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What is a dwarf planet?

What is a dwarf planet? Here are some definitions.

Noun
  1. (astronomy) Any astronomical body which has achieved hydrostatic equilibrium (which is the shape a body of water would take, as opposed to a small Solar System body), orbits the Sun (as opposed to a moon), and has not "cleared its neighbourhood" of competing bodies (as opposed to a planet).
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After being downgraded from a planet to a dwarf planet last year, it now transpires it is not even the biggest of those.
In 2006 Pluto was officially downgraded from planet to dwarf planet, causing much controversy in astronomical circles.
The Dawn rocket probe will visit Vesta and the dwarf planet Ceres.
A paper in the journal Science has further relegated poor Pluto's status by proving that twin dwarf planet Eris is 27 per cent larger.
Charon, largest moon of the dwarf planet Pluto.
A moon is a natural satellite that orbits a planet or dwarf planet.

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