2016年5月23日 星期一

This rocket could change travel ... and war


A rocket went up over the Australian desert on May 18, but this successful test launch was no ordinary feat: The experimental rocket hit a speed of Mach 7.5—or 7.5 times the speed of sound—qualifying it for "hypersonic" status, reports Gizmodo.

via FOX News http://ift.tt/1WNsufY

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