In 1930, amateur astronomer Clyde Tombaugh discovered Pluto using a telescope, photographic plates of the solar system, and a tool called a blink comparator. You can see a blink comparator and Pluto discovery plate on display in the "Kenneth C. Griffin Exploring the Planets Gallery" at the Museum in DC. This video series is made possible by the generous support of Lockheed Martin. | National Air and Space Museum, Smithsonian Institution
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