The Twitter feed from the Defense Advanced Research Projects Agency (DARPA) said that the agency lost track of its hypersonic Falcon HTV-2 aircraft during its second and final test flight Thursday. The Falcon HTV-2 was said to reach Mach 20 or 13,000 miles per hour during its 9-minute flight before it disappeared and presumably plunged into the Pacific. At this speed, the aircraft could travel from New York to Los Angeles in under 12 minutes. Its purpose is to provide the military with the ability to strike anywhere in the world within an hour.
Check out the CBS News story for current updates.