Exploring the Planets

Early Discovery

Learn what early civilizations knew about our solar system and how astronomy developed over the centuries. The early theories describing the movements of the planets, development of the first telescopes, and discoveries of the planets Uranus, Neptune, and Pluto are some of the topics addressed here. You will find the Pluto discovery plate, the photographic plate taken the day Pluto's position was discovered by Clyde Tombaugh in 1930.