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Dwarf planet

In 2009 Pluto's catigorization was changed from 'Planet' to 'Dwarf Planet'.


Official definition for the term "planet"

  1. The object must be in orbit around the Sun.
  2. The object must be massive enough to be rounded by its own gravity. More specifically, its own gravity should pull it into a shape of hydrostatic equilibrium.
  3. It must have cleared the neighborhood around its orbit.

Pluto's Moons

NameDiameter (km)Discovery Date
Nix51 × 41 × 3615/06/2005
Hydra55 × 4015/06/2005
Kerberos12 × 4.528/06/2011
Styx7 x 526/06/2012

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