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Questions tagged [humans]

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

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.
19
votes
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 ...
10
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1answer
9k 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 ...
16
votes
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, ...
8
votes
2answers
719 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 ...
2
votes
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 ...
21
votes
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 ...
12
votes
2answers
419 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% $ ...
6
votes
6answers
753 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) ...
21
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3answers
731 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 ...
114
votes
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 ...
1
vote
3answers
902 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?
18
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2answers
1k views

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 ...
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 ...
12
votes
2answers
278 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 ...
7
votes
1answer
179 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 ...
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 ...