Posts tagged gravity
Let's say there's a planet with 18 times the radius of Earth, but has the same density as Earth. If so, how would it be possible for a big planet to such a density of Earth? Would it have the same ...
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...
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 tha...
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 even...
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?
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 p...
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 gen...
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 ...
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 rea...
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 ef...
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 w...
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 flappin...
I've been toying with an idea of a epic space fantasy where a certain area of the milky way is controlled by decedents of humanity that are born, live & die in spaceships, said "ngees" as the "...
Consider: A spacecraft is travelling between planets. It accelerates at a constant rate for the first half of the trip, and then decelerates on the other half. Throughout the journey, aside from ...
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 th...
If the entire Earth's gravity immediately shifted so it was pulling from East to West, what should people do? Keep in mind that this is not reversed, but merely tilted sideways, and maybe at an an...
One premise of my current planet-in-progress is that certain locations in the universe are inherently tied to my PIP. For example, all the people and things that have vanished in the Bermuda Triang...
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 specie...
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 thou...
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 t...
The normal condition of life in a planet (Earth right now) is that below us is the planet's core, and above us is the sky. Now if there's a hollow planet like above, is that possible? How does ...
A planet with changing gravity On earth gravity stays constant (besides negligible fluctuations), but it may be possible to change that. What kind of geology, natural satellite, or other anomaly c...
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 a...
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 scenari...
In the near future, an alien race finds Earth, learns how it and everything on it works, and begins to tamper with it. Somehow they figure out a way to flip the pull of Earth's gravity on only huma...
Imagine a world that spun just fast enough (and had a strange enough composition to hold itself together as a spinning sphere) to create an outward, centrifugal force which was as strong as its gra...
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 ti...
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 ca...
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 l...
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...
If a circular structure could be built that would wrap around the entire earth, but was of a larger radius, would it 'float' above the earths surface or would it somehow fall onto the surface at so...
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 co...
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 com...
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 t...
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 o...
Our knowledge of exoplanets is changing all the time, but based on observations so far, is it possible to estimate the number of planets in a galaxy the size of our own that would have an Earth-Lik...
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? Backgrou...
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 whic...
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 ...
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. T...
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 det...
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...
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 retain...
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...
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 pro...
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 b...
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 she...
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 thre...
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...
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 v...
