I think commercial space travel is critical. We're not really going to do much in space at all until the price to low-Earth orbit gets driven down. Right now it's just so damn expensive, there's no economic incentive to go into space. So any missions are just governments spending money they're not going to recoup. But if you can drive down the price, then there will be a commercial space enterprise and economics will see to it from there. If you can imagine a scenario where, for $50,000 you can go into space and spend a week on a space hotel, like a space station. And the whole process were as safe for you as international [air] travel is today. I think people would be lining up to do that. There would be infinite demand.