Quote:
Originally Posted by Hack&Lube
That's actually condensed air and vaporizing moisture from the sonic boom.
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Leave out the sonic boom part, you don't need a sonic boom to have those. They're called Prandtl–Glauert condensation cloud or a Prandtl–Glauert singularity.
http://en.wikipedia.org/wiki/Prandtl...rt_singularity
http://web.archive.org/web/200705102...ert-clouds.htm
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