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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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It is now believed that Pluto is a dwarf planet, like several others that have been found.
So it was downgraded to dwarf planet status.
In 2006 Pluto was officially downgraded from planet to dwarf planet, causing much controversy in astronomical circles.
After being downgraded from a planet to a dwarf planet last year, it now transpires it is not even the biggest of those.
The dwarf planet will transform from a pixelated blur into a sharp image of rock and ice.
A moon is a natural satellite that orbits a planet or dwarf planet.

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