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Smithsonian Institution
National Air and Space Museum: Exploring the Planets: Early Discovery
This section of the exhibition gives the history of the discovery and study of space starting with the Greeks and Romans through to the early 1900's.
NASA
Nasa: The Space Place: Keck Interferometer
This site from the National Aeronautics and Space Administration provides the opportunity to solve a crossword and learn about the world's biggest telescopes.
Cool Math
Coolmath: Science Monster: Introduction to Our Solar System
Find out about all the planets and other solar system characteristics in this colorful, illustrated tutorial on our neighborhood in space.