Coming across an ice disk during a chilly stroll by the lake would most likely freak you out. These natural anomalies are massive, round slabs of ice that slowly rotate like frozen UFOs descending on the surface of an otherwise tranquil river. But there's nothing to fear. The reason these disks spin has been a mystery for a century, but the mystery may have finally been solved.
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Written by Curiosity Staff February 6, 2017
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