Neptune

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Astronomy 161: Neptune - General features and some pictures.
Encarta Encyclopedia: Neptune - Information on the planet Neptune.
Exploring the Planets: Neptune - Information and photographs on the moons, atmosphere, and rings of planet Neptune
Mathematical Discovery of Neptune - Another interesting history on how planets can be discovered mathematically.
Neptune - Pictures, statistics, and detailed information on planet Neptune.
Neptune114 - Its atmosphere, rings, moons, appearance, and links to related sites.
NSSDC Photo Gallery: Neptune - Select images of the planet, with brief captions.
Royal Greenwich Observatory: Neptune - Basic overview.
Views of the Solar System: Neptune - Views, animations, general information and data of the planet.
Welcome to the Planets: Neptune - Planetary profile and vital statistics.
Windows to the Universe: Neptune - Overview of several aspects of the planet. Versions available for beginner, intermediate and advanced level users.