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Planets with potentially breathable atmospheres

Posted: 16 Jun 2019 01:17
by Stellarator
JKerman, that planet does not have a breathable atmosphere for humans. The O2 pressure is too low (without significant adaptation to the lower pressure) and the CO2 content would be lethal for prolonged exposure. Plus the average temperature (73C) would make the surface uncomfortable to walk on without some thermal protection.

Planets with potentially breathable atmospheres

Posted: 16 Jun 2019 08:13
by donatelo200
Stellarator,  The CO2 is low enough (barely) and he has the temperature in Farenheight so the planet is actually only slightly warmer than Earth at 23C.  The Oxygen is enough but again barely and most people would struggle.  So this planet has a breathable atmosphere but it would certainly not be comfortable.

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 07:17
by TonioDeter
You guys should read the first post of this topic before calling an atmosphere breathable. You forgot to take the SO2 into account, its pressure has to be below 5.10^-6 at worst, and below 1.10^-6 to be comfortable.

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 07:58
by Canleskis
TonioDeter wrote:
You guys should read the first post of this topic before calling an atmosphere breathable. You forgot to take the SO2 into account, its pressure has to be below 5.10^-6 at worst, and below 1.10^-6 to be comfortable.

I was realizing that as well some days ago after looking more into details on the planets posted here. I still haven't found any that has suitable SO2 levels, the search is still going I guess.

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 08:24
by TonioDeter
I didn't search for hours in 9.9.0, yet I found one terra with a (almost) perfect atmosphere for humans :
https://imgur.com/a/qRISgbU

It seems you have better odds to find decent levels of SO2 in 9.9.0. Now I often find terras (with enough O2 and tolerable CO2) where SO2 pressure is between 10^-6 and 5.10^-6 atm, though I'm not sure this kind of level would be ok for a long term breath (in addition to the smell).

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 09:43
by Canleskis
Also this planet is quite hot, not sure how we would adapt to such temperatures. I have also found kind of breathable atmospheres but there is always one little thing that's isn't right, making the planet suitable for humans but not quite as Earth, which I guess is what we are looking for.

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 10:13
by TonioDeter
Yes, it's hot but most importantly there is no water on it ! I wonder how pluricellular life managed to develop here.

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 12:40
by Julian
Does it seem like 0.990 has made it much harder to find truly Earthlike planets (temperate marine terras with multicellular marine and terrestrial life in non-tidally-locked orbits around G-type stars)?

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 17:19
by donatelo200
That is because it is.  It is supposed to be.  Truly marine planets like Earth are quite rare due to the narrow bulk makup required for them.  Nature tends towards global oceans or dry to lakey terras rather than marine worlds.  That said, however,  they are not to hard to find with the correct filter settings.

Planets with potentially breathable atmospheres

Posted: 17 Jun 2019 17:22
by donatelo200
TonioDeter wrote:
You guys should read the first post of this topic before calling an atmosphere breathable. You forgot to take the SO2 into account, its pressure has to be below 5.10^-6 at worst, and below 1.10^-6 to be comfortable.

I generally ignore SO2 as SE seems to have far too much of it in the first place.

Planets with potentially breathable atmospheres

Posted: 18 Jun 2019 02:28
by TonioDeter
[b][color=#969696][size=100][font=Roboto, sans-serif][color=#eedd00]@ [url=http://forum.spaceengine.org/memberlist.php?mode=viewprofile&u=274]donatelo200[/url] [/color][/font][/size][/color][/b]The only explanation about SO2 I can think of is that planets seem to have high volcanic activity in general in SE, but yeah he (or they) should fix this SO2 problem for better realism.

And as Julian said I also find it odd now that terra with oceans have most of the time really high atmosphere pressure and are tidally lock, I don't see the link between those two characteristics and the presence of water on the planet's surface.

Planets with potentially breathable atmospheres

Posted: 18 Jun 2019 03:42
by donatelo200
High pressures would tend to "leak" liquids to a planets surface not to mention make the liquids far more stable.  So, high-pressure worlds having more liquids than lower pressure worlds makes sense in general.  There are obviously exceptions but as a general rule the higher the pressure the more likely a planet is to have liquids.

Planets with potentially breathable atmospheres

Posted: 19 Jun 2019 19:38
by Julian
What are the most Earthlike worlds you've found in 0.990? RS 8496-946-7-1778819-783 A4 is the best looking one in the Milky Way I've seen so far, although as usual there's too much sulfur dioxide, and greater than 0.5 atm pp oxygen is borderline unsafe:

Image
Image

(I modded eng-gui.cfg to replace "Procedural (generated) object" with "Procedurally generated object".)

Planets with potentially breathable atmospheres

Posted: 20 Jun 2019 13:42
by donatelo200
Oh here are some nice ones.
scr00029.jpg

scr00027.jpg

scr00026.jpg

scr00035.jpg

Edit: Bonus blue terra
scr00037.jpg

Planets with potentially breathable atmospheres

Posted: 08 Aug 2019 20:21
by Space Nerd
I found one with not enough O2, one with TOO much O2(and pressure), and one with too much SO2.