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An aircraft contrail is a mixing cloud caused by the emission of hot gases
and water vapour into the atmosphere by jet engines. In this case the contrail
is casting a shadow onto cirrus clouds below. In order to reinforce something
important that is widely misunderstood by some people, there are no
chemtrails. Every contrail that you see is indeed artificially created but
the process is not sinister or mysterious.
Large version of this image.
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Last Modified: April 04 2019 13:45:54.