In Depth | Pluto – NASA Solar System Exploration
https://solarsystem.nasa.gov/planets/dwarf-planets/pluto/in-depth.amp
WEBPluto is a complex and mysterious world with mountains, valleys, plains, craters, and maybe glaciers. Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery of similar intriguing worlds deeper in the distant Kuiper Belt, icy Pluto was reclassified as a dwarf planet.
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