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Questions tagged [humans]

Questions relating to human physiology, as it affects capabilities in space.

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2answers
5k views

How do I dress for a hike on a hot summer day on Titan?

Titan has an atmosphere with a surface pressure of around 150 kPa. It has an average surface temperature of around 94 K, around -183°C. On a nice, sunny, calm, summer day near the equator, it may ...
5
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1answer
98 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 ...
21
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5answers
4k views

Is it possible to get married in space?

Is it possible to have a legal wedding in space? For example, any of the following could answer the question: Does any national law system explicitly define a specific process for validly performing ...
114
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4answers
28k views

Nudism in space: Why wear clothes anyway?

Currently, doing laundry in microgravity is an unsolved engineering problem. The result is that clean clothes on the International Space Station have become a consumable resource. Clean clothes get ...
5
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2answers
205 views

What is the best position for a human to be in during launch?

We know from the answers to the question If a human is being sent to space in a rocket, does the seating angle matter? that seating position at launch is of less concern than landing. We also learn ...
4
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0answers
85 views

What is the probability that a deep space crew is hit by a Solar proton storm?

The Sun's magnetic field now and then accelerates a gigantic amount of high velocity protons in different directions. Regardless of the types and causes, let's call it "proton storm" when it is ...
5
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2answers
1k views

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 ...
4
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0answers
141 views

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 ...
5
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2answers
312 views

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 ...
12
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2answers
407 views

Decision Factors for using 100% $ O_2 $ cabin atmosphere in early US space program

What are the reasons for deciding to use a 100% $ O_2 $ cabin atmosphere in the early US space programme? Was danger of nitrogen narcossis a factor? Did all missions prior to Apollo 1 use a 100% $ ...
2
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1answer
185 views

Footage of Space Shuttle astronauts during launch and reentry

Is there readily available video of Space Shuttle missions showing the crew: During the entire time period from ignition to shortly after the shuttle has passed through planet Earth's atmosphere? ...
8
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2answers
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Why only 2 male astronauts for the Year In Space ISS Mission?

I wonder why the space agencies chose only 2 males for the Year In Space ISS Mission? I think it would have made more sense to have at least 1 male and 1 female astronaut, or more preferably 3 male ...
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3answers
884 views

Are exoplanets in the habitable zone suitable for human colonization?

If they found the those planets in the habitable zone, are they planning ahead for human settlement of them?
8
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2answers
693 views

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 ...
11
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1answer
844 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 ...
3
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1answer
444 views

How heavy does radiation shielding have to be for a nuclear power plant on a crewed spaceship?

How important is the mass penalty for shielding when using nuclear power on human space missions? In addition to solar and cosmic radiation, living next to a nuclear reactor large enough to support a ...
10
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1answer
8k views

Maximum survivable long term g-forces

I assume this hasn't got a precise answer, but I was wondering if anyone had an indication of the maximum survivable long term g-forces, if the persons positioning was optimal? For example, could you ...
3
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1answer
194 views

How would cryogenics work to keep a pilot alive during long term travel?

How would a cryofreeze work in order to keep the pilot alive long enough to survive an automated travel to some destination?
5
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1answer
477 views

What has been done and what remains to be done to land humans on Mars? [closed]

I get the impression that NASA has done alot to make a crewed landing on Mars possible. Not as a focused mission like Apollo, but piece by piece in spite of the lack of dedicated and lasting political ...
14
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4answers
2k views

Do humans need less calories and water in microgravity?

Astronauts in microgravity don't use their legs much. This has negative health effects in the long run. But I wonder if it doesn't have the good side of lowering human need for food and water and thus ...
4
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1answer
991 views

Does space environment affect human embryonic development?

What would the effects of pregnancy in space environment be on a human fetus? I understand that astronauts on long-duration missions in microgravity environment experience bone density loss. Would ...
23
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2answers
4k views

Could you fly on the Moon, in Earth's atmospheric pressure, by flapping wearable wings?

According to this site, NASA produced a public domain painting representing what the Olympics could look like on a lunar colony. In the upper right of the picture, there are people flying by flapping ...
14
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2answers
3k views

Can humans live in something like the ISS around gas giants?

Beside solar winds and cosmic rays, would they need some form of shielding from whatever deadly comes from these planets ? And about this potentially deadly stuff coming from the planets, what would ...
2
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1answer
208 views

Combating negative effects of space

After seeing this article about a skin-tight space suit, I was wondering what were the different ways of combating the negative effect of being in space, e.g. artificial gravity? How far away are ...
6
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1answer
2k views

Do NASA currently (early 2014) have any development projects for a better space ship?

Is NASA developing a new generation os human transportation ship, or are they doing any kind of research and/or development which final aim is to invent a new space ship model? If I know well, NASA ...
2
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2answers
1k views

Won't an astronaut exposed to the vacuum of space bleed from everywhere?

A woman kiss can cause the blood raise to the top levels of skin, leaving you violet mark on skin. However articles about space exposure (wikipedia, nasa.gov) do not talk about bleeding at all... So ...
18
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2answers
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Can I drink the water from the plumes of SSME?

Shuttle's SSME uses cryogenic Hydrogen(LHX) and Oxygen(LOX) as their propellent to give hot water vapour. If I somehow manage to get the exhaust plume and condense it to liquid, Can I drink it ...
11
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1answer
371 views

Do astronauts take any pills to battle bone density loss?

Is the effect of micro-gravity on bone structure similar to osteoporosis? If so, do they often take simple pills like calcium or more advance medicine such as ones listed here? Lastly, are they ...
19
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3answers
8k views

How do astronauts turn in space?

A recent question back in Physics asks whether there is a way for an astronaut to rotate when in microgravity and without touching anything else, while still conserving angular momentum. One way to ...
14
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1answer
620 views

Could helmet-fogging occur on Mars, or on any other celestial body with an atmosphere?

When I drive in cold/wet weather the state of the roads is cause for concern. But more worrying is the risk of the wind-screen fogging over when least it should. Space/Earth orbit is a different ...
16
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1answer
2k 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, ...
7
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1answer
173 views

What is the exercise regimen under the SPRINT program?

NASA says (emphasis mine) Current exercise countermeasures on the International Space Station (ISS) are insufficient to prevent muscle atrophy, cardiovascular deconditioning and bone loss ...
3
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1answer
2k views

Do we have motion sickness in zero gravity? [duplicate]

In zero gravity, the vestibular system (which is responsible for feeling the balance) doesn't work since the fluids in it don't move properly in absent of significant gravitational force. Does it also ...
12
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2answers
261 views

Is there any research or recommendations for a diet in microgravity?

The Dietary Reference Intake (aka RDA) is formulated for humans operating at one Earth gravity. Is there a similar reference or any research supporting specific recommendations for a human in ...
21
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3answers
722 views

Does long-term residence on the ISS affect eyesight?

Life on a space station is very confined. For months on end, astronauts are kept in a structure that's about the size of a football field on the outside and much smaller on the inside. The nearest ...
6
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1answer
104 views

What would an effective means be of protecting a habitat from UV-C radiation?

We are lucky on Earth, the ozone layer protects us from UV-C by absorbing wavelengths below about 280nm. However, the same can not be said for in space and on places like Luna and Mars. I would ...
6
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6answers
737 views

What are the effects of body building on heavy planets?

This answer suggests that outer planets are very heavy and that lifting things on it is very energy expensive. If someone was to workout on a planet that is considered 'heavy' (whatever that means) ...
19
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2answers
6k views

How would an astronaut's hand react to a hard vacuum?

What would happen if an astronaut took his/her glove off in space but had the rest of their body completely sealed off? My guess is that the hand would start to boil or freeze depending on location.