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Holey Clouds: Gallery of Formations Cut by Airplanes

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Heavenly Mystery

Credit: H. Raab User:Vesta
For decades, people speculated why strange gaps like this one, observed in 2008 over Linz, Austria, appeared in clouds. In 2010, researchers showed how airplanes might be responsible.
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Wynne Parry

Wynne was a reporter at The Stamford Advocate. She has interned at Discover magazine and has freelanced for The New York Times and Scientific American's web site. She has a masters in journalism from Columbia University and a bachelor's degree in biology from the University of Utah.
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