The U.S. military is hoping that the fourth time will be the charm when it comes to its experimental hypersonic flight program, following a third failed attempt to achieve Mach 6, according to a report from The Associated Press. Once a year since 2010, the Air Force has conducted a test of the unmanned, experimental X-51A Waverider aircraft, the most recent attempt coming two months ago... To continue reading, subscribe to Science Recorder today.
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