One of the most bizarre weather patterns in the solar system has been photographed at Saturn, where astronomers have spotted a huge, six-sided feature circling the north pole.
Rather than the normally sinuous cloud structures seen on all planets that have atmospheres, this thing is a hexagon.
The honeycomb feature has been seen before. NASA's Voyager 1 and 2 spacecraft imaged it more than two decades ago. Now, having spotted it with the Cassini spacecraft, scientists conclude it is a long-lasting oddity.
The hexagon is nearly 15,000 miles (25,000 kilometers) across. Nearly four Earths could fit inside it. The thermal imagery shows that the hexagon extends about 60 miles (100 kilometers) down into the clouds.
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