"From its time of discovery in 1930 to 2006 it was considered to be the ninth planet in the solar system, but because additional objects have been discovered including Eris which is 27% more massive, the IAU reclassified Pluto and the other objects as dwarf planets."
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https://www.youtube.com/watch?v=l91ISfcuzDw
Hey, Fuck You!
http://www.solarviews.com/eng/pluto.htm