Questions tagged [gravity]

For questions about the universal accelerative force between all objects.

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9
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3answers
881 views

Can a larger mass of stellar engines move a galaxy's dark matter?

There have been ideas about moving galaxies, if all of the needed stars and black holes become stellar/black hole engines but due to the 1:5 ratio of matter and dark matter there will not be enough ...
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0answers
31 views

Creating stable gravitationally bound alternatives to a single ultra massive galaxy?

Before the accelerating universe makes it impossible without FTL to reach other galaxies the advanced civilization in my story aims to create their own super system, which will remain gravitationally ...
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1answer
105 views

Sigelon's Terrible Neighborhood

Sigelon is a mountainous world that's volcanically-active due to flybys with a larger neighboring planet that has a more eccentric orbit. These volcanoes release enough soot and smog to periodically ...
4
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2answers
102 views

How could a starship take on a planet-massed passenger without noticing?

tl;dr: How could one ship transfer a planetary massed being to another ship without them noticing the gravity field during the operation? How could two ships rendezvous in deep space with one of ...
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2answers
196 views

Would A Gravity Blade Be Possible To Create?

I am wanting to use gravity based weaponry in my plot. One of my ideas was to have some sort of blade that could focus extreme gravitational forces at the edge of the blade to slice through matter (...
-4
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0answers
95 views

Could gravity exist without gravitons?

If a universe were finite and enclosed (limited by something unknown) then any object with mass might push against it, bending the space around it, causing gravity or “smoosh” e.g. there is no ...
5
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2answers
96 views

Safe and non noticeable changes in gravity

I was wondering what would be the most percentage change in gravity that a human would not notice and would be safe for the body functions? I am designing a rotating space habitat and I want to know ...
4
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4answers
3k views

Does the interior surface of a Dyson Sphere exert gravity?

The interior of this particular Dyson Sphere is so large that it encapsulates a star at its center. Otherwise it is filled with breathable air which creatures can breath and fly in. I imagine that for ...
16
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2answers
4k views

What size is the largest known molecule anywhere in the universe?

I understand that generally, beings get as big as the thing(land, sea etc)they live on or in however another celestial object can interfere with size, like the moon and ppl got smaller. But can a ...
2
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1answer
126 views

Elaat (of HighFleet) is a large planet (6.6x Earth), but much less dense than Earth. Are there such rocky planets? [closed]

According to this reddit post, Elaat, the fictional world of HighFleet (steam link, humble bundle), is 159758.26 mi around. Compared to Earth's ~24,000 miles. (about 6.6x) Yet in game, large thruster-...
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6answers
2k views

Can a supersized collection of tethered large space structures exist?

I wanted to create a main destination/headquarters for each galaxy in my story but a single planet or megastructure didn't seem grand enough. My idea is to have a vast number of structures from ...
2
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2answers
150 views

Sprinting Downforce on Titan

Since Titan has high air pressure, but low gravity, could settlers there wear wings or other methods of downforce (passive or active) on their suits/clothes to keep themselves grounded while they run? ...
5
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2answers
321 views

What is the largest achievable oxygen-atmosphere world?

I am trying to calculate the largest world that will meet the following criteria: Exists within the Goldilocks zone of a G2V star similar to our sun. Is survivable long-term by anatomically modern ...
8
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3answers
378 views

Preventing black hole formation in a water-filled universe

Imagine a universe full of water. A comfortable 22 degrees Celsius warm, density of about 998 grams per liter, and it fills up everything for as far as can be observed. There's nothing else; neither ...
4
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1answer
72 views

Convection Cells in the Atmosphere of a Jupiter-Sized Planet

Background The setting for a story I am creating is an earth-like planet near jovian surface area, existing in a universe where the force of gravity is appreciably weaker than in our own, such that a ...
5
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6answers
1k views

Flight in Zero Gravity

In short: my last post was about a world of flying islands. The world is like a huge gaseous sphere (with the same gases as the Earth's atmosphere, but without the effects of pollution) with several ...
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3answers
231 views

What would a human genetically modified to thrive in low gravity look like?

Really just what the title says. If a human was genetically reengineered (assume super-futuristic-magical level genetic engineering capabilities) for microgravity, what would be some likely changes? ...
0
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2answers
175 views

Could one triple the moon’s mass without it colliding with earth if it was done slowly enough?

In my story, Earth is dead, and for religious reasons, humanity decides it needs to live on the Moon now. However, they want to triple the mass of the Moon to increase gravity to 5m/s or so. Assuming ...
18
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6answers
5k views

How noticeable would it be if gravity decreased to be around 90%? [closed]

I am wondering how it would feel if gravity suddenly got reduced to be around 90% of what it was. Like if a person was not paying attention or was asleep, would they notice?
5
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0answers
89 views

Visual gravitational effect of cosmic string network on background light

A scientific paper last year proposed the idea of cosmic string life-forms which could flourish within stars. The basic idea is that cosmic strings,theoretical topological defects from the early ...
3
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4answers
143 views

What kind of air currents would be made in and around reverse-gravity bubble fields?

Bubbling up some ideas Last night, one thought plopped one after another in my mind, and one of them was about adding local space anomalies which reverse the force applied through gravity. They're ...
2
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3answers
162 views

If the world was flat, what would happen if someone walked off? [closed]

A character jumps off the edge of the world in my sci-fi story. Would they float or would they just fall?
3
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1answer
109 views

Would gravity be stronger or weaker on different sides of a dual planet?

If you had two similar sized planets that were tidally locked to each other, would gravity change depending on whether you were closer to the sister-world? Assuming they were quite close.
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4answers
3k views

How high and far could a person jump in lower gravity?

Specifically, half of Earth's gravity. Let's assume that all other factors are equal to Earth. At a glance, it seems like the answer might simply be "double", but at the same time it seems as though ...
12
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5answers
1k views

Would a spacecrafts artificial gravity give it an atmosphere?

Artificial gravity is a staple concept of science fiction. Not much focus is ever put into explaining it for time and convenience as it would distract the audience from the story. Realistic sci-fi ...
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12answers
2k views

How should we compensate for lack of traction for vehicles on the moon?

We are building a 3D game world that portrays an advanced lunar town that's as technically accurate as possible, for the purpose of people roleplaying living there and learning about space development....
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4answers
600 views

What would stop megafauna from evolving in low gravity planets?

On planets with lower gravity than earth what might make carbon bases megafaun rarer than in our own planet? The planets have a source of geothermic energy, solar energy, winds and oceans. Sometimes ...
23
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7answers
7k views

How big can a moon be where you can physically jump out of its orbit, to its planet?

So, imagine a team of space marines, fighting some sort of space bug zombies on a planet's moon. Things are going pretty bad for them, and the last surviving protagonists are running for their lives. ...
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2answers
87 views

How feasible would aerostat settlements be in my world?

For a while I have been considering adding aerostatic settlements within my world, which would be emblematic of the more advanced civilizations/societies/entities, hosting a number of people ranging ...
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0answers
35 views

What is the highest g planet that can be escaped with current rocketry technology? [duplicate]

A spacefaring race in my story evolved on a high g planet. This made them smaller, stockier and stronger than most other spacefarers. The question is just how high their planet’s gravity could be ...
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2answers
122 views

How big can a (human) habitable planet be while having around x0.7 the surface gravity of earth?

I've been working on the world-building for my setting and I realized I haven't really thought about the implications the lowered gravity I'm working with would have on the size of the planet. ...
19
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7answers
6k views

How does gravity affect evolution of life?

I have two "new" planet earths -- we'll call them Light Earth (LE) and Heavy Earth (HE). These planets are generally the same as our Earth in terms of land masses, oceans, the moon and sun and other ...
3
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3answers
163 views

What would someone who can alter gravitational (but not inertial) mass for a period of time be able to achieve?

A gravity mage is someone intrinsically able to alter the gravitational mass of objects, without affecting their inertial mass. They are able to do so only to objects they touch, and when they change ...
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3answers
161 views

How dense must a light object be in order to significantly bend space-time?

We know that the mass of the sun bends the space time geometry. Collapsed onto an orange-sized sphere it can turn into a black hole. The physicist Tippler has shown that time travel is theoretically ...
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4answers
265 views

The Potential Application of Gravity Manipulation As a Power [closed]

Given that a person is granted the power of manipulating gravity, or namely alter the gravity of any object they touch (including themselves), what would be some potential applications of said power? ...
21
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5answers
25k views

What factors determine a planet's gravity?

In Science Fiction we often see the protagonists exploring all sorts of strange new worlds with no apparent discomfort to the variations in gravity. What factors determine how strong the gravity will ...
33
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16answers
12k views

Can airborne floating/flying islands be scientifically possible?

I'm sure that this has been asked before, but I need floating islands for a fiction story I'm writing. It takes place 5000 years after a catastrophic event (on a vaguely earth-like planet populated ...
0
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1answer
127 views

Would it be possible for supergiants to play football at the normal pace with a moon-sized ball in the right parallel universe? [closed]

Imagine astronomical sized giants in a parallel universe where they could exist. They have moon-sized brains and are about 20 brains high. Their motion, in this universe, would be enormously slow. The ...
5
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1answer
126 views

Could any Earth-based species survive on a supermassive terrestrial planet?

In the far future, a fleet of human settlers arrives in a star system containing an unusual planet; 90 times the mass of Earth, with only 3 times the radius. Rocky planets with similar mass are known ...
12
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5answers
3k views

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 ...
28
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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 ...
5
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1answer
155 views

What would happen if a planet gradually lost mass?

The idea I have is to have a planet that, at its core, has a being that gradually eats away at the planet's substance and converts it into massive amounts of energy (think matter-antimatter ...
2
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2answers
179 views

Can a localized distortion in space time increase or decrease gravity?

Suppose a wild mage appears with a spell that distorts space time, planning to increase gravity in the area. Inside this 2 meter diameter sphere of distorted space, could gravity be higher inside but ...
4
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1answer
141 views

Could a planet about 30% larger than earth but only 80% as dense still support a strong magnetosphere?

I've been trying to work out a few calculations for a planet I am working on and hit a bit of a roadblock. The planet in it's current state is 1.35x the size of Earth, but in order to get a density ...
6
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2answers
615 views

How would a dirty space station with no artificial gravity look?

Just a weird question that popped in my head, but since the only real space station in existence always keeps itself squeaky clean, I wonder how one that doesn't have cleanliness as high priority ...
4
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8answers
536 views

The Source of Gravity Based Destruction

The Background: It's the year 4000 (or whatever), and mankind has cheated FTL travel. As a result of this 'cheating' rather than solving, however, they can't easily go beyond their borders. However,...
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1answer
90 views

Predict The Orbital Eccentricity Of A Planet In A Circumbinary Orbit

Okay, I have a planet smaller than Earth that has a mean orbital radius of .9 AU, and it orbits twin suns. The larger sun has a mass of 1.15 solar masses, and the smaller sun has an mass of .45 solar ...
4
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2answers
264 views

Would less gravity allow for larger flying creatures (like dragons)

From my superficial understanding of physics, it seems that large flying creatures like your typical Western dragon wouldn't be possible on Earth, specifically because they would always be too heavy. ...
2
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1answer
187 views

Defining specific physics for a fictional element (or substance) used for airship lift

On this Earth-like world with three moons and a human society with early-WWI technology and Victorian-like culture, a material known as "Suspendium" propels floating airships to war. This ...
11
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4answers
2k views

What are the requirements for an atmosphere retaining moon with a stable orbit around an Earth-like planet with non-destructive tidal forces?

For story writing purposes I would like a realistic setup where there is a planet with close to earth conditions in terms of gravity, relative position to the sun etc. However I aim to have a much ...

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