The Cassini spacecraft, which is is finishing operations at Saturn next year, has been watching the north pole of the planet closely since the sun illuminated the region in late 2012. This 2013 image shows just how complex the hexagonal-shaped storm system at Saturn's north pole is. They have seen a lot of small haze particles and few big haze particles inside the storm, which is the opposite of what is seen outside of the hexagon. The weather feature itself is unique in the solar system and is huge: 20,000 miles (30,000 kilometers) across with 200 mph (322 km/hr) winds. "The hexagon is just a current of air, and weather features out there that share similarities to this are notoriously turbulent and unstable," said Andrew Ingersoll, a Cassini imaging team member at the California Institute of Technology, in a 2013 statement. "A hurricane on Earth typically lasts a week, but this has been here for decades -- and who knows -- maybe centuries."
Image: The hexagon on Saturn's north pole. Credit: NASA/JPL-Caltech/SSI/Hampton University