SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Illustration of Pluto, a dwarf planet, and it's 5 known moons: (clockwise from center right) Charon (the largest, with a diameter just over half that of Pluto), Hydra, Styx, Nix, and Kerberos. Pluto is the most distant planet of the solar system, circling the Sun at a distance of around 6 billion kilometres every 248 years.
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