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Questions tagged [microgravity]

Questions regarding the absence of significant gravitational force.

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“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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 ...
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Scuba diving in free fall, do I need to worry about the Bends?

The Integral Trees is a 1984 science fiction novel by Larry Niven with an entire ecological system of oxygen breathing people and creatures, in free fall, in a gas torus. Water forms ponds, lakes, and ...
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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 ...
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Least artificial gravity needed to maintain health on a one year space trip?

What is the least gravity needed for human health on a one year space trip?
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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 ...
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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. ...
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Could humans live in microgravity indefinitely? [closed]

Astronauts have to exercise daily to prevent bone and muscle loss during long stays on space stations, but I assume this is all in preparation for when they return to the normal gravity of Earth. If ...
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Could we launch a rubble pile simulant to LEO for astronauts to practice on before visiting natural milligravity objects?

There are proposals and maybe serious plans to send astronauts to asteroids or Mars' moons, objects which are a few kilometers or just a few meters in diameter. I call them "milligravity" objects ...
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Effects of microgravity on human body in a days time

Many websites tell me effects of microgravity on the human body over a period of months. However nothing about the immediate effects of it. Could it be because there isn't any? I once read that fluid ...
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Isometrics in zero gravity

Related question... Why don't astronauts do isometrics or timed static contractions against immovable objects (like fixed bars at different heights) to sustain muscle mass and bone density in zero, ...
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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 ...
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How high can a sounding rocket launch and for how long time can it put a payload in freefall microgravity?

Sounding rockets or suborbital launches basically go straight up and then fall down without entering orbit. That requires much less fuel mass than to achieve 8,000 m/s or so orbital velocity. For how ...
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What is the amount of force needed to move an object in space?

Consider an object placed in space, where there is no gravity. What is the amount of force needed to move the object by one unit length? How does that relate to the mass of the object and the time ...
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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 ...
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How do they conduct electrolysis in zero gravity?

I'm building an electrolysis cell myself, and got to wondering. On Earth, there is a significant force pushing bubbles of hydrogen and oxygen upward, so your electrodes still contact mainly water. ...
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Is it practical to propel oneself in space with canned air?

Is it possible to move yourself at a practical, helpful speed (leaving that definition up to mathematician's discretion) using a can of air on the ISS? Let's say the astronaut is in a large room, ...
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How do we create a zero gravity environment on earth?

I have read somewhere that to-be astronauts are trained on earth to be deft enough when they are in space which has zero gravity. How do we create a zero gravity situation on earth? On earth even if ...
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How can astronauts float in space without being affected by the gravitational force of nearby objects?

According to the Newton's law of universal gravitation: Any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely ...
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How would a zero gravity cat litter box work?

In fiction cats are often chosen as the optimal zero/micro gravity pet. Clearly there is some rational for this, all existing answers at How do astronauts turn in space? include cats in them. ...