Questions tagged [microgravity]

Questions regarding the absence of significant gravitational force.

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5
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2answers
97 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 ...
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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 ...
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1answer
88 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 ...
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1answer
101 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?
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1answer
146 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 ...
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72 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 ...
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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 ...
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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 ...
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2answers
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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 ...
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2answers
456 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 ...
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1answer
204 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 ...
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1answer
167 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 ...
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3answers
137 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 ...
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1answer
365 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, ...
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1answer
184 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 ...
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0answers
104 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 ...
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2answers
183 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 ...
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1answer
234 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 ...
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142 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 ...
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1answer
154 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 ...
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1answer
337 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 ...
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3answers
20k views

Could an Apollo astronaut stand up if they fell on the moon?

I was watching old Apollo footage and noted how astronauts on the moon had a very particular gait most likely due to the poor flexibility of the EVA suits, low gravity, and need for safety. I was ...
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Has the ISS done any experiments on animals gestation such as mice? I particularly would like to know about embryo development in microgravity

Has the ISS done any experiments on animals gestation such as mice? I particularly would like to know about embryo development in microgravity
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How was “Space Ram” (instant ramen noodles) prepared and eaten on the Space Shuttle?

The BBC Witness Podcast The Invention of Instant Noodles mentions that "Space Ram" (ramen noodles for space) was developed for eating on the Space Shuttle. After about ...
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1answer
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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 ...
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1answer
173 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 ...
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1answer
134 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 - ...
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5answers
447 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 (...
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3answers
363 views

How steady is the atmospheric drag force experienced by the ISS?

Suppose one wanted to modulate the power of a hypothetical, powerful ion thruster on the ISS to continuously compensate the atmospheric drag force in order to achieve near-perfect free-fall conditions ...
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0answers
292 views

What do the terms milli-g and microgravity mean? How are they used?

I've seen the terms "milli-g" acceleration and microgravity in many questions and answers here, within the context of spaceflight. Does milli-g refer to accelerations between 0.001 $g_0$ and 1 $g_0$, ...
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1answer
218 views

How will they mitigate the effect microgravity has in the BFR on manned trip to mars?

Very curious to know this, since it doesn't look like the BFR will utilize centrifugal force to emulate gravity as far as I know.
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1answer
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can a raspberry type powered controller device be successful in obtaining a geostationary orbit? [duplicate]

I am currently looking into the possibility of very tiny automated drone transportation. I hope to prove viability by testing using orbital mechanics experiments. Achieving geostationary orbit and ...
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1answer
1k views

What does “masquerading zero gravity” mean?

From the book Packing for Mars: An entire odd universe of mock outer space has grown up here on earth. Capsules that never blast off; hospital wards where healthy people spend months on their ...
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3answers
688 views

Is it possible to simulate Mars gravity on Earth?

Can you use an aircraft to simulate Mars gravity on Earth, similar to the way weightlessness is simulated by fling in a parabolic arc? What would the flight profile have to look like to achieve mars ...
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2answers
856 views

How do reduced gravity aircraft work?

I know the trajectory the parabolic flight takes, just not how it works. I believe it works because the floor is literally falling below you. I have heard that astronauts have been trained in water, ...
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3answers
540 views

Could daily variations of weight on Earth really be 0.003%?

I've been reading about accelerometers. On earth, in a lecture demonstration, in a table-top experiment, they will generate a signal equal to the sum of the acceleration you'd like to measure plus the ...
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2answers
171 views

Has NASA ever tested the effects of martial training to alleviate spaceflight osteopenia?

Martial artists who do thing like Muay Thai, kickboxing, and many others strengthen their bones by hitting them in various ways. Generally by kicking a hard object like a tree, by vigorously rolling ...
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1answer
104 views

Does body building help mitigate microgravity health effects? Is it used?

Do astronauts beef up their muscle mass before a mission on the ISS? Does it give a buffer of muscle mass they can lose? They don't look like strongmen, although NASA doesn't seem to discriminate size....
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52 views

Psychotropes study in microgravity

Alcohol seems to have been taken and consumed in space (not so sure about the ISS, but definitely on Mir). Is this the only psychotrope substance that has been tried in space ? Is there any formal ...
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2answers
77 views

in microgravity do you need fuel to continue same velocity? [closed]

To be more specific: Suppose a space station is orbiting in a cislunar orbit (about 1000 miles away from the Moon). Now you keep adding more mass (huge cargo) to the cislunar space station. The space ...
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4answers
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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 ...
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1answer
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Is child birth possible in lower gravity?

We are probably going to create colonies on Mars in few decades or centuries, so which steps have been taken by NASA or other space agencies to find out if child birth is possible in a lower gravity ...
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1answer
272 views

Lowest ISS microgravity

In what position is the lowest point of microgravity on the ISS? Thought the answer was everywhere on the ISS but was told this was not right.
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861 views

Can a human body change direction when floating in a space without gravity?

Suppose I am in the center of a hypothetical 4mx4m room and there is no gravity. I am wearing a spacesuit with no means of propulsion (e.g. venting, ejecting, etc..). Would I be able to reach "the ...
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198 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 ...
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1answer
425 views

Can (human) gas propel someone in a contained space station?

I am NOT trying to be lewd, but I had a student ask this. Yes, she may have been tongue-in-cheek, but I promised to answer her. And yes, I am trying to keep this as practical as possible. If and ...
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1answer
272 views

How long can an astronaut stay in space and later have children?

While reading about the effects of microgravity on reproduction I was thinking about all the other aspects of space flight and how they may decrease fertility in both men or women (such as changes in ...
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2answers
291 views

How firmly does Rosetta rest on 67P/Churyumov-Gerasimenko?

Now, since Rosetta touched down on "Tschurri", as the comet is called in the german speaking world, I am asking myself how firmly does Rosetta sit on its comet? Since on the comet very little gravity ...
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Tiny emergency propulsive device if stuck floating in a large volume in microgravity

The questions here in SXSE Can you swim in space? and in Physics SE How to escape the center of a room without gravity? [closed] both address aspects of how to move if stuck floating in the center of ...
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1answer
3k views

How are hair and beard lengths maintained in space?

From the question What are the regulations governing (against) beards in space? we know that hair and beard length are not regulated on the ISS. For the most part pictures indicate both men and women ...