1. The Solar System The Sun and the Celestial Bodies

2. Sun Typical medium-sized star Radiation produced by nuclear fusion

3. Solar System Ten planets and their satellites Asteroids Comets Meteoroids Interplanetary dust & gas

4. Major Planets Inner planets –Mercury, Venus, Earth and Mars Outer Planets –Jupiter, Saturn, Uranus, Neptune, Pluto, and Quaoar

5. Major Planets Inner planets –small, rock and iron Outer Planets –mainly hydrogen, helium and ice (Pluto*)

6. Movement of Planets Elliptical orbits around the sun Counterclockwise direction around the sun

7. Discoveries of the Planets Mercury – Unknown Venus – Unknown Mars – Unknown Jupiter – Unknown Saturn – Unknown Uranus – 1781 Neptune – 1846 Pluto – 1930 Quaoar - 2002

8. Quaoar, The Newest Planet Identified on June 4, 2002 800 miles in diameter Almost perfectly circular 285-year orbit About 6.3 billion km (4 billion miles) from the sun Known by astronomers as 2002LM60

9. Origin Debate continues!