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Planets with potentially breathable atmospheres

Posted: 26 Jul 2017 21:43
by Gnargenox
Yes indeed, very breathable :) Good find!

Planets with potentially breathable atmospheres

Posted: 27 Jul 2017 03:50
by TypicalPerson
I know this isn't a picture of a planet, but for reference I'll post the boiling and melting point of some toxic and nontoxic gases (at standard pressure).

N2 boils at 77.35 K (-195.8 °C, -320.44 °F) and melts at 63.15 K (-210 °C, 346 °F)
O2 boils at 90.15 K (-183 °C, -297.4 °F) and melts at 54.35 K (-218.8 °C, -361.84°F)
SO2 boils at 263.15 K (-10 °C, 14 °F) and melts at 200.45 K (-72.7 °C, 98.86 °F)
H2S boils at 212.45 K (-60.7 °C, -77.26 °F) and melts at 187.65 K (-85.5 °C, -121.9 °C)
CO2 boils at 195.15 K (-78 °C, -108.4 °F) 

Planets with potentially breathable atmospheres

Posted: 27 Jul 2017 07:41
by Cantra
Ah, excellent!

I've found 3 so far I think. 

Planets with potentially breathable atmospheres

Posted: 27 Jul 2017 08:42
by Hornblower
TypicalPerson, the problem is, most planets are not at standard pressure

Planets with potentially breathable atmospheres

Posted: 27 Jul 2017 17:25
by Gnargenox
Thanks TypicalPerson. I am always wondering at what temperature and pressure on a planet that gasses would condensate or freeze at. As I mentioned before, the partial atm pressures of gasses list on the info tab already take this into account and the numbers you see are still the real amounts in the atmosphere. No need to calculate a new, different percentage based on temperature of the planet.

What you need is a simple Phase Diagram for each of the gasses. Pressure on one side, temperature on the other axis. Or you can try to find an online calculator for such, but I haven't found an easy one yet. Here is an insanely complicated software program than might be able to do gas phase calculations for very low atms. PHREEQC

Here is an interactive gas phase chart for CO2: CO2 phase chart

Io, the innermost of the four Galilean moons orbiting Jupiter, is the most geologically active body in the solar system. Its surface is covered with a frost of solid SO2. The atmospheric pressure on Io is 10–7 atm and the surface temperature is between 90 and 110 K (–183 to –163 °C). Here is an SO2 phase diagram. (I don't know what the red dots mean).
SO2 Phase Diagram.jpg
SO2 Phase Diagram.jpg (53.9 KiB) Viewed 2898 times

Planets with potentially breathable atmospheres

Posted: 28 Jul 2017 01:25
by TypicalPerson
So, I did a search for temperate terras with organic life in an addon galaxy, and I found this planet:
scr00052.png


It is breathable aside from the CO2, at 0.0976 bar (9.76 kPa), which means you'd stay conscious for a few minutes

Planets with potentially breathable atmospheres

Posted: 28 Jul 2017 01:47
by elemental
Experts, do hydrocarbons ruin this party?  :( This planet is SO2 free :(
scr00043.jpg

Planets with potentially breathable atmospheres

Posted: 28 Jul 2017 02:09
by Watsisname
The hydrocarbons are fine, but alas, the H2S ruins the party.

Planets with potentially breathable atmospheres

Posted: 28 Jul 2017 02:21
by elemental
NOOOOOOOOO completely 0% SO2!!!!!

O2 and CO2 also fine?

Planets with potentially breathable atmospheres

Posted: 28 Jul 2017 02:54
by TypicalPerson
elemental The O2 is very close to Earth. The CO2 isn't deadly, but it can cause shortness of breath.

Planets with potentially breathable atmospheres

Posted: 28 Jul 2017 11:41
by Gnargenox
Great try though :) You're getting very close to having your very own breathable planet! (There's plenty to go around)

Planets with potentially breathable atmospheres

Posted: 30 Jul 2017 12:23
by Gnargenox
I thought this was a neat find while searching for HIP planets that are breathable. Still a bit too much SO2 to be breathable (by 8x), but there's enough O2 and pressure, not too much CO2 or H2S, but what's cool is it is a binary planet & "moon" BOTH with life and they have beautifully contrasting ocean colors. Two different species of life, perhaps not even related, or perhaps they actually colonized their liquid water moon or vice versa.
scr04751.jpg

Planets with potentially breathable atmospheres

Posted: 06 Aug 2017 22:41
by LordKvasir
These atmospheres have too much CO2 and SO2 to breathable

Planets with potentially breathable atmospheres

Posted: 13 Aug 2017 23:37
by Jackdaw
Finally got this! 
scr00010.jpg

It's found by a Chinese player called Sakuraso. 
The only problem is that it's too hot on it! 

Planets with potentially breathable atmospheres

Posted: 14 Aug 2017 04:36
by akorn
Jackdaw wrote:
Finally got this! 
scr00010.jpg
It's found by a Chinese player called Sakuraso. 
The only problem is that it's too hot on it! 

The planet is tidally locked. So there will be very hot areas and very cold areas. There could be areas in between with a permanent comfortable temperature, so that's maybe not the the biggest problem here! 
The gravity will be limiting, since you'll feel abuot 1.7 times heavier on the planet. But that's acceptable as well. 
The level of SO2 is very unhealthy if not deadly.
And the level of oxygen in insufficient. 14% O2 would be low but breathable here on earth. But on this planet you have only half of the air density comparred to Earth. So total oxygen is even lower.
Nice planet though!
Back to hunting :-)