Mach 20? Mach Schnell

[tacticool]

http://blogs.wsj.com/washwire/2011/08/1 ... -of-sight/" onclick="window.open(this.href);return false;

What flies at 13,000 miles per hour, can withstand temperatures of 3,500 degrees Fahrenheit, and, apparently, is very hard to spot? The Falcon Hypersonic Technology Vehicle 2, or HTV-2, an unmanned aircraft that was launched Thursday by the Defense Advanced Research Projects Agency.

Aside from the idea of DARPA tweeting, it sounds very cool.

Official site: http://www.darpa.mil/Our_Work/TTO/Progr ... HTV-2.aspx" onclick="window.open(this.href);return false;

[threoh8]

Doc Brown found it in 1955.

[sjfcontrol]

Doc Brown found it in 1955.

That speed would take it back to the Pleistocene epoch.