I was curious and went to look up how low it was, and the references I can find online say that the ISS, the Space Shuttle, and the Crew Dragon are all at 1 atm.
It does say that the pressure in the Space Shuttle was decreased to about 70% atm for 24h before EVA.
This is actually a terrible idea, because to keep the air breathable you'd have to raise the oxygen fraction, making fire risk much worse. (Inert gases in air suppress fires by carrying away heat, making it harder to sustain a flame.)
There’s only one atmosphere of pressure from inside to outside. Under the sea the direction is reversed and pressure is much higher.
Spacecraft are pressurized to much less than one atmosphere, because it reduces the stress on the craft, and the weight of the air supply.
I was curious and went to look up how low it was, and the references I can find online say that the ISS, the Space Shuttle, and the Crew Dragon are all at 1 atm.
It does say that the pressure in the Space Shuttle was decreased to about 70% atm for 24h before EVA.
Apollo was 1/3 atm 100% oxygen.
https://en.wikipedia.org/wiki/International_Space_Station
https://space.stackexchange.com/questions/5690/why-is-the-br...
https://www.google.com/search?q=pressure+inside+the+space+sh...
https://www.google.com/search?q=pressure+inside+the+apollo+c...
Likewise commercial aircraft.
This is actually a terrible idea, because to keep the air breathable you'd have to raise the oxygen fraction, making fire risk much worse. (Inert gases in air suppress fires by carrying away heat, making it harder to sustain a flame.)
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Fry: "How many atmospheres can the ship withstand?" Professor: "Well, it's a spaceship, so I'd say anywhere between zero and one." s02e12
The one atmosphere that telescopes are looking through. It is nowhere near as problematic as looking through seawater.
But space telescopes exist where you don't have to deal with one atmosphere.
This is about sub sea pressure where it reaches a thousand atmospheres. So a space telescope in zero atmosphere doesn't help.
futurama comes to mind. the spacecraft can withsthand any level of atmosphere between 0 and 1