aug 1, 2006 - Pluto: Dwarf Planet
Description:
A dwarf planet, Eris, that was 27% bigger than Pluto was discovered in 2005. The International Astronomical Union had to redefine what it meant to be a planet in 2006. At their 26th General Assembly, Pluto was reclassified as a dwarf planet.
Added to timeline:
It's About Time
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