Questions tagged [gravity]
For questions about the universal accelerative force between all objects.
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Person flying upwards at high speed after falling downwards [closed]
This question is a continuation of the one here.
This is for a book for my eight-year-old daughter, who loves science, and I am trying to involve as much correct science as possible.
A woman with a ...
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Would Artificial Gravity With Short Range Be Possible?
Assuming a spaceship with artificial gravity was possible, would it be possible for it to have an extremely short range, like a few feet. So you'd be able to have a ship with 1g but not have it ...
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requirements for spatial manipulation [closed]
In my story, I have a power system that allows humans to control certain universal forces. For example, chronomasters could control time and electromancers could control electromagnetism. Some spatial ...
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What is the lowest reasonable density for a Super Earth with earthlike living conditions?
A large planet roughly 3-4 times the mass of Earth. Trying to keep Gravity between 0.75G-1.25G for Earth-like Conditions.
I've looked into certain materials such as Silicon Carbide, which is ...
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How can I avoid the runaway greenhouse effect on a planet with 2x Earth masses and a dense thick atmosphere?
I've been working on a spec bio project with a planet which is 2x Earth masses with a dense atmosphere. However, I have one big issue : how do I avoid making a runaway greenhouse effect? Like the ...
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Could a planet 2 times the mass of earth have floating organisms in its skies
Can a planet 2 times the mass of earth have floating animals in its skys? I watched the netflix documentary series ailen world's and one of the exoplanets atlas was high gravity but was very dense so ...
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Finding a stable atmosphere for a different gravity
I am trying to find what would be a stable atmosphere for a planet, using this https://docs.google.com/spreadsheets/d/1cW7BIWlBUscqS9MVqs5gSbPH0OGzyE-j2cz6ADBSVzE/edit#gid=0 (you have to make a copy ...
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What would a planet where giant creatures live be like? (gravity, weather, etc.)
I am thinking about a planet on which gorilla-like people live in. Gorilla-shaped, walking on their knuckles, but with the capability of complex speech and a slightly more humanoid face (possessing a ...
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Is it possible to store the gravitational energy between planets somewhere in space? [closed]
Say I have a space station operating between Mars and earth. Can it somehow steal energy from
Mars- Earth
Earth - Sun
Sun - Mars
Combinations of gravitational pulls?
Would it distort he orbits?
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Can a tidally locked planet with two counter-orbit moons exist for at least 100,000 years?
I believe it is true (correct me if I'm wrong) that a planet with a significant moon such as ours cannot be tidally locked. The orbit of the moon would continue the rotation of the planet and must, ...
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High Gravity Giant Shell
I am designing a genus of eusocial, high-temperature, extraterrestrials from the planet 61 Virginis b. They are based on tungsten chloride and use sodium chloride as a solvent. This species has ...
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Decaying Planets
Assume there is this planet with only one type of life; a planet-wide mat of microscopic lithotrophs. These creatures eat through the surface of the planet over time, converting the surface into gas. ...
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Is there a reason for Rocket-style vertical takeoff craft when you don't need to bring reaction mass?
Reactionless Drives?
I have a sci-fi setting that takes place very far in the future. I like to think it tends toward the harder side of sci-fi, so I'm trying to minimize the number of Clarketechs (...
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How fast does this planet have to rotate to have gravity thrice as strong at the poles?
For those of you who have read mission of gravity, or researched Saturn’s equatorial bulge, you will know that the faster a planet rotates, the greater the “flattening” effect it’s rotation has. This ...
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World built inside a gigantic drainage pipe
I'm doing a Pratchett style fantasy book, and the setting - the Downspout - is built in a downspout of an astronomically sized gutter drain pipe.
We're assuming an impossibly large structure housing ...
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Orbital Mechanics of a shell world
I've created a Neptune sized shell world with properties that I find are not typical of other shell worlds. Its gravity does not come from a gas giant or a black it was constructed around, but from ...
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What would tires look like on a super-Earth with 2.5 G surface gravity?
A super-Earth has 2.5 G of surface gravity, as opposed to the Earth's 1 G of surface gravity. Some folks on it drive wheeled vehicles, and the wheels on said vehicles have tires on them. These tires ...
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Millitary applications of a gravity drive [closed]
Let's say gravity drives exist. This is a device that can power a spaceship by creating an artificial gravity well some distance in front of the spaceship that the spaceship perpetually falls into, ...
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Would it be possible to alter the gravitational field of a planet to one more suitable for human habitation?
I know low gravity can have negative effects on humans, and I would guess high gravity would also have negative effects. So would it be possible to increase or decrease a plant’s gravity to better ...
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Is there a way for a Super-Earth have Earth-like Gravity?
I have a planet about 2 Earth Radii large, and even at a lighter Density this puts it squarely in the 10 Earth Mass Range and about 2.5g. It's about 90% ocean, has a thick atmosphere, and near ...
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Would these solar systems be stable?
I have two solar systems in my world that I'm not sure would be stable. I'm not concerned about whether they could evolve naturally (they didn't), just whether they would be stable if set running.
The ...
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Turning possible a gigantic rock in the sky (sci-fi and magic)
Ok, we have magic to solve all my problems but I want to find if I can solve this "the most cientific possible".
I have a world that turns out to be the earth but in a post-apocalyptic ...
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If humans colonized a world with .75 earth gravity, would they evolve to be thinner and taller?
Humans are stranded on a world with .75 Earth gravity. How would that affect their physical evolution?
Specifically, would they be taller, thinner, and have less bone mass?
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Any way of having a breathable atmosphere with zero gravity in free space?(and universal directionality?)
Inspiration
This is heavily inspired by sunless skies in that sunless skies' world allows for the use of steam engines as space ship- equivalent (using steam jets as thrusters, while still able to ...
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Question on gravity and its relation to weight and force
I'm working on a character for a story that has the ability to somewhat play around with gravitational forces, mainly weight reduction stuff but I'm sure there's other applications. Practically this ...
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Could you use the gravity of an extremely close gas giant to assist in leaving a planet
Scenario: A gas giant knocked off orbit is projected to make an extremely close approach to our planet. Close enough to cause miles high tides, continent wide earthquakes, and send our planet on an ...
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Could a planet have 1/2 the Earth’s mass but 1 g surface gravity?
So, we have a captured planet/moon orbiting a gas giant in the habitable zone. It is akin to prehistoric Mars, its geological activity having been maintained by constant tidal flexing from the gas ...
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Effects on gravity on close binary planets
Let's say there's 2 planets orbit eachother as close as possible so they're oval shaped but not close enough to reach the roche's limit and be pulled apart. How would gravity be affected on the ...
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In a world where gravity pass from 1 G to 5 G in a cycle of 365 days, can planes fly all the time?
I am writing a book and I have this cenario. There is a planet where gravity pass from 1 G to 5 G in a cycle of 365 days. I know that humans can survive till 3-5G, but what about airplanes capability ...
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Does a planet's Core Mass Fraction affect its gravity?
Recently, I've been using a site called "The WorldSmith 3.03" in order to calculate some of my planet's physical characteristics:
Now, when it comes to the planet's gravity there is ...
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Functioning humanoid society with negligible gravity
In a fictional world, a humanoid species settles upon a foreign planet and intends to build a colony on this planet with an eventual goal of full habitation. They originally chose this planet for ...
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How would humans contend with low gravity when they colonize Titan?
So, in this setting, by the year 2139, humans have landed a fleet of settler ships on Titan to create the Asteria colony. They will repurpose the ships into anchored buildings, and stay there until ...
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Theoretically, would anti-gravity have a temporal component and if so what would that be? [closed]
This is purely speculative since we don’t know if we can actually create anti-gravity. Gravity and Time are two of the biggest mysteries in our universe. We don’t know why gravity is so weak or where ...
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What is the plausibility of people living on a planet with two suns? [closed]
Some of my characters travel to a planet orbiting two suns. They don't spend long there and it's implied some other species lived there before but don't anymore.
Is this possible? Would two suns ...
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The Moon turns into a black hole of the same mass -- what happens next?
If there were a black hole orbiting an inhabited planet, with the gravity of a typical moon (e.g our moon, orbiting a similarly weighted planet to ours), what practical differences would arise when ...
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Artificial Gravity using fans?
I've been wondering if it would be possible to simulate gravity utilizing nothing but large fans constantly blowing air downwards? This is obviously not an ideal setup for a gravity generator, but is ...
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Is there a point in the moon where the gravity is earth like?
Supposing, out of boredom, we were to settle on the moon.
I read that at certain depths on earth, the gravity is stronger than on the surface, so presumably the same is true to Luna.
If so, then is ...
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Generating gravity
how would I generate gravity in an orbital station without spinning in a really fast circle or making it as big as a planet, or would I have to cut my losses and just moon-base my idea (I'm trying not ...
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Can planet with three moons, have one tidal-locked both on rotation and revolution?
I'm a new D&D 5E Dungeon Master and I've found out recently about tidal locking.
For the first RPG setting I'm preparing with a friend, the planet the players will be on has 3 moons. Me and ...
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Can I get away with lowering gravity so that the usual solar masses in our universe are simply planetary masses in the setting's universe?
I want the world to have an extremely long age of discovery, such that even if they were to use a ship to travel in a straight line across their planet's ocean for hundreds of years they'd still be ...
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Could any photosynthesis occur at 5.5 AU on a warm planet?
I'm designing a habitable planet orbiting an M-dwarf, which is orbiting a G star at 5.5 AU. The orbit around the G star keeps the "night-side" (not technically an accurate term in this ...
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Would a Single Propeller Back Configuration make more sense for an Anti-Gravity Airplane then a tractor configuration?
I have a setting that is pretty similar to Earth. The tech is at least around WW2 with some steampunk fantasy sprinkled here and there. A global war is about to break out. My civilizations need an ...
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How strong would a planetary magnetic field need to be in order to lighten the weight of ferromagnetic metals? [closed]
I am writing a fantasy/sci-fi where humans crash-land on a somewhat earthlike planet (continental distribution, great masses of water, similar element's abundance), however, I would like for one of ...
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What would the weather be like on an earth like planet the size of Jupiter? [closed]
Let’s get this out of the way: yes, I have considered the fact that there would be a massive gravity difference, but I have figured out a way around it. (It’s implausible in our reality, but works for ...
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How to prevent the effects on gravity, climate and day-night cycles on a "planet" with a surface area nth time as big as earth's?
In my story, one key feature is that the earth-like planet or habitat has a surface area of earth > 10 times. However, as it is inhabited by pre-industrial humans that might have been brought on it ...
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If Venus were at .85 AU, Earth at 1.1 AU, and Mars at 1.4 AU from the Sun, would they disrupt each other's orbits at conjunction?
I have returned to this forum from Astronomy with this question because it immediately got down-voted. Maybe these hypothetical questions are more appropriate here? I am happy to take advice from ...
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How would differing gravity and atmosphere density affect aircraft?
I'm working on a story that involves a lot of interdimensional travel, but I know little to nothing about building the physics of entire planets. All I know about this one particular planet is that ...
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What are the effects of making a woman as light as a duck? [closed]
With a pinch of handwavium, Clarabelle the witch causes an accident. She became permanently as heavy as an ordinary duck, while her body remained the same.
Her density was forever altered. She is five ...
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A planet with huge rotation speed but also huge gravity?
Is it possible that a planet has a huge rotation speed and huge gravity so that at equator they mostly compensate for each other and the effective gravity is moderate (say, 1 g) but on poles the ...
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How fast do binary stars orbit each other? [closed]
Specifically I am wondering how fast a Class G star and a white dwarf would orbit each other in a type P binary system. How far away would they have to be from each other to have a stable orbit and ...
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