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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.

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46 views

How do I create a “magic particle” to make magic work with physics?

I'm trying to make a fantasy-esque magic system in which everything works pretty much the same as real life, except there's a sort of "magic particle" that makes magic possible, but with physics. In ...
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1answer
42 views

What Kind of Pigment Would Allow Basic Photosynthesis and Give the Skin a Blue Color

Let's say there is a planet orbiting a star. The planet is much like our own, with a similar atmosphere. However, the star this planet orbits differ from out star. It differs in such a way that it ...
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1answer
59 views

How much sunlight can I get into my O'Neill cylinder and how much light needs to be artificial?

The cylinder is 32 km long in total, 8 km in diameter, with 3km long endcaps, resulting in a habital area with a length of 26 km (= and an area of cirka 754 km2). The main body of the cylinder is ...
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0answers
130 views

How to survive in the Besieged Hong Kong Polytechnic University? [on hold]

Given the current situation in Hong Kong Polytechnic University, with 50 survivors (protesters) being besieged by more than 500 polices located at every intersection of streets nearby, and even drains/...
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3answers
154 views

Sword that is limp when in sheath, and hard when drawn?

I want to create a sword that when sheathed remains limp/flexible or soft but upon being unsheathed it become hard like common steel. So, something like the sword going soft when not exposed to ...
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3answers
95 views

Sun with low emissivity?

I'm creating a D&D campaign which takes place on a Mercury-sized planet, orbiting a Proxima-Centauri style red dwarf. It is tidally locked. I would like it to make physical sense as much as ...
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4answers
107 views

What's the deciding factor in what my Foresight can predict?

When you have foresight, it's guaranteed that confusion will be your epitaph (thumbs up to the one person who gets the joke). Basically, it only grants you advantage on actions, so you still can't ...
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2answers
132 views

An anatomically correct Jaculus?

Unless I am mistaken, a Jaculus, also called a javelin snake, is a creature found in Roman myth, described as a snake that hurls itself from trees and impales its prey. Its head is usually described ...
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4answers
109 views

Using Magnet Technology to Make a Rotating Space Station?

For an artificial gravity ring station, could you make a central hub, using similar magnet technology used to levitate magnet trains here on earth, to reduce the amount of mass rotating? My thoughts ...
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4answers
259 views

How Could a Scientist Intentionally Discover Penicillin

In our timeline Alexander Fleming accidentally discovered penicillin by accidentally leaving petri dishs out over a long period of time. If a person from an earlier time, e.g. ancient Rome, woke up ...
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2answers
691 views

Permanent Mist/Fog in an area [duplicate]

How could a region have a (semi-) permanent mist/fog? As close to natural as possible but possible enhancements are an option like: Technological : can both be chemical or mechanical but should ...
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3answers
129 views

What planet composition is need to have giant human that make earth human similar in comparison to ant size to them?

as the title say my question is: What planet composition is need to have giant human that make earth human similar in comparison to ant size to them? i know realistically and probably its imposible ...
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2answers
77 views

Could a dichromatic animal distinguish red and green but not blue?

If a dichromatic mammal had better night vision than a human, including tapetum lucidum, could they see large (red) and medium (green) light wavelengths but not small (blue)? Would something similar ...
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2answers
63 views

highly resistant metal or other material in late 1700s

What metal or material could be used to make super high-pressure canisters in the 1700s? It is for use as a fuel or propellant for a piston-driven engine to power vehicles, due to the fact that a gas ...
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2answers
74 views

Would sea levels drop in a Younger Dryas-type event?

I was imagining a sort of post-apocalyptic/collapse setting, where a few centuries of climate catastrophes brought on by climate change cause essentially your general end of the world as we know it ...
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2answers
78 views

Is it possible for psychological trauma to cause a lasting coma?

So, I was thinking about flavouring psychic damage and thought "If I'm anime > western civilization, then wouldn't it make sense for me to reflect it a bit more?" In an anime, I watched, there was ...
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1answer
121 views

The Great Oxidation Event…Artificially Imposed on a Tharn-Like Alternate Earth

From 2.4 to either 2.1 or two billion years ago, Earth underwent a surge in a waste product that we know as "oxygen". Before that, life thrived in an ocean rich with iron under an atmosphere loaded ...
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2answers
189 views

Would it be possible to survive on a world with only plants?

If you were air dropped onto another planet, where multi-cellular non-plant life did not evolve, could you survive on what was only around you? The planet in question is a clone of earth, in almost ...
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2answers
128 views

How would humans live in a world made primarily of glass?

Setup: Earth developed in an alternate universe with small oceans and little water. A little before animals first left the oceans and began to walk on land, when all of Earth's land was barren sand, ...
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3answers
127 views

Could a dichromatic animal see red?

So I'm not really sure whether I get it right or not, but apparently most mammals are dichromatic. Humans have three cones that detect light wavelengths, small for blue, medium for green, and large ...
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2answers
186 views

Is this Martian creature plausible?

I am thinking of writing a story about a Martian civilization. It might involve humans, but, I think it will be more interesting if there are creatures adapted to the Martian lifestyle as well. So, ...
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3answers
100 views

Wolves and Hyenas--Allies For Life

In recent years, we have found evidence in the Negev Desert of the Middle East of a striped hyena, a solitary carnivoran, tagging along with a pack of wolves. This sort of alliance is found nowhere ...
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1answer
100 views

How large can differences in gravity be without being overly dangerous to humans?

Let's imagine a planet that is 5000 km in diameter but has the mass of the Earth. I'd imagine standing on that planet might feel similar to standing on the Earth, because the gravity would be ...
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2answers
132 views

Could a carbon based lifeform use the mineral olivine in its structure? Why would it?

Have a creature from a dream. It's a carbon based humanoid creature partly made of the mineral olivine. Could there be any reason it might contain this mineral? Perhaps a show of health - the more ...
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2answers
110 views

How could this three-second foresight work?

"However, King Crimson has already seen through it. Your movements in the future. The trajectory of your movements in the future." "No matter who you may be, everyone goes through their ups and ...
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2answers
134 views

What would happen if I reversed the gravity of various manmade structures? [on hold]

Skyscrapers appear to be pretty securely attached to the ground. So do bridges, houses, and more. But are they really attached to the ground? What would happen to the structure if I was to reverse ...
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2answers
94 views

What is the size limit for a rocky planet in orbit of an O type star, within the habitable zone?

As asked in the title, what would be the upper limits to a rocky planet's size in orbit of an O type star, like 10 Lacerta's habitable zone? Density of the planet must be enough to stand on without ...
8
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1answer
140 views

What's in the outer system?

Background: It is sometime in the late 21st century. Several unmanned probes have recently been sent to land on and investigate Jupiter and Saturn's moons. Two sites in particular, Europa and Titan, ...
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3answers
158 views

How could an illusion effect covering all senses scare someone to death?

The "Weird" spell in my world is basically a magical version of the US government's goals with the "MK Ultra" project from the 1950s: it induces a shared hallucination in every creature within a 9.1m ...
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4answers
2k views

Modified stem cells as a resuscitation serum after death by cyanide poisoning?

In large doses, the body's ability to change cyanide into thiocyanate is overwhelmed. Large doses of cyanide prevent cells from using oxygen and eventually these cells die. The heart, respiratory ...
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9answers
6k views

Would a warhorse allow its rider to approach a Dragon at all?

Would a horse (trained or otherwise) not be wholly spooked by a Dragon merely flying overhead, even more so trying to enter combat with it or just trying to approach it under any circumstances? What ...
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1answer
88 views

Could life arise using iron pentacarbonyl as a solvant?

Iron planets are planets which lack a significant mantle. These planets are essentially lone planetary cores. Since water and iron are unstable together iron pentacarbonyl and other exotic metal-based ...
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2answers
117 views

How would oceans of supercritical CO2 on Venus-like exoplanets look like/behave?

Carbon dioxide turns supercritical above a pressure of 73 atm and 304.25 K (31.10 °C). The surface of Venus fullfils these conditions. The density of the air at the surface is 67 kg/m3, which is 6....
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4answers
311 views

Is there a way to trap a super-being like Dr Manhattan?

This linked video explains who and what Dr Manhattan is and what are his super-powers Dr. Manhattan’s Superpowers EXPLAINED. Dr Manhattan character is from Watchmen Here some quotes from Wikipedia ...
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2answers
113 views

What modification is needed so a creature can't fart, while it can still excrete?

As the title says, what modification is needed, so a creature cannot fart while still being able to excrete their waste? So creatures that can't excrete or doesn't have an anus like the Demodex is ...
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3answers
118 views

The Validity of Hunting with Fire

I'm planning an RPG character who's supposed to emulate dragons and to live up to the image he'd use as little equipment as possible. Without weapons, his main tool for hunting is fire attacks. I ...
6
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2answers
80 views

Is it possible to map the firing of neurons in the human brain so as to stimulate artificial memories to the amnesiac person?

As the title says, Is it possible to map the firing of neurons in the human brain so as to stimulate artificial memories to the amnesiac person? This is based on this similar question; Is it possible ...
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2answers
95 views

is there a scientific way to extract memory from a person brain into video?

Just as the title, is there a scientific or possible way to extract past memory from a person brain into some record such as video or visual player ? I know some theory say that it possible to ...
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3answers
2k views

What kind of planet could have giant sand worms?

I would like to have giant sand worms similar to the ones in the 'Dune' novel. What should the planet be like so that they are realistic? Giant sand worms are roughly 100m long and 5 meters in ...
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9answers
1k views

What would be the most practical raw fuel for a hydrogen economy?

In a near-future world we have stopped directly fueling private, public, and mass transit and we have migrated to a hydrogen economy as the standard energy carrier. Consider the following factors: ...
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3answers
115 views

Pinniped Creodonts

Here is all you need to know about the creodonts: They were a group of carnivorous mammals that, despite having carnassials, had no relation to Carnivora. They were a global force, occupying ...
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3answers
195 views

What Colour would a sulfuric acid lake be?

I was thinking of an interesting landmark to put on my conworld, and I went with the "large body of acid" trope. This lake would be about the size of Lake Superior, and near the equator. The ...
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3answers
352 views

What theoretically is the limit or max size and length for a serpent/worm before they get crushed by their own body?

Based on one of the comments in my previous question about What is the max size for underground creatures before the square-cube law takes a toll? Makes me want to know the limit size for a long ...
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2answers
112 views

what would it need to create indestructible bubble?

Not exactly indestructible, at least after flying to certain height it may pop out. I mean something like the bubble is as hard as stone or steel but still elastic and light to float like bubble, and ...
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10answers
6k views

A feasible and efficient method of fast global travel?

What would be an efficient method of global travel that can take you from, let's say, London to Hong Kong in about an hour? It would preferably be made quickly, but money is no object. I don't want ...
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6answers
160 views

100% renewable with current technology [closed]

How would a world look like that runs 100% on renewable energy with only current technology? We are living in a world where everyone came together to build that future that does not rely on fossil ...
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4answers
203 views

What effects would we see on Earth if the speed of light universally increased? [duplicate]

Traveling faster than light poses all sorts of physics problems, so most hard SF has had to handwave FTL. But if light were faster, then ships could be commensurately faster without violating ...
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4answers
656 views

Plausible ways for the alien species to be able to impregnate every and any species?

In many movies, alien species often have the ability to impregnate "every and any" species and have their mutant offspring. I have a story setup where some, not so conscientious, scientists decide to ...
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0answers
70 views

Is the Hammer Slammer’s Powergun feasible?

I have seen many people discuss in this community on how a plasma gun ought to be made. But only a few mention the Powergun from the Hammerverse. I ask if this design will work. Can the bullets be ...
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3answers
250 views

How could formamide lakes form on an exoplanet?

I've been recently looking into alternative biochemistries for life and the environments were these could be found. I already asked a question about how ammonia oceans might form a while back. Today I'...