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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.

4
votes
2answers
101 views

What is the earliest time a pulsejet could be built?

Let's assume that some wealthy characters somehow find the plans for a valveless pulsejet. How is not important. Maybe there was a time travel incident, or some Atlantean book was unearthed, or ...
-1
votes
1answer
61 views

How would react a medieval magic world to the arrival of an Interstellar colony? [on hold]

A space colony comes to a planet who is pretty similar to how fantasy's worlds tend to be represented. The space colony is 44% formed by "humans" only 8% of these still look like classic humans, the ...
3
votes
2answers
95 views

How long would it take for a centaur's broken leg to heal?

My fantasy world is medievalesque in technology. While healing magic exists, most centaurs do not have realistic access to it. Centaurs are your archetypal human torso, horse body. How long would it ...
7
votes
2answers
134 views

Could a medieval trebuchet and parachute work to deliver a soldier past a 20-30 foot wall?

This is a ludicrous question and isn't meant to be serious. I had an idea of catapulting people with parachutes and thought it would be funny. This was inspired by Elemtilas answering a previous ...
-2
votes
0answers
61 views

The Elementary Evil vs You /Wights/ Preventing Henry from gaining (more) power [on hold]

Several hundred years after Simon, the Sudoer, Anon and two gold dragons managed to seal him away, Heinrich, the First, formerly Henry, is back, this time with an M249, ready to give world domination ...
2
votes
3answers
148 views

How to detect gyroswords

So, in the land of futuristic feudalism, the board of sword duels has a dilemma. During a duel, one of the duelists added put gyroscopes in his sword. He claimed this was to improve his balance, which ...
-2
votes
1answer
111 views

What happens to hydrogen after burning [on hold]

With fusion on the rise we are going to have a lot of helium but what gases are limited in helium burning? Context: my science teacher did not know the answer and I got curious
3
votes
0answers
72 views

Monsters vs You /Dragons/ How to give them better resistance against firearms [duplicate]

Before we start, no, I'm not stupid, I know that I need this, agility and magic together to level the playing field, but one at a time. As I mentioned before, dragons can synthesize, break down, and ...
0
votes
0answers
59 views

Why would advance civilization type 2 or 3 still use manpower? [duplicate]

Why would an advance type II or III civilization would still use manpower? Why wouldn't they just use android and a.i as soldiers or workers in manual labors?
8
votes
1answer
122 views

Habitable world orbiting a gas giant orbiting a gas giant

How likely would a habitable world be that orbits a gas giant that itself is orbiting a larger gas giant? Assuming one exists, what are the likely conditions?
4
votes
2answers
89 views

Planetary tidal locking causing asymetrical water distribution

Imagine a planet of roughly the same size as Earth with the same amount of land, the same atmosphere and the same proportion of water (other planetary parameters may vary from Earth like) that has ...
0
votes
1answer
41 views

Most useful material properties for building tsunami-resistant submersible buildings? (Magical material engineering) [on hold]

My magic system transfers quantities of certain properties from one object to another. For instance, electrical conductivity from metal to rubber -- the metal becomes less conductive, and the rubber ...
2
votes
2answers
124 views

There is some material able to stand a plasma arc welding without damage?

There is something that can stand that much temperatures ? or that kind of Welding can evaporate or melt everything ? I read that nothing could stand more than 7000 ° C, but i want to be sure, also, ...
3
votes
4answers
676 views

Can a one-dimensional blade cut everything ? (chainsaw) (Sword)

I was thinking in a character who has a...kind of Steam powered Chainsaw, and a sword, what make them special is because the blades of the chainsaw are one-dimensional, same with the sword, they are ...
0
votes
2answers
77 views

Humans under different suns

What would humans look like if they were genetically suited for life under a giant orange star like Iota Draconis ? These would be people who were genetically indistinguishable from humans from earth, ...
7
votes
2answers
199 views

Ancient Egypt - Primitive Blockchain Technology

Premise The goal is to implement a bronze age version of blockchain in ancient Egypt to introduce a layer of security for the royal tombs. Tomb raiding was rampant, and at times even the legitimate ...
7
votes
0answers
86 views

Low-efficiency fusion propulsion?

I'm working on a fusion rocket concept for a hard science fiction setting. I'm envisioning laser catalyzed Proton-Boron reactors (low waste heat, aneutronic, 100% of their output being He4 Alpha ...
5
votes
3answers
81 views

Antimatter internal combustion engine

I have an idea for an extremely crackpot engine design for a future society I may incorporate into my story. What would happen is individual antihydrogen molecules injected into the center of carbon ...
2
votes
1answer
54 views

Monsters vs You /Dragons/ The reason for a truce? [on hold]

Worldbuilding for discovery writing and D&D is pretty much interchangeable. One of the tricks I employ when wanting something to happen roughly as I plan is to root it in gameplay mechanics. One ...
0
votes
1answer
123 views

How can I modify the prostate to produce alternative fluids?

Semen is liquid that spurts out of the penis during orgasm. It is produced by the walnut-sized prostate gland that sits just below the bladder, and by the seminal vesicles, two pinky-sized glands that ...
13
votes
6answers
1k views

Time travel from stationary position?

This is my first question on this site, which I recently found and can’t get enough of. In many time travel scenarios, the machine is static in space. My question is how to explain this. For ...
17
votes
9answers
3k views

Gravity magic - How does it work?

This question graduated from the Sandbox for Proposed Questions Gravity magic - How does it work? (What physical law can magic manipulate in order to affect gravity?) In my world everyone is ...
5
votes
4answers
100 views

The Elementary Evil vs You /Animatronics 2: Judgement Day/ We need a weakness!

So, Anon has had enough of the DM abusing his poor creations (the chromatic dragons). Wanting a better fate for them, he wraps the DM in unbreakable chains, forged in the heart of a neutron star, and ...
4
votes
3answers
235 views

Use bomb to detonate a white dwarf?

Suppose there is a Sirius A based alien civilization, but their planet is heavily defended, so direct attack is useless. Could we use some kind of weapon to detonate the Sirius B and cause a disaster ...
4
votes
2answers
128 views

What technology could cause a global black out?

In 2051 a Neo-Luddite movement known as "Amos"/"The Adherents of Amos" detonated some sort of weapon in LEO (low earth orbit) causing a global black out shutting down technology and to a extent modern ...
17
votes
5answers
323 views

Could a living creature produce graphene?

The thing about organics is that they can very precisely build themselves up, from a molecular level. They can take various, otherwise useless stuff like goethite and chitin and, through the power of ...
0
votes
1answer
87 views

A weapon that only works against the powerful [closed]

A class of Tyrants has been abusing the Oppressed for decades, centuries; taking everything they could from them. But the Oppressed cannot endure anymore, they have to fight back, before everything ...
17
votes
5answers
3k views

Gravity alteration as extermination tool viable?

An alien race was rubbed the wrong way by humans being humans and decided that humankind has to go. However, unlike many other science fiction stories, they do not intend to give the humans even a ...
6
votes
2answers
216 views

Is it possible for something like a werewolf to exist? [closed]

The most impressive thing to me about how werewolves are used in fiction, is their ability to transform humans into other werewolves with their bites. Aside from the full moon myth, could it be ...
8
votes
1answer
119 views

Planet with big axial tilt, but very close to its star

It is known that when a planet orbits very close around its star, the tidal effects will soon (on an astronomical scale) force the day and the year of the planet to have the same length, making the ...
0
votes
0answers
81 views

What would happen if all humans suddenly vanished? [closed]

If the cause is irrelevant, what would happen to an average city after the sudden disappearance of all human life? What would happen to the oil refineries, power plants, piping, etc? How long would it ...
19
votes
8answers
3k views

Aliens englobed the Solar System: will we notice?

Around 100 million years ago, the Solar System was instantaneously encased in a massless, magical sphere centered about the Sun. The boundary is about 10,000 AU (.158 ly) in radius and behaves ...
14
votes
16answers
3k views

How can The Temple of Elementary Evil reliably protect itself against kinetic bombardment? [closed]

This building is the centerpiece of my world and the reason for everything. Why would chromatic dragons and adventurers fight together? To take down this temple, of course. But why do I need them? I'...
0
votes
1answer
85 views

How would a receding sea level affect cities along Asian & Australian coastlines?

To make a long story short, the previous ice age resulted in not just massive glaciers and building snow from appearing, but larger landmass as well due to most of the water being frozen from the ...
8
votes
4answers
297 views

Could you engineer a baby for a same sex couple?

Kikazaru and Protogon have been fierce rivals in the designer baby industry/artificial wombs since time and memorial, but Kikazaru is looking to finally best its rival by introducing a new scheme: ...
9
votes
5answers
168 views

Using L1 Lagrange point to block energy from the sun?

Working on a near future fantasy world and am trying to work on a mechanism for magic being discovered/unlocked. My current thought, which is what I'm trying to get a feasibility check on, is that all ...
31
votes
12answers
10k views

In the late 1940’s to early 1950’s what technology was available that could melt a LOT of ice?

In my story I’ve devised lore where Greenland becomes a US territory, and they begin populating the region. It initially just served as the hub for numerous military bases and airbases, but eventually ...
1
vote
6answers
174 views

How can a terrorist cult genetically engineer human bombs?

A nihilistic organization founded by a preacher, Solf J. Kimblee, has reasoned that human beings have fallen short of God's true purpose. Since the betrayal by Adam and Eve, all people are born with ...
8
votes
3answers
239 views

Artificially make people incapable of singing at all (even poorly), but still capable of speaking?

Magic has recently become possible in my story, and singing is the mechanism by which humans use magic. A totalitarian regime wants citizens who can speak, but not sing in any way, even poorly. (That ...
8
votes
4answers
207 views

Propulsion Systems

In my world, 500 years in the future, my population fits anti-gravity engines to salvaged boats as a form of transport. These transports fly close to the Earth's surface and are powered by a highly ...
1
vote
2answers
51 views

Types of life on a planet in a sun-synchronous orbit?

Basically, a sun-synchronous orbit is where one side of an object is always facing a star as it revolves around it (much like our Moon is, which is where the phrase 'dark side of the moon' originates')...
5
votes
2answers
47 views

What would Define Ecosystems in a “Frozen Moon with Ocean” World

What factors would influence ecosystem development in an ocean on an ice world? It is thought that several moons in our solar system (e.g. Europa) may have significant oceans under their icy crusts. ...
13
votes
6answers
372 views

Could just a brilliant idea advance science by decades, or even centuries?

Inspired by this story, I started thinking. Let's say we have a person, from the modern day, who miraculously gets a superpower: He can rewind time, but retain his own memories. He can rewind all the ...
4
votes
3answers
219 views

How could my hard telekinesis work?

So, in my setting, telekinesis is divided into two sub-fields: Soft telekinesis allows for precise manipulation of objects but doesn't pack a punch. Newton's third law is negligible for this type. ...
3
votes
1answer
96 views

Weather and climate during the next Ice Age

I have a short story series, it is set thousands of years in the future during the next ice age. Humanity and their governments reside along the equator and in parts of the Southern Hemisphere. ...
6
votes
1answer
150 views

How would you build a realistic Le Palm D'Orbit?

I was watching futurama yesterday and the Le Palm D'Orbit struck me as a fun concept. How would you go about building a orbital restaurant like the Le Palm? What kinda shape would allow the space ...
-1
votes
1answer
128 views

What would the implications be if all terrestrial lead was gold? [closed]

At some point before life crawled out of the ocean, some alien alchemist managed to turn all of the lead on the earth into gold. Galena becomes some sort of Electrum, and any existing Anglesite and ...
0
votes
4answers
163 views

What are some of the reasons that a dwarf planet might be reclassified as a planet?

I am thinking of a scenario in which a dwarf planet, previously declared as a planet, is reclassified as a planet. What could possibly cause this? Could any possible mineral findings cause this, ...
8
votes
1answer
121 views

Determining Planet rotation period that would allow for global Wind Cell

I'm trying to figure out how quickly a planet could rotate while also having a single air flow cell, such as Hadley cells, that would circle from hot pole to cold pole, etc. as in the case of Tidally ...
36
votes
11answers
10k views

Can a space-faring robot still function over a billion years?

This short story, which I've already written, is set in the FAR, FAR FUTURE, where a robotic space probe is exploring as much of the known universe as it can, despite its AI not knowing if its ...