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Milton L. HumasonMilton Lasell Humason (August 19 1891 – June 18 1972) was as American astronomer. He was born in Dodge Center, Minnesota. He started out as a janitor at the Mount Wilson Observatory in 1917, but soon became night assistant. As a professional, he became known as a meticulous observer, obtaining photographs and spectrograms. His observations played a major role in the development of cosmology. He retired in 1957. He discovered Comet C/1961 R1 (Humason), notable for its large perihelion distance. Due to merest chance, Humason missed discovering Pluto. Eleven years before Clyde Tombaugh, Humason took a photograph in which the image of Pluto fell on a defect in the photographic plate and was not detected. External links Humason, Milton Humason, Milton Humason, Milton
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