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When was pluto is not a part of eight planets? Date and why?
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When was pluto is not a part of eight planets? Date and why? Related: ...
In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of “dwarf planet.” 
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because:
It's smaller than any other planet -- even smaller than Earth's moon.

It's dense and rocky, like the terrestrial planets (Mercury, Venus, Earth and Mars). ...

Pluto's orbit is erratic. ...

One of its moons, Charon, is about half Pluto's size.
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When was pluto is not a part of eight planets? Date and why? Related: ...
In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of “dwarf planet.”
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When was pluto is not a part of eight planets? Date and why? Related: THE SOLAR SYSTEM?
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