आखिर Pluto को एक planet क्यों नहीं माना जाता?|Why pluto is not considered as a planet? HD

आखिर Pluto को एक planet क्यों नहीं माना जाता?|Why pluto is not considered as a planet?| Pluto का सच Pluto is dwarf planet but before 2005 we concider the plu...