Questions tagged [reality-check]

Asks if a given concept is realistic in a given context. Answers should say yes or no, with supporting info. Compare this with the science-based and hard-science tags. This tag should never be the only tag on a question, because this tag frames how a question should be answered, not the topic.

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Method of expanding a city in toxic environment

A city on an alien desert needs to expand, here is the method I feel should be cost-effective and cheap. Use the image below for reference. A square area is mapped out and leveled off for the ...
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  • 5,864
1 vote
3 answers
106 views

Utilizing Pain for Nourishment [closed]

Welcome to the Sanguine Jungle! This scenic location features many beautiful and amazing sights that you just won’t find anywhere else. Carnivorous plants? We got ‘em! Man eating beasts? Hiding in ...
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2 votes
5 answers
580 views

In this alternate history, what great 19th century mind would most likely create the first nuclear powered engine?

I’m bringing nuclear power to the 19th century and need to know who had the tools and connections to become the 19th century “Father of nuclear power.” Background: The Real World Raw, unenriched ...
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  • 5,864
30 votes
8 answers
3k views

What would a guerrilla band of authentic female medieval archers look like?

Historical background In discussions about European medieval archery, there is a lot of emphasis on the english longbow, and the physique and training required to field an archer of that caliber. The ...
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2 votes
2 answers
133 views

How colorful would plants and animals in a habitable planet orbiting a F main sequence star would be?

F main sequence stars are hotter and brighter than the Sun and therefore they emit more UV radiation than sun-like stars. Many scientists think that complex life could develop in planets orbiting such ...
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3 votes
2 answers
92 views

Ore/mineral hotspots in planetary rings

In my setting, there is a small, rocky ring system surrounding an earth-like habitable planet. This ring was formed relatively recently (approx. 50 million years ago) from a small moon with a Moon-...
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  • 1,165
10 votes
8 answers
2k views

A forcefield only penetrable by humans?

In the not-too-far-away future during a nuclear winter, one city survived by being sealed under a dome forcefield (?) protecting them from the cold weather and potentially harmful sunrays once the sky ...
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  • 101
4 votes
2 answers
777 views

Existence of life using sulfur instead of oxygen

All life on earth (or at least most of them) require oxygen, at least to form the organic molecules that build up life. We know that sulfur has similar chemical properties. Organic compounds that ...
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3 votes
1 answer
82 views

Cobalt chemosynthesis?

I want to create a world where everything revolves around cobalt and I was wondering if there are autotrophs that receive energy due to chemosynthesis involving cobalt compounds, is it possible?
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  • 41
3 votes
1 answer
145 views

How could my hybrids from species of the same genus with radically different appearance have more fertility issues but still be mostly fertile?

I want to know if my interspecific interbreeding is realistic or a total fiction. Most animal hybrids are sterile (mostly the heterogametic sex according to Haldane's rule). Some famous examples ...
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6 votes
6 answers
366 views

Superhero lines of income [closed]

I came up with an idea for some fanfic in the DC/Superman universe. I'm not going to use the name of any DC characters, just allude to them to try to stave off any legal issues, and I don't plan on ...
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7 votes
2 answers
211 views

Plausibility of "muscle-locking" paralytic vemon?

There is a species of animal in my world with a potent venom that can cause paralysis at a specific dosage. This renders a given target unable to move for 24 hours. This venom "locks" a ...
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5 votes
3 answers
180 views

Are there animals that can choose a caste/role/ability?

Just had cool dream, mostly a nightmare that woke me up multiple times on a loop during the night, but it was so cool I forced myself to back to the same nightmare after falling a sleep again. The ...
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4 votes
3 answers
164 views

Reasonable placement of tectonic plates

Im working on this little hobby project and i've come to the stage where i want an actual world map. So id decided to use one of the mapgens out there untill i found one i was happy with: Now i have ...
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10 votes
3 answers
2k views

Could a river civilization develop in a cold desert climate?

There seems to be a trend with the oldest civilizations (Civilizations being urbanized societies with a government and social heirarchy) starting around river valleys surrounded by desert; the ...
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  • 103
11 votes
6 answers
2k views

Lead plate armor, a feasable defense against gamma radiation?

I am working on a small worldbuilding project. The world this takes place in is littered with 5,000 year old (estimate) ruins, and these ruins are full of decaying radioactive material. In most ...
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  • 381
-8 votes
1 answer
221 views

Would many parents use In Vitro Gametogenesis and Designer Baby technology to choose to have girls with Complete Androgen insensitivity Syndrome? [closed]

I have been reading about Complete Androgen Insensitivity Syndrome and from what I understood these women have features like being more beautiful and more attractive than the average, lack of periods, ...
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4 votes
1 answer
154 views

Is terraforming of Europa going to make Jovian system much more dangerous?

I’ve terraformed Europa. The now oceanic moon with floating islands was given thick atmosphere (pressure, thickness and composition to be established later, but I’m aiming at something thick, murky ...
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  • 546
2 votes
1 answer
186 views

Creating stable gravitationally bound alternatives to a single ultra massive galaxy?

Before the accelerating universe makes it impossible without FTL to reach other galaxies the advanced civilization in my story aims to create their own super system, which will remain gravitationally ...
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17 votes
5 answers
3k views

Ecological niche of a horse sized wolf

In many fantasy settings, soldiers (generally orcs) ride on wolves the size of horses, plundering and raiding to their hearts' content. The only issue I see with this image (aside from using a ...
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  • 3,209
9 votes
3 answers
939 views

Can a larger mass of stellar engines move a galaxy's dark matter?

There have been ideas about moving galaxies, if all of the needed stars and black holes become stellar/black hole engines but due to the 1:5 ratio of matter and dark matter there will not be enough ...
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-5 votes
2 answers
126 views

How could people handle arachnophobia in a world where spiders have the size of pets? [closed]

I am thinking about an alien planet where most species of spiders are the size of cats and dogs and the biggest of the most rare species are the size of a car. In this world there is the same ...
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2 votes
4 answers
445 views

The Jumbled Jaunts of Jormungandr: How predictable is the Snakebot of Doom being? [closed]

Jormungandr, the Snakebot of Doom has left New York. The world's armies and air forces have been decimated and cannot stop it. It has moved on from New York, and has flattened the following North ...
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  • 45.4k
7 votes
1 answer
151 views

Can a creature have an endoskeleton made of cellulose?

I've been doing research for my speculative evolution project, and I am currently mapping body plans for the main lineages of organisms I'm going to feature in this project. One of them has an ...
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4 votes
3 answers
186 views

Is this method of “burial” possible?

Now that colonization of Mars and The Moon is starting to pick up, lots more people will start dying. LifeHarbor Burials™ says that they will provide a way to dispose of the dead for free. They claim ...
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  • 2,103
3 votes
4 answers
332 views

How realistic would a city of over ten million people in an area of less than 100 square kilometres be?

I have been playing Cyberpunk 2077 on my PS4 and Night City in the game has almost 7 million people and an area of just 75 km2. It is very dense with suspended streets and highways and giant buildings ...
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5 votes
3 answers
189 views

How many people can be evacuated from Boston before it is flattened by the Snakebot of Doom?

Jormungandr, the Snakebot of Doom, has left the rubble of New York from where it has just finished destroying all the world's petroleum refineries and metal smelters, and has just made a right-hand ...
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  • 45.4k
9 votes
3 answers
209 views

Is a biotechnology-only civilization actually possible?

Countless times in science fiction I have seen civilizations that rely exclusively on biotechnology; These societies, often due to environmental factors, never invented certain basic technologies such ...
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3 votes
1 answer
82 views

Can reconnection of continents be sufficient reason for the evolution of sapience?

So, the process that began the evolution of sapience in humans was ultimately triggered by a changing climate forcing chimpanzees into a drastically new habitat; I am trying to write about a race of ...
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0 votes
0 answers
29 views

How could the equator remain frozen? [duplicate]

If possible, what would need to be different for earth's equator to freeze over and remain that way? Here's what we know about the frozen ring: The temperature is below freezing for at least a few ...
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18 votes
8 answers
6k views

Would "new" clothes from 40 years ago be readily wearable?

Background This question is set in a story where the Yellowstone supervolcano exploded 40 years ago (possibly others, doing research on it) during "The Mining Incident," and following this ...
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  • 191
0 votes
1 answer
122 views

Power Crystals for a more primitive time

A recent coment on my Bloodless Sword question got me thinking: Could you make a "power crystal" out of radioactive particles suspended in crystal formations? In counless Sci-Fi sieres, like ...
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4 votes
2 answers
96 views

Scuba diving in the Permian Seas - effects on pre-dive calculus and commercial diving

I'm designing a scuba-diving expedition in the Permian sea Panthalassa. Pre-dive planning for the optimal gas mix and critical pressures requires factoring in gas available but also readings on the ...
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3 votes
1 answer
124 views

Just How Omnipresent Would Cheap Cross Laminated Spider Silk Be?

In this timeline's equivalent of medieval level development, spider silk is dirt cheap, and cross-laminated sheets of spider silk are quite affordable. Portia jumping spiders were domesticated ...
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  • 1,916
-1 votes
1 answer
213 views

Would android women be a better companionship and better sex partners for men than "real" women? [closed]

If robotics become advanced enough for the creation of humanlike androids( mentally and physically indistinguishable from flesh and blood humans) become possible in an affordable way for the average ...
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5 votes
7 answers
650 views

How would Air adhesives work? [closed]

Exactly the question. How would glue or tape be able to stick to gas substances and remain "hanging" there mid-air.
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13 votes
17 answers
3k views

Why to not create a warrior species if you can?

Inspired by the question Creating a Species purely for Warfare, there are plenty of reasons why someone who has the capability to create their own warrior race/species would want to do so... a rapidly-...
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-2 votes
1 answer
159 views

How common are men with feminine features and gynecomastia in a future where gender roles has become obsolete? [closed]

There is already a trend that gender roles are not as "serious" as they used to be and the criminalization of homophobia (here in Brazil at least) has helped many men to express femininity ...
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4 votes
3 answers
129 views

Accidentally detonating Titan?

In my story, humans colonize Titan, the moon of Saturn (for religious reasons). While complete terraforming is out of reach, they decide to try and make the atmosphere (which is already similar to ...
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7 votes
2 answers
157 views

Agriculture on a 15th century era Tidally locked Planet

What would humanity's most reliable method for food look like on a planet where the sun never sets, great winds raged across the land, and large-scale storms were commonplace? I'm curious if large-...
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  • 212
3 votes
4 answers
154 views

What's the point of building a Dyson sphere if you're going to mine everything in a stellar system?

This is a follow-up question to Building a Dyson sphere while preserving moons/other objects?. User @Goodies answered my question with opting to harvest nearby stars. The problem here is that ...
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9 votes
6 answers
541 views

Using a Royal Harem as a Bureaucratic Corps

Scribes and other literate administrators were a hot commodity in the ancient world. Whether they were Confucian Scholar-Gentry or Catholic Monks, the pre printing press world made whole social ...
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  • 7,698
6 votes
3 answers
1k views

Feasibility of a Cannibalistic Army? [closed]

Among humans cannibalism has been practiced as a funerary ritual within numerous cultures across the world, and also as a way of ritualistically degrading defeated enemies, as was done most notably ...
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  • 7,698
0 votes
3 answers
118 views

Is this scenario possible? How can it be done?-Dyson sphere replaced by gas giant star

Scenario: "...Regino is a gas giant approximately the size of Saturn, and three moons, Reo, Gei, and Tan orbit it. All three are small, rocky bodies a half to a quarter the size of Earth's moon. ...
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  • 577
3 votes
3 answers
78 views

Could an ecosphere realistically survive in space long enough to plant life on a new celestial body

I’m not taking about the ecospheres by the brand “ecosphere”, but the type you see on the channel life in jars. These type of ecospheres are essentially a sealed clear container with water, dirt, ...
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  • 2,103
2 votes
5 answers
272 views

How could a shrink ray work?

I'm working on a novel, which involves a shrink ray. Kind of like the one in Honey I Shrunk the Kids, and involves a small Laser-esque (or Laser) beam that shrinks the thing it hits. Problem is, it ...
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  • 1,051
0 votes
3 answers
151 views

A pill that "pauses" the worsening or healing of a condition

It was 2050 when scientists discovered a pill that can temporarily "pause" the change of a condition. After taking it orally, the condition of the patient stays unchanged for some time. ...
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  • 1
4 votes
1 answer
129 views

UBER-BAMBOOs: The Baobab Bamboo

I want a tall tree. But I also want a fat tree. And I want a fast tree. Now, tall and fast are covered by one plant that I have in mind: bamboo. Fat is covered by another: Baobabs. I want a tree/grass ...
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11 votes
7 answers
2k views

Building a Dyson sphere while preserving moons/other objects?

Humans want to build a Dyson sphere around the Sun. They have noticed that Ganymede's icy composition would be perfect for mining to get the icy resources needed to build the sphere, or Mercury could ...
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3 votes
8 answers
790 views

How would a species in a world where magic is banned also ban Science? [closed]

The people in my world who can't use magic are at war with the people who can use magic. Both groups used to be at peace before political and global conflict started, and long before they were at war ...
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