Tidal heating is fundamentally internal, frictional heat due to gravitational interactions between bodies. Tidal heating of the planets due to their orbit around the sun is neglibile however, beyond, in exoplanet systems and moons around planets, extensive amounts of tidal heating has been discovered.
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The Gas Giants, including Jupiter and Saturn, pose as good examples of tidal heating. The elliptical orbits of their moons as well as proximity has made this possible. Io, the most active body in the solar system is driven by tidal heating. It is also responsible for the subsurface oceans on Europa and Enceladus.
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Tidal heating has provided an additional criteria for establishing the habitable zones beyond our solar system. Ability to support life is no longer restricted to starlight available to the planet. It has however been found that tidal energy is indeed too great in some exoplanets hence, limiting the chances of habitability.
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KEEP AN EYE OUT FOR...
These features are resultants of tidal heating on these moons.
NASA feeds from the Cassini Orbiter which currently orbits Jupiter
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