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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Anatomically Correct Grootslang

This is a submission for the Anatomically Correct Series Residing in South Africa, the Grootslang is a creature of African folklore being depicted commonly as: Being 37 to 40 ft long having a cobra ...
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2answers
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Sensors for a clockwork/fluidic robot?

So, mechanical computers are a thing, as are pneumatic and hydraulic actuators. Combining those ideas, it's not that hard to design simple purely-pneumatic/hydraulic robots--provide them with a ...
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Anatomically Correct Kelpie

This is a submission for the Anatomically Correct Series Residing in Scotland, the Kelpie is a creature of Celtic folklore being depicted as: looking like a black horse residing in lakes and pools ...
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8answers
806 views

How might my futuristic interstellar civilisation have missed a Dyson swarm on their doorstep?

It's the future. The setting is about as "hard-ish sci-fi" as it is possible to be, with the one big exception of a viable FTL engine. Humans have began spreading out into the galaxy, colonising ...
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Can an immune person be the key to finding a cure to a disease?

At the risk of almost repeating a question I asked some time ago... Scenario: A character has been cured of a deadly disease, but all records of the cure have been destroyed (files, actual meds, etc)....
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4answers
152 views

How can Degenerate Matter be stored?

In multiple sci-fi, Degenerate Matter is often used for a myriad of applications. Degenerate Matter consists of Neutronium, Quarkonium and other matter coming from dense stars. They have high strength,...
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3answers
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Would it be possible with current rocketry to go from Earth to Mercury and then come back?

Leaving aside the matter of how well would humans fare on the surface of Mercury (we only have to factor in the weight of their life support: air, water, food and spacesuits), and assuming materials ...
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3answers
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What would a darkness effect capable of blocking all electromagnetic radiation probably do?

(As of 2020, February, the 19th, 12:23, I have decided to use a different method than the one originally proposed. The method itself answers the question) Imagine a spell an effect of utterdarkness. ...
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7answers
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What would be the best way to capture a Giant?

After years of meticulous planning and crushing any and all opposition I've set my sights on conquering other races and nations. One group that I believe would be a valuable asset for my expanding ...
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1answer
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Big Brains Needed

I need the biggest brain I can realistically get, how big is it and why? I've done a bit of research. I know we (humans) have big brains. We've even got big brains compared to our weight (...
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121 views

How could the most destructive spell work in my Barrier Magic?

The core concept is a bastardized fusion of utility fogs, and the magical barriers of witches from the anime Puella Magi Madoka Magica. Utility fogs are swarms of 100 micrometer robots, foglets, that ...
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3answers
289 views

Why would a spaceship rely on hydroponics instead of algae for food?

Currently, NASA is investigating the use of hydroponics, aeroponics, and other low soil techniques to grow regular plants for consumption and oxygen generation/CO2 removal on long voyages in space. ...
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Are external lights on spaceships even necessary?

Many fictional spaceships of all kinds are known to have external lights. Do they even need them? Outer space is lit by the billions of stars and galaxies, so why are there external lights on ...
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How long can 400 people survive in an underground facility if they had to seal off their heat vents?

Assume the surface of the planet is experiencing ice age conditions and the facility was designed to keep the occupants alive for 6 months. An emergency forces the permanent closure of all Heating, ...
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Little known, relatively unlikely, but scientifically plausible, apocalyptic (or near apocalyptic) events [closed]

We know the common tropes for an apocalyptic event: meteor/asteroid hits earth; crazy infectious virus/bacteria; AI takes over; we nuke ourselves; climate change; hostile aliens. But what are some ...
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Humans surviving on surface without Sun

Is it possible for humans to survive on the surface of the Earth, assuming the Sun was, for some reason, not emitting any light/heat/other radiation? Would whether the Sun was actually present affect ...
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What foods will lycanthropes and vampirism-afflicted individuals need to avoid?

In an alternate version of our world, lycanthropes and vampires were introduced about 300 years ago and are coexisting with us. Unfortunately, they had to adapt to our cuisine and avoid certain ...
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The Red-Headed Whale. Why Would the Head be Red?

In the waters of Iceland, the natives have their own word for a particular brand of cetaceans--"Illhveli", literally "evil whales". And the bloodthirstiest of them all is Raudkembingur, Icelandic for ...
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4answers
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Could you fly a Boeing 747 on Venus?

I have been making a future colonization scenario where people have vast colonies on Mars and cloud top bases on Venus. These things are unbelievably large. I've already thought of a way to travel ...
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16answers
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What happens when a moving vehicle loses all its kinetic energy at once

In the system of magic that I am using I try to follow the laws of physics as much as possible. The idea being that whatever magic can do, a scientist and machine can eventually do. One of the things ...
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7answers
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Aquatic aliens and the effects of acceleration in space-flight

A sentient species of water-dwelling aliens achieve space-flight. Their living quarters contain water [no free gases]. They have evolved over millions of years to regulate their buoyancy at will. ...
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2answers
65 views

What average global temperature would optimize Earth for human habitability?

The year is 2100. While climate change has wrought serious damage to the biosphere, humanity has at last managed to become carbon neutral, and has even developed technology that can be used to reduce ...
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11answers
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How could immortal children age faster than immortal adults?

In plenty of stories you have beings who age incredibly slowly and are technically immortal. I have a handful of similar such beings who have through some means or other attained the benefits of ...
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0answers
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Bleeding as the bodily equivalent of a positive pregnancy test, Plausible?

One of many things that differs the pregnancy of my Keplerians and that of humans is that in Keplerians, there is a symptom that is equivalent to a positive pregnancy test. To explain this, first, I ...
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3answers
114 views

Navigating a sea of sulfur hexafluoride

Sulfur hexafluoride is pretty awesome. It is a gas six times denser than regular air, and thus you can actually make tinfoil "boats" float on it. It also makes your voice deep when you breathe it in. ...
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12answers
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Would we notice ridiculously healthy birds?

Consider the following situation: Over the last 2 to 3 years, all the world's birds and bats outside of those in human captivity or domestication have stopped getting sick; sick - even terminally sick ...
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2answers
63 views

Developed, highly advanced metropolis short on exotic foods

I have this setting, about an advanced city state in the middle of a sparsely inhabited wasteland/grassland type area. This state has the 90's level tech on consumer level, and a wide range from 90's ...
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1answer
67 views

How fast would a gas giant, or very close moon, need to orbit to maintain distance?

I have noticed that there is a common theme in science fiction art to depict one or more very large planetary bodies in very close proximity to the surface of the other world being depicted. (you can ...
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4answers
203 views

How to hide a spaceship visiting Earth?

So, me and the boys have decided to take a trip down to Earth for reasons that matter not be it science, leisure or fleeing persecution. It is no concern how we blend in but our spacecraft poses an ...
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2answers
93 views

Feasibility of a tree with a circulatory system

I recently look at a question on this site that questioned if a “world tree” is feasible, Would a 'World Tree' be feasible in real life?. If i remember correctly, it stated that one way to ...
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1answer
151 views

Could there be something like the Higgs field which gives particles their energy in a similar way to how the Higgs boson gives particles their mass?

First of all, in no way do I have advanced knowledge of particle physics, quantum mechanics, or any other necessary scientific concept for a full understanding of this question. Secondly, this is ...
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2answers
272 views

How to Make This Alternate Earth as Black as The Dark Knight

"The Dark Knight" is a nickname given by astronomers to the exoplanet TrES-2b, a gas giant with an albedo of one percent, blacker than paint, blacker than coal—in fact, blacker than anything on Earth! ...
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1answer
190 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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14answers
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Effectiveness of a glowing hot tungsten sword against medieval era knights?

A blade made out of tungsten alloy that’s also electrically heated to 3000C. The shape and sharpness is similar to a katana. The user carries a battery pack that provides enough energy for the sword ...
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3answers
380 views

Happiness is Mandatory

Happiness is mandatory. Unhappiness is treason. Treason is punishable by summary execution. Are you happy, citizen? - Friend computer. Welcome to Beta Complex, the little brother of Alpha Complex. We ...
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3answers
154 views

What environmental factors would cause bipedalism underwater?

While reading this question about how non-primate mammals could develop a bipedal stance, I became curious about the broader reasons why animals could evolve to walk on two legs. I found some ...
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1answer
97 views

How much DNA half-siblings do share? [closed]

Title is pretty self explanatory, but how much DNA would half-siblings share if they had the same mother ? I'm asking for a very specific reason. I'm writing a book in which some boxes can only be ...
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1answer
84 views

What adaptations should a utility fog, that's meant to be an air-fuel explosive, have?

I found a way to ensure that even if either the Japanese Self-Defense Force or the U.S Army invades my fantasy world, its inhabitants would still have a fighting chance. Utiltiy Fog Hall thought ...
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4answers
725 views

How do I calculate the hours of daylight on an arbitrary planet for a given day at a given latitude?

I want to be able to graph the change in daylight hours across the year for a given latitude, to get an idea of what kind of cycle in available daylight people at that latitude would live through and ...
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4answers
111 views

Perfect centrifuge crew quarters for a interstellar spaceship?

I want to design a realistic interstellar spaceship that uses centrifugal force for only the crew quarters. But while looking up for designs I found the most common ones are the torus or ring design. ...
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2answers
460 views

Does crossing a wormhole happen instantaneously, or with the course of time?

I have seen many science fiction movies that depict traveling in space through wormholes. The appearance though, and the time it takes to cross a wormhole, tends to vary: • On one hand, we have the ...
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3answers
73 views

How would the weather and organisms and flora be affected on an Earth-like planet with floating continents?

I am currently writing a script for my graphic novel. My novel is in the fantasy genre and I use energy-based hard magic (that is energy-based magic that has its sort of "science" and rules). So I don'...
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6answers
596 views

Why would humans be the dominant species?

Humans, in most fantasy stories including in my own, are the dominant species. Why is that? Firstly, I guess I should give every race in my story strengths and weaknesses. Humans (same as us) have ...
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1answer
44 views

How might a sea wyvern adapt its flame breath?

Sea Wyverns (name not final) nest on small, rocky islands scattered throughout the sea and primarily catch fish going somewhat below the water. Basically, wyverns ingest a piezoelectric crystal which ...
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0answers
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How would a Jupiter sized planet impact humanity? [closed]

So while worldbuilding I was pondering the effects of such a large planet on humans and their development alongside magic, technology, society, etc. So the planet is like Earth in water/land ratio, ...
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4answers
70 views

Malicious Infection Transmitted Across Outer Space

If an extraterrestrial race were to send a signal to earth containing a virus (technological or psychological), how could that signal then infect our technology and then be received by humans?
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1answer
100 views

I have a way of giving something negative mass. Did I just end the world,or usher in a golden age of space travel?

So, somehow, I have discovered a process that makes an objects mass negative. Not its weight, its mass (although, I guess that the weight would also become negative). The thing is, before I try it, I ...
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Creating a plausible Griffin [duplicate]

griffins are a fantasy staple I want to put my own realistic spin on this classic.Some characteristics of griffins include: are Tetrapods are slightly smaller than a lion can fly or at least glide ...
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1answer
54 views

Immunity from all infectious diseases?

The human body can create a quintillion variants of antibodies.   Resistance to infectious diseases is mainly carried out by the methods: White blood cells (white blood cells) and phagocytes. White ...
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1answer
65 views

How might someone live for thousands of years?

A long time ago during the last ice age an early hunter gather human encounter an unknown entity (likely a alien) who granted him the power of immortality with him living at least up into the middle ...

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