Space isn't so much hard as it is expensive. Humans have put objects into space with rockets since Sputnik in 1957, but rockets are still largely a one-off proposition, a powerful single-shot thrust into space that falls away into unsalvagable parts. DARPA, the Pentagon's far-looking research wing, wants to change that. With their XS-1 program, they've set an ambitious goal for companies to create a vessel that can go into space 10 times in 10 days, with each flight costing less than $5 million. Ambitious as it is, DARPA is so confident in this program that they've funded the second stage in their design competition.