Questions tagged [physics]

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

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3
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2answers
351 views

Planetary Universe?

I'm working on the setting for a fictional story I'm writing and I wanted to inquire as to how possible massive-Universe-sized planets are radius: 5 × 1030M, without me having to re-make the laws of ...
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1answer
136 views

What to do with planet nine if it is a Black Hole? [closed]

Recently it's been theorized that "planet nine" may be a black hole. If this was the case what could we do with it? What unresolved problems in physics could be solved by having such a thing ...
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0answers
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In the orthogonal series, when finding the 4-force between two charges would the entire world line of each need to be taken into account?

Four-Velocity is the derivative of four-position with respect to proper time, four-acceleration is the derivative of four-velocity with respect to proper time, and four-force is equal to rest mass ...
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2answers
320 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 ...
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5answers
1k views

What locations in a galaxy would be best for stone carvings to remain undamaged or worn down for as long as possible?

I want a species of alien to leave their mark throughout the galaxy with stone carvings and temples. Taking influence from ancient religious stone carvings and decoratively sculptured temples carved ...
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2answers
198 views

Could a universe with different wavefunctions for elementary particles from those of our universe be self-consistent?

I was thinking of a universe that has the Heisenberg uncertainty principle, and in which there are elementary particles which cannot be subdivided into smaller particles. In this universe the equation ...
2
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1answer
79 views

Could A Building Hold A Kaiju?

Assume the Kaiju is 200 feet tall and weighs 4,000 tonnes. The building is 180 feet tall and pretty much your average flat building. Could most buildings carry that weight on top or crawling up the ...
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4answers
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Which type of star would be best used for a Shkadov thruster to reach Andromeda as soon as possible?

I had Originally thought of using Nicoll-Dyson beams to propel probes and small ships from the Milky Way to as many galaxies as they can reach to turn stars in those galaxies into Shkadov thrusters to ...
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2answers
202 views

What would happen to an indestructible meteorite?

A meteorite lands on our Earth. It is made of a rigid, indestructible material (containing a payload). When the meteorite strikes, its kinetic energy will cause a blast of stones, dirt, heat, etc. ...
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1answer
3k views

How dense can a human get until they “sink” through the ground?

If a human standing on bedrock could indefinitely increase their mass without increasing in volume, how much mass could they add to themselves before they start causing damage to the ground? How ...
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1answer
146 views

How tall/high must a pillar be for a person to take 6 minutes to fall from?

So basically, I'm writing a scene where my main character is standing on a very tall pillar in the middle of nowhere with his master. He learns the basics of this magic, but he doesn't have the luxury ...
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2answers
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Is a human body more dense (higher mass/volume) if acclimated to a higher ambient pressure (like in saturation diving)?

Say we are a person sitting in a diving bell and have saturated (acclimated) to an ambient pressure of 5 MPa = 5,000,000 $kg/m/s^2$, breathing a mixture of 99% helium, 0.8% oxygen, and 0.2% impurities ...
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2answers
161 views

Radiative atmosphere without heat convection

I was reading up on how a universe lacking heat convection would work, and asked a question here that was much too broad. This is me focusing the question much more. How would atmospheres with no heat ...
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4answers
129 views

Is it possible to make up a self consistent quantum gravity for a fictional universe?

I understand that for real world physics the current Theory of Quantum Mechanics, and current Theory of General Relativity are incompatible. I'm thinking about how one thing different about ...
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6answers
292 views

How to make my motorcycle rider survive driving into a wall?

Question I am currently trying to create a dramatic introduction for one of my characters, John Smith. The current iteration of the idea has him suddenly colliding with a solid wall on a motorbike, ...
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0answers
62 views

Could a universe with 3 or more $U(1)$ charges that are all equivalent to each other be self consistent?

In alternate universe there are at least 3 $U(1)$ charges. An elementary fermion can have a value of $±1$, or $0$ for any of these types of charge. The value an elementary fermion has for one of ...
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2answers
195 views

What scientific theories would support the existence of magic? [closed]

I am working on a dark fantasy world for my board game, and I want to have magic in it, but I have a hard time coming up with "reasonable" ways to explain the existence of magic without it ...
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0answers
2k views

How soon can the first stars form?

Introduction In our universe, the cosmic microwave background was formed approximately 400,000 years after the Big Bang. It was hot, but within a few million years after the Big Bang, it would no ...
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5answers
443 views

Feasibility of Energy-Absorbing Shields

So, I was looking at what defines the most interesting type of forcefields, and there came an interesting kind of forcefields that, rather than deflecting or dispersing energy, seems to absorb energy. ...
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2answers
141 views

Delta-v budgets and modified gravity

I'm building a soft sci-fi world where gravity works a bit differently: the acceleration due to gravity drops off at a rate much greater than our inverse-square; and the acceleration due to gravity &...
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3answers
162 views

Why would gravity/falling only affect certain ‘blocks’?

This is part of my minecraft universe scenario. In Minecraft, a popular voxel based game, gravity or the action of falling affects only certain blocks, namely sand, snow, anvils. Gravity/falling also ...
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2answers
126 views

If technetium has three stable isotopes, what does this mean for other elements

If technetium has three stable isotopes in a universe pretty much identical to ours, doesn't this mean that the weak nuclear force is different as well? How would a weak nuclear force allowing three ...
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3answers
393 views

Could a drone work as the reflector endcap of a laser sword?

One issue with a laser sword (light saber) is stopping the light beam at a desired length, There have different designs to re-create a similar effect using lasers and plasma, usually with some sort of ...
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1answer
161 views

How in general would molecular structures and interactions change if leptons were heavier or lighter than they should?

Continuing on with my questions regarding multiverses, I have observed in most theories that at least, the physical constants between universes would have changed. So parallel universes could have ...
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3answers
364 views

Are there any other colors to radioluminescence?

You are probably aware of that certain radioactive things glow, usually a soft green. But is there any way to add compounds or what have you to achieve a different color, say, orange? I know ...
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0answers
81 views

Possible future uses of Bose-Einstein condensates? [closed]

Using future technology what possible uses are there for matter in the form of Bose-Einstein condensates? I have heard possibilities of using it for communication and even weaponizing it, using the ...
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1answer
116 views

In the Orthogonal series, would the weak nuclear force have infinite range?

I read about the universe described in the Orthogonal series. It has 4 fundamentally similar dimensions, rather than 3 dimensions of space and one dimension of time as is the case with our universe. ...
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24answers
8k views

How to cool a room without a place to dump the heat

I've got a post-climate change world where summer temperatures make most of the planet uninhabitable, and the vast majority of the population lives in tightly-packed apartments either in buildings or ...
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2answers
91 views

What is the potential of generating the four fundamental forces?

To specify, one person cannot generate multiple forces and are born with only the ability to generate one of them. They cannot generate enough of any force that it could cause widespread mayhem, as I ...
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1answer
56 views

How far off the ground would an android have to hover to not cause damage with their ionic thruster(s)?

If a humanoid robot or other similar weight and sized robots used ionic thrusters on their feet/base of their body to fly and hover along the ground, how far would they need to hover from the ground ...
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3answers
508 views

Why would the most energy efficient shape be a cube instead of a sphere?

The most energy efficient shape in our universe is a sphere. However, in another universe it is a cube. Why and how would this happen? I came across this idea while thinking about Minecraft and why ...
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1answer
70 views

Can alternate universes (under Greene's Nine Multiverses Theory) exist with different matter and physics? [closed]

So, it is clear I was not clear enough with the previous thing about "handwavium", so I will try this question again and be more frank. Although, the main subject has changed to an extent. What I was ...
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1answer
43 views

Can a planet be in spin-orbit resonance with its parent and in resonance with other planets at the same time?

Mercury is tidally locked in a 3:2 spin-orbit resonance with the sun. Other resonances like 1:1, 2:1, 5:2 can occur as well. Many objects, like the moons of Jupiter, are locked in mean-motion ...
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5answers
251 views

Drawbacks of my Catastrophe Inhibitor

Warning lots of text ahead. The fluff: The story uses a Catastrophe Inhibitor (CatIn) to stop nukes, orbital bombardment and other such weapons from being the go-to method of defeating everything on ...
6
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1answer
767 views

Could a charge with more than 3 types be self consistent?

I know color charge has three types: red, green, and blue. There is also just one type of electric charge, with there being negative and positive electric charges. I was thinking of a universe, in ...
5
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1answer
186 views

How far could you see the Andes from the Pacific on a flat Earth?

Several questions on related subtopics of vision distance on a flat world have been asked before, but this one remains unaddressed. Specifically: The answer from Euclidean geometry would be infinite (...
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2answers
656 views

Behavior of neutron star material outside of neutron star

If there were some way (sub question: IS there some way?) to get neutron star material out of the gravity well of a neutron star, -say maybe a high-speed collision of two such stars- how would that ...
6
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1answer
88 views

Concerning asteroids and a trojan habitable planet

So I found a question on this site that talked about the possibility of having a habitable planet in a stable trojan position (a planet located at Lagrangian point L4 or L5 of a much bigger object). ...
3
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3answers
72 views

How to control a non-neural link controlled jumpjet/jetpack

When looking at movies and games, jumpjets/jetpacks are often easy to control. In games its a matter of a keyboard press away and in movies it more or less does exactly what the person asks of it, ...
3
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1answer
51 views

Secondary powers required to make an “air scooter” work for a person with wind powers?

When demons took over the modern world, they killed most of humanity, and for those that survived, at least in some cases, they started developing powers. For example, one of these powers is the ...
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10answers
4k views

Could scientists test a theory of everything?

I'm ready to reduce a certain amount of scientific rigor for a good story. In my world, some person invents a theory of everything. Is there a way that scientists would test the theory, to prove that ...
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1answer
133 views

How loud of a sound would a human-sized cicada produce?

Cicadas are known to produce very loud sounds which they make by rapidly buckling their tymbals, some of which are loud enough to exceed the threshhold that causes discomfort in humans (110 decibels), ...
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1answer
94 views

What impact would a white dwarf-neutron star collision have on a civilization on a planet orbiting the white dwarf?

An advanced civilization lives on an Earth-like planet orbiting a white dwarf. Their star is on a collision course with a neutron star. I imagine this collision will cause a supernova, which will ...
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4answers
108 views

Does echolocation work in these conditions?

The inhabitants of a small city carved into the side of a cliff are blind and use echolocation to navigate. There is a lot of empty space, around a kilometer of between the cliff side where the ...
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2answers
146 views

Could a universe with 3+1 dimensions, and spacetime curvature that is different from that of General Relativity be self consistent?

I was thinking of a universe that has 3 spatial dimensions and one temporal dimension, and in which the spacetime around massive objects is curved. However the geometry of spacetime near a massive ...
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3answers
2k views

Could you create a space craft that is powered by neutrinos mostly?

I was thinking whether neutrinos (or antineutrinos) could be used to propel space craft. This is because neutrinos are plentiful in the universe. What if neutrinos could interact through the weak ...
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1answer
111 views

Can you exist in a scaled up universe?

In this multiverse system, scaled down universes can be created by confining energy into a space with scaled down physical constants in proportion to the energy put in. Miniature universes of ...
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4answers
840 views

What would happen if we sped up the rotation of the Earth's core?

How fast does the Earth's core rotate currently, and what would happen if its speed of rotation were to increase dramatically?
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1answer
105 views

Effects of Deep Underwater Nuclear Explosions [closed]

I've tried looking this up but can't seem to find the right info. If a nuclear-level explosion went off at the bottom of the ocean, what if any effect would this have on the surface. I'm talking ...
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6answers
142 views

How can I expand the definition and some specifics of pyrokinesis?

I'm writing a sci-fi world where, if you put it in simple words, a small percentage of population can manipulate the matter. I'm not going to dive into specifics, because I'm still working on WHY and ...

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