http://solarsystem.nasa.gov/planets/profile.cfm?Object=Dwarf&Display=OverviewLong
http://solarsystem.nasa.gov/planets/profile.cfm?Object=Pluto&Display=Kids
http://en.wikipedia.org/wiki/Eris_(dwarf_planet)
http://news.bbc.co.uk/2/hi/science/nature/6037844.stm
http://www.msnbc.msn.com/id/14489259/
http://en.wikipedia.org/wiki/Ceres_(dwarf_planet)
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