This cone-shaped shock wave wouldn't be a problem if it lost its strength as it moved away from the plane. But it doesn't. With conventional supersonic aircraft, it maintains most of its shape all ...
"You have a supersonic shockwave that is travelling through the air, and you can see that in the white spherical cloud which travels out from the centre, expanding upwards," says Prof Sella.
A shadow from the shockwave ahead of the ball can be seen ... but because it’s a great demonstration of supersonic flow phenomena. Video after the break.