so the universe will explode inward someday, could we prevent this by taking giant vacuums, switch them to reverse, and expand the universe?
how can you switch nothing to reverse ?? You're just being silly.
Are you talking about vacuum *cleaners*? Calling one a vacuum is just a diminutive colloquialism. You did know that didn't you? You are correct, though, in that the vacuum is something that can be expanded as opposed to the nothing that those who take it for granted assume it to be. It has properties like length, width, breadth, and time, which all inflated during by the Big Bang, and are expanding still. Nothing, by contrast, has no properties.
