![]() How such a small, cold world can sustain so much geological activity has been an enduring scientific puzzle. The moon is covered in ice 20-30 kilometers (12.4-18.6 miles) thick, and the surface temperature is about -201 Celsius (-330 Fahrenheit), but a decade of data from NASA's Cassini–Huygens mission supplied evidence for a deep liquid ocean inside the icy shell, escaping into space through continuous "cryo-volcanism". Enceladus has a diameter of about 504 kilometers (313 miles)-roughly the length of the United Kingdom at its longest point. ![]()
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