American astronomer (1906–1997) best known for discovering Pluto in 1930. Official color 10 x 8 NASA lithograph depicting various celestial features of the solar system, signed in the lower border in blue ballpoint, “Clyde W. Tombaugh. Discovered 9th planet, Pluto, on 18, Feb 1930.” In fine condition, with a trivial crease to upper left corner tip. Pre-certified PSA/DNA.
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