Io, a tidally heated moon orbiting Jupiter, has volcanoes powered by tidal forces. They originated on tidally locked planets around red dwarf suns. This is so close that any habitable planets would be tidally locked. The eccentricity of its orbit means that it avoids becoming tidally locked. Its orbit will then shrink more rapidly as it is tidally circularized. This results in Pluto and Charon being mutually tidally locked. Kepler-452b is most likely not tidally locked, and has a circular orbit. The exoplanet is close enough to its host star that it might be tidally locked. Weather studies show that tidally locked planets may still have the ability to support life. Thus in astronomical timescales, the moon became tidally locked very fast. The planet is likely to be tidally locked. Charon are both tidally locked to each other. The planet is thought to be tidally locked to its star. A third possibility is where the primary and moon are tidally locked to each other. The tidally dissipated power in a nonsynchronised rotator is given by a more complex expression.