Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [physics]

For questions regarding the physics relevant to fictitious worlds. General physics may be off-topic.

3
votes
2answers
87 views

How strong is a centaur's upper half?

I know I won't be able to get a solid answer and I could always just change this detail depending on the setting etc., but in a realistic scenario, I have no idea if they'd be significantly stronger ...
4
votes
4answers
218 views

Creating a Matryoshka Shell world: temperature regulation

In a galaxy far far away, during a fit of inspiration for a super massive marvel of technology, the Imperator dedicates an astounding 10% of energy and materials from his civilization's dyson sphere ...
3
votes
0answers
89 views

How much longer would it take to reach technological parity without access to energy dense resources like fossil fuels to bootstrap development? [closed]

If the only difference in our hypothetical world is where fossil fuels like coal and crude oil are nonexistent, the advent of an analogous Renaissance Era, subsequent Age of Enlightenment, and ...
3
votes
3answers
189 views

Landing Pad Using Lenz's Law

In my universe technology is advanced enough to have non-jet and non-rocket booster technology. For a disc shaped UFO all of the technology is crammed in the ship and there was no more room left for ...
1
vote
2answers
106 views

Atmosphere density and visibility range [duplicate]

How far can you see through an atmosphere like the one we have on Earth? The protagonist inhabits a huge world, like the inside of a sphere, a Dyson-sphere, with an approximate circumference defined ...
4
votes
4answers
281 views

What requires more destructive energy? Destroying a planet or splitting a planet in half

I just wanna ask which option requires more destructive energy? Option 1 : destroying a planet like earth to rubble (tiny pieces of rocks) Or Option 2: splitting a planet like earth in halves (2 ...
6
votes
2answers
170 views

How would lower gravity influence Bronze Age projectile weaponry?

How would lower gravity, let’s say around ½ of Earth’s, change the efficacy of different Bronze Age projectile weapons? How would the effective range, accuracy, and penetrating power of bows, javelins,...
31
votes
12answers
8k views

Why isn't my superhuman always hungry?

I'm writing a speculative fiction story that includes superhumans. The focus is on individual characters and their daily lives, and I'm trying to maintain some consistency by not throwing all the laws ...
8
votes
2answers
1k views

Climbing up on running water

I remember playing this game back in 2010-2011, and In minecraft if you found a waterfall you could actually swim it up vertically, it was difficult but possible. Does this apply to real life to, ...
9
votes
3answers
198 views

Safely exiting zero-tau capsule

Setting is 20 minutes into future - everything is as we know it, or as we can reasonably predict, except the zero-tau capsules. Capsule is a thin mesh of Unobtanium connected to a portable Handwavium ...
0
votes
3answers
212 views

Energy beam pierces 200m thick steel wall. What happens next?

With a powered-by-phlebotinum (ergo very handy, very powerful) rifle, I am able to shoot high-energy beams which, in turn, can pulverize anything in their path in a considerable radius. The beams can ...
7
votes
2answers
134 views

Could the TRAPPIST-1 planets have moons?

The TRAPPIST-1 planets are all very close to each other and thus are subjected to strong gravitational forces amongst each other and to the red dwarf they're orbiting. Would it be possible for them to ...
5
votes
1answer
113 views

How does the n-body-problem affect a star system around a red dwarf?

So my story is set in the TRAPPIST-1-system and a rogue planet enters the system. When it's still far off, a scientist discovers that one of the numbers is slightly off. (She has some tables that ...
4
votes
2answers
116 views

Would bio-kinetic metabolism allow the user to also absorb kinetic energy too?

I am trying to base a superpower around bio-kinetic metabolism where the user can not only generate a massive amount of kinetic energy but can also absorb a massive amount of kinetic energy. Is there ...
60
votes
10answers
15k views

If reality were frame-rate based, how could we detect it?

Inspired by this question regarding reality as simulation and this question about a continuous time line, it made me wonder: if our time were indeed like a high frame-rate simulation, how could we ...
5
votes
2answers
266 views

How much mass does an object in low earth orbit need to create visible gravitational effects on the surface?

The question stems from watching a scene from ID2 and seeing the massive alien mothership landing/crashing on the North Atlantic. What mass would a starship, or any other artificial object ...
11
votes
2answers
720 views

“Magic” diamonds for fuel?

The subterranean nation of Glot has developed the ability to “thermally link” two equally sized diamonds, such that they are always the same temperature, regardless of spatial separation. We can ...
2
votes
3answers
72 views

Weather and climate of tidally locked, inhabited moon with oceans

This follows another question that brought me some curiousity about the general state of an earth-like moon tidally locked to a gas giant planet. There's been questions about a world tidally locked ...
5
votes
3answers
703 views

Would a water-bearing, Earth-sized moon orbiting a gas giant have tides?

I ran across this article today about how moons might have moons. In Daniel Keys Moran's universe, an Earth-sized planet named November orbits a gas giant named Prometheus. November is inhabited, ...
4
votes
2answers
80 views

What are some plausible formation explanations of a non-hot “Fluffy” Gas Giant planet?

So, in my research and preparation for the question I asked immediately before this one, I was introduced to the concept of "fluffy" gas giants, gas giants with significantly lower density than would ...
9
votes
5answers
160 views

Mechanism for high geographical change but not killing everything

Premise: Earth has a magical cataclysm that pulls up new mountains, pushes down parts of landmasses, and generally reshapes Europe enough to make it unrecognizable (to the average person looking at a ...
5
votes
7answers
2k views

Travelling the multiverse by accident? [closed]

As you've probably guessed, I have no idea how multiverses and parallel universes, or space-time travel, etc work. I don't know how Physics or Mathematics explains alternate universes. But, they are ...
12
votes
2answers
916 views

Would a javelin fly further in a vacuum?

My current WIP involves an athletics competition on a non-terraformed moon, namely the Earth's moon. And while it would be a bit difficult to play certain sports without a breathable atmosphere, the ...
-2
votes
2answers
109 views

A balloon that can float to space [closed]

I’ve heard there are materials that can withstand the image sort of the earth’s atmosphere, such as carbon nanotubes and Kevlar. Supposedly, a perfectly constructed bridge of such material could be ...
-2
votes
1answer
73 views

Communication between people [closed]

Suppose there is a man standing on a platform and a man inside a train. They started talking with each other. We know speed of sound-340m/s, so when the train starts moving will the speed of reception ...
5
votes
3answers
146 views

Determining the energy efficiency of a Light Wand

So, I'm working out some of the types of wands people can purchase in my flintlock fantasy setting, and I'm having an issue with one of them. Before I get to that, let me explain how Magic in my ...
5
votes
6answers
717 views

Geoengineering for dummies

My human civilization is facing (much like us) the threat of anthropogenic climate change. For whatever reasons, they are unwilling to take action by reducing the use of fossil fuels and refuse to use ...
20
votes
1answer
1k views

Could a planet's Karman line hypothetically occur under a liquid surface?

The Karman Line is one of the most commonly-used definitions of the "edge of space". As an airplane flies higher in the atmosphere, the air gets thinner and thus the lift decreases. This can be ...
13
votes
12answers
3k views

Aliens to play a mischievous space-time practical joke on Earth

Premise Suppose an earth-like world in the near-future. Then aliens come and decide to play a mischievous trick on this world on an epic scale. The goal is to disrupt Earth's time by 18 minutes. ...
3
votes
3answers
323 views

Can Mercury's orbit be explained without relativity?

The orbit of mercury is different than rest of the planets. The reason for this seemed unaccounted for in Newtonian physics, and was later explained by Einstein's theory of relativity. Here is a ...
1
vote
1answer
156 views

How do I create the largest possible space habitat for humans? [closed]

So I'm making a post-FTL world in which humans are the first, and so far only, species to explore the stars. It's thousands (if not millions) of years in the future, and we've become post scarcity. ...
2
votes
3answers
128 views

How would a species in one dimension with its own properties go to another dimension with slightly different properties?

In my world, I have three dimensions, each of which have their own special properties. From each of these three dimensions come a master race of said dimension: From the first, the master race is a ...
36
votes
15answers
14k views

Could a really fast man catch a bullet?

Let's say that a character moves much faster (>100 x) than a bullet. If he is shot at, could he theoretically catch the bullet (and put it in his pocket) ? What happens when he touches the bullet, ...
6
votes
6answers
169 views

How much force do I need to create a fusion explosion or plasma with telekinesis?

Suppose a person, standing at sea level, could use telekinesis to exert a force around a sphere with a 10 cm diameter so that it becomes one-way permeable to air. As time goes on, the sphere becomes ...
5
votes
1answer
375 views

Using Microscopic Dimensions to Hide Objects

Idea prompted by Brian Greene's The Elegant Universe: String theory postulates microscopic dimensions in space. Could you conceal an object by rotating it into one of the microscopic dimensions and ...
-1
votes
3answers
158 views

Pirates, IN THE SKY? [duplicate]

Alright so the basics here are pretty simple. I want to have pirates, but in the sky, pretty much what you expected from the title there. BUT, and it is a big one, there is this little problem I keep ...
4
votes
1answer
103 views

What else changes with magnetic matter?

Consider a universe in which leptons & quarks (every fundamental particle that possesses electric charge) all have twins with magnetic monopole charge instead, resulting in two parallel kinds of ...
7
votes
2answers
157 views

Is the concept of my flying carpet possible?

My planet is tidally locked to its sun. It has a slightly thicker atmosphere than Earth. Over the planet’s sun-side surface, there would be no wind because that area is in the middle of a big cyclone/...
0
votes
1answer
74 views

What circumference would a no season temperate climate planet have

Imagine a planet, 3/4 water and 1/4 landmass. No axis tilt so the climate is moderate throughout the year. IE peak temperatures at 100°F at equator. It orbits a sun about the size of ours and has a ...
3
votes
7answers
2k views

Is it hypothetically possible to create a giant levee that is a non-physical forcefield or electronic membrane?

What examples are there in science fiction of molecular shields that can cancel out or "eat" certain molecules--and are they plausible? Is it hypothetically possible to create a giant levee that is a ...
1
vote
0answers
76 views

Physical Force Generation- Applications, weaknesses, and the science behind it [closed]

I've been developing this anti-hero, "Vicious," for a few weeks now- but I need some help concerning the specifics. Vicious has an ability known as "physical force generation." From any point on her ...
2
votes
4answers
271 views

Localized manipulation of the speed of light

I've recently read Alastair Reynolds' sci-fi best seller, Redemption Ark, where he explored the concept of manipulating an inertial frame overlaid on the quantum vacuum like many of the other ...
5
votes
4answers
203 views

Inhaling vastly more air than one's lung volume

For characters with Superman-style "super breath", the amount of air being forcefully exhaled is often vastly greater than is possible to hold in human-sized lungs. However, this poses two major ...
13
votes
10answers
3k views

How small can the universe be while still appearing infinite?

I'm working on a concept of universe creation. The best way to describe it in a sentence is the Judeo-Christian Creation Story but from God's point of view. My question is, staying as close to hard-...
22
votes
9answers
4k views

Indestructible silk: good armor?

I've been playing with different conceptualizations and types of armor for historical settings, especially armor with magic enchantments or made from weird materials. I was stuck thinking about ...
97
votes
10answers
9k views

Would planets be cubic in my “cuboverse”?

Summary The main idea behind the "cuboverse" is that spacetime distances are measured by (something close to) the sup norm or infinity norm. Under this norm, spheres (the set of points at a fixed ...
4
votes
15answers
2k views

Why would time travel affect the body in any major way, especially damaging? [closed]

Obviously, I'm talking about sci-fi time-travel and not just being as time moves by, slowly but surely. Is there a reason one would actually bleed from any orifice? For any pain to occur? Dizziness? ...
5
votes
6answers
239 views

Looking for a way to power a locomotive in a pseudo-1600s fantasy world

Assuming a world where there were no steam engines available, would it be possible for large passenger or cargo trains to exist? Would it be possible to use horse-engines to power a locomotive? If ...
7
votes
4answers
1k views

Would an explosion or energy discharge permeate to other spatial dimensions?

Let's assume there are more than 3 spatial dimension, for example 4 (the 4th not beeing time, but spatial) Would a common energy discharge, explosion etc. affect the 4th dimension? I am not sure if ...
1
vote
2answers
104 views

How would super heroes operate, save lives and minimize damage to property without breaking the laws of physics? [closed]

I lack the knowledge of basic or advanced physics to say that I know what I am asking, but there is a story that I am working on where I want to try to make super powers follow the laws of physics as ...