# Questions tagged [gravity]

Questions regarding the attractive force present between two masses. If about research in artificial gravity (i.e. manmade substitutes for gravity), please use the artificial-gravity tag.

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144 views

### Speed of Gravity [closed]

Is the speed of gravity instant? By the speed of gravity, I'm not talking about acceleration. What I mean is something like this: If I take a vacuum, for example, and put in two objects of the same ...
220 views

### Synthesizing gravity

There are substances with such massive density that a relatively small volume, could contain an immense mass. Given a substance like neutronium, could you conceivably synthesize gravity for a space ...
889 views

### What Gravity does the Sun affect items with at the distance of 1 AU?

At the surface of the Earth, the force of gravity is defined as 1 G. I am wondering what gravitational force the sun excerts at the distance of 1 AU (the distance Earth is at). Imagine it like this; ...
432 views

### What's considered the boundary for “earth orbit?” [closed]

According to this CNET article, The last time a human broke free from Earth's orbit was the Apollo 17 mission in 1972. I thought that the moon orbited the Earth, and that visits to it were still ...
13k views

### Could we build a spaceship like the ones you see in Sci-Fi movies with current technology? [closed]

With our current technology could we build a spaceship like the ones you see in Sci-Fi movies (Enterprise in Star Trek or Star Destroyer in Star Wars)? Could self-gravitation be a problem? I would ...
114 views

### Two spaceships fly straight, parallel to each other, tied to each other by a rope, and pass a black hole between them. What happens to the rope? [closed]

To elaborate more on what I mean: Two spaceships are flying parallel to each other, both going completely straight relative to the observer. Their distances between each other do not change, as the ...
77 views

### If a spaceship were to lose all fuel, where does it go? [duplicate]

If a spaceship were to run out of fuel mid-flight, and it was between two solar systems, one with 2 suns and 6 planets, and one with 1 star and 10 planets, where does it go? I feel like I’m missing ...
592 views

### How can a body experience weightlessness or micro gravity on the ground? [closed]

I was thinking how to have a situation on Earth of feeling weightlessness for an indefinite time, not for a few minutes like on a diving plane Not reduced gravity, weightlessness as I feel in a ...
113 views

### How large would a alien spaceship have to be to affect the earths gravitational orbit? [duplicate]

Would a large enough ship generate enough gravity to affect earths course?
118 views

### Is there a table of the gravitational pull of a spacecraft? [duplicate]

I would like to put a spin on What is the maximum mass of a satellite that can be placed in GEO? Gravity is a function of the mass of both (all) bodies, and their relative separation. Wikipedia lists ...
72 views

### Archimedes Principle on other planet [closed]

How does the Archimedes Principle work on other planets where the gravity is different.? Does the wood block will float exactly same in water tub on different planets as on Earth.?
150 views

### What orbit is this?

Can this orbit exist around the Earth and the Moon if the weight and speed of the satellite is ideal? I have added a picture below with the orbit drawn.
763 views

### How could the gravitational pull of a comet affect spacecraft and astronauts landing on it?

When I researched the gravity on comets like on 67P/Churyumov-Gerasimenko's surface I found that it was several hundred thousand times weaker than on Earth source: www.esa.int/Our_Activities/...
179 views

### What could possibly happen if an object accelerates 9.81 m/s^2 upwards if it started from the ground ? [closed]

Will the acceleration of the object and the acceleration due to gravity cancel each other and that object remains at the same space coordinate?
100 views

### Gravitational forces affecting acceleration on a space ship with artificial gravity [closed]

I and my brother are having an argument on gravity on a space ship. For this argument lets say, you are in a void. There are no outside gravity forces, ie planets or solar systems in the near region. ...
86 views

### My vector math seems to be off in this 2D simulation of a solar system

I intend to simulate gravitational acceleration on a 2D plane (simplified, no gravitational constant). My code is interpreted without any error in the console, but instead of having the two circles ...
629 views

### How are fuel requirements different for different types of orbits?

In theory, the orbit around a single mass always has the same amount of total energy (Kinetic + Potential). Therefore, if a satellite was launched from earth, it should always require the same amount ...
167 views

### What ways can we get around the effects of microgravity? [closed]

One of the main factors limiting manned space exploration is the effects of living in zero-gravity on a long term basis. Aside from planting a big lump of rock beneath a starship or using a centrifuge ...
501 views

### Considering the relativity of time, how is time experienced in deep space? [closed]

To be more specific, if the relativity of time is governed by the mass and gravity of objects (I.E the satellites orbiting earth experience minor time dilation compared to us on the ground), how is it ...
194 views

### Multi level Gravity Wheel [closed]

If you had a space structure in the form of a disk shape. Inside it would have rooms and hall ways connecting the rooms. Each hall is a continues ring so if you walk in one direction in a hall you ...
30 views

### If I know the masses, positions, and velocities of two objects, how do I calculate their trajectories under gravity?

I was thinking about the effect of a near-miss with an asteroid upon the orbit of the earth around the Sun. My goal is to figure out a formula I could use for a visualization I'd like to build to get ...
99 views

### How much does it cost to land on a lunar mascon?

This answer to Delta-v for landing on the moon estimates that to go from a circular orbit at 110km to a landing on a spherical Moon would require an absolute minimum of 1736 m/s and the Apollo landers ...
114 views

### Are there clusters of small asteroids in the Kuiper or asteroid belt which could threaten the Earth?

I watched an episode of Curious Droid talking about the types of impacts of asteroids the size of Near Earth Objects. Are there clusters of small asteroids which are gravitationally bound together (or ...
139 views

### A Space Gravitational Bus Route - is there such a thing? [closed]

Don't know if this is already been thought of, if it has it would be cool to know the name? Fundamental problem in how the public sees space transport, the problem is we see it as firing a rocking ...
52 views

### Asteroid belt to earth orbit [closed]

Given a constant 1g acceleration with a reaction-less drive how long would it take to achieve zero-zero in earth orbit from the asteroid belt?
113 views

### Help with Vector format N-body state transition matrix

[Update] This is for an on-board autonomous navigation system (3-dimensions, interplanetary) using a Kalman Filter. There is no target trajectory. I have the position and velocity measurement models ...
86 views

### Can an Asteriod be marshalled as a spacecraft providing sufficent earth like gravity for those on it [closed]

Can a sufficient massed and size asteroid in a safe area from earth have engines added and provide earthlike gravity for occupants to bring them reasonably close to planets and earth for supply and ...