Boom Supersonic broke the sound barrier in late January with its XB-1 ... the shifting density of air as an object moves ...

NOVA: The obstacles to breaking the sound barrier were the aircraft design itself and the building of a propulsion capable of pushing a plane that fast. Would you say that those were equal challenges?

and that is the rattle that you're getting now, the barrier of the speed of sound, as we come up to it now, at an indicated height…an indicated speed of over 500 miles an hour which is very much ...

ENFIELD — A motorist lost control of their SUV while traveling on Interstate 91 south before going off the roadway and striking a wooden sound barrier, according to police. Connecticut State ...