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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.
Smithsonian Institution
National Air and Space Museum: Exploring the Planets: Ancient Times & the Greeks
In ancient times only five planets were known: Mercury, Venus, Mars, Jupiter, and Saturn. Learn about Greek astronomer Ptolemy's theory for the solar system that was to survive for fourteen centuries.