A temperature map of Saturn's moon Enceladus, produced by the Composite Infrared Spectrometer on the NASA/ESA/ASI spacecraft.
Based on data from previous fly-bys, the south pole should be very cold, as shown in the left panel. The right-hand panel shows a global temperature image made from measurements of radiation at wavelengths between 9 and 16.5 micrometre. The south pole is 15 Kelvin warmer than expected.
Cassini made the observation from a distance of 84 000 kilometres on the approach to Enceladus, and the image shows details as small as 25 kilometres across.