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Pluto Challenges Scientists, 75 Years Later

NPR | By Sadie Babits

Published February 18, 2005 at 12:00 AM EST

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Seventy-five years ago, astronomer Clyde Tombaugh discovered the planet Pluto at Lowell Observatory in Flagstaff, Ariz. Today, scientists in Flagstaff are still hard at work, researching Pluto's mysteries. Sadie Babits of Arizona Public Radio reports.