Researchers report a model of volcanic fissures on Saturn's moon Enceladus in which the fissures connect a subsurface ocean to the moon's icy surface and tidal forces drive water flow into and out of the fissures, generating heat that prevents the fissures from icing over, and in which feedback between tectonic and volcanic activity sustains average power output at the observed value of 5 gigawatts over millions of years.
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