Questions tagged [physics]

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

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Energy manipulation based magic assisted by runes and objects

In my story I would like witches/warlocks/wizards/sorcerers/etc to use a kind of magic based on energy manipulation. To create fire the energy necessary to create and sustain combustion comes from ...
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How could animals, whose primary energy source is from internal combustion, have evolved? [closed]

Basically, I need a huge creature (about the size of a Cessna 172) to have enough power to fly for some hours per day, without having to eat tons of food. How could it have evolved to generate this ...
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3answers
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How could a magical enchantment minimize the effect a super dense and super heavy object would have on a floor beneath it?

In a story that I am writing, there is a specific race that has the ability to increase the density and strength of their muscles without the size of these muscles changing, through the consumption of ...
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2answers
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What technology could I use to manipulate gravity (for locomotion among other things) [closed]

The story takes place in our future, during the 25th century. I'm looking for a scalable technology that could allow something as small as a cyborg or personal vehicle to fly, or something as big as a ...
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2answers
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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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1answer
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Stability in Lowering a Space Elevator

First question on stack exchange I’ve been lurking and learning for years and finally decided to pose a question for a novel I’m working on. Given the appropriate advances in material sciences and ...
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3answers
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Is it theoreticaly possible to phase shift between alternate universe and/or realities?

It's something that's been used several times as a plot device on Star Trek, notably in the TOS episode "The Tholian Web", and the TNG episodes "The Next Phase" and "The Pegasus". I'm certain it's ...
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2answers
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How could an iceberg be created quickly?

For my middle-grade science-fiction novel, I need to come up with an invention or chemical that could rapidly create icebergs to refreeze the Arctic and slow climate change. Kurt Vonnegut's Ice-9 is ...
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1answer
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How big does a pelican type creature need to be to carry a grown up human inside its mouth and still fly?

as the title, my question is how big a pelican like creature with its pouch mouth need to be in order to carry grown up human and still fly. since as far as i know hollow bone is to fragile for human ...
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4answers
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Can I justify pyrokinesis / cryokinesis in a psychic-style magic system?

I've been going back and forth on my modern setting's magic system for a while now, but I've settled on a power-set that's closer to psychic powers than traditional magic, because of a couple of ...
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12answers
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A suit that realistically protects against impact, falling, being thrown around?

We all know a LOT of the soft sci-fi/science fantasy/mecha genre applies heavy doses of handwavium to sudden deceleration and impact injuries. Iron Man would realistically be liquified in his suit ...
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Most Alchemy-Resistant Material

[Clarification of an XY Problem] I am currently developing a world with a hard magic system based entirely on manipulating the natural order of reality in accordance with physical possibility. As ...
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Is teleportation plausible? [duplicate]

one of my characters can teleport himself and other small objects at will. It looks like something dissolving into dust when it teleports. Could this be particles disassembling and reassembling? Are ...
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How could an ability to project fire from your body occur plausibly?

Imagine the ability to shoot long streams of hot fire like a USM2 flamethrower from the palms of your hands. or shooting them out of your feet so you can push yourself off of the floor. An answer with ...
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Space travel energy limitations [closed]

For long distance space travel (between galaxies etc), I am trying to work out whether the amount of mass being transported is of significance, or is only the amount of drag important? For an example,...
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1answer
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Control of atmospheric conditions

Background: We discover an artifact in the present day somewhere remote. This artifact is in the form of a small (approximately phone sized) sphere, and when researched, it is discovered to have the ...
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2answers
269 views

What might be an effective mode of transportation for Giants?

In my story Giants, humans, and a bunch of other fantasy races live along side each other and i'm curious as to what might be an effective mode of transportation for 10 foot tall Giants with Ancient ...
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1answer
66 views

Probable way to send a moon on a collision course with its primary?

Background In my setting, there is some sort of cosmic war going on between two factions. This war climaxes in one of the warring sides having the moon of their home-planet being redirected into the ...
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Scources for metastable Metallic Hydrogen

Recently I've been looking into Metallic Hydrogen as a fuel for the vehicles of my fictional future world. The only issue is that I'm uncertain if the blasted stuff is metastable. And while I know ...
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6answers
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In what conditions could whales fly?

I am wondering if it is possible for whales to fly. I'm considering two different cases. How could we alter earth conditions (thickness, gravity) so that whales could actively fly (without changing ...
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3answers
127 views

Semi-FTL quantum communications

I'm trying to come up with idea's that have some plausibility of sending information FTL. So we can entangle particles together. When you measure them you influence them. If you measure one up the ...
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1answer
131 views

How fast would strange matter conversion go?

Background: So this Kurzgesagt video talks about quark stars, and how two of them colliding could send strangelets flying towards Earth or the Sun. Now it's been said that since, theoretically (as ...
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3answers
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Relativity, Time Dilation and multiple reference frames

I am doing some hard sci-fi worldbuilding and really want to get as much correct as I can, but the effects of high sub-light speed travel on the travellers is doing my head in. I've pored literally ...
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What is the science behind a wave that changes the laws of physics?

So I remember reading a long time ago about how a theoretical "wave" could exist, as the laws of physics suddenly changed in one place and then this rippled across the universe, basically at the speed ...
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How could you wipe out all life from the universe? [closed]

If you had as many resources as you needed, obviously making A LOT of assumptions about physics, how could you semi-realistically kill all living creatures in the universe?
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Could a hypothetically big enough planet, with an earth-like atmosphere, be big enough so that you cannot see its curvature from above?

I want to know if a planet with an atmosphere identical to that of Earth could be big enough so that from no point in the lower atmosphere it would be possible to appreciate the curvature in relation ...
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3answers
476 views

Feasibility of floating city-sized forests

My world is essentially a Neptune-sized gas planet that got seeded with life and its surface layer filled with oxygen, therefore gaining a sizeable layer with Earthlike conditions. Within this layer,...
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What would happen to a gas giant during a supernova?

Fairly straightforward question. Imagine a gas giant planet, like the size of Jupiter, in orbit around a massive star. The star goes supernova. What happens to the planet? Is the energy of the ...
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2answers
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An amusement park in space

I am wondering what could make an amusement park better if it was in zero G? the people that will visit are already used to living in zero gravity, so something that would amuse us earthlings for them ...
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3answers
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What if the Planck constant was exactly zero?

I was thinking of a parallel universe in which the Planck constant has an exact value of zero. How would this effect the physics of that universe and how would it effect the development of that ...
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1answer
299 views

Schwarzschild Metric in a universe with the same space time metric as that described in the orthogonal series, but with massive gravitons?

The universe described in the orthogonal series http://www.gregegan.net/ORTHOGONAL/00/PM.html is one, in which the minus sign in the space time interval is replaced with a plus sign. So this universe ...
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1answer
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Can multiple space habitats be joined by tubes?

I wanted to create an extremely large space city which will be made up of many different large space habitats of ringed and cylindrical varieties. Although each habitat will contain its own city or ...
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Would “land assist” technology be possible in real life?

In the game Call of Duty: Advanced Warfare, characters wear exoskeletons with an ability called "land assist", which allows them to slow down their fall using a jet of compressed air (or some specific ...
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How would a bird's flight change entering the zero gravity axis of an O'neil cylinder?

This question on space stack begins to tackle how a bird could fly inside an O'Neill cylinder, https://space.stackexchange.com/questions/27665/can-birds-fly-inside-an-oneill-cylinder. Here is the ...
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Is it possible to build a catapult strong enough to launch a person to the moon? [closed]

Lets say the advanced civilization never discovered rockets and for whatever reason never will. Is it possible to create some kind of mechanical device to launch a 90kg person to the moon from earth? ...
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Could a more convenient form of energy transfer/storage than electricity be possible?

I was thinking about the progress that has been made in terms of energy usage for e.g. transport purposes and noticed how the prominent source of energy had changed over time: first muscle power, then ...
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Is it possible to ice skate on an ice moon/world?

If you found out a way to produce a smooth icy surface on an ice moon like Ganymede, Enceladus, or Callisto, what kind of challenges would someone face if they tried to start ice skating? I figured ...
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5answers
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Absorbing heat from unlikely places

Living in polar climates can be quite difficult, and staying warm can often be such an issue. But not anymore with the heat sponge! This nifty little organ draws heat from even the coldest water to ...
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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 ...
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164 views

Liquid-breathing piloted craft

Let us assume at some time in the near future, medical science perfects a biologically safe liquid air solution. It can fill up the lungs of the adult human subject and they can breathe it potentially ...
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How to calculate the thickness of the ice layer of a frozen ocean planet/moon?

How do I calculate the thickness of the upper ice layer on cold ocean worlds like Europa, Enceladus, and Ganymede? I'm asking this for a programm I'm currently writing. The given/known quantities are:...
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5answers
305 views

Actual ramifications of time acceleration

For reference, the setting is urban fantasy, with a bit of hard science thrown in. One character can manipulate time; in this setting that means he can speed up his own movement through time. One of ...
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7answers
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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 ...
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6answers
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What happens if there is no Air Friction [closed]

In my world everything is formed from the following fundamental elements. Air, Water, Fire, Earth, Nature and Mana. I wanted my creations to be able to travel faster than the speed of sound with no ...
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5answers
402 views

Single-use nuke-propelled mass driver spaceship

So this is in the context where space battles are fought by ships that are little more than giant railguns (or other electromagnetic mass drivers), and therefore are fought at extreme ranges with very ...
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4answers
250 views

Microfracture in the ship's structure: good enough excuse to strand my characters? [closed]

I have the idea to have the engineer of a spaceship discover a "microfracture" in the ship's key structural framework (that was overlooked when prior battle damage was fixed) that has been slowly ...
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3answers
153 views

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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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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1answer
158 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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16answers
10k views

Black hole as a storage device?

I'm writing a sci-fi story, and there is a giant autonomous computer planet that constantly gathers resources from around the universe using drones. It stores a super weapon at the core of the planet, ...

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