The Curiosity of Contrails
You may not have realized it, but if you look up on a clear day you will likely see a man-made cloud somewhere in the sky, trailing behind jet aircraft high up in the atmosphere. Contrails, short for condensation trails, are formed from the water vapor found in aircraft exhaust as a byproduct of fuel combustion. Natural clouds form from the same process of water vapor condensing in cool air as it rises, so technically contrails are clouds, just from an unnatural source.
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