This image shows a ring of auroral lights glowing above the South Pole of Saturn. The aurora, shown here in blue, was actually photographed in ultraviolet "light". This image, captured by the Hubble Space Telescope in 2004, is a composite of the UV auroral image combined with a visual light image of the rest of Saturn.
Image courtesy of NASA, ESA, J. Clarke (Boston University), and Z. Levay (STScI).