![Bullet planes, fatal crashes – and the top secret British project to break the sound barrier first | National Geographic Bullet planes, fatal crashes – and the top secret British project to break the sound barrier first | National Geographic](https://static.nationalgeographic.co.uk/files/styles/image_3200/public/nasm-a19510007000_nasm2015-07347.jpg?w=1900&h=1267)
Bullet planes, fatal crashes – and the top secret British project to break the sound barrier first | National Geographic
Ed Piotrowski WPDE - Cool photo of an F-18 fighter jet breaking the sound barrier. The speed at which you break the sound barrier is roughly 770 mph but the exact speed
![Why was the “sound barrier” ever considered a barrier in the first place? What is it about the properties of air that made achieving supersonic flight such a heralded feat of aerospace Why was the “sound barrier” ever considered a barrier in the first place? What is it about the properties of air that made achieving supersonic flight such a heralded feat of aerospace](https://qph.cf2.quoracdn.net/main-qimg-a02df008d1c0a88ae3dda3400ea17826.webp)