Pluto's Spinning Moons

Pluto’s Spinning Moons

Pluto's Spinning Moons

Most inner moons in the solar system keep one face pointed toward their central planet, much like our own moon. This is called gravitational locking, or tidal locking. The gif above shows that certainly isn’t the case with the small moons of Pluto, which behave like spinning tops. Pluto is shown at center with, in order, from smaller to wider orbit: Charon (which you can see is actually tidally locked), Styx, Nix, Kerberos, and Hydra (which all spin).

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