Wow. So many people. So many slightly flawed views of the universe. The bottom line is that there ARE black holes. They don't necessarily go anywhere. No one knows what they do. They're probably like cornicopeas (sp?) that don't have an opening at the end. Why should they? Because they do in Sci-fi shows like Farscape? The bottom line is that as you compress matter, the volume it takes up is decreased. This changes its state of matter, going from plasma to gas to liquid to solid to... well it's going to have zero mass... then you have negative mass. But you can't have negative mass. This is the point at which theorizing is pointless. So why should it be a "worm hole?" Because humans like to believe that they can warp space to get out of their pathetic solar system. Other examples of these romantic notions are time travel movies where you can tamper with time and make yourself disappear. The bottom line is that the SECOND you're in a previous time, you've changed history. It's all silly, really.