A short video turned to me with the technique of time-lapse (lapse) shows, at 125 times normal speed, the evolution of a contrail left in the area of \u200b\u200bLugano May 20, 2009 between 5:50 and 7 am. It 's interesting to note that the trail is transported smoothly from high altitude winds, without unraveling or deform dramatically. In other words, it behaves exactly like the clouds in the same proportion seen in the video.
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