Yeah, all the pressure of sunlight hitting the hull.
Unless you're in a nebula, there is no pressure. And even then, with no real central source of gravity (even though there is one, any nebula worth its salt hasn't turned into a star yet) its just free-floating gases held together by a small condesation of gases in the middle-ish of the cloud.
Thus: no pressure.
I'm no astro-physisist, but to say there's pressure in space is just silly. This is my thought process on the matter.