A different scale for globe and ring: Saturn and Rhea.
Two weeks ago the Cassini space probe detected what appeared to be a "red spot" on Saturnine moon Titan, an area on the surface with a unique infrared spectrometer response. Four possibilities were considered: "surface coloration, a mountain range, a cloud, or a hot spot."
Today, NASA is announcing the discovery of a methane-pumping, Titanian ice volcano, observed geologically and thermatically.