The US Air Force completed a nearly decade-long test program this week with the successful launch of an unmanned aircraft into hypersonic velocity, flying at more than five times the speed of sound. Air Force officials announced Friday that the X-51A WaveRider flew for more than three minutes Wednesday, a one point hitting a speed of Mach 5.1, according to the Associated Press. The successful flight... 

Graphic shows the X-51A Waverider as it is set to demonstrate hypersonic flight. The US Air Force confirmed on Wednesday that the test mission one day earlier of an unmanned hypersonic plane hoped to travel at six times the speed of sound was a failure. The Pentagon revealed on Wednesday that Tuesday’s test run of the X-51A WaveRider aircraft was unsuccessful. “It is unfortunate that a problem...