Ezeket mi csinálta, srácok? (Forrás: spaceweather.com)
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The sky is full of mysteries, and one of them appeared over Wisconsin two days ago. "I live in Stevens Point on the University of Wisconsin campus, and I saw some very strange clouds," reports Samantha Weise. She took this picture

These are "hole punch clouds," and no one is certain what they are. One theory holds that hole punch clouds are formed by jet airplanes punching through a cirrocumulous cloud deck. When the jet pierces the cloud, supercooled water droplets in the cloud suddenly crystallize. This water-to-ice transformation proceeds outward from the point of impact, creating a vast circle of icy wisps--the "hole." But how many jets would it take to create this display? Consider it a beautiful mystery.