DARPA’s space plane project

Interesting. DARPA projects have a way of coming true.

“Key XS-1 technical goals include flying 10 times in 10 days, achieving speeds of Mach 10+ at least once and launching a representative payload to orbit. The program also seeks to reduce the cost of access to space for small (3,000- to 5,000-pound) payloads by at least a factor of 10, to less than $5 million per flight. “

(Via DARPA trying to make a Mach 10+ unmanned spaceplane that can fly ten times in ten days.)

What is most intriguing to...