Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [gravity]

For questions about the universal accelerative force between all objects.

5
votes
7answers
175 views
+250

A system for transporting people from a spinning ring up a conduit to a spaceship

I have a spaceship which is basically a cylinder a little less then a kilometer long. Attached to the ship by pylons connected to a hub is an inhabited ring which spins to produce a gravity-like ...
17
votes
9answers
3k views

Gravity magic - How does it work?

This question graduated from the Sandbox for Proposed Questions Gravity magic - How does it work? (What physical law can magic manipulate in order to affect gravity?) In my world everyone is ...
17
votes
5answers
3k views

Gravity alteration as extermination tool viable?

An alien race was rubbed the wrong way by humans being humans and decided that humankind has to go. However, unlike many other science fiction stories, they do not intend to give the humans even a ...
6
votes
3answers
200 views

Optimal proportions for flying humans?

There exist humans on a world with 35% the gravity of Earth and air five times denser. These people have invented wingsuits with extensions that go past their arms and enable them to fly by flapping ...
2
votes
2answers
58 views

Bicycles/human-powered vehicles on low gravity planets/moons?

In this scenario, humanity has managed to colonise some of the solar system, including Mars, some of the moons of Saturn and Jupiter and some of the larger asteroids of the belt. In most places they ...
12
votes
6answers
2k views

What would be some possible ways of escaping higher gravity planets?

I know that chemical rockets would allow for some minor loads to escape the gravity of a planet with higher gravity. My question is, what kind of technology would possibly allow a dominant species ...
22
votes
8answers
3k views

What could cause an entire planet of humans to become aphasic?

I'm working on a story in which there is some sort of planetary erosion of language. Humans lose the ability to communicate verbally (orally and written). They can remember having language, can even ...
-2
votes
2answers
91 views

How would gravity affect a torus-shaped planet? [duplicate]

My planet is a Super Earth about twice the mass of Earth. I'm not asking how it formed, although that would be nice to know. I mostly just want to know how long it would stay a torus shape, and how it ...
9
votes
7answers
1k views

Removing an item from a weight-sensitive pressure plate without triggering alarm [closed]

A character in one of my stories wants to steal a valuable artifact from a museum. The artifact is on top of a sensitive pressure plate, which is configured to trigger an alarm if the weight changes ...
1
vote
3answers
282 views

Controlling personal gravity – how would it affect a warrior's combat style?

So I have a character in a fantasy setting who is basically a human for the most part in terms of physical limits. They do have slightly stronger bone structure and greater endurance, along with ...
3
votes
1answer
268 views

Would a planet the size of Mercury with the gravity of Earth be scientifically possible? [duplicate]

I'm trying to do calculations for a planet around the size of Mercury with the gravity of Earth. Would the gravity be too high for a planet this size? Do I have to change some numbers, or is this ...
10
votes
13answers
3k views

How to increase a moon's gravity?

I am building a sci-fi universe where humans have colonized the moons of Jupiter. They are very small and thus have low gravity. In fact, some of them have gravity equal to less than 5% of Earth. ...
6
votes
4answers
220 views

Is the size of a portal going to limit the propagation of gravity through it?

It's a general question but my specific concern is whether different planets would crash into each other if a portal is made between them. We're assuming bare, naked, "hole in space" portals. This ...
4
votes
1answer
169 views

Floating cities with a new superconductor v2

I made a question regarding floating cities coming from a misunderstanding of this great answer. Luckily one comment showed me how floating cities could be possible in a slightly different scenario. ...
6
votes
2answers
74 views

Independently Tidelocked Moon?

Simple question that might seem odd. Not going to get too specific but I am curious, more or less, as to what it would look like for a planet that had a moon (A habital one) which was in essence ...
-2
votes
6answers
224 views

200G to 1G environment

Let's say a human were to live most of his life in a 200 G environment but then suddenly enter a 1 g environment, What would be the effects to his body and will this give him the ability to carry ...
25
votes
6answers
5k views

What would birds look like if they used buoyancy to fight gravity?

What would birds look like if they did not have to fight gravity to fly? The question comes from the premise put forward by some that gravity is not real and that what holds us down is pressure ...
4
votes
2answers
222 views

Floating cities with a new superconductor

Inspired by this great answer. There is a planet with: Floatium, a superconductor that behaves as such at 0 ºC and is found in nature. A stronger magnetic field than Earth's. In really cold areas I ...
3
votes
3answers
218 views

How does having 3 moons change a planet?

I'm working on a story that takes place on a world that has 3 moons. At least 2 of the moons are the same size. They align extremely rarely. Otherwise, it's an earth-like planet. There is one ...
7
votes
1answer
97 views

Co-orbits and Tides

I've seen many questions about tides and tidal variations on a wide variety of interesting single star, multi star, single planet, binary planet, single moon, multiple moon, and even ring system ...
8
votes
2answers
138 views

Tolerable range of surface gravities for interplanetary colonists?

Human physiology is adapted for life at 1G, but planets colonised by future humans will likely have different surface gravities. What is the range of values for surface gravity that humans can ...
1
vote
4answers
206 views

What is the “fullest” the universe could be in terms of living space? [closed]

Lets take a civilization that has surpassed the type III on the Kardashev scale. It has the following assumptions: It harnesses the energy of entire Galaxies, its populace did not transcend. If you ...
2
votes
2answers
113 views

Artificial satellite in a Binary Star System

Is it possible for an artificial satellite (in this case, an unmanned communications platform) to maintain a stable orbit directly around the barycenter of a Binary Star system, as in well inside the ...
1
vote
3answers
249 views

What would an earth-sized world be like if shaped like Ultima Thule?

Recently, pictures taken by the New Horizons space probe were released depicting the unusually-shaped object Ultima Thule. Now, suppose there was an world the size of the Earth, but in the shape of ...
3
votes
2answers
86 views

Amputees, cardio, and flying humans

How might the cardiovascular health of someone with both legs below the knee missing be affected? Would people be able to engage in activities that involve sustained cardio, like flying? Background: ...
6
votes
5answers
651 views

How likely is the flotsam of a space battle to be captured by our sun's gravity well?

A light-year distant from Sol saw the collision of a massive space-born battle fleet against an awe-inspiring dreadnought. At one point in the battle, the flotilla fired rail-guns with 100 metric ton ...
2
votes
3answers
216 views

What's the latest we would notice the gravitational effects of incoming super massive black hole?

Assuming we are unable to see the black hole via any way such as gravitational lensing, accretion disc or whatever. This is hand wave approach just to make my setting work, due to this answer which ...
4
votes
3answers
187 views

A planet with different gravity

I am trying to find an explanation to a planet in which the gravity is not constant, thus allowing some continents to be situated 2-3 km above surface while others are "grounded" on the surface. The ...
5
votes
5answers
452 views

Artificial gravity as an engine

I have seen some people talk about the idea of ships using their magical anti-gravity systems in a story in order to not only give ships a standard floor layout and inertial dampener systems, but to ...
-2
votes
5answers
185 views

If the earth is not flat, are we walking uphill or downhill? [closed]

If the world isn't flat and a person is walking around it from east to west. Is he walking downhill or uphill ? (This a stupid question on many levels, but I'm looking for intelligent answers.)
5
votes
5answers
228 views

Designing vehicles for different gravities

In my story, humans have colonized both a high-G and a low-G world in the same star system. How would surface vehicles have to be designed differently for practicality and economy on each of those ...
-3
votes
6answers
432 views

Can magnetism be what causes my flat Earth to accelerate?

It has been determined by observation of the stars that the gravity on Flat Earth is due to it accelerating upwards at 1G. This is what holds people and objects to the surface. It has also been ...
13
votes
3answers
2k views

Gravitational anomaly (Mascons) creating water-hills

A scenario in the far future -- The moon has been successfully terraformed. All problems have been worked-out, from flinging volatiles into collision course with the moon, up to creating and retaining ...
7
votes
2answers
173 views

Can I arrange my stars in a tetrahedron?

Inspired by this question: Consider a trinary star system, in which the three stars are arranged in an xy plane and all revolving the same direction, equidistant from each other. The inward pull of ...
6
votes
3answers
2k views

What is the natural shape of the atmosphere on a Niven ringworld?

Assuming the atmosphere on a Niven ringworld is retained by gravity, what shape would it be? Full details of Ringworld http://larryniven.wikia.com/wiki/Ringworld As I understand it, Niven proposed ...
3
votes
3answers
140 views

What Muscles in the Human Body Could Produce a Flight Stroke?

I have an idea for a story where humans on a low g planet with a dense atmosphere wear artificial wings to fly. I know that muscles they would use to produce a flight stroke would be in the upper body,...
10
votes
2answers
568 views

Planetary cave: Gravity inside a non-concentric shell

There are several previous questions concerning concentric shells. I won't reference them here because this is different. I understand that there is no gravitational effect inside a concentric shell*....
5
votes
1answer
131 views

Scale model solar system in interstellar space - will it work?

Now that FTL travel is here there are all sorts of family outings we can go on. One of these is a scale model solar system lovingly made by hobbyist Barty Slartfast. In full scale Sedna is three ...
4
votes
2answers
86 views

Planet Blob - variable gravity

On the planet Blob there is an unusual phenomenon. It is known to emanate from the planet's core but 2018-level scientists have no understanding of it. The phenomenon Gravity isn't constant. It ...
2
votes
2answers
109 views

Human Shoulder Motion & Powered Flight

I have an idea for a story where human live on world with low gravity and a dense atmosphere. These humans have developed artificial wings that are attached to their arms so they can fly. Since the ...
1
vote
4answers
140 views

Moon take off without rockets

Take-off in a craft with rockets allows a gentle acceleration that doesn't kill the occupants. Given that the Moon has no atmosphere: Is there any current technology that would allow safe takeoff ...
5
votes
3answers
201 views

Airships in a world with 1/3 gravity but 3 times the mass of atmosphere?

In the first question I posted here on Worldbuilding Stack Exchange, I asked if lifting gas would be more effective on a world with 1/3 of Earths gravity but with the same atmospheric composition as ...
5
votes
4answers
229 views

If an alien had evolved on a planet with 10 times Earth's gravity, how far into Earth's Ocean could they dive?

Let's assume that this hypothetical alien crawled out of the identical primordial ooze to the point where they share significant genetic similarity with humans, and due to either evolution or outside ...
3
votes
2answers
128 views

Would it ever be possible for humans to adapt to Jupiter's gravity?

If humans could travel to Jupiter, what ways would we have to adapt to the high levels of gravity? Would your blood flow to your legs and kill you from lack of oxygen in the brain? Would you get ...
4
votes
6answers
309 views

Reduced gravity on surface of planet

This is a simple question, hopefully not broad. My colonizing company wants to put little habitats on the surface of a planet with more gravity (2.0G) than earth. Is there a way to reduce gravity ...
1
vote
3answers
184 views

Could You Create a Stasis Field to Negate the Effects of Gravity [closed]

So I've been thinking about Stasis Fields lately, and wondering if there would be any way to create a Stasis Field that would prevent a person or object from feeling the effects of gravity from high-...
3
votes
6answers
296 views

Creating flying cities

Writing about suspended cities within a planet's atmosphere! The story itself focuses on the air forces that fight for each of the hundreds of floating city states living in the sky, but that's here ...
7
votes
2answers
166 views

Could the TRAPPIST-1 planets have moons?

The TRAPPIST-1 planets are all very close to each other and thus are subjected to strong gravitational forces amongst each other and to the red dwarf they're orbiting. Would it be possible for them to ...
5
votes
1answer
118 views

How does the n-body-problem affect a star system around a red dwarf?

So my story is set in the TRAPPIST-1-system and a rogue planet enters the system. When it's still far off, a scientist discovers that one of the numbers is slightly off. (She has some tables that ...
2
votes
3answers
472 views

Lifting Gas in a world with 1/3 of earth's gravity

As many of us probably know airships were one of the great forms of transportation in the 20th century but a great hindrance to their development was weight. In a world I am currently constructing the ...