Scientists have solved the mystery of how a gaping hole nearly twice the size of that formed in Antarctica's sea ice eight years ago.The rare opening of ice free water, called a , was first discovered in 1974 and remained for the following two years until the void eventually closed. in 2016 and 2017 when the polynya reappeared because of its vast size and distance from the coast - setting them on a hunt to uncover what was forming the hole.
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