That moment when sound itself concedes defeat.  Like waves building at the bow of a moving boat, pressure waves in the air begin to stack and compress until Mach 1 (approx. 761 mph (1,225 km/h) at sea level, 68°F (20 °C).  As an object travels beyond this speed, the waves compress until they can't get out of their own way, merging into a single shockwave cone, and the results can be spectacular.

Via: interfacelift

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