Saturn's North Pole - The Eternal Storm

Roiling storm clouds and a swirling vortex at the center of Saturn's famed north polar hexagon is seen in an image from NASA's Cassini mission taken November 27, 2012. The camera was pointing toward Saturn from approximately 224,618 miles (361,488 kilometers) away. REUTERS/NASA/JPL-Caltech/Space Science Institute/Handout

This image from NASA's Cassini mission was taken on Nov. 27, 2012, with Cassini's narrow-angle imaging camera. The camera was pointing toward Saturn from approximately 248,578 miles (400,048 kilometers) away. (NASA/JPL-Caltech/Space Science Institute)

Saturn's mysterious northern vortex, a vast hexagon-shaped storm, dominates this photo taken Nov. 27, 2012, by NASA's Cassini spacecraft. This image is a raw and unprocessed view. (NASA/JPL-Caltech/Space Science Institute)

The south polar vortex of Saturn's moon Titan stands out in this natural-color view from NASA's Cassini spacecraft, snapped on July 25, 2012.

 The Cassini spacecraft was pointing toward Dione at approximately 8,416 kilometers away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated.

NASA's Cassini spacecraft has been studying Saturn and its moons since it entered orbit in 2004. This image, taken on Oct. 5, 2008, is a stunning mosaic of the geologically active Enceladus after a Cassini flyby.