Under the right conditions, fighters, bombers, Saturn V rockets cause these spectacular clouds. And during Discovery's July 26 launch, it too made a
Prandtl-Glauert condensation cloud.
Video details at Linkfilter.net, "Space Shuttle Discovery generates a Prandtl-Glauert cloud": linkfilter.net...
Short writeup on Boing Boing, "Shuttle makes spooky-cool Prandtl-Glauert condensation cloud": www.boingboing.net...