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Questions tagged [oxygen]

Questions regarding consumption and production of oxygen

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4 votes
2 answers
281 views

In principle, could the oxygen tanks of an 'air breathing' rocket, be filled during ascent?

(Thinking of SABRE and it's heat exchanger). As I understand it, Skylon would take off with full oxygen tanks. Putting aside engineering difficulties, is there a thermodynamic reason why a hybrid ...
2 votes
1 answer
53 views

How much is the estimated amount of ilmenite present on Lunar surface?

I wanted to gauge estimated amount of ilmenite that can be extracted from Lunar regolith. From that, ultimately I want to derive the amount of oxygen that can be extracted out of it. Any estimate or ...
4 votes
0 answers
132 views

Atomic oxygen and UV Radiation qualification tests for a cubesat

I'm the Assembly, Integration and Verification Engineer of a cubesat project developed by students. Currently I'm trying to create the specifications for our payloads upcoming (mon)atomic oxygen (ATOX)...
18 votes
4 answers
4k views

What stages of distress occur to a person when there is a small hull breach in space?

I'm working on a short sci-fi game and I'm curious about how the effects of a hull breach in a confined area play out. For perspective, let's say a very confined space of 100 cubic feet of normal, ...
4 votes
1 answer
175 views

Measuring Oxygen Quantity

How did the Apollo program measure Oxygen Quantity? The Command Module had a Pressure Gauge and a Quantity Guage for the oxygen bottles. Measuring pressure is simple, but I don't see how quantity is ...
5 votes
3 answers
332 views

What is the reason for a LACE rocket to dump fuel?

The concept of LACE sounds awesome, especially the part "fuel is hard to come by in the atmosphere but there's some oxidizer available". The inefficiency due to the heat exchange ...
3 votes
1 answer
847 views

How are oxygen and nitrogen replenished in the storage tanks on the ISS?

How they add gases to high pressure tanks. Will the supply trucks bring it? And how will it be connected?
8 votes
2 answers
3k views

Oxygen toxicity vs Apollo mission preparation

In the article on Apollo command module design, I read: The cabin atmosphere at launch was changed to 60% oxygen and 40% nitrogen at sea-level pressure: 14.7 psi (10.1 N/cm2). During ascent the cabin ...
10 votes
2 answers
1k views

Self-sustainable Hermetically Sealed System: Humans & Plants

Somewhat related to How many plants would be needed to produce oxygen enough for 20 humans? Suppose a number of humans are closed in a large hermetically sealed room on Earth with a glass (or other ...
16 votes
2 answers
5k views

Are there any short-term survivable locations in the solar system, outside of Earth?

Are there any known natural locations (i.e. not counting ISS) in our solar system (outside of Earth) where a human being in street clothes (i.e. without a spacesuit or other specialized equipment) ...
16 votes
2 answers
8k views

What does "stirring tanks" mean?

The Apollo 13 disaster occurred right when the "oxygen tanks were stirred". What does that mean? What benefits does it give? What would happen if they didn't stir the tanks?
15 votes
5 answers
3k views

What concentration of oxygen in a planetary atmosphere would be indicative of life?

Astronomical spectroscopy can be used to determine the chemical composition of distant bodies. In the related question Can we detect atmosphere on exoplanets? we learned that, even now, we are ...
9 votes
1 answer
369 views

Is the hybrid sulfur cycle a good way of making hydrogen and oxygen on Venus?

Assuming we collect sulfuric acid from Venus clouds using some sort of airship, what would be the best way of turning this into hydrogen and oxygen? I came across something called the hybrid sulfur ...
8 votes
2 answers
2k views

Can a machine process and run on $CO_2$ and $H_2O$ for an $O_2$ by product?

On Mars studies have shown that carbon dioxide solidifies to dry ice at the poles. During the winter months can electrolysis be applied to collected and then contained liquid $CO_2$ to replenish ...
14 votes
4 answers
4k views

Do rockets deplete the oxygen on earth?

When we use our rockets in space, are we using up a fraction of the finite oxygen here on earth? I'm assuming that it's a negligible amount at our current rate of space travel, but could this ...
4 votes
1 answer
2k views

What are the odds of finding a lifeless planet with breathable air?

As I understand it, our current breathable atmosphere on Earth is the result of early lifeforms transforming huge amounts of CO2 into O2. Before early life, even Earth's atmosphere wasn't livable for ...
3 votes
2 answers
271 views

Could we get free O₂ on Mars?

I think that the new Mars rover in 2020 will make oxygen, from thin Martian atmosphere. I think Mars' atmosphere is 90% $CO_2$. Carbon dioxide is made of $C$ and $O_2$. $O_2$ is oxygen, so can't we ...
4 votes
1 answer
190 views

Algae Bioreactor for O2 and CO2 (and food?) - Any data on required size and power requirements?

I believe that the requirements for a single persons $\require{mhchem}\ce{O2}$/$\ce{CO2}$ balance run somewhere in the region of $8m^2$ of algae, which would seem to be possible in a single $\approx ...
3 votes
2 answers
220 views

Pressurized Organic Oxygen Pods

Human waste could be used in a hydroponics facility to grow algae in space or Mars in pressurized tanks, and the photosynthesis can be used to convert CO2 to breathable oxygen. A carbon dioxide ...
6 votes
1 answer
728 views

How much algae would you need to fully support a person?

Recently, I saw a video on Cody'sLab, where an “algae panel” was constructed. This is set up like a solar panel and uses algae to convert light and air into food and oxygen. This got me wondering how ...
1 vote
0 answers
101 views

What fraction of the Kapton thickness on the ISS' solar panels was likely eroded throughout their lifetime? Predictions? Measurements?

Background @Tristan's answer to How are the silicon PV cells constructed in the ISS's solar panels? Are they as flexible as they appear here? informs us that Kapton is part of the "blanket" ...
24 votes
2 answers
6k views

Why aren't spacecraft and spacesuits pressurised to 2.5 psi (17 kPa) of pure oxygen?

Today 1 atm (101.3 kPa, 14.7 psi) with sea level composition is most commonly used on spacecraft to avoid fire hazards like in Apollo 1 (not that it would have helped the Apollo 1 crew as they couldn'...
1 vote
0 answers
65 views

Oxygen Generation System

Is there any possible failure that OGS (oxygen generation system which ISS has) can overproduce oxygen in a spaceship? Just wondering the possibility how can spaceship explode by themselves without ...
4 votes
1 answer
139 views

What transportation energy “currency” would be most suitable for mobile machinery on the Martian surface?

What transportation energy “currency” (methane, H2, electricity) would be most suitable for mobile machinery on the Martian surface? Photovoltaic (PV) cells or nuclear energy will likely be the only ...
14 votes
1 answer
1k views

How does it feel to breathe 100% oxygen at low pressure?

Some space suits are designed to provide an atmosphere of 100% oxygen but at a reduced air pressure about 20% that of sea level. Is breathing in such a suit uncomfortable? It seems like having such a ...
4 votes
1 answer
176 views

Experience of breathing regular air vs. Nitrox vs pure oxygen at 4.3 psi?

Has any astronaut/cosmonaut described a difference in the feeling of breathing pure oxygen at 4.3 psi in a spacesuit compared breathing regular air at sea level or even to Nitrox used in the Neutral ...
1 vote
0 answers
123 views

What are opinions of most planetary scientists on this study (link below), were there already some complex reviews in scientific journals? [closed]

I remember this two year old article from Universe Today https://www.universetoday.com/144402/science-fiction-might-be-right-after-all-there-might-be-breathable-atmospheres-across-the-universe/ about ...
4 votes
1 answer
385 views

Can the cryogenic expansion of liquid oxygen and liquid hydrogen be used to pump a rocket engine?

A common fuel amongst rockets is that of the combination of cryogenic liquid hydrogen and liquid oxygen. I looked at the design of a simple rocket using this cocktail that is the propellant and found ...
7 votes
2 answers
289 views

How much oxygen can MOXIE produce?

So MOXIE is using solid oxide electrolysis to produce Oxygen. I assume the amount of oxygen MOXIE can produce is limited so how much can it produce before the solid oxide electrolyzer cell stops ...
5 votes
1 answer
326 views

How many square meters of solar panel to power a MOXIE-like oxygen source per person?

If I wanted to live in a box on Mars to write my screenplay about living in a box on Mars, how many square meters of solar panels would I need to power a MOXIE-like CO2-to-O2 converter in order to ...
1 vote
0 answers
49 views

Is CO + O ==> CO2 a possibility for propelling rockets off Mars? [duplicate]

Perseverance, the Mars rover, includes an experiment called MOXIE. This is a technology demonstration to show that Mars' atmospheric carbon dioxide can be broken into carbon monoxide and oxygen. ...
15 votes
1 answer
2k views

What is the advantage of using Helium over Nitrogen when used for pressurising LOx?

In this Twitter post of the plumbing line diagram(left half) by LauncherSpace, one can notice that Helium is used for pressurising LOx while Nitrogen is used for pressurising Kerosene. Why the ...
1 vote
2 answers
198 views

Can carbon dioxide be distilled from a Helium/Oxygen atmosphere by using natural refrigeration?

A simple air compressor compress carbon dioxide/water saturated helium/oxygen air in a tank to liquefy water from the air by pressure. Abstract the water, then refrigerate the carbon dioxide/helium/...
6 votes
1 answer
549 views

Could the Moon be terraformed by outgassing its oxygen?

The majority of the Moon's mass is oxygen. With energy it could chemically be liberated from its silicon et cetera compounds and be turned into oxygen gas. Given its low gravity, lack of magnetosphere ...
0 votes
1 answer
133 views

Could we intentionally contaminate another celestial body with life to start producing oxygen?

My question is simple, could we "nuke" a planet with life to create an atmosphere over time? I was seeing a documentary about Jupiter's moon, Europa, and how it could have hydro thermal ...
4 votes
1 answer
292 views

How is CO₂ scrubbed from the air in a space vessel?

Within a space vessel such as the ISS for example, how do the astronauts regulate the level of CO₂ they are breathing and how is the air scrubbed exactly?
4 votes
1 answer
439 views

Did the Space Shuttle crew have to worry about monatomic oxygen?

Comments below this answer tell us that the Space Shuttle always remained in Earth's atmosphere. When it visited the Hubble Space Telescope or the ISS or Mir it was still in the thermosphere and ...
4 votes
2 answers
347 views

How is it proposed to extract oxygen from lunar regolith?

Futurism's news item NASA Pumps Funding into Startup That Says It Can Harvest Oxygen From Lunar Regolith says: NASA just awarded substantial funding to Pioneer Astronautics, a company that claims it ...
3 votes
1 answer
351 views

What about recycling used lithium hydroxide on the Moon?

Lithium hydroxide was used to remove exhaled carbon dioxide from breathing gas during the Apollo mission. Is there any research done how to recycle used lithium hydroxide on the Moon? Separating the ...
15 votes
2 answers
2k views

How long were the Apollo astronauts allowed to breathe 100% oxygen at 1 atmosphere continuously?

This answer explains that from the time they suited up "in the Suit Lab before launch" until the time the capsule started depressurizing during ascent, the Apollo astronauts were breathing 100% oxygen ...
6 votes
1 answer
482 views

What effects did the different air pressure and air composition in certain spacecraft have on astronauts?

The Mercury and Gemini spacecraft, and in space the Apollo spacecraft, didn't pressurize their cockpits to 1 atm with Earth-like atmospheric composition; instead, they used pure oxygen at much lower ...
3 votes
0 answers
107 views

How are cryogenic fuels and oxidizers generated and procured?

I understand hydrogen can be generated from steam-methane reforming or from electrolysis of water and then cooled to liquid through a series of cryogenic coolers. For steam reforming, the hydrogen ...
2 votes
0 answers
237 views

How much energy would be needed to liquify 1 gram of atmospheric oxygen on Mars?

I've been told I have no Moxie but I still need oxygen to live on Mars. I see that Mars' atmosphere is 0.14% oxygen and my sad moxiless self wants some. I want to make a low power refrigerator to ...
3 votes
2 answers
421 views

What was pressure and temperature of LM oxygen tanks?

After analysing comments in related question How cryogenic oxygen was heated up for CM cabin repressurization? It appears that LM had oxygen stored as either gas or supercritical fluid but not at ...
6 votes
1 answer
697 views

How cryogenic oxygen was heated up for CM cabin repressurization?

In related question How was temperature and humidity maintained inside the Apollo mission capsules? the basic concept of conditioning Apollo mission capsules environment is described. After ...
23 votes
3 answers
7k views

Why would oxygen be stored as a super critical fluid?

Organic Marble just answered a question about Apollo 13 in terms of the storage of Oxygen, and posted some fascinating stuff, including the fact that Oxygen was stored as a super-critical fluid. I ...
2 votes
0 answers
75 views

What is the best oxidizer? [duplicate]

I was wondering if there is a more efficient alternative to plain o2? Also, I know this is adding another question, but could you make a functioning rocket with ozone(O3) as an oxidizer(if it is ...
4 votes
1 answer
331 views

Could the sulfuric acid in the atmosphere of Venus be heated enough by concentrated sunlight to create water and oxygen?

The atmospheric pressure and temperature at about 50 to 60 km above the surface of Venus is nearly the same as that of the Earth, making its upper atmosphere the most Earth-like area in the Solar ...
11 votes
2 answers
701 views

Why is the surface of Mars oxidized?

Before 2.5 to 2Gya, Earth's surface was a chemically reducing environment (evidence includes reduced forms of iron, sulfur, and uranium in rocks before that time). It is believed to have become ...
3 votes
1 answer
1k views

What would it feel like for an astronaut if his/her spacesuit ran out of air?

I’m curious what it would feel like if an astronaut’s spacesuit ran out of air while they were on mars, vs taking the suit off? inspired this question