If a flat, fully sealed balloon is in space, could you pull the walls apart quite easily apart from the elastic force? In other words, will a balloon go from flat to "filled with a vacuum" if it's in a vacuum? I'm thinking because there's a vacuum outside the balloon, there's nothing to "push" the walls of the balloon together and they should separate easily (aside from the elastic) but my gut says that's not possible. This is of course purely hypothetical and assumes a perfect vacuum and perfectly flat balloon etc
This is a very similar question below and has a nice answer which is kinda saying "nothing is not nothing because of quantum physics" but I feel the question was really just about the "inside" of a cube where my question is more about the inside and outside: given they're both equal/no pressure, then can the walls of the balloon move freely?