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197 votes
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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 ...
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85 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, ...
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74 votes
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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 ...
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31 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 ...
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28 votes
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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 ...
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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 ...
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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 ...
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23 votes
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Can humans live in something like the ISS around gas giants?

This is a pretty broad questions, as it would depend on which gas giant you have in mind. Excluding Uranus and Neptune as ice giants, this leaves us with Jupiter and Saturn in our own Solar system, ...
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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. ...
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22 votes

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

The lift force you would need to produce would have to be equal (stable flight) or greater (take off) than the force pulling you back towards the moon. If your mass is average for a male at 62kg, the ...
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  • 4,361
21 votes
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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 ...
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16 votes
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Why only 2 male astronauts for the Year In Space ISS Mission?

The test had to start somewhere. There are a number of reasons why they couldn't simply do a 6 person stay, that make it somewhat difficult at least. These include: There is a natural cycle to bring ...
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16 votes

Nudism in space: Why wear clothes anyway?

A picture might be worth a thousand words. Just imagine this situation without clothes:
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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 ...
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15 votes

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

It depends how suit is built. And in fact pretty similar thing happend to Joe Kittinger during his (>50 years long standing before it was recently beaten by Baumgartner during Redbull Stratos flight) ...
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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 ...
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12 votes

Maximum survivable long term g-forces

It is hypothesized that the only acceleration that can be tolerated for looong time without side effects is the normal acceleration. Human subjects have been exposed to continuous high-G environment ...
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12 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. ...
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  • 1,834
11 votes

Do humans need less calories and water in microgravity?

Almost certainly not. First of all, astronauts work out for hours every day, specifically to prevent the deterioration of bones and muscles. Moreover, the human energy budget is dominated not by the ...
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11 votes
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Decision Factors for using 100% $ O_2 $ cabin atmosphere in early US space program

Despite a higher risk of a fire, pure oxygen also has some advantages. First, the internal pressure of the vessel is only a fifth of a normal breathing mix, allowing less structural load on the hull ...
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10 votes
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Mitigating nausea when generating artificial gravity by centrifuge

The problem is about a so called 'comfort zone'. In fact it is not radius but a ratio of radius and angular velocity. Nausea or motion sickness is caused mostly by Coriolis acceleration which makes '...
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  • 1,148
10 votes

Do humans need less calories and water in microgravity?

From one NASA study which examined several space shuttle crews: "Energy expenditures were similar before and during flight." However, there was a decrease in energy intake (also noted in this journal ...
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10 votes
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Effects of microgravity on human body in a days time

Organic Marble, as usual, is correct in his answer, as far as it goes. Anecdotally, I can add a few primary effects and one secondary effect to the list: Fluid transfer to the head (a primary effect)...
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10 votes
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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&...
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9 votes

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

Live, yes. Thrive? No. The ISS and stations like it are not "benign environments" - that is, they are life sustaining, but not safe for long term habitation on the order of years. They lose air, ...
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  • 11.5k
9 votes

Does space environment affect human embryonic development?

We don't know. There was some research done on embryonic development of mice and rats in microgravity, both impregnated females sent to orbit and later recovered (mostly onboard Space Shuttle, but ...
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  • 75.5k
9 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 ...
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  • 191
8 votes

Do humans need less calories and water in microgravity?

Apparently the sense of taste is dulled in space. Thus favorite food stuffs are things like Tabasco sauce, and other spicy things. Thus they may eat less, due to reduced taste and desire to eat. (...
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  • 76.5k
8 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 ...
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  • 2,373
7 votes

Mitigating nausea when generating artificial gravity by centrifuge

Is there a minimum diameter? Yes. Every study I've come across agrees on that. What is that minimum diameter? As I found while answering this question over on WorldBuilding.SE, there's quite a bit ...
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  • 11.5k

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