Space is the empty area between objects gravitational fields
Gas pressure is things bouncing off walls/eachother.
So they bounce until they find an area where they can be free (there’s no walls in [space]). The only thing that could slow them down is gas resistance (other things to bounce on) but there aren’t many particles chilling in space because of the vacuum
It’s a vacuum because the particles are slowly getting sucked to the nearest source/strongest source of gravity
So to answer your question: after being expelled from the space craft, their journey will likely lead them to another gravitational object one day (or in orbit, where they will inevitably sink in
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