Questions tagged [artificial-gravity]

Artificial gravity is the varying (increase or decrease) of apparent gravity via artificial means, particularly in space, but also on Earth.

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48
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14answers
21k views

Why are there no spacecraft rotating for artificial gravity?

Spacecraft rotating to generate artificial gravity through "centrifugal force" are commonplace in science fiction but not in reality. Considering the problems in long missions (among others: bone loss,...
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1answer
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What would the size and rotation of a station need to be to produce 1g gravity from head to toe?

A structure with a radius of 224m rotating at 2 rotations per minute will generate 1g of force on the inside (spincalc). It will generate that force on the feet, but as you travel up the body the ...
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4answers
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Why can't spaceships just accelerate to create gravity?

The answer to What happens to an astronaut who's floating in a spaceship (in space) when it begins to move? is that we can create g-force just by accelerating. So then why go all the way to create ...
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5answers
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How can you make a vacuum proof rotatable seal?

Many systems have been discussed where you have a rotating spacecraft for artificial gravity purposes, with a portion of the spacecraft that doesn't rotate, perhaps the engine for instance. I've been ...
24
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0answers
8k views

Why is artificial gravity not included on space stations? [duplicate]

I'm wondering why artificial gravity is not included on the ISS, or on the currently planned OPSEK. There are long-term health effects of weightlessness, which would be avoided, using artificial ...
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3answers
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Qualitative differences between gravity and a spinning habitat

I'm aware that living in a spinning habitat has a couple of noticeable differences from being on terra firma. For instance, running in the direction of the spin ought to make you feel heavier, while ...
22
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4answers
5k views

Would a ball bounced in a centrifuge return to the floor?

In other words, does the centrifugal force inside a centrifuge only work to simulate gravity when an object is "attached" to the reference frame inside the centrifuge? 1G at sea level is normally ...
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3answers
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Is artificial gravity feasible in manned long-term space exploration?

We know that it is possible for humans to stay physically in shape during long term space missions (see for example Valeri Polyakov who stayed on Mir for more than 14 months for one trip). However, ...
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4answers
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How does centripetal force produce artificial gravity

I think I lack a fundamental knowledge of physics to answer this myself. In many sci-fi stories, there is a rotating spaceship that gives the feeling of being pulled "downwards" against the sides of a ...
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4answers
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What stability issues plague long artificial gravity cylinders?

The Kalpana One presents itself as a practical modern design for a space station with artificial gravity. One of the tweaks that it made was to limit the length to diameter ratio. This leaves it ...
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5answers
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Besides health benefits, what are the advantages of including inertial gravity sections on spaceships?

Obviously, the benefits of building ring sections on spacecraft are pretty large when you factor in the detrimental effects prolonged stays in zero gravity environments (not accounting for radiation ...
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1answer
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Artificial Gravity on board the ISS and its derivatives

Was the implementation of artificial gravity ever seriously considered for use on board the ISS and its derivatives? If not, why?
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2answers
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Was the Space Shuttle ever rotated to induce artificial gravity?

The Space Shuttle was a fairly compact transportation vehicle in terms of the amount of space available for astronauts to move around. Did they ever attempt to roll a Space Shuttle to induce ...
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3answers
1k views

How would a drone work in centrifugal force generated “gravity”?

How would a hovering aircraft such as a drone operate on a rotating spacecraft that creates artificial gravity using centrifugal force? For simplicity, assume it's a drone on a space colony, similar ...
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2answers
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Mitigating nausea when generating artificial gravity by centrifuge

When utilizing "artificial gravity" generated through a rotating structure using centripetal force, i.e. a centrifuge, is there a minimum diameter or some other attribute that causes or helps ...
10
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1answer
238 views

Have there been any studies on the health impacts of prolonged high G?

If you are flying to Mars or elsewhere, and you want to use a centrifuge to 'make 1G' to keep the passengers healthy, why not increase it (slowly) so they are actually at 2G's? Seems like this would ...
10
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1answer
325 views

How much acceleration does it take for water to flow downhill?

Assume a hab in outer space with 1 atmosphere pressure and 23ºC (comfortable room temperature), To simulate gravity, the hab is spun. Acceleration is $\omega^2r$ where $\omega$ is angular velocity in ...
10
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1answer
695 views

Radial variation of atmospheric pressure in rotating O'Neill cylinder-like ship? (Rendezvous with Rama)

Sir Arthur C. Clarke was a science writer as well as a prolific writer of science fiction (including hard SF*), and his stories usually had a substantial footing in science. His book Rendezvous with ...
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1answer
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Alternatives to centripetal force and constant acceleration to simulate Earth-like gravity

This is follow-up to @Erik's answer to the question Is artificial gravity feasible in manned long-term space exploration? I'm curious, whether there's any alternative methods to simulating effects of ...
10
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1answer
920 views

Can humans play basketball in simulated gravity?

Rotating a spacecraft to create a simulated 1 g should cure most medical problems with microgravity. But can one play ball? A rotating spacecraft with several 10s or 100 meter to the center of ...
9
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3answers
4k views

Is is possible to generate centrifugal gravity by doing donuts?

With the correct rocket setup would it be possible to thrust around in a circle, like you would do donuts in a car, to generate centrifugal gravity?
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2answers
868 views

Would a rotating spacecraft disorient those looking out of it?

I'm curious, if a space station were rotating to produce a gravity-like force, would being able to see large portions of the sky disorient human beings? Is there any research on the maximum rotation ...
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2answers
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Folding structures in space - What are the potential benefits and problems?

I wonder what the most important potentials and problems are with folding out structures in space. The basic idea is to achieve large structures in space while reducing launch mass and launch volume, ...
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1answer
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Can birds fly inside an O'Neill cylinder?

We know that birds can fly in a weightless environment from experiments with pigeons on the Vomit Comet. But on a very large O'Neill cylinder space station, could they fly the same way they do on ...
8
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2answers
656 views

What do ISS astronauts do while the ISS gets reboosted? [duplicate]

For its orbit to not decay, the ISS reboosts itself to higher altitudes once in a while. During the reboost, I wonder how much gravity is felt by the astronauts onboard, and what do they do to avoid ...
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6answers
511 views

What would a physically correct term be for “artificial gravity by rotation”?

Microgravity causes some health concerns in the long run, so it has been proposed that one could create what is often called "artificial gravity" by rotating the space station. This is not strictly ...
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2answers
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How much gravity is actually needed to avoid serious health consequences?

Most discussion I have read about using tethers and rotation in order to simulate gravity on spacecraft, talk about simulating Earth's gravity - 1g or 9.8m/s^2. Baked into the 1g figure is the ...
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3answers
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Why is tethered artificial gravity hardly ever considered?

When you ask about rotating artificial gravity (yes, yes, technically radial acceleration), most answers boil down to "you'd need a 200m diameter spacecraft, and we can't build that yet" But, of ...
7
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2answers
1k views

Is it possible to create artificial gravity in a habitat in space, or on another planet or moon without spinning the hull of the habitat

I've seen many designs for creating artificial gravity within a habitat in space by rotating the habitat about a central axis. With today's science, can artificial gravity be generated in a vehicle, ...
7
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1answer
184 views

How might artificial gravity experiments be conducted to determine adaptation in mice?

Astronauts in microgravity for extended periods experience a number of maladaptations, including bone loss, muscle atrophy and muscle mass loss, redistribution of fluids, and reduction in immune ...
7
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1answer
176 views

Would air circulate in a rotating station on its own?

I know air circulation was a tricky problem on the ISS . I think that in a rotating station the air would be moving with the station, but the air against the “floor” would be moving faster or have ...
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5answers
572 views

Could an aircraft ever simulate Martian gravity perpendicular to the aircraft's floor?

Suppose I designed a complex, self-contained, robotic system to harvest and convert Martian atmospheric CO2 and ground H2O into rocket fuel (CH4 + O2) and after exhaustive computational fluid dynamic (...
6
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2answers
377 views

Would centrifugal force simulate gravity for fish?

We know that in zero gravity; you can simulate gravity with centrifugal force. This works great for people, but if you had fish in a body of water, would the fish be subject to simulated gravity?
6
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3answers
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Creating your own artificial gravity by running. (Part 1 - the basic idea)

The main motivation for artificial gravity is the astronauts' health Usually artificial gravity is supposed to work by rotating the spacecraft. See diagram A. Wouldn't it be much simpler to simply ...
6
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1answer
1k views

Artificial gravity on Mars

It is well-known that the lack of gravity during spaceflight is a cause to many sorts of health issues. It is thus expected that Martian gravity (significantly lower than Earth's) will have influence ...
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2answers
2k views

How would a centrifuge module's berthing system work on the ISS?

Although it's not very likely to be built, the idea of a centrifuge module attached to the International Space Station is taken seriously, and at least two have been proposed. I have in mind the ...
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2answers
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Why do space settlement designers use tori instead of cylinders for space settlements?

Almost all space settlement designs featuring artificial gravity by centrifugal force use the inner side of the outer part of the torus: Why is it that I see hardly any cylindrical-shaped artificial ...
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2answers
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What is the gravity inside a rotating cylinder?

There is the popular question “What is the gravity at the center of the Earth?”. And the answer is zero, because the forces cancel out. And then the gravity increases linearly as you move to the ...
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1answer
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How could a spacecraft be continuously propelled if it rotates to simulate gravity (by tether)?

For long term crewed space travel, gravity might be simulated by rotating a habitat in a long tether to a counter weight. Conventional chemical rocket engines give a spacecraft a brief initial impulse....
5
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1answer
816 views

In what way is artificial gravity expected to avoid/reduce bone loss?

It's my perception that discussions of the use of artificial gravity for manned deep-space travel missions are primarily centered on avoiding bone loss. Am I right so far? Microgravity seems to be ...
5
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2answers
171 views

EVA on rotating spacecraft - differences from microgravity

What would an extra-vehicular activity (EVA) be like on a spacecraft which consists of modules along a (100s of meters long) rotating tether that causes simulated gravity? See for example these slides ...
5
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1answer
168 views

Have any mammals been exposed to micogravity longer than humans?

There are mice on ISS. Not the first non-human mammals and likely not the last. Their health provides insights on influence of microgravity on organisms. Very few humans stayed in space for longer ...
5
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2answers
743 views

Could the BFR Tanker be used as an artificial gravity counterweight for interplanetary travel?

An alternative storyline to the Mars transport architecture: Tankers refuel starship, last Tanker gets mounted on the Starship for the Mars orbital injection burn, once on a Martian trajectory tanker ...
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0answers
68 views

Variable Gravity, how long in each?

Centrifugal force can be used to simulate gravity in space vehicles. Assume the "gravity" in our space vehicle can provide environments ranging from 2 gravities to none (micro), either by changing ...
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0answers
106 views

Would Bigelow space stations work if rotated to achieve 1G simulated gravity?

Would Bigelow's proposed space stations work if two of them are connected by a tether and rotated to simulate gravity of 1G (or how much)? Would they hold up structurally? Would there be other ...
4
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3answers
276 views

What happens if you jump on a “spin ship”?

If you're on a spin ship, or rotating wheel space station, and you jump, then you're no longer being accelerated by the rotation. What would happen? First, I'll establish some terms to make discussing ...
4
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1answer
370 views

Could the ISS be spun to simulate Phobos' gravity?

Before a human crew goes to Mars' moon Phobos or to even lower mass asteroids, could a long stay at such an object be simulated gravitationally in the space station? I've heard that the ISS people don'...
4
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1answer
137 views

Could artificial gravity on long space flights reduce deterioration of eyesight?

It has been found that micro-gravity adversely affects blood flow to the human eye. How will this problem be treated on flights to Mars, for instance? Rotating spacecraft, perhaps?
4
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1answer
384 views

Artificial planet

If we have discovered artificial gravitational force, will we be able to create an artificial habitable planet in our solar system? E.g., if a rotating cylindrical object in space can produce ...
4
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1answer
597 views

How rapid would air loss be in the event that a supermassive torus is punctured?

Artist's conception of a Stanford Torus. [Source] Consider a Stanford Torus of radius $ 4km $, with the inner radius of the torus ring being $1km$. Disregard structural stability issues. To simulate $...