Questions tagged [microgravity]

Questions regarding the absence of significant gravitational force.

Filter by
Sorted by
Tagged with
12
votes
2answers
859 views

How do people drink from cups in Space?

How do people drink from cups (an activity which heavily relies on the presence of gravity) in space? I know they could try to wait for the liquid to 'split up' and try to catch a chunk, but is there ...
10
votes
1answer
1k views

Why might an astronaut wear their wristwatch very loosely aboard the ISS?

In this video of CSA Astronaut Chris Hadfield aboard the ISS, he wears his watch very loosely--so that it continually bumps against different sides of his arm. I imagine this might be mildly ...
18
votes
6answers
4k views

Would a higher air pressure on the ISS or elsewhere make it easier to “swim” in microgravity?

What if the atmospheric pressure onboard the ISS was 5 atm, 5 times the pressure on Earth and currently on the ISS, while maintaining the breathable oxygen level, e.g. if the additional atmosphere ...
4
votes
1answer
284 views

Generating power in zero-g

When generating electricity, energy is lost to friction in mechanical bearings (e.g. turbine or generator bearings) and as heat, through resistance in transmission wires. If you were generating ...
3
votes
2answers
142 views

Is there any record of a fountain pen having been used in microgravity?

It's a known fact that a wide variety of both generic and specially-engineered writing implements are currently used in space, by both the Russians and the US. But is there any known instance of a ...
0
votes
2answers
81 views

Are the SpaceShipTwo pilots weightless when the craft separates from the WhiteKnightTwo?

From my point of view, when the SpaceShipOne and Two get released from their carrier planes (WhiteKnight and WhiteKnightTwo) they are in free fall, therefore the pilots should become weightless inside ...
7
votes
5answers
4k views

Can a free falling astronaut change his spin and orientation?

Imagine that an astronaut during an EVA is cut loose from the space station and falls away from it in a tumbling way. Without any foreign object or air to interact with, could he stop tumbling and ...
14
votes
2answers
7k views

What is the context of this seemingly “zero-gravity” photo on Earth?

A man appears to be in zero gravity in a room which doesn't look like it could possibly be inside of an aircraft. If so, that's one gigantic aircraft, entirely unlike all the other photos of the "...
14
votes
3answers
1k views

How many seconds of near-zero gravity are practical with a Reduced Gravity Aircraft?

When I saw "50 seconds of weightlessness" (see quote below) I made a very rough estimate based on 45 degrees nose-up to 45 degrees nose-down Reduced Gravity Flight centered at about 35,000 feet where ...
10
votes
3answers
3k views

Was this printer shown the ISS in 2015 built specially to work in microgravity?

The question Printer on board of the ISS? was answered in the affirmative. This seems to be a printer with a special paper cassette on "top" to feed the paper, since gravity feed is not going to work. ...
1
vote
7answers
657 views

What does it take for a craft to perform a flight simulating weightlessness without having to fly a steep parabola/ellipse?

Alright, I'll try to ask a better question on what I mean so that we figure out how one becomes weightless in a craft without having to fly steep parabolae. Other than flying parabolae or nose-down ...
2
votes
0answers
69 views

What is it like for ISS astronauts to re-adjust to the Earth's gravity?

ISS expeditions last up to half a year, as long as a flight to or from Mars would last. Here I answered to a question dealing with the adaptation of Martian visitors from microgravity to Martian 0.38 ...
42
votes
2answers
14k views

Can fish really live in microgravity without water?

Yes, you read that title correctly. I saw the claim in "Colonies in Space", hosted on the NSS site. In a weightless space farm, it may be possible to raise fish without water. On Earth, when a ...
3
votes
0answers
30 views

How can normal sports be modified for playing in micro-gravity conditions? [closed]

What new equipment would we use to play sports such as football, basket ball, etc., in micro-gravity? What changes would we make to the games above? Also, are there any scholarly articles or proper ...
1
vote
0answers
73 views

How much gravity could someone handle who lived his/her entire life in microgravity? [closed]

Let's say someone who was conceived and born in microgravity and spent his/her entire life on a space station in weightlessness until age 20 decides to land on a celestial body. How much surface ...
1
vote
0answers
138 views

Is there a term for the activity of weightless astronauts hanging out on walls or ceilings?

Weightless astronauts often sit, stand, walk, or sleep on (or near) surfaces that (with gravity) we would normally call walls or ceilings. I reference such a phenomenon in my comment here: I would ...
13
votes
4answers
2k views

How do iPads on the ISS know which way is “up” for their users?

The question What makes smartphones tilt-sensitive? Will they retain this ability in zero-gravity conditions? brought to mind the video of astronaut Steven Swanson's detailed tour of the ISS, in which ...
13
votes
1answer
1k views

Would human “superpowers” in low gravity fade away through reduced muscle mass?

If suddenly put in a low gravity as on the Moon or on Mars, humans should feel very strong, easily breaking some olympic records for example. Apollo astronauts have said that they did not get tired ...
6
votes
1answer
399 views

Do astronauts develop the ability to regularly place an object at rest inside the ISS after extended periods in microgravity?

This image from the ESA prompted the question why the fruits at the bottom left were not floating. An online response claimed after an extended time on the ISS astronauts get used to placing ...
3
votes
1answer
160 views

What is the most massive object in the ISS whose position was altered by the circulating air?

In Leo S's comment to the question, Do astronauts develop the ability to regularly place an object at rest inside the ISS after extended periods in microgravity?, he said "forces due to circulation of ...
24
votes
4answers
6k views

Is there a self-rounding celestial body from which an Olympian could jump into space?

Is there a self-rounding object in our solar system whose mass is insufficient to prevent the highest jumping human from escaping its gravity?
8
votes
2answers
653 views

How big are the tidal accelerations within the ISS?

This question asks about placing an object at rest in the International Space Station. But the ISS is a large object, large enough that gravity will vary across it and cause tidal forces that can ...
1
vote
1answer
249 views

Can an astronaut stand at attention in the ISS?

Am I correct in assuming it is near impossible for astronauts to stand still inside the ISS, even if their feet are secured under a blue IVA rail? NASA astronauts Terry Virts' foot under a blue IVA ...
5
votes
2answers
119 views

Do astronauts on the ISS refer to themselves as standing?

When on the CEVIS,(Cycle Ergometer with Vibration Isolation Stabilization) I'm assuming the astronauts would say they are sitting. When they secure their feet under a blue IVA rail do they say they ...
13
votes
1answer
4k views

Why did a shuttle astronaut have an open book during ascent?

In the top right of the video of a shuttle launch an astronaut has an open book resting on (attached to?) the left thigh. What was the purpose of this book? The astronaut then seems to take a pen or ...
0
votes
1answer
93 views

How does water respond in 0g?

I'm imagining a small orb magnetically suspended inside a sphere of any paryicular size floating in 0g. What would happen if you rotated the orb at a high/varied velocity? And what if you change the ...
5
votes
2answers
579 views

How will SpaceX's Starship accommodate its 100 passengers from the effects of micro-gravity?

According to this Wikipedia article, Starship will take on average 115 days (3.8 months) to get to Mars and 150 days maximum (4.9 months). with an average trip time to Mars of approximately 115 ...
5
votes
1answer
196 views

Do astronauts use their toes to grip with in zero gravity?

Feet and toes are not usually as dexterous as hands and fingers but they can grip and hold things. With training and practice they can be like third and fourth hands. Are there any astronauts who make ...
5
votes
1answer
191 views

Term used to identify the blue bars/rails in the ISS?

The interior of the ISS is filled with blue bars used by astronauts to secure their feet and remain in one place. Does NASA have a term for these?
3
votes
0answers
86 views

Aerosol products in space

I am assuming aerosol products are not used inside the living environment of a spacecraft while it is microgravity. Is that correct, or are there examples of such products being used while an ...
7
votes
1answer
313 views

What physiological effects did the Apollo astronauts experience due to the lower lunar gravity?

When humans are exposed to weightlessness they often experience space adaptation syndrome (similar to motion sickness). Also fluid redistribution to the upper body is nearly immediate causing bulging ...
14
votes
4answers
3k views

How is lower/no gravity simulated on a planet with gravity, without leaving the surface?

I have seen videos of simulated lower gravity (possibly for training astronauts). I am curious what methods/techniques can be used to simulate lower gravity like environments without leaving the ...
4
votes
0answers
53 views

What is the name of the animal vaccine created in space? (according to Robert Zubrin)

I'm reading "The Case for Space" and on pg 47 of the book, Zubrin mentions that some sort of animal vaccine was created thanks to research done in microgravity and in space. He goes on to say that ...
9
votes
2answers
2k views

Microgravity indicators

As mentioned in the YouTube clip below and in the image, in the Soyuz craft hangs small toys or dolls as microgravity indicators. Is this really the purpose of the dolls being hung? Are people not ...
7
votes
1answer
265 views

How do astronauts get eye drops into their eyes?

This answer mentions that some astronauts use eye drops to relieve irritation caused by dust and lint in the air. How do they do get the drops in their eyes in microgravity? When I put drops in my ...
5
votes
1answer
172 views

Does NASA no longer own a “Vomit Comet?”

This Wikipedia article seems to suggest that NASA no longer owns an aircraft capable of simulating weightlessness, and that such astronaut training is now contracted from a private company. Can this ...
1
vote
3answers
147 views

What are the biological effects of a toe-to-head force gradient upon a human over the long term?

This question pertains to the notion of constructing rotating spacecraft and habs for human use in space in order to mitigate the effects of microgravity. Such craft have been a staple of many sci-fi ...
9
votes
1answer
1k views

Healing of bruises and internal bleeding in 0g

I heard an unsourced claim about wounds, bruises and internal bleeding healing much worse in 0g conditions than in normal gravity. Is it true? And if so - could you provide a quantitative comparison, ...
5
votes
1answer
236 views

Have mechanical wrist watches been successfully used in space?

Has a mechanical wrist watch been successfully used in spaceflight? Have there been any problems using them that are related to the many unusual aspects of the spaceflight environment, perhaps ...
7
votes
2answers
199 views

How do astronauts maintain their neck muscles?

The human head weighs 5kg. This weight keeps the neck toned and strong. In zero gravity on extended missions how do astronauts maintain muscle and bone strength in their necks? What type of neck ...
1
vote
1answer
260 views

ISS location identification; estimate size and direction of astronaut acceleration puzzler

note: This question addresses the same video and phenomenon described in this answer (which I found after posting this) but here I'm asking for an analysis of the trajectories of the test masses (the ...
32
votes
3answers
4k views

What causes microgravity (i.e. non-zero gravity) in orbit?

NASA and others seem careful to talk about microgravity instead of zero gravity. Why is for example the ISS not in zero gravity? Is it because of movements onboard? Because of variations in center of ...
9
votes
3answers
6k views

Are magnetic boots in space practical?

I can't count how many science fictions stories I have read where someone is strapping on magnetic boots to walk in or on a space ship without gravity. How realistic of a solution is this? Just for ...
8
votes
1answer
461 views

Can centrifugal force actually overcome the health problems of microgravity?

Microgravity has a negative health effect which exercises cannot completely remedy. Rotation of spacecraft and the resulting centrifugal force have been suggested as a source of pseudo-gravity. But ...
6
votes
1answer
141 views

How soon can beginning of visual impairment due to intracranial pressure be observed?

The spaceflight-induced visual impairment was a serious problem for astronauts remaining for a long time in microgravity. In the early periods after discovery of the condition, the obvious symptoms - ...
18
votes
1answer
3k views

How do astronauts battle loss in blood volume in microgravity?

Past manned space missions teach us that the loss in gravity gradient has an adverse effect on the blood volume of astronauts. Our bodies are simply built to expect pressure gradient and in gravity, ...
5
votes
0answers
160 views

“Prolonged exposure to microgravity … makes facial hair flammable”?

TheWeek recently published an article titled "The Colonization of Space", which contained the following sentence (emphasis added): Prolonged exposure to microgravity weakens bones, atrophies ...
3
votes
0answers
202 views

Would pole dancing cure microgravity health issues?

It is often suggested that gravity should be simulated by rotating the entire habitat module of astronauts in microgravity. But wouldn't pole dancing be enough? The individual astronaut swinging ...
0
votes
1answer
167 views

Would I be able to do a “slosh test” to see if a container is having liquid, in microgravity?

Suppose I had two large containers with 1 cubic meter size. The containers are identical on the outside. The containers are floating in microgravity very close to my space ship. One was empty but ...
5
votes
5answers
501 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 (...