Tombaugh draws the diameters of Earth and Mars to illustrate the planets comparative sizes. Earth's diameter is 7900 miles against Mars diameter of 4215 miles. On his Mars diagram, Tombaugh draws what would seem to be his understanding of the pitted Martian surface. His observations of Mars led him to conclude that Mars had been hit by asteroids causing observable craters due to the planet's proximity to the asteroid belt. The Mariner 4 space probe affirmed his hypotheses. The astronomer best known for identifying Pluto has signed, "Clyde W . Tombaugh" in a bold hand. A fine, visually instructive illustration. The asteroid 1604 Tombaugh discovered in 1931 is named after him. He discovered 14 asteroids, beginning with 2839 Annette in 1929, mostly as a byproduct of his search for Pluto and his further searches for other celestial objects.

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SIGNED OIGINAL ART. Earth and Mars Drawing Signed on 3 x 5 card

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In the field of antiquarian autographs, the Schulson name is recognized for connoisseurship, expertise and commitment to the finest of quality. Schulson Autographs is the continuation of David Schulson Autographs, Ltd., located in Manhattan until 2007 when the company moved to New Jersey. For more than 35 years, our company has offered fine historical autographs in the fields of literature, art, science and medicine, music, classic cinema, history and politics. Claudia Strauss-Schulson, President and owner, continues to bring her knowledge of history and her passion for education to Schulson Autographs. She works successfully with institutions to expand established collections. She works successfully with individuals to build or begin collections and to select the perfect gift. Schulson Autographs is a member of the ABAA, ILAB, PADA, and The Manuscript Society.

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Schulson Autographs
34 Old Short Hills Road, Millburn, NJ, 07041, U.S.A.

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