I might not be up on the latest but it seems like many people believe that the universe,or not nothing, starts at a point in what is now time. I think something like 15,000,000,000 years ago? And I think people believe that it started at a certain point in what is now space. So by that model, if you had a vehicle that could travel fast enough, say 100,000,000,000 times the speed of light or more, couldn't you travel past the outer edge of something, the universe, and into nothing. You would be in whatever existed before something. It seems like you would be in endless nothing except you and your vehicle.