Questions tagged [physics]

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

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1answer
46 views

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

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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1answer
64 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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3answers
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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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2answers
103 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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4answers
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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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0answers
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Concerning asteroids and a trojan habitable planet [closed]

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). ...
2
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1answer
91 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 ...
2
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1answer
94 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 ...
6
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2answers
368 views

To carry a person in its palm (like King Kong) how much pressure and at what speed would a kaiju need to apply?

Assume my kaiju is around 200 feet tall, weighs around 4,000 US tonnes and resembles a large lobster with two giant claws for its front legs and long spindly limbs with tiny pincers on the ends for ...
2
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2answers
145 views

Could a galaxy of Nicoll-Dyson beams hit a single target?

This was an idea for a flashback as I pick up my story around 100 trillions years from now at the point where star formation is ceasing and the red dwarf and stellar remnant era begins. Now living in ...
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5answers
647 views

An alternative way to rotate or in this case rolltate

As far as we know Earth and every other planet in the solar system rotate around their axes. Whether it be Uranus which rotates on its side or Mercury which rotates perfectly straight, all planets ...
7
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1answer
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Lightsaber + Pogostick: How would deceleration work on an extendable “arm” of pure handwavium-energy?

In my setting, I'm trying to develop interesting movement/combat mechanics. I asked a related question about ways of slowing free-fall descents in an effort to develop exoskeleton-enhanced parkour. ...
0
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1answer
88 views

How long would a planet that losses its gravity take to break up?

In my setting, one of the fallouts due to interstellar war between civilisations is that a planet's gravity can be removed. This capability is part of the setting's hyperspace mechanics so the exact ...
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3answers
67 views

Adopting a new calendar for a multi-generational space journey [Generations Novel]

This is a mixed physics and conceptual exercise: In my story, we are aboard a multi-generational mission to resettle Humanity on a new planet in our galaxy. In the internal life of the ship ...
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6answers
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Spacewalking in 0.3c - is it feasible? [Generations novel]

Imagine a spacecraft travelling at very high speeds, say 0.3c. While a crew member could theoretically suit up and perform spacewalking maintenance on the outer body of the ship, will they be exposed ...
3
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1answer
67 views

A Seafloor of Ice and Rock: Ice VI / Water Boundary

Many planets out there will be water worlds. Those generally come in two flavors: either the oceans are so deep that the water turns into high-pressure ices like ice-six, -seven, -ten and -eleven or ...
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1answer
156 views

How deep can the oceans be while still alowing some land?

Many alien worlds will most likely be water worlds. I was wondering what the deepest possible global ocean dept is where land is still possible. I think that volcanic islands will still have a chance ...
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23answers
3k views

A clothing material or other method to slow free-fall descent down walls

I'm working on a military sci-fi piece that involves a lot of exo-skeleton enhanced, well, parkour -- for lack of a better term -- and was wondering how to deal with descents from great heights. The ...
5
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1answer
100 views

Superfluid lifeform

Could a life form that uses superfluids as part of its biology exist? I've read in places that the issue for life outside of Earth and especially the theorised silicon lifeforms is that the existence ...
5
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1answer
85 views

How big could aquatic monsters get? [duplicate]

The worldbuilder's double-sucker-punch: the cubed-square law and atmospheric hypoxia. They suck because now you can't (realistically) have giant metal robots or terrestrial monsters the size of ...
6
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3answers
140 views

Intermediate Structures Along a Space Elevator

Assuming all the primary hurdles in building a space elevator are overcome, would it be structurally feasible to attach intermediate stops along the length of the tether (between the planet and GSO, ...
5
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2answers
223 views

What is the tallest mountain possible in any gravitational environment?

In world building it is often interesting to consider extreme landscapes – how tall can a mountain be on Earth for example. But what is the tallest mountain possible in any gravitational environment? ...
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2answers
120 views

How small and fast can a bullet go in atmosphere?

In many sci fi universes that don't have handheld energy weapons, they instead use solid projectiles that either go big (Warhammer 40k) or really small (Mass Effect). The former I have a pretty good ...
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2answers
110 views

What would happen to a block of warm ice (made out of pure pressure) once the pressure is gone? [closed]

Imaginary situation where you could exert 10GPA worth of pressure on a floating cubic meter chunk of water. According to this graph, it'd turn into ice even if it's still around the room's temperature(...
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4answers
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Question about Kessler syndrome

I'm writing a novel set in a post post-apocalyptic world, where society on Earth collapsed a long time ago and has rebuilt itself by the time the novel starts. I need a reason to keep the people ...
3
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3answers
1k views

How hard would be to make a concrete fluid container to explode?

The situation is that two magic users are fighting a concrete golem, their only way to defeat it is to destroy it, when this characters crack it they find that the golem is hollow so their strategy is ...
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3answers
72 views

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
69 views

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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6answers
133 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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2answers
126 views

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 ...
2
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3answers
2k views

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 ...
2
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1answer
103 views

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 ...
2
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1answer
147 views

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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12answers
3k views

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 ...
6
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4answers
151 views

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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0answers
59 views

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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1answer
102 views

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 ...
3
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0answers
56 views

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
49 views

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 ...
0
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1answer
69 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 ...
4
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2answers
288 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 ...
4
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2answers
144 views

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
789 views

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
140 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 ...
2
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3answers
132 views

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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4answers
150 views

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?
5
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1answer
136 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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2answers
198 views

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 ...
5
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2answers
108 views

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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2answers
261 views

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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