Pluto used to be classed as a planet but in 2006 some scientists discovered that it was actually a dwarf planet ( a dwarf planet is a celestial body that us neither a satellite or a planet….)
Neil de Grasse Tyson has a good book on this. Many were very unhappy about the demotion of Pluto, but that is the way science is – do not get too attached to your own ideas or pet theories as data wil lcome in to upset you!
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