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  • Pluto and Lowell Observatory

    A History of Discovery at Flagstaff

    Series series Landmarks
    Pluto looms large in Flagstaff, where residents and businesses alike take pride in their community's most enduring claim to fame: Clyde Tombaugh's 1930 discovery of Pluto at Lowell Observatory. Percival Lowell began searching for his theoretical "Planet X" in 1905, and Tombaugh's "eureka!" experience brought worldwide attention to the city and observatory. Ever since, area scientists have played ... Read more

    $12.99 USD or Free with Kobo Plus