Questions tagged [science-based]

For questions that require answers based on hard science, not magic or pseudo-science, but do not require scientific citations. Contrast with the hard-science and reality-check tags. Do not use this tag as the only tag on a question because it describes how the question should be answered, not the topic.

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What are good structural and energy-storage molecules that don't release gas when synthesized?

Nicar is a carbon world (formed from a protoplanetary disk with more carbon than oxygen, so water is geologically unstable and the chemical environment is strongly reducing) with ammonia oceans and ...
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3answers
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What are the chances of finding uranium-238 ores on other planets?

I was thinking about aliens and space colonization and what the probability is of uranium ores being found on other planets. Would they be common? rare? medium? who knows? the cosmic abundance of ...
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What would a eusocial species of lepidopterans look like?

I am writing a science-fiction story that takes place some million years in a future Earth. There is a species of lepidopterans that evolved to become eusocial. They are my gnomes. My species is a ...
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How many generations to breed a goat that would be strong enough to carry the weight of a man [closed]

How many generations or years would it take to create a ridable goat? What about sheep or rams, etc?
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1answer
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What would be a possible reason for a organism or plant being red-colored [duplicate]

The title says it all but I was wondering if there could be some sort of hypothetical plant that could harvest solar light via the red pigment.
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3answers
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On a world that is ravaged by Carrington Events, is there any way for the inhabitants to develop electricity?

Inspired by the question On an Earth regularly ravaged by solar storms as strong as as the Carrington Event, how would technology advance? On a world that is ravaged by monthly Carrington Events, it ...
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1answer
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How could a human with infinite strength crash a planet into earth

A bad guy was kicked off earth and lands on another planet or dwarf planet. He has magical powers that let him have as much physical power as he needs to accomplish his goals. He is also extremely ...
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2answers
177 views

What could cause a planet to have hemispheres that rotate in opposite directions?

I have a planet in mind that is highly hostile to basically everything around its equator but is more or less survivable everywhere else(hopefully ^v^). One of the ideas I have in mind for making the ...
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4answers
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How do animals evolve to have arms

My question is how/why does my creature evolve into having arms when it has none? Context: I am currently creating a evolutionary tree for the first animals of my planet. My planet is the size of ...
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1answer
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Giant realistic Prototaxites like fungi in a hot climate

My planet is very similar to earth around 359 to 299 million years ago. years ago. It’s mostly covered in deserts, jungles, swamps, temperate forests, and their variants. (The Carboniferous period The ...
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2answers
102 views

Maximizing crop yields

Ladies and gentleman, today we were summoned by the Agro-nerd council with one unique mission: we must take a single acre of land and feed the largest amount of people possible. But this isn't your ...
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1answer
120 views

Strong flying creatures

I'm in the process of creating flying animals big enough to carry a human being on their back, the problem is that if it's too big, the wingspan also has to be and muscle will be needed for the wings ...
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4answers
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Why would Dune sand worms, or their like, be attracted to even the smallest movement?

The sand worms in Dune are gigantic creatures. Confirmed sizes reach up to 450 meters long. And in the wiki it says "Some people believe that worms from 700 to even 1000 meters existed in the ...
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1answer
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(TW: Strangling) Would this character actually have any difficulty breathing?

((Alright, so! I don't even know if this is the right place to ask, but I hope to hear your thoughts. Sorry for the morbid topic and thanks in advance!)) In a comic I'll eventually draw, there's this ...
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3answers
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What's the minimum height of a mountain resolvable to the human eye from 800 miles on a flat Earth?

The Taniquetil / Oiolossë (Mount Everwhite) on the eastern shore of Aman is the tallest mountain on Arda. Far higher than the other Pelóri, it could be seen from the mountain Meneltarma on Númenor ...
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3answers
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Ice Dragon Breath

I was thinking about creating an ice dragon for my world, but I didn't want the dragon to be magical or technological but biologically correct, so I went looking for cryogenic substances and found ...
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2answers
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What is the feasibility of a polar civilization using auroras for power?

Okay, so I’m working on making a setting for a TTRPG and am working on what to put on the North Pole area. I’m thinking a big ol’ Antartica-esc continent with a civilization of Nordic-like people that ...
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3answers
499 views

Will a Universal Ocean Prolong the Age of Stars for Eternity?

One moment, there are as much as two trillion different universes, all of which have their own collections of galaxies. The next, 4,543,000 universes still have their galaxy collections. What ...
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0answers
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Strength of Little Mermaids

This is a successor of Little Mermaids: Will They Survive? and concerns the strength a little mermaid has to throw around. You see, a little mermaid has enhanced strength; the strength of a typical ...
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1answer
82 views

Realistic sensor array capabilities?

This is a follow-up to an as of yet unanswered question: What would the local effects/affects be of a ring spinning near luminal velocity? If you can, please take a look at this question as well! ...
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1answer
176 views

How high would a mountain have to be to have no snow on its summit?

On Earth (or another planet with an identical atmosphere), how high above sea level would a mountain have to rise so that its summit would no longer have any snow on it, not even temporary? The ...
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3answers
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How heavy would a human need to be to walk through a brick wall?

I have a person with a superpower to interact with the world as though they were extremely heavy. The power is smart and selective, which allows him to walk normally without crushing the ground, or ...
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1answer
106 views

Can there be an ocean in a CO2 atmosphere?

See my first question here and other things about atmosphere: What would be the color of a CO2 atmosphere? Hi so I have a planet with a CO2 atmosphere so can there be any ocean on this planet?
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6answers
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Can a NASER be used as a weapon?

Before I go to my question, let me refresh the basic principles of operation of a LASER (Light Amplification by Stimulated Emission of Radiation): an active medium is brought in an excited state and, ...
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7answers
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Could Mars be punched onto a collision course with Earth?

In a fantasy world I am making someone insanely powerful is knocked into space and lands on Mars. He can't just jump back because there are people who can push him off course and he would be going ...
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5answers
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Maintaining an advantage in a world of infinite acceleration capabilites

Technical Suppose that someone showed up very few years ago and started selling out spaceships ships are capable of arbitrarily high acceleration, the drive is integral to the hull and moves the whole ...
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1answer
80 views

How to write character who was the ability to manipulate diamagnetism?

I am trying to adapt a character who has Diamagnetic Manipulation abilities (https://powerlisting.fandom.com/wiki/Diamagnetism_Manipulation) into my own universe. Although I know superpowers do not ...
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2answers
137 views

Obtaining laser

I did some research on electric dragons and found a post asking about it, in it there was a answer that mentioned an apparently chemical laser used to ionize the air and allow the electric discharge ...
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5answers
3k views

Feasibility of Giant Butterflies as Predators

I have asked multiple questions about giant caterpillars, now it's time to account for their evolutions. Sure, giant flowers could and probably would exist in Alendyias; an Engorger dying in a flowery ...
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7answers
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Maintaining an advantage in a world of reactionless drives [closed]

Suppose, because I can't be bothered explaining the exact setting, that someone showed up tomorrow and started handing out spaceships with reactionless drives to anyone who asked for them. These ships ...
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9answers
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How would people detect a 1 year time jump between star systems?

Scenario: A wormhole is created between Sol (earth) and a planet in Alpha Centauri. Travel through the wormhole appears instantaneous from the travelers perspective. However, the wormhole has a one ...
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4answers
707 views

Realistic combat AI [closed]

The idea of combat robots is simple, they are robotic soldiers that don't eat, don't sleep and don't rest, but they never touch the issue of the AI they employ. The AI of a combat robot must meet the ...
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3answers
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Dam in the Mediterranean

I am looking to write a story where part of the Atlantropa project goes through. Now I know about all the issues with it: the soil is covered in salt and unusable, it raises sea level in other places, ...
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1answer
121 views

What kind of weathering on which kind of stones would produce fantasy style rock formations?

What kind of natural or artificial weathering would have to go on to produce fantasy-like formations, what kind of geography and geology would have to be going on? I'm talking about formations like a ...
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1answer
67 views

What are the buoyancy capabilities of super-heated Helium?

In some questions here (and in other sites), when the subject of a floating spaceship is addressed, I always see someone suggesting super-heated Helium of Hydrogen. However, I can't find anywhere ...
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3answers
121 views

How big would a artificial island have to be to bring about massive economic and ecologic repercussions for the rest of the globe

If someone were to create an artificial island by digging into the mantle and using nuclear bombs to cause islands to form, then how big could an island have to be for the world to be in danger or for ...
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2answers
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Where does mana come from? [closed]

I’m slowly developing a magic system loosely based on how magic is usually seen to appear in most fantasies, but with consistent rules. So far I’ve decided that mana exists in the world alongside ...
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2answers
99 views

What is the maximum percentage of sky that could be covered by a super-Jovian world?

Puffy Jupiters can be huge but the Kepler data suggests that traditional super-Jovian worlds nearer the goldilocks zone, or farther from their parent star, only reach about 10% larger in diameter than ...
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1answer
309 views

Would there be ocean currents in oceans of sulfuric acid?

Would there be ocean currents in sulfuric acid oceans? For my world the oceans are made of sulfuric acid because of the high amount of sulfur in the atmosphere, and I was wondering whether there would ...
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0answers
83 views
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Weather for a dense-atmosphere water world

In this answer, I describe a low-density water world with a surface gravity of 1g and a surface atmospheric pressure of 20 ATM. The air temperature at the 1 ATM altitude (naively, assuming a ...
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5answers
104 views

What tests might someone do to assess possible brain damage from time travel? [closed]

I have a character who travels in time, but after making major jumps (like 100 years forward), she begins experiencing side effects—first nose bleeds, but the symptoms begin to increase to things like ...
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16answers
5k views

What kind of substance that existed in the Middle Ages could, when ignited, potentially destroy everything within several miles?

I am a DM for a homebrew D&D 5e game. In terms of technology, the time period loosely takes place somewhere between 1100 and 1400 CE (so High Middle Ages to Late Middle Ages). The villain of my ...
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3answers
81 views

Hours of sunlight calculation

TL;DR - How can I calculate the hours of sunlight a spot on a planet gets when I know its location, time of year, and altitude? How would having objects in the way affect these values? I am currently ...
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1answer
93 views

Explaining Deathwatt

The Atomic Deathworm. An interesting concept, one I adapted. Living in sand is not likely for a worm, unless, of course, that sand is near or in water-plenty of worms live in wet sand. However, ...
2
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1answer
229 views

Effects of a creature longer than Jupiter getting too close to Earth

So basic introduction: my world has things which naturally should never exist due to seemingly violating certain laws we deem as natural, for this, let's just call them "anomalies". Among ...
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2answers
71 views

How Feasible are Weaponized Wings for Flayt?

Flayt, like Viji, are a race of anthropomorphic creatures, most resembling birds and around the size of a human. Back when I first imagined them, Flayt were essentially giant birds, with spotless ...
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13answers
4k views

Can a tunnel be hidden from acoustic scanners?

There is an underground vault containing something very valuable. To prevent robbers from tunnelling to it, the security personnel regularly scans the ground with sound and geophysic sensors. Some ...
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6answers
3k views

Would aliens use the same fuel as us, if not what would they use?

Would aliens on a entirely different planet to earth still use the same rocket fuel as us? If not what are the alternatives? The planet has an escape velocity of 17 km/s, an atmosphere roughly ...
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2answers
80 views

Biochemistry of a sulfuric acid world?

Much like the Cannonball world with iron carbonyl seas, Stephen Gillett, in the book World-Building proposes a world with sulfuric acid seas and oxygen atmosphere, with life based on silicone (...
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2answers
153 views

How could octopus-like creature evolve to live on land?

How could an octopus like creature evolve to live/survive on land? Would it want to live on land? For my world I am having 2 intelligent species on the planet. One lives on land, one lives both in and ...

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