| 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 |
| John Couch Adams and Neptune: The History of its discovery. |
| 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. |
Classical
