Tidal Heating

Tidal Heating
   This is the heating of a satellite's interior caused by gravity induced friction.
   As the satellite rotates around a planet, and possibly passes other satellites, the gravity pulls from different angles and changes the planets shape into a slight oval. This pulling causes friction which generates heat. A satellite could have a frozen surface but a liquid interior, like Europa and Ganymede, moons of Jupiter, probably have.

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