Terraformed Planet with life - Temperature of 345 degrees kelvin? HUH?

[Saool]

There are a few planets out there with "human breathable atmospheres". Which I would say "Sure, you can breath them, but they will kill you if you do".

For example 'Badfort' in my home system is a terraformed earth-like. The atmospheric composition is pretty good, but it has a pressure of 6 atmospheres. The pressure is not the problem. People can withstand more than 6 atmospheres without too much trouble. The problem is that both Nitrogen and Oxygen become highly toxic at anything greater than 3 atmospheres, unless to also add Helium to the mix (this is diving stuff). So unless people are using breathing masks that mix in helium, there is no way it is human breathable.

That's before we think about how sound is effected at 6 atmospheres. You would NOT want to be anywhere near a thunderstorm! Which is bad as by in large, it has a tropical climate.

 

[marx]

@ Sapyx: note that in the majority of non-procedurally generated systems, it's only the stars themselves that aren't generated but manually inserted (from various catalogues), and not the rest of the system. This counts for inhabited systems in the bubble as well. If this going over the limit (you are right, by the way, the range is 260-320 K) is a bug, then it's not due to planets being manually placed in wrong orbits. But it's more like that the end result of the terraforming is off.

Epsilon Indi has manually placed bodies though. Pretty much everything that came over from FE2 and FFE is.


@ Saool: It's not just the atmospheric pressure that counts, but also the atmospheric composition. When viewing the effects on the human body, you want the partial atmospheric pressure of a given component, which is the percentage of the component multiplied by the atmospheric pressure. When it comes to natural Earth-likes, the Stellar Forge has rather strict criteria for the atmosphere to be classified as breathable - but it appears that these too go right out of the window when the planet is a terraformed world.

The highest atmospheric pressure for a natural ELW that I know of is Greae Hypai EC-W b43-4 2, at 4.56 atm. The composition is 77.6% nitrogen (3.54 atm), 18.9% argon (0.86 atm) and 3.5% oxygen (0.16 atm). Hm, looking at that now... The oxygen appears fine, but 3.54 atm nitrogen partial pressure would lead to mild nitrogen narcosis, no? Also, isn't that argon level too high? I remember hearing that as far as inert gases go, argon is considerably more narcotic than nitrogen.
If so, scratch what I said about rather strict criteria above.

Oh, and the effect of sound in thick atmospheres is something I've never considered before. Thanks for the idea!