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![]() ![]() "So during the Second World War, militaries tried to avoid contrails because they wanted to avoid visibility of their aircraft." "They make aircraft visible, you can see the trace of a flying aircraft," says Schumann. Some did consider whether they occurred due to super-saturated water vapour, but this was dismissed as it was thought that too little water vapour was emitted.įiguring out the causes of contrails didn’t become much of a concern until World War Two, when contrails were first viewed as an issue. Early theories proposed they were vibrations from the plane's engine or effects from electrical charges. Following the initial observations in the early 20th Century, the exact cause of these plane-trailing clouds remained a topic of debate for several decades, says Ulrich Schumann, professor of atmospheric physics at the German Aerospace Center (DLR). ![]()
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