writes "Three months ago, astronomers announced the discovery of a large hole at the edge of our universe. Now, Dr. Laura Mersini-Houghton thinks she knows what that means. (Subscription req'd at New Scientist site, there's also an overview here.) According to string theory, there are many universes besides our own. Her team says that smaller universes are positioned at the edge of our universe, and because of gravitational interactions, they can be observed, and they're willing to make a prediction. The recently discovered void is in the northern hemisphere. They contend another one will be found in the southern hemisphere."