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Questions tagged [gravity]

For questions about the universal accelerative force between all objects.

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Would dumping vast amounts of electric charge into a traversable wormhole be a viable way to keep the wormhole open?

It's possible to have lots of electric charge while having only a small amount of mass, and a black hole with a significant electric charge has properties that are different from one with no electric ...
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348 views

Can a large hemispherical planet be stable? [duplicate]

I had a vision of a planet twice the size of earth sliced in half like an apple by an invisible force, one half drifting away from the other into eternity. Unlike the planet Earth, it did no longer ...
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1answer
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Could a black hole be used to lessen surface gravity on a Super-Earth?

Due to the moon's gravitational pull, objects at Earth's surface directly under the moon are slightly lighter. This tiny lessening of gravity would also take effect if the moon were on the exact ...
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1answer
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Could a form of acoustic levitation be used as artificial gravity?

So I heard about this thing on vsauce a while ago, where scientists use this thing called “acoustic levitation”. They use ultrasonic frequencies to levitate various substances, for use of studying ...
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2answers
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How feasible is this gravity-altering exotic matter I’ve conceived? Would it have any unforseen consequences?

Ok so I was thinking about a way to hypothetically have undiscovered elements with bizarre properties (for unobtainium purposes). And an idea hit me: replace nucleons with heavier but stable ...
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153 views

Could we give Mars Earth-like gravity using dark energy? [closed]

In the far future, humans are struggling with the idea of whether or not to use dark energy's repulsive-gravity capabilities to surround Mars in a sphere of it (regardless of how, let's assume they ...
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How likely are Coriolis-effect-based quirks to develop in starship crew members?

This one's more sociological, and it seems like a shoe-in to me, but sociology was never my strength. Given how pronounced the Coriolis effect of a smaller Von Braun wheel would be, does it seem ...
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Drawing landmasses for this odd-shaped planet

I've just come here for some help drawing a map for this fictional planet where two roughly similar planets have been smushed into kind of pear shape like this: So this planet spins on an axis which ...
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2answers
98 views

What's the fastest way to move on foot in low gravity [duplicate]

Say you're in a combat situation on a low gravity world and you're trying to move from one bit of cover to the next as quickly as possible. How would you do that?
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3answers
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Implications of cigar-shaped bodies having rings?

In my Conworld's system, There is a porous asteroid large enough to be a dwarf planet (but it's mass is too small to pull it into a spherical shape) that has rings. How they got there, nobody knows. ...
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How large can a rocky planet be? [duplicate]

What is the maximum diameter and mass can a rock-based planet be before it collapsed to degenerate matter? If "rocky" isn't defined enough, assume basalt. "Degenerate" means the planet (or at least ...
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1answer
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Speed of light, Motionlessness, and Time Travel [closed]

i want to ask something I quote from some web and got this : 'According to Einstein’s Special Relativity Theory, time is affected by speed. It’s already been proven in the lab that subatomic ...
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8answers
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Effects on objects due to a brief relocation of massive amounts of mass

I want you to meet Gary. Gary looks like a human, walks like a human, and talks like a human. But he's not. He's a superhero, or a magician, or... something. He's not really sure. He just knows that ...
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2answers
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What phenomenon (gravitational?) in space would allow the transfer of humans rapidly between two planets or system-wide?

So what I'm looking for is some plausible idea of two human planets, orbiting each other closely, that despite having regressed to a medieval homage, were capable in this old era of powering solar ...
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6answers
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Can a planet have a different gravitational pull depending on its location in orbit around its sun?

As the title say, can a planet have a different gravitational pull depending on its location in orbit around its sun? Is this explainable without magic?
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Doomsday-clock for my fantasy planet

I want the surface of my fantasy planet to be made hostile every few thousand years for long enough to make every species go extinct that breeds on land. The easiest explanation seems to be other ...
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0answers
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Humans separated by two terran planets one 0.8g, other 1.4g [closed]

I am writing lore for a project and am mostly clueless about gravity's effect on human beings in these circumstances. The brief history is that bronze/iron age people had access to "primitive" ...
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5answers
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Could gravitational lensing be used to protect a spaceship from a laser?

Suppose Ship A is being targeted by Ship B, which intends to use a laser weapon in an attempt to destroy Ship A. Ship A has special technology that allows it to alter gravity (mainly used for ...
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3answers
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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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4answers
2k views

Would a high gravity rocky planet be guaranteed to have an atmosphere?

I want to create a planet with a deep gravity well, say about 12G at the surface. At first I wanted the planet to have either no atmosphere or a very thin one. But I want this to be as close to ...
10
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1answer
237 views

Can the event horizon of a black hole be distorted or destabilized by an extreme spin rate

Assuming that there is a means of increasing the spin rate of an existing black hole, what would happen to the shape of the event horizon as the spin rate was increased? In extremis what would ...
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10answers
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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 ...
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9answers
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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 ...
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9answers
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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 ...
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3answers
222 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 ...
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2answers
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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 ...
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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 ...
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8answers
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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 ...
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2answers
101 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 ...
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7answers
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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 ...
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3answers
288 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 ...
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1answer
294 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 ...
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13answers
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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. ...
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4answers
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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 ...
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1answer
191 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. ...
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2answers
76 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 ...
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6answers
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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 ...
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6answers
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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 ...
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2answers
228 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 ...
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3answers
228 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 ...
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1answer
106 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 ...
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2answers
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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 ...
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4answers
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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 ...
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2answers
118 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 ...
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3answers
253 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
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2answers
88 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: ...
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5answers
689 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 ...
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3answers
225 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 ...
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3answers
191 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 ...
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5answers
481 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 ...