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Prehistoric
Possibly cavemen discover Mercury, Venus, Mars, Jupiter, Saturn, and Luna.
1781 March 13
William Herschel discovers Uranus.
1801 January 1
Ceres is discovered and is thought to be a planet. Later on it is decided that it's just to small.
1846 September 23
Johanne Galle discovers Neptune.
1930 February 18
Clyde Tombaugh discovers Pluto.
2002
Quaoar is found.
2003
Sedna is found.
2005 July 9
Eris is found.