http://pds.jpl.nasa.gov/planets/

http://www.nineplanets.org/

http://en.wikipedia.org/wiki/The_Planets

http://www.enchantedlearning.com/subjects/astronomy/planets/

http://www.space.com/planets/

http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/planets.html

http://www.nasa.gov/worldbook/planet_worldbook.html

http://www.factmonster.com/ipka/A0769141.html

http://solarsystem.nasa.gov/planets/index.cfm

http://www.frontiernet.net/~kidpower/planets.html