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
Definition of Planet - Wikipedia
Article describes the history and present controversy surrounding the word and its applicability to various objects.
International Outer Planet Watch
A program to study the time variability of the outer planets.
Provides photographs and information about each planet in the solar system.
Welcome to the Planets
Images from NASA's planetary exploration program.
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Last update:May 5, 2016 at 5:54:11 UTC