no, not a rock lyric: something done by airplanes.
An airliner gaining altitude punches through the cloud layer, and leaves behind a void as if by a circular cookie-cutter... The ice particles grow at the expense of the supercooled water droplets and fall out of the cloud as snow. If the cloud layer is thin or if the water is not replenished the snow leaves a hole in the cloud.
headsup Spaceshuttlenews
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