Vasek: We know if you take general relativity to its extreme, you're basically dividing by zero or doing something that doesn't work out on paper. Is there a stopping point that you can say, general relativity stops here? The Planck length is 10 to the minus 33 centimeters. That's a very small number. And how would you then manipulate something like this? If you have empty space and you could heat it up, heat up empty space to the Planck temperature, then bubbles will begin to form. In fact, that's probably where our universe came from. Our universe probably came from a bubble in nothing that expanded, giving you the big bang of today.