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Q&A

Posts tagged physics

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Q&A Plausibility of helium dominated atmospheres on super-Earths

I've been using this helpful diagram a lot for worldbuilding. Now I came to think about the fact that helium is more massive than hydrogen, thus a scenario where hydrogen escapes, but helium is ...

1 answer  ·  posted 4y ago by TheDyingOfLight‭  ·  last activity 4y ago by TheDyingOfLight‭

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Rigorous Science How do ballistic trajectories work in a rotating cylinder world?

For the sake of fixing some image in your mind, imagine you want to practice some sport in a rotating cylinder world: whether it be launching a javelin, strike a tee at the golf club or scoring a 3...

7 answers  ·  posted 4y ago by L.Dutch - Reinstate Monica‭  ·  last activity 4y ago by L.Dutch - Reinstate Monica‭

Question physics
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Rigorous Science 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 ...

0 answers  ·  posted 5y ago by HDE 226868‭  ·  last activity 4y ago by HDE 226868‭

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Q&A How can a being that can create electric attacks use targeted lightning storm strikes?

I found one question that deals with how to make lightning from clouds strike a target person, Can we make lightning strike a certain person? but I am looking for something that doesn't involve tec...

1 answer  ·  posted 4y ago by RandySavage‭  ·  last activity 4y ago by RandySavage‭

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Rigorous Science Can two moons have intersecting orbits yet be guaranteed not to collide?

Working on a D&D campaign. As a physics nerd, I'd like the orbital mechanics of the planet, its sun, and its moons, to follow standard Newtonian/Keplerian mechanics. I'm trying to come up wit...

5 answers  ·  posted 4y ago by Frank Harris‭  ·  last activity 4y ago by Frank Harris‭

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Q&A How might an exoplanet have a highly radioactive atmosphere?

The exoplanet in question is Proxima Centauri b. How might the mid-to-upper-level atmosphere of that planet be dangerously radioactive and full of airborne nuclear reagents, without it being the do...

2 answers  ·  posted 4y ago by ZarHakkar‭  ·  last activity 4y ago by ZarHakkar‭

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Q&A Can a planet's artificial ring always face the sun?

A habitat/space harbor ring encircles an ice giant crossing both poles (polar orbit) and rotating to create artificial gravity. Can the ring also precess in synchronization with the planet's year,...

1 answer  ·  posted 4y ago by wetcircuit‭  ·  last activity 4y ago by wetcircuit‭

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Q&A do these mountains look to be in realistic locations?

I'm getting into mapmaking, which I enjoy, but some of the specifics of realism still elude me. I know generally how plate tectonics work, but I was hoping to get some help on a specific example. I...

2 answers  ·  posted 4y ago by Daniel Coolbear‭  ·  last activity 4y ago by Daniel Coolbear‭

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Q&A Cheapest material per ton on earth?

What is the cheapest material per ton that one could purchase on our Earth in the 21st century? This could also include the cheapest material per ton to harvest so dirt may seem like the obvious an...

4 answers  ·  posted 4y ago by CodeCamper‭  ·  last activity 4y ago by CodeCamper‭

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Q&A Super insulated box/room to store extreme heat possible?

Is it possible in 21st century Earth for someone to create a small super insulated box to store heat like an "anti-freezer" such as putting lava inside the box and the box not being hot to the touc...

5 answers  ·  posted 4y ago by CodeCamper‭  ·  last activity 4y ago by CodeCamper‭

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Q&A Can adding mass to a ringed planet cause a huge chain reaction?

I've been wondering about this for a while. Here is the research I've done so far that lead me to ask this question: A planetary ring system is most often formed by the breakup of objects within ...

2 answers  ·  posted 4y ago by overlord - Reinstate Monica‭  ·  last activity 4y ago by overlord - Reinstate Monica‭

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Rigorous Science Is there a safe but weird distance from black hole merger?

I wish to create a world such that it can support the following plot point: the world experiences gravitational waves that are directly noticeable to the human population (i.e. they can feel or see...

2 answers  ·  posted 4y ago by SO failed us all... Bye...‭  ·  last activity 4y ago by SO failed us all... Bye...‭

Question physics black-holes
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Q&A Will it possible to transform thermal energy into electrical energy some day?

Thermal energy is everywhere on earth. If it could be transferred into electrical energy it could serve as a great energy source. This idea is violating the laws of thermodynamics. But it's not ...

5 answers  ·  posted 4y ago by somega‭  ·  last activity 4y ago by somega‭

Question physics energy
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Q&A is there a way to levitating entire body of water in earth and make it stay in the sky?

as the title, is there a way to levitate entire body of water in earth and make it stay in the sky (not cloud and still in liquid form) ? either natural or man made. the water either flowing or c...

3 answers  ·  posted 4y ago by Li Jun‭  ·  last activity 4y ago by Li Jun‭

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Q&A What would be the dangers of creating matter from nothing

Dear top secret science network, Humanity was visited by visitors from another universe altogether (one which doesn't obey our laws of physics) - the D'jini. A diplomatic convoy of them apperead o...

4 answers  ·  posted 4y ago by Lause‭  ·  last activity 4y ago by Lause‭

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Rigorous Science Is it possible to build a black hole (kugelblitz) gun?

Assume that space warfare is dominated by gamma and x-ray lasers (Wakefield-Plasma and Free Electron Lasers) capable of killing targets several light-seconds away. Stealth in space is possible due ...

2 answers  ·  posted 4y ago by TheDyingOfLight‭  ·  last activity 4y ago by TheDyingOfLight‭

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Q&A what would it need to create indestructible bubble?

Not exactly indestructible, at least after flying to certain height it may pop out. I mean something like the bubble is as hard as stone or steel but still elastic and light to float like bubble, ...

2 answers  ·  posted 4y ago by Li Jun‭  ·  last activity 4y ago by Li Jun‭

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Rigorous Science Neodymium magnets as nanoparticles bonded with atmospheric amide to create a magnetic 'air curtain'?

Amide bonds are extremely stable and their half-life for hydrolysis in neutral aqueous solution is estimated to be seven years. Amides bind to metal ions through the carbonyl oxygen. Neodymium Mag...

2 answers  ·  posted 4y ago by System‭  ·  last activity 4y ago by System‭

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Q&A What planet composition is need to have giant human that make earth human similar in comparison to ant size to them?

as the title say my question is: What planet composition is need to have giant human that make earth human similar in comparison to ant size to them? i know realistically and probably its imposibl...

3 answers  ·  posted 4y ago by Li Jun‭  ·  last activity 4y ago by Li Jun‭

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Q&A Designing (a specific kind of) dark matter

There are exactly 2 force laws that can produce stable closed orbits: proportional (spring force) and inverse-square. The inverse square law occurs naturally for monopole central forces in 3 dimens...

1 answer  ·  posted 4y ago by Logan R. Kearsley‭  ·  last activity 4y ago by Logan R. Kearsley‭

Question physics
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Q&A A supercomputer around the sun

I wish to build a sort of Dyson swarm around the sun. Not to transmit energy, but to put supercomputers in each satellite so they can calculate spatial trajectories. The main idea of the project i...

3 answers  ·  posted 7y ago by PatJ‭  ·  last activity 4y ago by PatJ‭

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Q&A How could formamide lakes form on an exoplanet?

I've been recently looking into alternative biochemistries for life and the environments were these could be found. I already asked a question about how ammonia oceans might form a while back. Toda...

3 answers  ·  posted 4y ago by TheDyingOfLight‭  ·  last activity 4y ago by TheDyingOfLight‭

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Q&A A feasible and efficient method of fast global travel?

What would be an efficient method of global travel that can take you from, let's say, London to Hong Kong in about an hour? It would preferably be made quickly, but money is no object. I don't want...

10 answers  ·  posted 4y ago by Greenie E. - Reinstate Monica‭  ·  last activity 4y ago by Greenie E. - Reinstate Monica‭

Question travel physics
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Q&A How strong is my hellstone, if about half a mile in diameter pillars of hellstone hold up about a mile of Earth above it?

The pillars are spread out about a mile apart each, and they all come straight from the ground, slowly gets just a smidge smaller in the middle, and then get bigger near the top, reaching a height ...

2 answers  ·  posted 4y ago by michael griffin‭  ·  last activity 4y ago by michael griffin‭

Question physics materials
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Q&A How to protect oneself against strong magnetic fields?

Spacecraft in my Scifi setting use strong magnetic fields for many purposes. Fusion containment, magnetic nozzles, gauss guns, magnetic fields as pusher-plates for nuclear pulsed propulsion and def...

3 answers  ·  posted 4y ago by TheDyingOfLight‭  ·  last activity 4y ago by TheDyingOfLight‭

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Q&A What would be the fate of a second satellite at the mid-point between the Earth and the Moon, with half the mass of the Moon?

If this hypothetical moon were to come to exist between the Earth and Moon, how long would it survive? And could it transition to the moon's orbit, as a subsatellite? To clairify, this scenario is...

2 answers  ·  posted 4y ago by Wax‭  ·  last activity 4y ago by Wax‭

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Q&A How plausible is an Alcubierre drive, really?

Like on a scale of one to ten, how plausible are Alcubierre drives in terms of our current understanding of physics? Plausible enough to be considered "hard sci-fi", or are they just another form o...

7 answers  ·  posted 7y ago by Z.Schroeder‭  ·  last activity 4y ago by Z.Schroeder‭

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Q&A Air Pressure in a Purely Underground Setting

I'm working on a completely flat, underground world, where "world" means "universe" rather than the equivalent of "planet". Here's what I have so far: The world is a flat, apparently infinite (in...

2 answers  ·  posted 4y ago by Kinxer‭  ·  last activity 4y ago by Kinxer‭

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Q&A What Technology is Needed to Virtually Simulate...Everything?

This is not my question. In my story, I have a machine that you can connect to using electrodes. It allows one to enter a small virtual reality room where everything from gravity and electromagnet...

5 answers  ·  posted 4y ago by overlord - Reinstate Monica‭  ·  last activity 4y ago by overlord - Reinstate Monica‭

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Rigorous Science Solving the biggest problem of relativistic interstellar spacecrafts

In FTL-free universes, interstellar travel is often done by vessels capable of continuous acceleration (the drives themselves are often magitech), which can use the effects of relativistic time dil...

2 answers  ·  posted 4y ago by TheDyingOfLight‭  ·  last activity 4y ago by TheDyingOfLight‭

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Q&A Is a Heliostationary Receiver realistic?

Advance our technology 200 years, develop very precise celestial navigation controls and very efficient nuclear reactors. Distill to ensure only the most stable elements are used in production, cos...

4 answers  ·  posted 4y ago by Vogon Poet‭  ·  last activity 4y ago by Vogon Poet‭

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Q&A What kind of faster-than-light travel is this and is it at least plausible?

I've had a fairly complex world built up in my head for several years and finally writing a story in it. One thing I'm struggling with is explaining the galaxy's faster-than-light traveling. It's n...

4 answers  ·  posted 4y ago by snowymacie‭  ·  last activity 4y ago by snowymacie‭

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Q&A Viability of using temperature difference to generate energy on a tidally-locked planet

In Larry Niven's Ringworld, the Outsiders lie with one half of their body in the shade and one half of their body in direct sunlight and use the temperature difference to generate energy. Would thi...

3 answers  ·  posted 4y ago by Connor‭  ·  last activity 4y ago by Connor‭

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Q&A Energy manipulating superhero -- how would it work

I want to make a superhero that can control all forms of energy. From what I've heard you can do a lot like, manipulate time and space, open blackholes, teleport, shape shift, and manipulate matter...

4 answers  ·  posted 9y ago by Aaron Tuturro‭  ·  last activity 4y ago by Aaron Tuturro‭

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Q&A 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 funda...

4 answers  ·  posted 5y ago by B.fox‭  ·  last activity 4y ago by B.fox‭

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Q&A Is it possible to surf on molasses?

I recently came into possession of a rather large mass of molasses due to a misunderstood Alexa inquiry and since the restocking fee is outrageous, I plan on using it to answer a nagging question I...

3 answers  ·  posted 4y ago by Glen Pierce‭  ·  last activity 4y ago by Glen Pierce‭

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Q&A How much energy would a character need to disassemble and reassemble thier matter?

I wanted to have characters that can control energy and matter, so Dr Manhattan came to mind as a great example of a character that does that. Information on him says that he has complete awarenes...

1 answer  ·  posted 4y ago by RandySavage‭  ·  last activity 4y ago by RandySavage‭

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Q&A Hidden specks will blow up the world if overheated: how bad a thing is this?

I'd encourage you to take about 4 min to read the whole post. Multiple masses of parabanic acid appear at random around the world (but see Context and constraints), displacing any matter in their ...

1 answer  ·  posted 4y ago by kly‭  ·  last activity 4y ago by kly‭

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Q&A How might a scaling "force field" work?

To Whom It May Concern; I'm going to be blunt: I'm terrible at formal letters. I've just recently arrived at our new home. I find it amazing! The city design leaves something to be desired, but I ...

1 answer  ·  posted 4y ago by Frostfyre‭  ·  last activity 4y ago by Frostfyre‭

Question physics technology
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Q&A Mirror to the past

Are there any holes in the following reasoning? Black holes form gravitational lenses. So they bend light. Is it possible for an observer to see his own past image as a result of light bending aro...

2 answers  ·  posted 4y ago by Banish‭  ·  last activity 4y ago by Banish‭

Question physics
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Q&A Black Hole as a Storage Device Version 2

This is based on: Black Hole as a Storage Device What goes into a black hole doesn't come out (except as random electrons or positrons). However, is it possible to store something within the eve...

4 answers  ·  posted 4y ago by ShadoCat‭  ·  last activity 4y ago by ShadoCat‭

Question physics black-holes
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Q&A How can compressed air jet from a characters hands?

I was wondering if there is a way to have a person with added organs and systems to be able to shoot jets of compressed air out of their body without them needing a giant gas bag or massive lungs? ...

2 answers  ·  posted 4y ago by RandySavage‭  ·  last activity 4y ago by RandySavage‭

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Q&A 'Air' in Space & Planetary Rotation

I recently heard that before anyone had begun to build practical aircraft of any kind, it was thought by some that once flight was achieved you would be able to simply fly to another planet. The d...

1 answer  ·  posted 4y ago by moran‭  ·  last activity 4y ago by moran‭

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Q&A What physiological tools would a humanoid need to generate ultra-low frequencies?

I'm interested that some ULF (ultra-low frequencies, especially the 17 HZ zone) can cause humans to experience sensations of fear, trembling, or even claims of seeing ghostly apparitions. What an i...

1 answer  ·  posted 4y ago by Jarrison_93‭  ·  last activity 4y ago by Jarrison_93‭

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Q&A Suit for very fast running

Using the modern technology, is it possible to have a suit which will allow to run at Mach 12 (~4km / s)? For simplicity let's ignore the landscape issues (i.e. "what happens if I run into a buildi...

3 answers  ·  posted 4y ago by Alma Do‭  ·  last activity 4y ago by Alma Do‭

Question physics
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Q&A How high in the air would an object have to float to ensure that a medieval society cannot reach it, no matter how hard it tries

Let's assume some things: The ground under the object is flat land. The object always remains in the same position. The object is clearly visible from the ground. It is a high priority for the pe...

5 answers  ·  posted 4y ago by Aureus‭  ·  last activity 4y ago by Aureus‭

Question physics technology
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Q&A The Mighty Generation Ship Jupiter

"The planet moves." Inspired by this link in a comment from Gryphon here, I also see the concept in this question. We've colonized the moons of Jupiter adjusted their orbits to our satisfaction (...

2 answers  ·  posted 5y ago by Pelinore‭  ·  last activity 4y ago by Pelinore‭

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Q&A How would much smaller heat capacity of water affect the life on Earth?

Water, as is, with its physical and chemical properties, is the base of any living being on Earth. Water has a rather high specific heat capacity of 4.184 J/gC, which in itself has a great effect ...

1 answer  ·  posted 4y ago by Arteminio777‭  ·  last activity 4y ago by Arteminio777‭

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Rigorous Science Punching someone and sending them flying at the speed of sound

How much force/energy is required to punch someone so hard that the person is sent flying at the speed of sound? Also, what can you compare the force/energy to? For example, is it comparable to a ...

2 answers  ·  posted 5y ago by Hajhar‭  ·  last activity 4y ago by Hajhar‭

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Q&A How to tackle one or multiple submerged continents

A part of the story I am writing involves two continents that centuries before the story takes place sunk into the sea. I want to have a way to explain this that does not come down to just the sea...

5 answers  ·  posted 4y ago by Blue Devil‭  ·  last activity 4y ago by Blue Devil‭