Enough heat to power hydrothermal activity inside Saturn’s ocean moon Enceladus for billions of years could be generated through tidal friction if the moon has a highly porous core, a new study finds, working in favour of the moon as a potentially habitable world.
via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/Cassini-Huygens/Heating_ocean_moon_Enceladus_for_billions_of_years
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