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Pluto's moon Charon may have once spun once every 14 hours, and its ancient mountains still record how it slowed down

For decades, Charon was often viewed as the quieter half of the Pluto system, a frozen world marked by craters, fractures and vast plains. Yet the surface photographed by NASA’s New Horizons ...
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Pluto: Observing chaos at solar system’s outer limits

The study, carried out by Mark R. Showalter of the SETI Institute and Doug Hamilton based at the University of Maryland, reveals that at least two of Pluto’s moons do not have an orderly rotation on ...