Hypersonic
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How Will the U.S. Military Stop Hypersonic Attacks? Space-Based Missile-Killer Systems
The X-15: America's Speedy Rocket Plane Nearly Broke Mach 7
The Mach 5 SR-72 Spy Plane Could Already Be Flying (Maybe)
Mach 6.7 Monster: How America's X-15 Plane Is Still a Record-Breaker
The X-15: How a Record-Setting Flight Almost Ended in Disaster
Stories From Hypersonic
