Last summer, the Pentagon's Falcon HTV-2 glider—which the Air Force says can fly from New York to LA in under 12 minutes, disappeared. Nobody knew why! Now we know why: it went so fast it ripped itself apart. More »
The Air Force's Falcon Hypersonic Technology Vehicle 2—designed to attack global targets at Mach 20—has disappeared nine minutes into its first test flight, just after separating from its booster. Contact was lost, and it hasn't been found yet. More »