Planets, as the term is used for this category, are the eight solar system bodies which meet the International Astronomical Union definition of the word as described in http://www.iau.org/fileadmin/content/pdfs/Resolution_GA26-5-6.pdf
Article describes the history and present controversy surrounding the word and its applicability to various objects.
A program to study the time variability of the outer planets.
Provides photographs and information about each planet in the solar system.
Images from NASA's planetary exploration program.
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