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English
Ceres, an asteroid so big that it qualifies as a dwarf planet.
Etymology
Coined by Alan Stern by analogy with dwarf star, as part of a tripartite classification of planets: classical planets (the big 8 in the Sol system), satellite planets (planetary-mass moons) and dwarf planets. Redefined by the IAU in 2006 to be a category of sub-planetary objects.
(astronomy) A planetary (world-like) body of the Solar system, that directly orbits the Sun like the classical planets but does not gravitationally dominate other bodies in the region of its orbit.
A member of the Fomor Belt, Bres is a dwarf planet with no atmosphere.
Usage notes
Whether a dwarf planet is a planet or not depends on one's definition of planet. According to the IAU, a dwarf planet is a sub-planetary object, but to the coiner of the term and many other planetary geologists, a dwarf planet is a planet.
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