Science

What's pluto a planet?


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In 2006 the International Astronomical Union (IAU) defined planets with Resolution 5A-a, Orbits the Sun, b, a nearly round shape, c, has cleared the neighborhood around its orbit. Resolution 6A defines Pluto as a Dwarf Planet, since it has not cleared its neighborhood (5A-c).

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Pluto is a dwarf planet. In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of "dwarf planet."

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