- Galilei, Galileo (1564-1642)@
- Learn about Galileo Galilei, the Italian physicist, astronomer, and philosopher regarded as the father of modern physics and astronomy whose achievements include improvements to the telescope, a number of breakthrough astronomical observations, and effective support for Copernicanism. Sites feature biography, his pioneering scientific contributions, the influence of his mathematics on Renaissance art, and his struggles to persuade the Church of the truth behind his discoveries about the cosmos.
- National Space Science Data Center: Neptune
 - Offers fact sheets, data, images, and colour images of Neptune's Great Dark Spot, clouds, and satellites. - Neptune's Ring System
- Includes animations, images, and references.
- Nine Planets: Neptune
- Information on the planet Neptune and its moons, as well as pictures.
- Planet Neptune, The
- Describes the planet's general features, surface, interior, and faint rings.
- Solar System Exploration: Neptune
- Overview, facts, and links about the planet Neptune.
- Views of the Solar System: Neptune
- Planet Neptune statistics, animations, views, and more.
- Welcome to the Planets: Neptune
- Profile and pictures.
- Wikipedia: Neptune (Planet)
- Characteristics and other facts about the planet Neptune.
- Windows to the Universe: Neptune
- Profiles the eighth planet from the Sun.
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