In honour of this being our forty-second posting, Frank insists on mentioning HHG2G and how it influenced his education. All right, so I mentioned it. Now we can continue, right?
Some folks investigating how the Door works have suggested that the wormhole effect isn't so much a connection between different points in space, but rather they say that it connects the same point in space, but in a different time. In other words, it's connecting two points in four-space that just happen to have the same x, y, and z values. Frank is convinced that it couldn't possibly happen that way, and his biggest argument is the one espoused by Steven Hawking: We don't see tourists from the future time travelling back for a quick jaunt. Of course Carl Sagan has an alternative viewpoint on that argument: The tourists from the future are very careful to blend in so that no one notices them.
Either way, bringing in big names like those is just Frank's way of name-dropping, so don't pay any attention to him and his head won't swell too much.