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Planets with potentially breathable atmospheres

Posted: 28 Nov 2017 10:33
by ORWO
that SO2 kills me :(
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Planets with potentially breathable atmospheres

Posted: 28 Nov 2017 11:34
by Gnargenox
Yeah :(, other than that, you certainly found one very similar to our own atmosphere! I think the SO2 should be toned down a bit  in the next version of SE. But then again, in reality, how many possible planets could even have enough O2?

Planets with potentially breathable atmospheres

Posted: 02 Dec 2017 06:46
by ORWO
Another close call:
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Planets with potentially breathable atmospheres

Posted: 02 Dec 2017 15:01
by ORWO
Seems to be my lucky day.How about these ones?:ImageImage

Planets with potentially breathable atmospheres

Posted: 03 Dec 2017 01:33
by Watsisname
Too much SO2 on both, but otherwise they're good!  The O2 pressure on the first planet is also very close to the lower limit of survivability, while the O2 pressure on the second planet is very close to the upper limit.

Planets with potentially breathable atmospheres

Posted: 05 Dec 2017 23:34
by Gnargenox
A Warm Terra, (with 3 more planets behind that support life too!), that is breathable for a few minutes. The fraction of inspired oxygen (FiO2) is around 60%, the preferred flow rate of oxygen for humans to breathe, even with low atmospheric pressure like this.
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Planets with potentially breathable atmospheres

Posted: 05 Dec 2017 23:41
by Watsisname
Death in a few minutes would be okay just for the sweet view of those rings in the sky.

Planets with potentially breathable atmospheres

Posted: 06 Dec 2017 08:35
by Mouthwash
I can't believe I didn't realize all this information was available until now.  :shock:

To be clear, there is no way to see what liquids are supposed to be in the current version, right?

Planets with potentially breathable atmospheres

Posted: 06 Dec 2017 17:31
by Gnargenox
The new planet classification system code will include a fairly complete chemical composition progressive algorithm, that not only computes the atmosphere, but the seas/oceans and frozen ices as well.

Alien Seas - Space Engine blog

Planets with potentially breathable atmospheres

Posted: 06 Dec 2017 20:15
by Ragni
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Out of all the planets iv'e seen this one seems the most survivable, how many seconds could you survive on this planet?

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Edit: Right after I posted this I found another probably unbreathable but still nice planet, so how lethal is it?

Planets with potentially breathable atmospheres

Posted: 06 Dec 2017 21:41
by Watsisname
Ragni, Establishing such an exact survival time is impossible, because different people have different responses.  But we can ballpark it and get a rough idea of how bad it is.

First planet:  The biggest offender is the SO2 at 0.0027atm partial pressure.  That's equivalent to 2700 ppm concentration at Earth surface pressure, and is 27 times greater than the level considered "immediately dangerous to life and health", with death possible within an hour.  Few cases of acute exposure at concentrations this large have been studied in which the concentrations were known.  But I think it is safe to say that your demise due to exposure on this planet would be fast and also very unpleasant.

Ignoring the SO2, the next greatest issue is the low partial pressure of O2.  At 0.09atm, this is like being at about 7000m (23000ft) altitude on Earth, which requires a long period of acclimatization.  Being immediately introduced to this oxygen concentration would cause you to pass out within about 5 minutes.  Even with acclimatization, most suffer effects of high altitude sickness, and their health may slowly deteriorate.  Some deteriorate or even die quite suddenly; victims of HAPE or HACE.

Second planet:  The oxygen pressure on this world is well within the breathable range.  But what is definitely not in the breathable range is the CO2.  At 0.29atm, this will kill you in minutes.  So will the SO2.