Hypersonic speeds are defined by those exceeding Mach 5, and lately there’s been a lot of buzz about unmanned hypersonic vehicles making test flights. Vehicles returning from orbital flight also ...

Sierra Space and Radian have developed spaceplanes that reach almost 18,000 mph for entering orbit and visiting private space ...

Venus Aerospace is building a hypersonic aircraft that can carry about a dozen passengers, traveling at Mach 9, nine times the speed of sound. The Stargazer, ...