76 votes
Accepted

Is the zero gravity experienced in ISS the "artificial" kind?

Gravity is everywhere. There is never any actual true "zero gravity" in the universe. But if you're in freefall - meaning following gravity's pull rather than resisting it, or being blocked ...
Stilez's user avatar
  • 1,886
54 votes
Accepted

Why can't spaceships just accelerate to create gravity?

Constant acceleration requires energy. Our current rocket engines need to use propellant to provide that energy. And there just cannot be enough propellant to generate artificial gravity for any ...
jkavalik's user avatar
  • 5,128
46 votes

Why can't spaceships just accelerate to create gravity?

jkavalik gives the right answer. But to put this in perspective, let me add some numbers. Let's say, we use a battery of state-of-the-art ion drives to retain a semi-comfortable, Martian level of ...
SF.'s user avatar
  • 55k
38 votes

When staying indoors, can missing gravity be replaced with blowing air?

in a building or closed vehicle on another planet, maybe air pressure could be used to imitate gravity There is no need to imitate gravity on another planet, because planets have gravity. Of course, ...
Jörg W Mittag's user avatar
31 votes
Accepted

Besides health benefits, what are the advantages of including inertial gravity sections on spaceships?

The presence of gravity simplifies a number of common processes. Some examples: Separating liquids from gasses, eg. getting the water out of the air after you take a shower, or removing the hydrogen ...
Mark's user avatar
  • 15.3k
28 votes
Accepted

Was the Space Shuttle ever rotated to induce artificial gravity?

There are several reasons not to do this: Artificial gravity in such a small space is not very pleasant. You'll get a noticeable difference in gravity in different places, which makes it difficult ...
Hobbes's user avatar
  • 128k
27 votes

Qualitative differences between gravity and a spinning habitat

First, I'll adopt terminology from Ringworld: "spinward" is in the direction of spin, and "antispinward" is opposite the direction of spin. And I'll say a bit about the Coriolis equation, but then go ...
Tom Spilker's user avatar
  • 18.3k
26 votes

Is the zero gravity experienced in ISS the "artificial" kind?

Gravity has infinite range, so there is nowhere in the universe where you can be free from its influence. Sure, there are places such as supervoids where the influence of gravity will be very little, ...
Ingolifs's user avatar
  • 6,458
25 votes

Is is possible to generate centrifugal gravity by doing donuts?

Thrust won't generate gravity, but it will produce acceleration which may be indistinguishable from gravity to an occupant. Yes, it's possible to simulate gravity by having a spaceship constantly ...
Anthony X's user avatar
  • 17.5k
23 votes

Besides health benefits, what are the advantages of including inertial gravity sections on spaceships?

It would help you to learn which plants can grow properly in a greenhouse on the moon or Mars. When a seed germinates, the root starts growing downward with gravity, and the shoot grows upward to the ...
DrSheldon's user avatar
  • 47.9k
17 votes

Was the Space Shuttle ever rotated to induce artificial gravity?

The highest rotational rate ever achieved by a shuttle in orbit was only 3 degrees/second (approximate). This was inadvertently caused when Mission Control uplinked a bad state vector during crew ...
Organic Marble's user avatar
16 votes

When staying indoors, can missing gravity be replaced with blowing air?

While not strong enough to produce "artificial gravity" in a microgravity environment such as an orbital space station (eg ISS), it should still be noted that air circulation, and ...
Dragongeek's user avatar
  • 18.7k
14 votes
Accepted

What happens if you jump on a "spin ship"?

We must remember that there is no spoon gravity here and that as soon as our astronaut is no longer in contact with the floor they must have an essentially straight line trajectory. Below is a ...
uhoh's user avatar
  • 149k
14 votes
Accepted

Is it possible for an Orion drive-based spaceship to experience smooth artificial gravity?

You need to realize that the ship is not accelerated by the atomic blast, it is accelerated by the springs(*) that exist between the push plate and the ship. I.e. while the push plate experiences ...
cmaster - reinstate monica's user avatar
12 votes
Accepted

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

The full problem of an O'Neill cylinder is pretty tough to solve. 1. A simple approach Analytically, one would assume to be in hydrostatic equilibrium, without fluid motion on the surface of the O'...
AtmosphericPrisonEscape's user avatar
11 votes

Besides health benefits, what are the advantages of including inertial gravity sections on spaceships?

Having a facility to investigate the effect of variable gravity levels would be very interesting from a scientific perspective. Some of the questions that might be worth finding the answers to are: ...
Slarty's user avatar
  • 9,323
10 votes

Why can't spaceships just accelerate to create gravity?

Basically, we just don't have engines that can accelerate at 1G, or anywhere near that, for more than a few minutes. Not only do we not currently have such engines, we aren't even sure when we will. ...
Nathan Tuggy's user avatar
  • 4,566
10 votes
Accepted

Why is tethered artificial gravity hardly ever considered?

Tethering two habitable modules together splits your already cramped living space into two smaller spaces that can't be easily traversed; this means a lot of equipment like life support and bathroom ...
Russell Borogove's user avatar
10 votes

Can birds fly inside an O'Neill cylinder?

You're forgetting about the air. Thanks to drag, the air inside the cylinder will have essentially the same reference frame as the cylinder itself. So a bird (or plane) flying parallel to the axis ...
Nathan Tuggy's user avatar
  • 4,566
10 votes

Is it possible for an Orion drive-based spaceship to experience smooth artificial gravity?

The short answer is to use a lot of pulses/second. They'll more or less average out into a steady(ish) push. That's why a 12 cylinder engine vibrates far less than a 1 cylinder engine.
Dan Pichelman's user avatar
9 votes

How much gravity is actually needed to avoid serious health consequences?

We do not know yet. The main issue is a lack of empirical data. There are only four specially trained volunteers with more than one year exposure to microgravity. We'd need hundreds of volunteers ...
choeger's user avatar
  • 2,443
8 votes

Why is tethered artificial gravity hardly ever considered?

There's no need for simulated gravity in human spaceflight the next several decades. It might be of interest to basic biological research, but it's up to them to buy a biological research station in ...
LocalFluff's user avatar
8 votes

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

Short answer: No, we cannot create a stationary habitat that has a gravity-like force that does not depend on motion. When we "feel" the force of gravity, what we actually feel is the ground pushing ...
Phiteros's user avatar
  • 5,626
8 votes

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

Okay, since the agreement seems to be that this is on topic and I'm a pilot I'll take a shot. The quick answer is yes, because the simulated gravity is generated from the airplane's lift, other forces ...
GdD's user avatar
  • 20.3k
8 votes

Is the zero gravity experienced in ISS the "artificial" kind?

The right way to think about it is that, always and everywhere, weightlessness is the "artificial" kind. It is certainly true that the gravitational field is very weak far from any masses, ...
Mark Foskey's user avatar
7 votes
Accepted

How would a drone work in centrifugal force generated "gravity"?

This is a really interesting question! The navigation system of the drone will have to grapple with being in a rotating frame. tl;dr: While the drop-off of gravity with altitude would be mild and ...
uhoh's user avatar
  • 149k
7 votes

Is it possible for an Orion drive-based spaceship to experience smooth artificial gravity?

Wikipedia's long article says: The pusher plate would be mounted on large two-stage shock absorbers that would smoothly transmit acceleration to the rest of the spacecraft. A diagram there confirms ...
Camille Goudeseune's user avatar
7 votes

How do you design a spacecraft with a spinning section for "artificial gravity"?

Your title question is very broad, but as-written it seems restricted to "how do I plumb between two places rotating with respect to one another?" There's a rotating house in La Mesa, CA ...
Erin Anne's user avatar
  • 11.2k
6 votes

How much gravity is actually needed to avoid serious health consequences?

We don't know. We currently only have good data for how humans are doing in 9.81 m/s² or in 0 m/s² acceleration. The only case where humans were ever exposed to anything between 1g and 0g for longer ...
Philipp's user avatar
  • 9,326
6 votes
Accepted

static energy artificial gravity

That works only as long as the two charge carriers (water and the balloon, for example) don't touch each other. When they do, the charges equalize and the attracting force drops to 0. Also, a static ...
Hobbes's user avatar
  • 128k

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