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http://www.solarsystemquick.com/
www.kidsastronomy.com/solar_system.htm
http://www.planetsforkids.org/
http://solarsystem.nasa.gov/kids/
http://www.neok12.com/Solar-System.htm
http://www.skyandtelescope.com/astronomy-resources/stargazing-basics/family-projects-and-experiments/
http://www.exploratorium.edu/ronh/weight/