矮行星
冥王星
Pluto
The Kuiper Belt dwarf planet
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简介
Considered a planet until 2006, Pluto is now classified by the IAU as a dwarf planet. In 2015 the New Horizons probe revealed plains of nitrogen ice, water-ice mountains and a thin atmosphere.
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The large bright heart-shaped region is called Tombaugh Regio, after its discoverer.