# Tag Info

Accepted

### Industrial applications of high gravity

Frame Challenge: Setting realistic expectations It is not possible for any astral body to have a surface gravity of 700g. The highest theoretical surface gravity of any rocky or icy planet is about 3....
• 95.8k

### Would Artificial Gravity With Short Range Be Possible?

If your fiction needs it, make it so. Such artificial gravity works perfectly well in Star Trek, Star Wars, Battlestar Galactica, etc. ad nauseum. No-one needs to explain how it works (nor can they ...
• 22.4k
Accepted

### Is it possible to store the gravitational energy between planets somewhere in space?

OK, the question is formulated a little bit loosely, so let's try to understand the implications of what you are asking. I will focus solely on extracting gravitational potential energy from the sun-...
• 1,377

### Decaying Planets

I'm not going to go over why this would be impractical - I'm just assuming, like you are, that it's happening. The actual answer is: it depends. This is maybe the most common image in this site: Put ...

### Would Artificial Gravity With Short Range Be Possible?

Newton's law of gravitation states the force that exists between two masses is based upon the magnitude of those two masses and the distance between them. The force is inversely proportional to the ...
• 61.9k
Accepted

### Would Artificial Gravity With Short Range Be Possible?

It would be conceivable, which is the important part. You are hypothesizing a new development in scientific knowledge. A simple way would be to introduce a rule that the effect is only short-range. ...
• 29k

### Would Artificial Gravity With Short Range Be Possible?

There is no modern day Physics-based answer to this question By definition, artificial gravity does not work in the same way as the one, and only one, way we know to create gravity - having mass. ...
• 7,507

### Industrial applications of high gravity

There is a somewhat frame-challengish answer here - depending on how broadly you define industrial... Training of Soldiers Especially if those people are born and raised in the higher gravity ...
• 28.6k

### How do these trees not collapse?

Heated hydrogen gas Your bulb has a major flaw. If it pops, it'll not automatically vent it's seeds to the environment. Think of a balloon filled to bursting with marbles. Sure it'll burst, but none ...
• 37.4k

### Decaying Planets

No size. A gas made out of rock stuff has more energy than a rock, not less, so if your space bugs are eating rocks and making gas, they're doing it to cool down, not to fuel their metabolisms, and it'...
• 7,499

### Is there a reason for Rocket-style vertical takeoff craft when you don't need to bring reaction mass?

What would make vertical takeoffs and landings preferred over horizontal spaceplane-style takeoffs and landings? Your engines are very strong and very efficient. That's really all it takes. ...
• 5,534

### Radioactive planet wrecks civilisations every 5 millennia- How stable will it be?

With a surface area of 144 million square kilometres and an energy output of 3.2 x 10^20 watts, this is over two megawatts of power per square metre. However, temperature is a fourth-power property ...
• 61.9k
Accepted

### What would life be like in a universe with gravity that increases with distance?

Nonexistent. Uniform distribution of mass is a stable equilibrium for such a system and there are no equilibria which are not uniformly distributed. Therefore stars never form. Consider a toy model: a ...
• 7,499

### Pulsed Acceleration Gravity

What I’m hearing (correct me if I’m wrong) is that you want artificial gravity for long-term space voyages so that your astronaut’s bones stay intact. Generally a good thing. Here’s the thing: if your ...
• 4,906
Accepted

### How viable are Airborne Aircraft Carriers on my alien world?

The classic solution for this problem (since the 1950s, though it could have been done by 1940 if it had been needed, with a probe and drogue system like everyone other than the USAF uses) is in ...
• 45.9k

### Industrial applications of high gravity

ErikHall's answer calculates that the density of Mesklin should be about 19.702 grams per cubic centimeter. And many have said how improbable a world with such a density would be. As a matter of fact, ...
• 30.3k

### How much mass could be added around the Earth before the Earth's orbit around the sun changed?

This is a matter of two-body orbital mechanics. $$T=2\pi\sqrt{\frac{a^3}{G(M_1+M_2+M_3)}}$$ where: $T$ = orbit time $G$ = Gravitational Constant (6.6743E-11) $a$ = Semi Major Axis (1.49598023E11) \$...
• 61.9k
Accepted

### Can a cube-shaped(ish) world have uniform(ish) gravity when composed of ideal materials, including antimass?

I suspect the answer is yes (for a rounded-edge cube), no anti-mass required, but it is in fact a surprisingly difficult calculation to deal with. You can search up questions about the gravitational ...

### Would Artificial Gravity With Short Range Be Possible?

If the spacecraft used rotation as a means of generating artificial gravity then the space craft need not be that massive nor have any significant gravitational field but those aboard would still be ...
• 37.6k

### Using gravity and the Higgs Field as an inertial damper

There is a lot here. In Relativity, the OG paper, Einstein proposes two primary tests under Appendix 3. These being the motion of mercury´s perihelion and the deflection of light around massive ...
• 2,481

### Industrial applications of high gravity

Leaving aside what prevents such a planet from instantly imploding into a very small black hole. . . Let me do some math... So Mesklin is said to have a Polar diameter of 31770 km and a equatorial ...
• 2,481

### How to create a network of stable traversable wormholes, how those WH behave when interacting with gravity and vessels, and how they look

What I want to achieve: I appreciate the afford, but there are fundamental problems. Negative Energy is explicitly forbidden in General Relativity for complex reasons. Even outside of Relativity, ...
• 2,481

• 6,788
Accepted

### Decaying Planets

If your planet has very light elements combined into compounds that are much heavier, and if the rocks of the planet contain a lot of those compounds containing lighter elements, then the rock eating ...
• 30.3k

### Can a tidally locked planet with two counter-orbit moons exist for at least 100,000 years?

So, obviously this depends a lot on the initial conditions. For simplicity, lets assume the ideal case of two moons, one half as massive as the other, on circular orbits around a central body. Like ...
• 2,481

### Pulsed Acceleration Gravity

It's extremely unpractical... You are probably neglecting that the astronauts will not dilly dally while being shaken up and down at high frequency, but if they are there they are supposed to be doing ...
• 291k

### How viable are Airborne Aircraft Carriers on my alien world?

The Russian's answer to this problem in the 1960's was to make a long-range fighter aircraft: the Tupolev Tu-28. They had a 5000 Km front to defend, mostly over barely inhabited territory, so ...
• 9,834

### Earth sized object with negative mass superimposed 1:1 on Earth. What happens to its orbit?

Negative mass behaves differently to normal, positive mass. Positive mass attracts other masses, while negative mass repels other masses. If the positive mass earth (Earth+) and the superimposed ...
• 61.9k