The Instrument that Discovered a Planet
Filed under pretty pictures, history, trans-neptunian objects, Pluto, dwarf planets beyond Neptune
The blink comparator used by Clyde Tombaugh in the discovery of Pluto. Tombaugh went on to scan millions of stars with this comparator during the 1930s.
Pretzelpaws via Wikimedia Commons
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Original image data dated on or about August 10, 2005