A massive hole the size of Lake Superior has opened in the ice that covers Antarctica's Weddell Sea, a phenomenon that hasn't been seen since the mid-1970s. This hole, called a polynya, opens up 80,000 square kilometers (31,000 square miles) of ocean in the middle of the Weddell Sea's ice pack, hundreds of miles from shore. "This is hundreds of kilometers from the ice edge. If we didn't have a satellite, we wouldn't know it was there," explains professor Kent Moore, an atmospheric physicist at the University of Toronto.
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