Solar System By aboos12 Jan 7, 1610 Jupiter Jupiter was discovered May 16, 1610 Saturn and Mercury Mercury and Saturn Mar 13, 1781 Uranus Uranus was discovered Sep 1, 1807 Asteroids Asteroids were discovered Feb 18, 1930 Pluto Pluto was discovered Jul 14, 1965 Mars Mars was discovered May 18, 1996 Comet Comets were discovered