B-2 Going Supersonic

The Daily Mail says:
...It is a pretty cool shot of a plane that few ever get to see in flight including the enemy.The Stealth Bomber's ultra-streamlined modern design ensures there is only a minimal shockwave as the pilot accelerates beyond the speed of sound.
The cloud effect is caused by a vapour cone also known as the 'Prandtl-Glauert singularity'.
It appears when there is a sudden drop in air pressure around aircraft travelling just above or below the speed of sound.
These condensation clouds, also known as 'shock collars' are frequently seen during space shuttle launches but their precise nature is still under debate.
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