This true color image captured by NASA'S Cassini spacecraft before a distant flyby of Saturn's moon Titan on June 27, 2012, shows a south polar vortex, or a mass of swirling gas around the pole in the atmosphere of the moon. | NASA/JPL-Caltech/Space Science Institute

Mysterious Polar Vortex Observed on Titan, Saturn's Largest Moon

A rapid cooling of Titan’s southern hemisphere in 2012 is unique in the solar system, and occurred because of the moon’s exotic atmospheric chemistry.