Enceladus imaged by Cassini on 14 July 2005. Note the contrast between the cratered surface near the north pole and the smooth ice covering the south pole
NASA/JPL/USGS
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By analysing its infrared radiation using Wien’s law, the Cassini space mission has mapped the surface temperature of Enceladus, one of the most intriguing objects in the Solar System. Erupting geysers keep parts of the surface crater-free, and material ejected faster than the escape velocity moves through the moon’s gravitational field to join Saturn’s rings.
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