9 Planets (10 planets?)

• Mercury was used to confirm Einstein's general theory of relativity (1914)
• Mercury could have ice at its poles (1992)

• Venus is geologically active (1994)

• Earth has a companion asteroid Cruithne (1997)
• Earth has another companion 2002 AA29 (2002)

• Mars may have recently had water (2000)
• There are currently 6 spacecraft orbiting Mars (2004)

• Jupiter's moon Io has volcanoes (1979)
• Jupiter has faint rings like Saturn (1997)
• Jupiter has 17 moons (1999)
• Jupiter's moon Europa may have liquid water (2000)
• Jupiter has 63 moons (2003)

• Saturn's moon Titan has an atmosphere (1944)
• Saturn has 18 moons (1990)
• Saturn has 37 moons (2005)
• Saturn's moon Enceladus has an atmosphere (2005)
• Saturn has 46 moons (2005)

• Uranus has faint rings like Saturn (1977)
• Uranus has 27 moons (2003)

• Neptune has faint rings like Saturn (1989)
• Neptune has 8 moons (1989)
• Neptune has 13 moons (2003)

• Pluto has traveled on only about one-quarter of its orbital path around the Sun since its discovery in 1930
• Pluto has a moon (1978)
• Pluto has three moons (2005)

• Xena is 1.5 the size of Pluto (2005)
• Xena has a moon (2005)

• 2001 KX76, at 1200 km, may be half the size of Pluto (2001)
• Quaoar may have a diameter of 1250 km (2002)
• Sedna orbits the Sun once every 10,500 years and may have a diameter of 1800 km (2003)
• Quaor may have volcanic activity (2004)
• more discoveries (2005)

If the Sun were the size of a bowling ball, then Pluto would be 10 football fields away

Other Nine Planets site

Natural satellite discovery site