This intricate wooden dome at Lowell Observatory outside Flagstaff, Arizona is home to the Clarke 24″ Refractor telescope used by Percival Lowell in his studies of Mars between 1893 and 1908. It was here that he made his controversial drawings of “canals” on the red planet. The observatory is probably even more famous for the work done about 100 yards from here in 1930 when Clyde Tombaugh discovered Pluto using a smaller telescope in one of the other domes at the site.
For the technically inclined...
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