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Observatorium Lowell est observatorium astronomicum in urbe Flagstaff Arizonae situm, anno 1894 conditum a Parcivallo Lowell, unum ex veterrimis observatoriis Civitatum Foederatarum, anno 1965 monumentum historicum nationale (National Historic Landmark) designatum. In hoc observatorio Clyde Tombaugh anno 1930 planetula Plutonem invenit.
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