In 1930, astronomer Clyde Tombaugh discovered Pluto from an observatory in Flagstaff, Arizona. Though demoted to a dwarf planet in 2006, Pluto is now the star of a year-long celebration.(Photo : NASA/JHU APL/SwRI/Steve Gribben)
In 1930, astronomer Clyde Tombaugh discovered Pluto from an observatory in Flagstaff, Arizona. Though demoted to a dwarf planet in 2006, Pluto is now the star of a year-long celebration.
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