you can have an enclosed space with a lack of airflow as to cause condensation when humidity reaches a threshold. a bit anecdotal but i know a person who knew a person who went complete overkill on the insulation and filling every seam in the house he built. it rains in the living room every time they do laundry. the dome of new Pittsburgh is probably little with small stalagmites to encourage condensation to drip down into the city rather than run down the arched walls,

If they wanted it to Rain, then yea, I think it would be luxurious spending for that hab but it feels within the capability of EP tech. But to say that it happen as part of the structure volume and humanity, that hard to say yes or no without getting way more exact details.

Tzimize wrote:

There is a very famous myth that in the hangar of the nasa it rains, but it is false.

It is not a urban legend nor a myth. It was an actual problem stemming form Florida hot, humid climate and use of air conditioning inside the Vehicle Assembly Building. Hot air was entering the building and then rising to the upper parts of it there mixing with the output of air conditioning it was cooled beyond its dew point. In effect you got a lot of condensation and moisture, which could be hardly classified as rain but it was certainly detrimental for all the machinery held there. It has long since been corrected. The biggest hangar in the world (IIRC located in Pitsburgh) was without any air conditioning to prevent the same problem. It is not stretch to imagine that a habitat of sufficient size could be designed to enhance such effects instead of preventing them. Rain is after all something that most od humanity doesn't experience outside of the simulspaces for most of the time. It would require masterful use of fluid dynamics on a mass scale and tremendous energy expenditure to control it but in essence it would be just a giant condenser, maybe shaped like inverted grass/lawn, which would be kept at a temperature few degrees below the temperature of the rest of the dome. All the rising hot air would carry moisture that condensed on the ceiling. Due to the complicated nature of the system rain would be chaotic. Question: Is Mars terraformed enough to have rains? Disclaimer: My grammar may be terrible but I hope you all understand me :-)

Maybe there is condensation on canyon walls of Noxis.

I'd say it's definitely feasible and could be both either a pre-designed feature or a result of an unaccounted oversight partially mitigated by some later fixes and rework. However, dealing with the effects of humidity on such a large scale and all the life that tries to develop there is going a major pain in the are of local life support crew. You even could probably base a few stories around this: Some local(?) Anon(s) once boasted that they though up a way to spike the whole system and make the rain 'happy'. Recently they has gone silent. Maybe it wasn't just idle chatting.... Drunk men tend to talk about their jobs and often far more than they are willing to say with a sober mind. On a routine party a friend of friend was a bit more drunk and grumbly than usual. Apparently, the common mold has become surprisingly persistent lately, and even cleaner nanoswarms have to take extra time and effort to remove it now. The higher-ups are, as always, reluctant to acknowledge any any problems...

Well, it was a misunderstanding then. Your statement about the rain being a myth coupled with your uncertainty about the drizzle in Pittsburgh gave me the idea that you disbelieved the idea at all. In the case of NASA hangar: the moisture tends to condense on already existing objects and can be sort of metastable if such are not present. That's why seeding clouds with dust, or fireworks, gives us the rain. In the hangar the alreadyexisting objects were all the equipment and such. So it probably never was anything more than annoying dripping, annoying for humans, less healthy for machines. Pittsburgh is just a case of much larger scale and of course transhuman engineering