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TheRedstoneHive
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18 Aug 2018 16:43

This planet's (RS 8474-1359-6-196333-67 B3) atmosphere is slightly toxic due to the high levels of SO2 (1640 ppm, or 0.00076 atm) though that would rain down in the colder areas of the planet. But the rest of the atmosphere is not too bad; 
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Planets with potentially breathable atmospheres

18 Aug 2018 20:43

The CO2levels are also quite toxic.
 
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18 Aug 2018 21:19

Himself wrote:
The CO2levels are also quite toxic.

True, but going to a higher altitude will bring the CO2 level down enough to be uncomfortable, but survivable.
However even going to a higher altitude won't bring the SO2 levels down enough for survival.
 
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18 Aug 2018 21:33

Foud a Terra with not too bad O2 levels, okay CO2 levels (probably best to go to higher altitudes) but still toxic SOlevels.
The planet's Mass, Diameter and thus gravity is similar to Earth's, there is unicellular life in the oceans, and a total ESI of 0.949.
The planet's name is: "RS 8474-900-6-66722-286 A4" -One of the best I have found so far.
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18 Aug 2018 21:44

Planets that are Oceanias aren't very good for theoretical colonisation, though if the atmosphere has the right mix and the atmospheric pressure is 0.1 - 2.5 atm, living at the ice caps is not a bad idea. Earlier today I found this water world: RS 8474-3161-7-826197-655 4.
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19 Aug 2018 01:44

Very, very awesome composition of atmospheric gasses. I think this planet certainly deserves an Honorable Mention.

Great find!!!

BUTT.... just like being at a high altitude here on Earth, with air pressure that low, water boils at the normal temperature of the human body, or around 37 degrees Celsius. The Armstrong Limit, also referred to as Armstrong's line, begins at 18-19 km (59,000-62,000 ft) above sea level, where the atmospheric pressure is a very low 6.3 kPa (about 1/16 of the standard sea-level atmospheric pressure of 101.3 kilopascals (760 mmHg).

Named after the Air Force guy who noticed the saliva on his tongue was boiling away when flying too high in an unpressurised room-temp environment. The blood inside your veins DOES NOT boil, it is already inside a pressurized system - called your body. Your blood pressure would however at least double and you'd be crying bloody tears. No amount of breathable oxygen delivered by any means will sustain life for more than a few minutes at such low pressure.

Armstrong limit = 6.25 kPa (0.906 psi) or 0.0616827 ATM
Mount Everest summit = 33.7 kPa (4.89 psi) or 0.3325931 ATM
Earth sea level = 101.3 kPa (14.69 psi) or 1 ATM
Dead Sea level = 106.7 kPa (15.48 psi) or 1.0530471 ATM
Olympus Mons summit = 0.03 kPa (0.0044 psi) or 0.000296077 ATM
Mars average = 0.6 kPa (0.087 psi) or 0.00592154 ATM
Hellas Planitia bottom = 1.16 kPa (0.168 psi) or 0.01144831 ATM
Surface of Venus[6]     9,200 kPa (1,330 psi)

Your planet = 21.1769 kPa (3.07 psi) or .209 ATM (higher than Mt Everest, but under the Armstrong Limit, and alot better than Mars).

The lowest tolerable pressure of air is about 0.47 ATM. You could live at that pressure for a few years perhaps. At about 0.35 atm (less than 356 millibars) life is impossible. Pulmonary and cerebral edema lead to death. The lowest atmospheric pressure humans can breathe in, with a pure oxygen supply on hand with a sealed breathing mask, is roughly around 0.12 ATM or 121.7 millibars, the pressure found at 49,000 feet.

By the way, the highest pressure Humans can tolerate to breathe in is around 2.5 ATM.
Oh, and let's not forget, this planet's oceans would have vaporized long ago.
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19 Aug 2018 02:09

Gnargenox wrote:
Source of the post The lowest tolerable pressure of air is about 0.47 ATM. You could live at that pressure for a few years perhaps. At about 0.35 atm (less than 356 millibars) life is impossible. Pulmonary and cerebral edema lead to death.

I am pretty sure that is due to the partial pressure of oxygen being too low when you reach that altitude on Earth, not an effect of the total pressure.  For reference, in mountaineering HAPE and HACE can be avoided, or improved, by administering oxygen without requiring descent or pressurization (although descent is the better choice if possible).

The Armstrong limit is probably a better indicator of the lowest total pressure that humans can endure (or at least closer, if not exactly).  The graphic on the first page is also consistent with this, showing humans can survive at lower pressures with higher oxygen concentration, up to about 40,000 to 50,000 feet altitude (about 20 to 13 kPa, or 0.20 to 0.13atm) if on pure oxygen.  At 50% oxygen humans can be comfortable at the summit of Everest (0.33atm).
 
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19 Aug 2018 12:10

According to the mountaineer Noel Odellthe highest point (lowest pressure + lowered O2 levels) at which humans can live comfortably for an indefinite period was at 23'000 feet and 7.0649 KPa (0.069atm). That would be only slightly above the Armstrong Limit. One of the highest communities on Earth is of course in the Andes, La Rinconada, at 16'732 feet with a population of around 30'000 people. To top it all of, it is a gold mining town, with one of the harshest working conditions in the world, and perhaps a 'golden' example of some of the conditions we humans can endure. Its pressure is between 58 and 45 KPa (or about half an atmosphere, 10.475% O2).

We must take into account the fact that astronauts, air force test-pilot personnel and great mountaineers are exceptional individuals harden by years of training and experience. The Tibetans and people living in the Andes have been physically acclimatized by generations of living in those mountains (A typical and simplified example is that most of the high-altitude people are short). These groups do not represent the average 'colonist' on an alien world in the modern sense. However, in the future, when colonizing planets might be a reality, undoubtedly the individuals aboard a colony ship would be augmented by cybernetics and genetic biomorphing that will allow them to live on planets that are not overtly hostile.

I notice that the question of "what atmospheric extremes can humans endure" or "what types and amounts of gasses can humans breath" comes up a lot on these topics  :lol:
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19 Aug 2018 21:03

Stellarator wrote:
Source of the post the highest point (lowest pressure + lowered O2 levels) at which humans can live comfortably for an indefinite period was at 23'000 feet and 7.0649 KPa (0.069atm). That would be only slightly above the Armstrong Limit.

That's roughly as high (elevation-wise) as humans can live permanently (maybe even a bit too high), but the Armstrong limit is much higher. I think we might still be confusing the effects of total pressure vs. partial O2 pressure.

The Armstrong limit occurs at 6.3kPa or 0.06atm, or about 60,000ft altitude on Earth.  This represents where the total pressure is so low that even if breathing 100% oxygen you can't survive for very long, because the water boils away at body temperature.

Without supplemental oxygen, humans can't survive anywhere close to the Armstrong limit anyway.  That is because of the partial pressure of O2, which must be at least about 0.10atm in order to provide enough oxygen to the brain.  For example, if the total pressure is 0.2atm, then O2 must make up at least 50% of the air for you to survive.

The partial pressure of O2 in the atmosphere drops to 0.10atm at about 20,000ft, so this is roughly as high as humans can live permanently without extra oxygen, as seen with the highest settlements. :)
 
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20 Aug 2018 00:05

Found a better one, which is now officially my Earth 2.0 (Unless I find a better planet in the future).
RS 8474-1359-8-11920345-195 4:
Cold (-98 oC) desert with unicellular life;
Parent star: M1.4V Dwarf;
Rotation period Tidally Locked;
ESI (Earth simularity inxex): 0.658
Atmospheric pressure: 0.517 atm
Atmospheric comp:
O2: 93.2% (0.481 atm)
CO2: 6.76% (0.0349 atm)
CH4: 594 ppm (0.000307 atm)
C2H4: 59.4 ppm (3.07x10-5 atm)
H2S: 29.7 ppm (1.54x10-5 atm)
H2: 20.1 ppm (1.04x10-5 atm)

The air is little thin, and it might not be that comfortable to breathe, but it is still a nice place to explore, and if I had the choice, I would go on holiday to stay here for a year or two, if we could travel the thousands of light years in a short time :)

Here are a couple of screenshots of the planet:
RS 8474-1359-8-11920345-195 4.png

What do you think I should call it?
 
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20 Aug 2018 01:20

Nice find.


I found this chart and going by that it looks breathable.



nuEg1.jpg
 
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20 Aug 2018 08:16

Yep, this is a very nice find!  Congrats!  It is a bit on the chilly side though. :)

Love the screenshot of that landscape by the way.
 
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20 Aug 2018 10:31

TheRedstoneHive wrote:
What do you think I should call it?

What about "The Red Stone Planet"? :P Or how about "Terra Purpura"?
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25 Aug 2018 19:09

JKerman wrote:
Here is the full list of requirements:
Pressure above 0.3 atmospheres
Between 0.1 and 0.8 bars of oxygen
less than 0.01 atmospheres of CO2
Temperature between -80 and 110 Fahrenheit
Less than 5 ppm of SO2
Less than 50 ppm of H2S
Star mass above 0.8 Solar masses (anything less massive would have atmosphere-destroying flare-ups in real life), below 2 Solar masses
System not located in a galactic core or cluster(open or globular)
System is not multiple-star

While those are the requirements for a comfortable planet, you can still survive in more extreme environments.
It would probably be more like: 
Pressure above 0.1 atmospheres
Between 0.1 and 0.6 atms of O2
less than 0.04 atmospheres of CO2
Temperature between -90 and 50 C
Less than 10-5 atm of SO2
etc... 
 
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26 Aug 2018 15:15

TheRedstoneHive wrote:
JKerman wrote:
Here is the full list of requirements:
Pressure above 0.3 atmospheres
Between 0.1 and 0.8 bars of oxygen
less than 0.01 atmospheres of CO2
Temperature between -80 and 110 Fahrenheit
Less than 5 ppm of SO2
Less than 50 ppm of H2S
Star mass above 0.8 Solar masses (anything less massive would have atmosphere-destroying flare-ups in real life), below 2 Solar masses
System not located in a galactic core or cluster(open or globular)
System is not multiple-star

While those are the requirements for a comfortable planet, you can still survive in more extreme environments.
It would probably be more like: 
Pressure above 0.1 atmospheres
Between 0.1 and 0.6 atms of O2
less than 0.04 atmospheres of CO2
Temperature between -90 and 50 C
Less than 10-5 atm of SO2
etc... 

Well, the problem with the sulfur dioxide is that even a tiny amount in the atmosphere can be harmful over an extended period of time, and the toxicity is measured by concentration, not partial pressure. 100ppm is lethal in minutes, 50ppm is lethal in a few days, and anything above 5ppm can eventually cause permanent damage if inhaled continuously. Even down to 1ppm, it would smell pretty badly.

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