Most inner moons in the solar system keep one face pointed toward their central planet, but this animation by NASA shows that is not 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, Styx, Nix, Kerberos, Hydra.
Bill Condie is a science journalist based in Adelaide, Australia.
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