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Originally Posted by ASWnut101
I can remember this stuff since I was a kid.
About half of the pictures they show are Airplane Contrails, also known as Condensation Trails (which is simply the exhaust of the big jet airliners' engines and the wingtip vorticies).
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Also sometimes called vapor trails.
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In addition, condensation trails behind aircraft have displayed characteristics attributed to "chemtrails" since the 1930s development of high-altitude planes. As these vapor trails are created in the exhausts from engines, they contain not only hot gases but also microscopic droplets of oil and every other component of the fuel, including traces of lead (in fuel used by piston engines), which can break light into various colors. This phenomenon is observed in sundogs, which have been seen throughout recorded history.
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I would also add that what actually happens is the moisture in the colder air condenses on the hot air coming from the exhaust. It's the exact same phenomenon you see forming on a cold glass on a hot day...or are they putting chemicals in our ice cubes?
http://www.borderlands.com/contrails/contrail.htm
Bomber Contrails, WW2 (you need to scroll to the very bottom, 3.10.2001, then click on the picture to enlarge).
http://www.skylighters.org/potd/index.html