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200 votes
Accepted

Nudism in space: Why wear clothes anyway?

Clothes require laundry because they have accumulated dirt and other materials from the environment and their wearer. If the astronaut was not wearing those clothes then that material they captured ...
Brian Tompsett - 汤莱恩's user avatar
87 votes

Nudism in space: Why wear clothes anyway?

Clothing performs essential duties on the station in addition to modesty. They are an easy way to organize stuff. In addition to pockets, clothing is festooned with velcro strips for attaching tools, ...
Hobbes's user avatar
  • 128k
74 votes
Accepted

Has any human ever had the choice to leave Earth permanently?

Of the 533 humans who have been in orbit, have any of them been sent into space with enough propellant to actually escape Earth's grasp, should they have chosen to use the fuel in that manner? Has any ...
Russell Borogove's user avatar
32 votes

Has any human ever had the choice to leave Earth permanently?

Soyuz 11 The crew did not return to Earth in their lifetimes. This interpretation is obviously not what you are talking about though. Instead what is of interest is human's remains that do not return ...
Lex's user avatar
  • 1,338
31 votes

Why is it so hard to build a closed-loop ecological life support system?

It is not so much 'hard' as it is an expensive area of research that is challenging to justify funding for. Biosphere 2 proved a number of things, some of them about humans but but most significantly ...
GremlinWranger's user avatar
28 votes
Accepted

Using a fidget spinner to rotate in outer space

This is exactly how it works and how the orientation of many satellites is controlled. For example, the Hubble telescope has 4 fidget spinners installed, pointing in different directions - although ...
asdfex's user avatar
  • 15.1k
28 votes
Accepted

Why is it so hard to build a closed-loop ecological life support system?

To answer another facet of your question that others have looked over, is the question of why it is so easy to do with much smaller "ecosystems in a jar". You would think a larger system ...
Anthony Khodanian's user avatar
26 votes

Nudism in space: Why wear clothes anyway?

In addition to capture of contaminants, such as dead skin, hair, sweat, etc, and abrasion/cut protection, clothing forms a basic thermal layer that allows the human body to better regulate its ...
Adam Davis's user avatar
  • 1,103
24 votes
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How do I dress for a hike on a hot summer day on Titan?

The ESA Huygens probe very accurately characterized the conditions at its landing site on Titan's surface and verified measurements made by the Voyager 1 Radio Science (VRS) investigation nearly 25 ...
Tom Spilker's user avatar
  • 18.3k
23 votes

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

A -183 C nitrogene-methane mix doesn't make you an icecube on the spot, but it still causes quickly frozen wounds. Your only way to avoid it if your whole body is protected, no $cm^2$ may remain open. ...
peterh's user avatar
  • 3,298
22 votes
Accepted

Is it possible to get married in space?

Many jurisdictions recognize weddings performed out-of-jurisdiction provided that those weddings are legal in the jurisdiction they're performed in. Unfortunately, there's no legal authority with ...
Russell Borogove's user avatar
18 votes

Nudism in space: Why wear clothes anyway?

A picture might be worth a thousand words. Just imagine this situation without clothes:
Eric Duminil's user avatar
  • 1,788
16 votes
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Martian dust getting into habitats

One proposed solution to contamination of a habitat by extra-vehicular activity is a Suitport which eliminates the need to bring the suits inside. The crewmember enters and exits the suit through a ...
Organic Marble's user avatar
14 votes

What is the maximum atmospheric pressure a human can tolerate?

The answers are found in the SCUBA diving world. Diving is interesting in this sense in that 10m is roughly an increase in pressure of 1atm. In general, you wont see humans doing well above 30atm. ...
Cort Ammon's user avatar
  • 2,211
13 votes
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What would the human gait look like on Mars?

Indeed Mars's gravity is about twice that of the moon, but getting around on your own two feet will probably be similar, at least when in an environmental suit. In my answer to the question about ...
Tom Spilker's user avatar
  • 18.3k
10 votes

Is it possible to get married in space?

After reviewing the Canon Law, it should be possible to get married in space in a way accepted by the Catholic Church. Many countries accept a Catholic marriage as valid into their own jurisdiction ...
Ángel's user avatar
  • 201
10 votes
Accepted

How does the Dragonfly helicopter for Titan compare to Perseverance, Ingenuity and a human in terms of size, mass, weight and daily range?

tl:dr; cropped from large image below (own work). quick bash, can't find actual dimensions, details seem to vary on vehicle as evidenced by nose. 3m box for aeroshell reference human is about 5'9&...
blobbymcblobby's user avatar
9 votes

How much gravity is actually needed to avoid serious health consequences?

We do not know yet. The main issue is a lack of empirical data. There are only four specially trained volunteers with more than one year exposure to microgravity. We'd need hundreds of volunteers ...
choeger's user avatar
  • 2,453
7 votes

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

Transverse forces supine +Gx "Lying on your back, Eye Balls In" Recommended high acceleration position Transverse forces prone -Gx "Lying face down, Eye Balls Out" Second-best high acceleration ...
Winchell Chung's user avatar
6 votes

What is the maximum atmospheric pressure a human can tolerate?

How much pressure can the human body tolerate before living is impossible The maximum tolerated pressure by a diver. It can be over 65 atm or bars. See: Saturation_diving
argon's user avatar
  • 103
6 votes

How much gravity is actually needed to avoid serious health consequences?

We don't know. We currently only have good data for how humans are doing in 9.81 m/s² or in 0 m/s² acceleration. The only case where humans were ever exposed to anything between 1g and 0g for longer ...
Philipp's user avatar
  • 9,346
6 votes

Upper limit of human comfort in higher atmospheric pressures?

I can’t answer your question with a specific pressure, since symptoms depend on the individual, the rate of descent, time at depth and lifetime exposure to high pressure. Symptoms from high pressure ...
Woody's user avatar
  • 22.1k
5 votes

Is it possible to get married in space?

It may be possible. According to the Huffington Post in 2012, the Bahamas allowed for marriage in international waters as long as it took place on a cruise line registered in the Bahamas. I am not a ...
called2voyage's user avatar
  • 23.7k
5 votes
Accepted

Artificial gravity on Mars

The short answer is: we don't know. We have usable data on physiological effects for only three gravity levels: zero, Earth g, and 1/6 Earth g, the latter for only three days or less at a time, so ...
Tom Spilker's user avatar
  • 18.3k
5 votes

Pressurized Organic Oxygen Pods

The stoichiometrics of respiration say that the CO2 exhaled by one person, plus their poop, can be converted by algae into 3000 calories of nutrition and 26 moles of oxygen (enough for a day) using ...
Woody's user avatar
  • 22.1k
5 votes

How much gravity do Humans need?

This is an excellent (if unanswerable) question. There is insufficient evidence to provide an answer which meets SE standards. But you asked for an educated guess. I’m educated. Here’s my guess: First,...
Woody's user avatar
  • 22.1k
5 votes

If we could mine asteroids, how would we get the stuff mined from said asteroid back to earth?

We probably do not, at least not at scale. There are some minerals (platinum and friends) where 100 tonnes would be meaningful, but for most you need millions of tonnes to be achieve much, and at this ...
GremlinWranger's user avatar
4 votes

Outer space and dark-adapted vision

Answer: Yes and no. Being in a dark environment (such as dark side orbital transit) will allow the retina to dark adapt. But a half LEO (lasting about an hour) is not long enough duration to fully ...
Woody's user avatar
  • 22.1k
4 votes

Has any human ever had the choice to leave Earth permanently?

No and yes. Rockets are costly things and no human ever left Low Earth Orbit, except the Apollo astronauts. Others had not enough fuel to do that. The Apollo astronauts had theoretically the option ...
peterh's user avatar
  • 3,298
4 votes

What is the maximum atmospheric pressure a human can tolerate?

There does not appear to be a maximum pressure. We hit a limit as Cort Ammon says but that is a matter of what we can breathe, not an actual pressure limit. You get poisoned by going too deep, not ...
Loren Pechtel's user avatar

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