amount of time (hours to days). Hand Waved (for now) as an immune system thing (...
15
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11answers
1k views

What apocalyptic event would leave a small percentage of humanity alive, but set it back a few hundred years? [closed]

Specifically, I'm looking for an event or catastrophe which happens quickly (climate change is too slow, I mean a full on cataclysmic middle-of-the-night sort of deal) leads to a near-extinction of ...
-3
votes
1answer
79 views

Oceanic Hostage Negotiation [closed]

Help! The moon was a spaceship all along, and it's inhabitants have finally woken up. They say that in order to continue on their travels, they need to take our oceans to create a bubble around their ...
2
votes
1answer
148 views

Conditions to make giant storm

In film "The Day After Tomorrow", a giant snowstorm seizes the Earth for days and freezes nearly everything. What I want to know is, that is this possible in current Earth climate and geology? It ...
-1
votes
4answers
244 views

What cataclysmic event would potentially block (or make it very difficult) access from one half of the continent to the other? [closed]

Say there is an Americas-like continent. (The western hemisphere (North America + South America), not the United States of America) A tyrant civilization that pretty much conquered the continent was ...
3
votes
1answer
180 views

After the rocks fall

In Nemesis Games, the 5th book of The Expanse series by (pseudonym) James S. A. Corey, However, scientists have stated the meteor which struck the Yucatan peninsula may have been responsible for the ...
27
votes
17answers
5k views

How would a primitive society react to a cataclysmic event that disproves their beliefs?

My novel deals with a primitive society, geographically similar to ancient Egypt, based on a planet with rings. The society, known as the Motek, have a very strong sense of order -- everything has a ...
2
votes
1answer
82 views

Large country-sized landmass transmutation [closed]

So I have a plot in a story I'm writing where a mage turns a large landmass in the middle of a continent - think something like India - suddenly being consumed by a spell and turned into a dense ...
7
votes
7answers
472 views

What event would kill most of the worlds population at the SURFACE, but spare everyone at the altitude of a commercial jetliner?

I want a realistic event to occur that kills the majority of the Earth's population. However, the nature of this event must not effect humans or machinery currently flying at high altitudes (those of ...
2
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3answers
149 views

Equipped with the knowledge we have now, what could a group of people do NOW to survive future climate-change-induced collapse of society? [closed]

Let's say that a group of people know with 100% certainty that the global society will collapse due to a climate-change-induced catastrophe by the year 2050. What actions can they take in order to ...
0
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3answers
451 views

Size of asteroid/comet compared to effect on impact

In an Earth-like world I have long pondered building up, the pre-industrial (roughly colonial) society primarily exists on a single continent, roughly the size of Africa. Another continent has been ...
9
votes
4answers
506 views

How long would it take a region to geologically settle down after a major cataclysm?

So in my story/world I have a region that is straight up destroyed...demonic magic is nasty stuff. So we have rings Ring 1 (1 is in the middle) This ring has a diameter of about 200 miles. At this ...
6
votes
1answer
393 views

Entirely too much mana from the heavens

Time period is renaissance, with the most powerful culture being in a area geographically similar to the middle east. So a cleric was trying to combat a drought in his kingdom using the power of a ...
16
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16answers
4k views

How to cause an exodus from the west coast of the United States inland?

What I Need I need to bring about a scenario where most, if not all, of the west coast has been abandoned before the alien-robot-zombie apocalypse wreaks havoc on the world. Sweet, sweet havoc! ...
4
votes
2answers
504 views

How would people left on a planet that will be destroyed react?

Today I woke up, knowing I would be saved from the destruction of the planet. Instead I learned the exact date and time of my death. My name is Joe Average. The planet I live on is part of a binary ...
3
votes
2answers
499 views

How would society react to the impending destruction of its planet?

For those who are interested, here is some background on the planets. There is a binary pair of habitable planets, which are both inhabited by sentient creatures. One is inhabited by reptilians, and ...
28
votes
11answers
5k views

A Treasure Chest for your Post-apocalyptic Children

Prior to the point in my story when the nature of the looming apocalypse becomes known, my main character acquires a large (6-foot) air-tight freezer chest, puts it (unplugged) in his basement, fills ...
4
votes
1answer
392 views

Effect of red giant phase on the Solar System

Scenario run-down. Several billion years from now, Sol has finally exhausted its hydrogen supplies and has entered the red giant phase. It has already been increasing in lumosity for some time and ...
2
votes
3answers
617 views

What would happen if every human female turned into a cat? [closed]

Imagine a future where your sister, mother, grandma, and possibly even yourself have turned into adorable cats. Science and history have given no apparent hints or evidence that this would have ...
7
votes
4answers
704 views

How much destruction could be wrought with the chemical and atomic energies in 30,000 humanoid bodies?

This question is tied to a previous question: Cataclysmic event resulting in a region of glass? In this scenario you have two armies, with a combined strength of roughly 30,000 personnel. Magicians ...
1
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1answer
150 views

Could ancient Atlantean monuments have survived a flood cataclysm?

Lets assume that in antiquity an advanced civilisation like that of the Roman Empire existed on a sizeable island the size of Spain in the middle of the Atlantic Ocean. This civilisation built large ...
0
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7answers
641 views

How to wipe out humanity within a week? [closed]

We are in a near-future Earth. Humanity does not have access to Antimatter bombs and I forbid nuclear war. What event could wipe out humanity within a week? Requirements This must not be ...
5
votes
1answer
261 views

How long would it take to choke the world in CO2, if sunlight were blocked?

Humans require a pretty particular ratio of CO2 in their atmosphere. Plants use oxygen to live, and only become net producers of oxygen when they're photosynthesizing. If the sunlight were cut off ...
1
vote
2answers
247 views

The Bubble Kingdom

Let's say a sovereign kingdom, about the size of modern Tibet, was isolated from the rest of the world through magical means, to prevent a dark god from rising up and destroying civilisation. The plan ...
13
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9answers
4k views

What kind of event could stop electricity?

I know things like bombing the major power plants and things like that could temporarily stop electricity production, but I'm talking about changing the way it works. Like we can no longer use any ...
19
votes
11answers
909 views

What cataclysm could make an entire interstellar species extinct? [closed]

I'm looking for some ideas for ways to kill off my brand of precursors. Ideally, the cataclysm is predictable well in advance and direct survival is impossible or at least highly improbable. The ...
59
votes
29answers
13k views

How would humanity enter a Dark Age?

Humans have grown fat, complacent and cock-sure of the certainty of future progress, arrogantly expecting to build minds in their own image. They even dream of building themselves a city, with a tower ...