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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2answers
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Chambering pistols in PDW ammo- does it make sense?

My setting is set around the 23rd century, and for my military, I was wondering what kind of sidearms they’d use. After searching, I found something interesting: there are pistols chambered in 5....
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2answers
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Is this time travel scheme internally consistent?

I know there are similar questions, but not similar enough, and in fact, I don't remember seeing this kind of time travel in fiction. Before I start, it doesn't matter how the time machine works in ...
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3answers
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How would changing pregnancy time affect a female human's metabolism?

If humans were altered so that pregnancy lasted only 3 months, what other biological challenges would this cause? Obviously it would have be at substantial increase in calorie intake to support the ...
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1answer
35 views

Creating a new, reliable, global wind pattern using space mirrors

My basic knowledge of wind patterns are that they blow from areas of high pressure to areas of low pressure. I want to put large mirrors in space to reflect sunlight constantly onto Peru and Vietnam/...
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0answers
61 views

Why does the Grim reaper eat the death? how did it evolve? [closed]

Arcana is one of the secondary alternative energies in this world which can be used and consumed or produced and also transformed into actual different types of energy. Arcana flows naturally in the ...
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3answers
297 views

Do rivers pass through a mountain range?

So I have just begun with world-building, and this is my first map. As you can see on the map, a small range of mountains splits from the main mountains. What I wish to have is a long river that goes ...
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14answers
3k views

How can gravity shielding be defeated?

In this science fiction universe, that has somewhat tough science in it, paragravity is an established technology that is used to its fullest potential. Which lies the problem where warfare is ...
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2answers
137 views

How to convince a lot of people to enter voluntarily modelled social/country order(capitalism, communism, tribes, etc), for testing those orders? [closed]

The experiment requires 250 million people and a lifetime dedication; once in there's no way out. It consists on enclosing people in 5 artificial countries, each country with fixed rules. Each person ...
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10answers
5k views

A huge asteroid is going to hit. How many people can the world put into (mostly) self-sufficient homes in 6 months time?

Background: The 20-km (or however large it needs to be to cause the below effects) asteroid appeared out of a dimensional rift close enough and going fast enough that it will reach Earth in just six ...
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3answers
175 views

What would be the cutting power of the top of an indestructible, immovable, extremely thin force field?

There is a part of my setting surrounded by a 100-foot-tall, four-sided, indestructible invisible wall. The wall is made of all of the molecules that were in contact with the area that became the wall,...
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2answers
94 views

How would death by static shock work?

Eric von Blowfelt is a evil genius. He has an island with hundreds of minions to make his evil plans into evil action. Unfortunately, 003 (double-oh three) has entered the secret base on the island ...
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3answers
255 views

Can we have a civilization living at close to the speed of light?

Imagine many ships traveling close to the speed of light. If they diverge paths to explore distant galaxies, they could calculate their travel so that the same amount of time passes for all ships. ...
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1answer
116 views

Reality Check: Controling time to produce velocity

Background I recently had some fun watching YouTube videos about redefining the nature of gravity based on the existence and flow or "velocity" of time. (Example) and it got me thinking of ...
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3answers
402 views

What would be the structural impact of an oscillating orbit on a planet?

Notice : If you wish to know how to make an oscillating orbit with real-world physics, you can looky-look at this question which is following mine. My question focuses on the consequences of such ...
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1answer
98 views

Aircraft aluminum grade 7075 used for body armor in medieval setting

I've read a few discussion on the use of aluminum in medieval armor. There are a lot of people saying that aluminum is a bad choice for armor because it's too soft and brittle. There are many ...
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5answers
728 views

Inventions that could have come earlier [closed]

There are some technical ideas that could have been developed much earlier, changing the ancient or medieval world. A sterling example is the hot-air balloon. It was actually invented at the close of ...
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4answers
147 views

What would have been required for rockets to have dominated instead of cannons?

What would have been required for rockets to have dominated historically instead of cannons as the standard artillery weapon? There was enough of an overlap that this feels like it could have been ...
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1answer
80 views

World with only shallow waters?

Is a planet the size of earth minimum, probably even larger, plausible if it has no water depth below 70 meters?
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5answers
1k views

Is a lake formed and surrounded by mountains, foothills and plateaux possible?

Upon a given landmass I drew a lake, and surrounded it with small ranges of mountains and plateaux, so making it an enormous endorheic basin. The drainage from the highlands would collect upon this ...
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3answers
112 views

Plausibility of this submerged smelter design?

This design involves a regular smelter, housed in a large water-proof shell that completely covers it. The lower part of the shell would be exposed to the surrounding water. The shell would be filled ...
3
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3answers
270 views

Is there a culture where traditionally women fish? [closed]

I guess as far as the social aspects of worldbuilding are concerned, pretty much anything goes but I'd still like to incorporate elements that aren't far-fetched in terms of real-world applicability. ...
4
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3answers
128 views

Floating islands in a gas giant

A highly improbable mini-Neptune develops (naturally or artificially) an atmospheric layer perfectly suited for carbon-based air-breathers like us: a livable ratio of oxygen to helium/nitrogen/argon/...
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1answer
97 views

Could this idea for a dark energy prison be plausible?

I recently stumbled upon a post in /r/scificoncepts which talked about Dark energy prisons. (https://www.reddit.com/r/SciFiConcepts/comments/nd11sd/dark_energy_prisons/) To increase the expansion of ...
2
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1answer
116 views

What impact would it have had if BFCs had been adopted instead of CFCs?

In the late 1920s, Thomas Midgley, Jr. improved the process of synthesis and led the effort to use chlorofluorocarbons, CFCs, as refrigerants: to replace ammonia (NH3), chloromethane (CH3Cl), and ...
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2answers
72 views

Appearance of an Ammonia World's Atmosphere

I started the process of making artwork for an Ammonia World and realized that despite all my previous research on their abiotic and biochemistry, there was one thing I never quite settled on; what ...
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9answers
4k views

Is there any realistic explanation for Earth-like climate on a Sun-sized planet?

I know that Sun-sized planets are impossible in our universe, please, bear with me. Eastern high fantasy (xianxia) features worlds that span millions of kilometres. For example, descriptions of ...
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1answer
47 views

Is it possible for a wild parthenogenic dodo to exist in real earth? [closed]

so imagine, there's parthenogenic species of dodos that lives in a remote island with no predators or man have never set foot, it has some similar traits of a brush turkey (not an actual turkey), like ...
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4answers
176 views

Pumping Oxygen into Titans atmosphere

In the future, humans build massive factories on the moon Titan, components of which drill tunnels down to the water ocean beneath the ice surface. Assuming the ocean is there, and that it's similar ...
4
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2answers
142 views

Could bats evolve to have beaks?

I understand that pterosaurs and birds evolved from having teeth to beaks as beaks are lighter than teeth and can serve the same function. pterosaurs laid eggs, and birds currently lay eggs, while ...
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13answers
5k views

How would a group of elemental mages defend against guns and artillery of late WW1?

How would a group of elemental mages defend against guns and artillery of late WW1? War rages between two nations. Both have basically the same tech level, but one doesn't use hand held guns. This is ...
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4answers
542 views

Usefulness of launching probes to verify the existence of a hypothesized planet

In a parallel universe, humans have a 95% confidence that Planet 9 exists with the parameters given on Wikipedia. However, they have not directly observed it and plan on launching many space probes to ...
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2answers
108 views

Does a ship traveling faster than c0 (speed of light in a vacuum) emit Cherenkov radiation?

A Space Whale has been traveling from point A (let it be Sirius) to point B (let it be Vega) faster than light (FTL). Did it emit Cherenkov radiation while traveling? Cherenkov radiation is radiation ...
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2answers
109 views

Could a second Trojan moon orbit Earth, as in, a second moon orbiting Earth from the same distance as our moon?

Here's the basic gist about our moon--it's one-quarter the width and one-eighth the gravity of Earth, it's rocky, it has no atmosphere and it orbits Earth from a distance of approximately 240,000 ...
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3answers
118 views

Could an animal with eyes be patterned like an earthworm?

I have created a few creatures with a pattern based on that of the earthworm (head and foremost back-portion is dark, belly and rear is paler). Both of these creatures have eyes, and on one creature ...
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2answers
87 views

Using a wormhole to get propellant in space?

Would it be possible for a spaceship to fly through space with the propellant stored off-ship through a wormhole? The propellant-tender end of the wormhole wouldn't need to move, so the ship-end ...
3
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0answers
106 views

Effectiveness of an armour made of woven leather

In my world, one ancient culture uses a basic sort of armour made of thin, soaked leather strips which were woven together, either like thatch or like a mere weaving. Below are some pictures to ...
3
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1answer
110 views

Impact of sulfur dioxide on biochemistry

Curious artist, not a chemist, kinda dumb boi looking for some kind galaxy brains here. Okay. So. I have this planet. Its atmospheric composition is fairly earthlike: 21.6% O2, 77% N2, 0.2% CO2, 0.4% ...
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1answer
161 views

How far could a peak social manipulator go? [closed]

I'm trying to create a character with complete mastery in the skill of reading and manipulation. However, how far could one with pinnacle skill in manipulation go in terms of what they're able to ...
6
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2answers
123 views

Can any monosaccharide be used as a XNA backbone?

I'm not a chemist—I'm an artist and I occasionally write. But I'm starting to get more and more interested in xeno/speculative biology. When it comes to these things I'm pretty much just looking at ...
7
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4answers
345 views

Synchronized Galactic Timekeeping [duplicate]

I have some ideas for how to synchronize a galactic time system given the constraints of modern physics. However, my understanding of relativity is pretty limited so I was hoping for feedback or ...
2
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5answers
651 views

Black hole minefields

A civilization has developed black hole guns and Hawking Radiation stabilizers while warring with other civilizations in their stellar neighborhood. Currently, they can create black holes up to 1000 ...
12
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10answers
3k views

What are some realistic locations for a secure location high above the ground?

I am trying to work out whether it is realistic to have a collection of locations throughout a near future Earth, that are high above the ground (eg. sky, trees, buildings) but secure and either not ...
14
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21answers
5k views

How to explain why the humans in my setting limit laser weapons to large anti-tank armaments instead of miniaturizing them

So, in my world, the human’s UEN military mainly uses conventional firearms as their primary infantry weapons. However, they do have one non-ballistic weapon: the heavy, shoulder mounted M/DEW-96C ...
4
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3answers
149 views

Copying VS Battles Wiki: is it feasible?

Imagine a world where people have superpowers. Any sort, from benign ones, like being able to spray lukewarm water, and dangerous ones- like being able to turn anything from mass to energy and vice ...
9
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4answers
363 views

Are there any major problems with my creature design?

This mammal-thing is based off of kangaroos, red squirrels, dromeosaurs, cats, and of course, humans. My creature is slightly bigger than most humans, digitigrade and bipedal. It has a long, thick ...
5
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2answers
100 views

How to design a Venusian plant?

I want to design a plant-like organism that floats ~50km above the surface of Venus, where the conditions are somewhat Earth-like. I envision it to be a large photosynthesizing balloon on a very long ...
2
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2answers
66 views

Feasibility of Capturing high energy atoms and energy in electromagnetic wave in cosmic rays, how to implement near planets?

I read this question about feasibility of capturing hydrogen from the Solar wind a while ago. Hydrogen in solar wind was exploited in that discussion. Here, does cosmic ray often close in towards a ...
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2answers
75 views

Reef World 4 - Flora

Piggybacking on the previous “Reef World” questions. Let’s talk Flora and how it adds to life and the environment on Reef World. The entire planet is mostly covered in shallow ocean, but not ...
7
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6answers
430 views

Pike and Shot with trains?

I would like to preface this by saying that English is not my first language so I ask that you excuse any grammatical errors. So could a setting conceivably have pike and shot military tactics, but ...
3
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1answer
90 views

What type of infrastructure would be needed for an upside down city in a cave with a giant freshwater lake need if the the trade is a school/college?

Details In my story I have the thief school/college which built a city, or if you asked others was built because of the city (It was so long ago nobody knows.), underneath the capital of Mafalia by ...

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