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Q&A

Posts tagged gravity

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Q&A How long would a planet that losses its gravity take to break up?

In my setting, one of the fallouts due to interstellar war between civilisations is that a planet's gravity can be removed. This capability is part of the setting's hyperspace mechanics so the exac...

1 answer  ·  posted 2y ago by Dave Driver‭  ·  last activity 2y ago by HDE 226868‭

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Q&A If the Earth would break apart, how likely would the large debris stay in orbit?

In the story I'm writing, Earth gets destroyed and the few million humans that survive go to live on another Earth-like planet. Since the destruction of the planet, the humans do visit their star...

2 answers  ·  posted 2y ago by SKKennell‭  ·  last activity 2y ago by SKKennell‭

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Q&A To carry a person in its palm (like King Kong) how much pressure and at what speed would a kaiju need to apply?

Assume my kaiju is around 200 feet tall, weighs around 4,000 US tonnes and resembles a large lobster with two giant claws for its front legs and long spindly limbs with tiny pincers on the ends for...

2 answers  ·  posted 2y ago by Luke Duffy‭  ·  last activity 2y ago by Luke Duffy‭

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Q&A How long can a human body function at safe levels in slightly higher and lower gravity?

I have a number of alien species from different planets with gravity between 0.5g and 1.75g and I wanted to have groups of each of the species to exist together in a space habitat. As pointed out t...

1 answer  ·  posted 2y ago by RandySavage‭  ·  last activity 2y ago by RandySavage‭

Question biology gravity
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Q&A What percentage of stars would need to become Shkadov thrusters to move the whole galaxy?

The advanced civilization in my story is trying to reach as many galaxies as possible in the next few billions years before the expansion of space has sent those galaxies permanently out of reach w...

1 answer  ·  posted 2y ago by RandySavage‭  ·  last activity 2y ago by RandySavage‭

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Q&A Specific gravity change for my world

Ok, so this is a culmination of a few questions into one final question: am I doing this right? I am trying to figure out the gravitational difference from one end of a continent to another. There ...

0 answers  ·  posted 2y ago by NRJohnson‭

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Q&A What is the tallest mountain possible in any gravitational environment?

In world building it is often interesting to consider extreme landscapes "“ how tall can a mountain be on Earth for example. But what is the tallest mountain possible in any gravitational environme...

2 answers  ·  posted 2y ago by Slarty‭  ·  last activity 2y ago by Slarty‭

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Q&A Could habitable planets form in an ultracompact galaxy?

I am wondering if habitable planets could form around stars in super dense dwarf galaxies. There are some super dense galaxies such as M60-UCD1 and M85-HCC1 which can have a typical distance betwee...

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

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Q&A Roughly how long could an 'Oumuamua type object get?

Roughly how long could an 'Oumuamua type object get if created naturally or if created artificially using fused rock? What would be the limiting factor governing the length of such objects? Oumaum...

2 answers  ·  posted 2y ago by Slarty‭  ·  last activity 2y ago by Slarty‭

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Q&A Would a life-bearing Earth-like world with 3g average gravity produce more or fewer flying creatures than Earth?

On one hand, heavier gravity would make flying more difficult, owing to greater weight restrictions on the flying creatures' bodies. On the other hand, the greater density of the atmosphere on ...

2 answers  ·  posted 2y ago by James Grossmann‭  ·  last activity 2y ago by James Grossmann‭

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Q&A How large could sea creatures grow on a terraformed Ganymede?

If we assume a terraformed Ganymede has a global ocean roughly 800km deep, that food is bountiful, and that it has been populated by a variety of life from Earth, how large could these creatures gr...

1 answer  ·  posted 2y ago by Wax‭  ·  last activity 2y ago by Wax‭

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Q&A I need a spacecraft to be pulled into the sun's gravity!

So, as I understand it, the spacecraft would need to move in the opposite direction to the orbit. Are there any calculations I could make to attach a clicking-tock onto this? If the spacecraft were...

2 answers  ·  posted 2y ago by zengun309‭  ·  last activity 2y ago by zengun309‭

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Q&A What is the minimum and maximum gravity level that nearly all humans can sustain over a 5 year period?

There are several questions related to effects of different gravity levels on the human body, but none adequately answer a fundamental question: What is the maximum and minimum gravity that nearly ...

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

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Q&A High Mountains in High Gravity

What would cause/allow a planet with very high gravity to have tall, sharp mountains? Mountain height is generally capped off by gravity, erosion, and the mountains composition. On a higher gravit...

2 answers  ·  posted 2y ago by Aezyc‭  ·  last activity 2y ago by Aezyc‭

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Q&A The One Problem With Terraforming and Colonizing a Super-Earth

Many people are excited with the idea of super-Earths--rocky, habitable exoplanets greater in mass, density and diameter (because I'd prefer to go the whole way than stop at the halfway point) than...

3 answers  ·  posted 3y ago by JohnWDailey‭  ·  last activity 3y ago by JohnWDailey‭

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Q&A Is it believable to have a spaceship spin around a weight for artificial gravity?

In my narrative universe, there will be ships that use a 1g acceleration for artificial gravity. However, when they are not accelerating (whether on a longer journey at a constant velocity or simpl...

3 answers  ·  posted 3y ago by user72655‭  ·  last activity 3y ago by user72655‭

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Q&A Schwarzschild Metric in a universe with the same space time metric as that described in the orthogonal series, but with massive gravitons?

The universe described in the orthogonal series http://www.gregegan.net/ORTHOGONAL/00/PM.html is one, in which the minus sign in the space time interval is replaced with a plus sign. So this unive...

1 answer  ·  posted 3y ago by Anders Gustafson‭  ·  last activity 3y ago by Anders Gustafson‭

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Q&A Gravity in a lunar base

Imagine a big Moon base situated under a dome. Big means under the dome there is a small city with buildings, streets and ca. 30,000 inhabitants. The best analogue in the movies would be the Ceres ...

3 answers  ·  posted 3y ago by Maxim Zabolotskikh‭  ·  last activity 3y ago by Maxim Zabolotskikh‭

Question moons gravity
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Q&A How would a bird's flight change entering the zero gravity axis of an O'neil cylinder?

This question on space stack begins to tackle how a bird could fly inside an O'Neill cylinder, https://space.stackexchange.com/questions/27665/can-birds-fly-inside-an-oneill-cylinder. Here is the ...

1 answer  ·  posted 3y ago by RandySavage‭  ·  last activity 3y ago by RandySavage‭

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Q&A Would trams be workable on a low-gravity world?

After reading this thread from a bit under a year and a half ago about the most cost-effective means of travel on Mars, where one of the answers mentions rail as the best option, I started wonderin...

8 answers  ·  posted 4y ago by Sean‭  ·  last activity 3y ago by Sean‭

Question gravity vehicles
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Q&A Gravity/Ecosystem on a peanut-shaped planet?

I'm interested about whether or not and how gravity would be affected on deformed planets. You could think of this as whether or not mega-asteroids would be able to sustain life? If so, would diffe...

2 answers  ·  posted 5y ago by DiagonalCorgi‭  ·  last activity 3y ago by DiagonalCorgi‭

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Q&A 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...

3 answers  ·  posted 3y ago by Sean Kindle‭  ·  last activity 3y ago by Sean Kindle‭

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Q&A Higher Gravity vs Higher Air Density

Planets that are larger and have higher gravity tend to have thicker atmospheres, since it is easier to hold onto gases. Higher air pressure leads to a higher air density, and therefore, a greater...

5 answers  ·  posted 3y ago by Aezyc‭  ·  last activity 3y ago by Aezyc‭

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Q&A Would the human body support living on planets with a greater gravity than Earth?

I once read a novel about a prison-planet which was chosen to make the prisoners suffer. One of the different "tortures" was a gravity three times higher than that on Earth. Would the human body s...

14 answers  ·  posted 8y ago by Garoal‭  ·  last activity 3y ago by Garoal‭

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Q&A Asteroid in the asteroid belt suddenly gains the gravity of the earth

An entrepreneur has a dream. He wants to create the most amazing and magical amusement park in the solar system. He goes to investors with the blue prints of the park, and they think it's a good id...

4 answers  ·  posted 3y ago by William Oliver‭  ·  last activity 3y ago by William Oliver‭

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Q&A How could an Earth-like planet support all-metal airships?

When I say all-metal airships, I'm referring to something like the above from Jakub Rozalski's artwork - the design is more akin to a naval destroyer or battleship and less like a zeppelin. We'v...

6 answers  ·  posted 3y ago by Vigilant‭  ·  last activity 3y ago by Vigilant‭

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Q&A Would an anti-gravity organ allow kaiju to avoid cube-square problems?

It is (around here, anyway) quite well known that science does not allow the existence of kaiju, mainly because of the cube-square law. bones rip themselves out To my understanding, this boils do...

4 answers  ·  posted 3y ago by Mark Gardner‭  ·  last activity 3y ago by Mark Gardner‭

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Q&A What would gravity, breath, and human bodies be like near the heart of the Earth?

If humans lived on the inside of the earth's crust, what would happen if they climbed mountains? These mountains would stretch toward the burning center of the Earth. Would gravity get stronger the...

2 answers  ·  posted 3y ago by System‭  ·  last activity 3y ago by System‭

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Q&A Low gravity space shipyard vs micro gravity shipyard

If you had a device, similar to a Stargate, but that allowed seamless two way transfer, and that could be moved (You could essentially strap a rocket on it, and fuel it from Earth), you could just ...

3 answers  ·  posted 3y ago by MartinArrJay‭  ·  last activity 3y ago by MartinArrJay‭

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Q&A 1 Light Year Diameter Planet

Suppose a species has limitless resources and the ability to construct megastructures of an astronomical scale. Would it be possible, given antigravitational technology (hypothetical), to create a...

14 answers  ·  posted 6y ago by Kcronix‭  ·  last activity 3y ago by Kcronix‭

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Q&A How many pillows would you need to survive a fall from a church tower?

The praised Dutch book "Koning van Katoren" features an 18 year old who wants to become king of his country of Katoren, which had been under the regency of half a dozen evil ministers for his whole...

10 answers  ·  posted 3y ago by KeizerHarm‭  ·  last activity 3y ago by KeizerHarm‭

Question physics gravity
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Q&A What would the problems with / consequences of a torus shaped planet be?

Take a torus planet: It has the structure of a normal planet (ours): The diagram is not to scale. Assume similar proportions of Crust:Mantle:Cores as the Earth. Is has a similar volume (close...

5 answers  ·  posted 8y ago by Tim‭  ·  last activity 3y ago by Tim‭

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Q&A Would humanoids from high gravity planets be smaller than us?

The usual characterization of humanoids from high gravity planet is that they are stockier with thicker bones and larger muscles and this assumption isn't far fetched. Heavy animals on earth have ...

2 answers  ·  posted 6y ago by Green‭  ·  last activity 3y ago by Green‭

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Q&A Spin gravity on an abandoned ship

If a cylindrical rocket ship with a diameter of about 350 meters were spinning on its long axis, would more than just the interior surface of the outer hull have artificial gravity? The ships dec...

1 answer  ·  posted 3y ago by carsonogen089‭  ·  last activity 3y ago by carsonogen089‭

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Q&A Under which circumstances could a planet have two visible suns?

In the story I'm making, it is important that there are two suns in the sky, going at different rythms (maybe the planet orbits one of them each year, and the other each four years, for instance), ...

1 answer  ·  posted 3y ago by Iván Flores Vázquez‭  ·  last activity 3y ago by Iván Flores Vázquez‭

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Q&A How fast do we spin this for 'One g'

Following on from this question. Question Context : Mars second moon Deimos has been converted into a generation ship. A considerable portion of its mass has been shaved off during the process &...

1 answer  ·  posted 3y ago by Pelinore‭  ·  last activity 3y ago by Pelinore‭

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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 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A Mega fauna and flora on a super earth

I am working on a super-earth, about 1.5 more massive than Earth. On this planet, there's a large variety of megafauna and flora across the world. The biggest trees over there can grow to be 36 met...

1 answer  ·  posted 3y ago by Johnara‭  ·  last activity 3y ago by Johnara‭

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Q&A Sniper team from different G-Worlds

The metric system (SI units) is a base-10 measurement system based on the meter, kilogram and second. But it is tied to earth. A second, which historically was defined as 1/86,400 of a day, now d...

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

Question planets gravity
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Q&A Freedom from the tyranny of gravity

So I've been browsing Worldbuilding for a while now and the answer to so many questions seems to be "No, gravity doesn't allow it". Gravity (and the square-cube law, but as I understand the proble...

4 answers  ·  posted 5y ago by adaliabooks‭  ·  last activity 3y ago by adaliabooks‭

Question gravity
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Q&A Using Magnet Technology to Make a Rotating Space Station?

For an artificial gravity ring station, could you make a central hub, using similar magnet technology used to levitate magnet trains here on earth, to reduce the amount of mass rotating? My thought...

4 answers  ·  posted 3y ago by Greenie E. - Reinstate Monica‭  ·  last activity 3y ago by Greenie E. - Reinstate Monica‭

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Q&A How large can differences in gravity be without being overly dangerous to humans?

Let's imagine a planet that is 5000 km in diameter but has the mass of the Earth. I'd imagine standing on that planet might feel similar to standing on the Earth, because the gravity would be compa...

1 answer  ·  posted 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A Large flying creature on super earth?

I am working on a habitable planet that orbits around a red dwarf star and it is about 1.5 times bigger and more massive than the Earth. Gravity there is stronger and the atmosphere is thicker. No...

3 answers  ·  posted 3y ago by Johnara‭  ·  last activity 3y ago by Johnara‭

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Q&A Is a "Partial" Black-Hole Possible?

Black holes are created by the gravitational collapse of massive stars. But in theory, black holes can also be created by any mass at all that is confined within a small enough volume of space, de...

4 answers  ·  posted 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A Using spin gravity only for stationary activities?

For a spacecraft cruising without thrust it is my understanding that the sort of spin gravity utilized in the film 2001, for instance, would actually be debilitating to the crew due to the coriolis...

2 answers  ·  posted 3y ago by Duke Leto‭  ·  last activity 3y ago by Duke Leto‭

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Q&A Would a flying, human sized species from a planet smaller than Earth be stronger, as strong or weaker than humans?

I'm working on a sci fi story where one of the species has batlike wings and comes from a moon around the size of Titan with roughly the same atmospheric pressure as Earth. Initially, I thought the...

2 answers  ·  posted 3y ago by Wayward Astronaut‭  ·  last activity 3y ago by Wayward Astronaut‭

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Q&A Could this method of moving planets work?

In my last question about methods of deflecting a rogue planet, there was a fascinating answer from Willk. Willk basically suggested that if you knew the location, mass and velocity of objects in ...

6 answers  ·  posted 3y ago by Wiggo the Wookie‭  ·  last activity 3y ago by Wiggo the Wookie‭

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Q&A What effects would a higher gravity have on my world's geography and climate?

I'm currently designing a super earth with a surface gravity of 1.5g and a thick oxygen rich atmosphere. Now since the gravity is higher, how exactly would that affect my world? For example: Geogr...

1 answer  ·  posted 3y ago by Johnara‭  ·  last activity 3y ago by Johnara‭

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Q&A Could we move a gas giant by venting its gas?

Could humanity move a planet such as Jupiter by forcing it to vent its gas? Assuming we have the technology to do huge mining operations and use these to make some of Jupiter's moons into a huge t...

2 answers  ·  posted 3y ago by meaninglessname‭  ·  last activity 3y ago by meaninglessname‭

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Q&A 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 f...

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

Question gravity