A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
- In 2006 Pluto was officially downgraded from planet to dwarf planet, causing much controversy in astronomical circles.
- 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.
- Ceres and Xena will also be considered dwarf planets.
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