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Comment Re:photo too blurry (Score 2) 78

Tidal dissipation occurs when the tidal forces vary with time, generally due to the orbit of the secondary being eccentric. That brings it alternately closer to and farther from the primary, stretching and squeezing the interior.

However, the orbit of Charon about Pluto is circular (Buie et al., 2012), so the tidal bulge is constant. There's no time-varying deformation and no dissipation.

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