Web Directory

» Astro-Taxonomy: Sizing up the Planets
   Provides a formal definition of a planet, information on planetary classification and cosmogony.
   http://astro-taxonomy.net

» Definition of Planet - Wikipedia
   Article describes the history and present controversy surrounding the word and its applicability to various objects.
   http://en.wikipedia.org/wiki/Definition_of_planet

» International Outer Planet Watch
   A program to study the time variability of the outer planets.
   http://www-ssc.igpp.ucla.edu/IJW/

» Planet Facts
   Provides photographs and information about each planet in the solar system.
   http://www.planetfacts.net

» Planets Formation
   Article from a book by Angel Fernando Vitoria.
   http://www.planetsformation.netii.net/

» Welcome to the Planets
   Images from NASA's planetary exploration program.
   http://pds.jpl.nasa.gov/planets/