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Pluto Challenges Scientists, 75 Years Later

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.

Copyright 2005 NPR

Sadie Babits